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Tektronix 1740A Series Service Manual

Tektronix 1740A Series Service Manual

Waveform/vector monitors

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Service Manual

1740A Series, 1750A Series, & 1760 Series

Waveform/Vector Monitors

S/N B020000 and Above

070-8469-03

This document applies to firmware version 2.00

and above.

Warning

The servicing instructions are for use by qualified

personnel only. To avoid personal injury, do not

perform any servicing unless you are qualified to

do so. Refer to all safety summaries prior to

performing service.

www.tektronix.com

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Page 1 Service Manual 1740A Series, 1750A Series, & 1760 Series Waveform/Vector Monitors S/N B020000 and Above 070-8469-03 This document applies to firmware version 2.00 and above. Warning The servicing instructions are for use by qualified personnel only. To avoid personal injury, do not perform any servicing unless you are qualified to do so.
Page 2 Copyright © Tektronix, Inc. All rights reserved. Tektronix products are covered by U.S. and foreign patents, issued and pending. Information in this publication supercedes that in all previously published material. Specifications and price change privileges reserved. Tektronix, Inc., P.O. Box 500, Beaverton, OR 97077...
Page 3 Tektronix, with shipping charges prepaid. Tektronix shall pay for the return of the product to Customer if the shipment is to a location within the country in which the Tektronix service center is located. Customer shall be responsible for paying all shipping charges, duties, taxes, and any other charges for products returned to any other locations.
Page 5 ........3- - 16 Diagram <10> Remote & 1760 Series / XROM Bus Connectors ... 3- - 16 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 6: Table Of Contents
........... . 6- - 27 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 7 ......10- - 1 Glossary Index 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 8 ......5- -5 Figure 5- -3: Audio and Timecode Cable Adapter ....5- -6 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 9 ....... . . 10- -11 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 10 Table 6- -5: Shut down logic levels ......6- -9 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 11 Table 7- -1: Power cord identification ......7- -2 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 12 Table of Contents viii 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 13 Symbols and Terms Terms in this Manual. These terms may appear in this manual: WARNING. Warning statements identify conditions or practices that could result in injury or loss of life. 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 14 CAUTION indicates a hazard to property including the product. Symbols on the Product. The following symbols may appear on the product: CAUTION WARNING Protective Ground Refer to Manual High Voltage (Earth) Terminal 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 15 To avoid electric shock, do not touch exposed connections. X-Radiation. To avoid x-radiation exposure, do not modify or otherwise alter the high-voltage circuitry or the CRT enclosure. X-ray emissions generated within this product have been sufficiently shielded. 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 16 Service Safety Summary 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 17 In all cases, the operating software must be Version 2.2 or above to perform the Readjustment Procedure. The specifications contained in the Specification section of this manual contain Performance Verification step numbers. xiii 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 18 This phone number is toll free in North America. After office hours, please leave a voice mail message. Outside North America, contact a Tektronix sales office or distributor; see the Tektronix web site for a list of offices. 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 19 Most circuitry and the mechanical components are shared throughout the series. In addition to NTSC and PAL standard versions, a dual standard (NTSC/PAL) version is available. 1- 1 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 20 The 1760 Series combines component measurements with the composite capabilities of the 1740A/1750A Series. It incorporates all of the measurements of the 1740A Series with a full set of component analog measurements. The assignable cursors, along with the CRT readout can be used for time, voltage, and phase measurements.
Page 21: Table 1- 1: Waveform Vertical Deflection
±4% to 10 MHz (X5 and X10 Gain), on screen signal (0.2 V or 0.1 V) Leveled Sinewave Generator All inputs AC or DC coupling Performance Verification Procedure Step 1- 3 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 22 Leveled Sinewave Generator and Peak-to-Peak Detector. ±3% to 6 MHz Req: Pix Out Frequency Response A leveled sinewave generator with the output terminated in 75 Ω. ≤1% Pix Out Differential Gain 1- 4 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 23 Req: ≤ Blanking Shift with Presence and Absence of 1 IRE (7 mV PAL) Burst Performance Verification Procedure Step Typically 3 mV Burst on test signal turned off and on. 1- 5 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 24: Table 1- 2: External Reference
Any portion of the synchronized sweep can be positioned on screen in all sweep modes. Performance Verification Procedure Step Color bar signal from serial digital generator in magnified 2- -line sweep. 1- 6 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 25: Table 1- 4: Measurement Cursors
Peak-to-peak ACsignal not to exceed 12 V. Sweep Repetition Rate: Field or line rate of displayed video or external sync signal as selected by the front-panel sweep selection Performance Verification Procedure Step 1- 7 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 26: Table 1- 6: Calibrator
Bursts set to targets) Performance Verification Procedure Step ±50 Hz Req: Subcarrier Regenerator Pull-in Range (AUD) NTSC: ±10 Hz PAL: Performance Verification Procedure Step ≤2 seconds Subcarrier Regenerator Pull-in Time 1- 8 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 27: Table 1- 8: Audio Mode
Measured with 140 IRE (1 V) linearity signal (5- -step, 10- -step, or ramp) with 40 IRE (300 mV) subcarrier. Table 1- 8: Audio mode Characteristic Description Input DC coupled, differential input 20 k Ω Input Impedance 1- 9 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 28: Table 1- 9: Time Code
Applies over a temperature range of 0 - - 50° C Calibrated at 25°C. ±3 dB input amplitude. Typically ≤5° with±6 dB input amplitude Performance Verification Procedure Step Relative Accuracy 2° 1- 10 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 29 Stable display with Video to External Reference timing ±70° (Color frame correctly identified when applied external reference Color Frame Range signal is ≤70° of 0° SCH.) Performance Verification Procedure Step 1- 11 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 30: Table 1- 11: Component Vector Mode (1760 Series Only)
Ch A1 or B1 is displayed vertically. Ch A2 or B2 is displayed horizontally on top half of display. Ch A3 or B3 is displayed horizontally on bottom half of display. 1- 12 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 31: Table 1- 13: Bowtie Mode (1760 Series Only)
Performance Verification Procedure Step Component generator used to measure transcoder accuracy must have an accuracy of ≤±1%. Nominally 75 Ω . Back porch clamped to 0V GBR Output Impedance 1- 13 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 32: Table 1- 15: Crt Display
5 minutes at 25 - - 55 Hz with 0.020 inch displacement Military Specification: Mil- -T- -28800D, Paragraph 1.2.2, Class 3 Req: Mechanical Shock Non Operating: 50 g’s 1/2 sine, 11 ms duration 3 shocks per surface (18 total) 1- 14 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 33: Table 1- 18: Physical Characteristics
Height: 5 1/4 inches (133.4 millimeters) Width: 8 1/2 inches (215.9 millimeters) Depth: 18 1/8 inches (460.4 millimeters) Req: Weight Net: 8 pounds (3.8 kilograms) 15.7 pounds (7.2 kilograms) approximate Shipping: 1- 15 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 34: Table 1- 19: Certifications And Compliances
Testing Laboratory Listing Canadian Certification CAN/CSA C22.2 No. 1010.1 Safety requirements for electrical equipment for measurement, control, and laboratory use. This product complies when installed into any of the following Tektronix instrument enclosures: 1700F00 Standard Cabinet 1700F02 Portable Cabinet WFM7F05 Rack Adapter Use only high-quality shielded cables.
Page 35 Pollution that generates persistent conductivity through conductive dust, rain, or snow. Typical outdoor locations. Equipment type Test and Measurement Safety Class Class I Overvoltage Category CAT II Pollution Degree Pollution Degree 2 1- 17 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 36 Specifications 1- 18 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 37 This procedure works in conjunction with the Adjustment Procedures section of this manual. Version 2.2 or higher software must be loaded in the instrument to use the Adjustment procedures. 2- 1 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 38: Figure 2- 1: Dimensions Of The 1700F00 Plain Cabinet
Also available are the 1700F02 Portable carrying case and the WFM7F05 side-by-side rack mount assembly. All of these cabinets are available from Tektronix. If you need one of these cabinets, contact your nearest Tektronix field office or representative for assistance in ordering.
Page 39: Figure 2- 2: 1700F02 Portable Cabinet
1700F00. The 1700F00, 1700F02, and WFM7F05 cabinets, which are available from Tektronix as optional accessories, provide the proper electrical environment for the instrument. They supply adequate shielding, minimize handling damage, and reduce dust accumulation within the instrument.
Page 40: Figure 2- 3: Rear View Showing The Securing Screws
When working with instruments that are not enclosed in a chassis, you must observe static precautions. You must also be careful not to damage circuit board mounted components or interconnection wiring when sliding a sleeve over these products. 2- 4 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 41: Figure 2- 4: The Wfm7F05 Side-By-Side Rack Adapter
The rack adapter is adjustable, so the instrument can be more closely aligned with other equipment in the rack. See Figure 2- -4. WFM7F05 1700F06 Figure 2- 5: A WFM7F05 with a blank front panel (1700F06) 2- 5 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 42: Figure 2- 6: Wfm7F05 Rack Mount Cabinet With A 1700F07 Utility Drawer
(1700F07) can be installed in the blank side of the cabinet. See Figure 2- -6. WFM7F05 1700F07 Figure 2- 6: WFM7F05 rack mount cabinet with a 1700F07 utility drawer 2- 6 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 43: Figure 2- 7: Custom Installation Of An Instrument
Cut hole in panel the same size as the opening in the monitor cabinet to allow the front panel molding to cover the hole. Figure 2- 7: Custom installation of an instrument 2- 7 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 44 Table 7- -1 in the Options section shows the available options. Operational Changes No operational modifications are made to this monitor through internal jumper settings. 2- 8 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 45: Figure 2- 8: Rear Panel Connectors
The external reference input provides both external synchronizing signals and (EXT REF) external subcarrier input to these instruments. Input is either black burst or composite video. It is a 75 Ω compensated loop-through input, requiring external termination. 2- 9 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 46: Figure 2- 9: Rear Panel Remote Connector
Eight front-panel setups can also be stored and recalled through the Remote connector. Table 2- -1 shows pin assignments and Figure 2- -9 shows the connector. REMOTE Figure 2- 9: Rear panel REMOTE connector. 2- 10 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 47 Preset 7 Ground (TTL low) Ground pin 23 to recall setup from preset 7. Ground pins 23 and 25 to select preset 7 as storage location for current setup. 2- 11 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 48: Table 2- -1: Remote Connector
REMOTE connector RGB INPUT RGB ENABLE* REMOTE SYNC IN GROUND REMOTE SYNC ENABLE *(Do not connect when replacing Option 16 instruments.) Figure 2- 10: Replacement adapter for 1740/1750 2- 12 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 49: Figure 2- 11: Rear Panel Rs232 Connector
Receive Data (RxD) Request to Send (RTS) Transmit Data (TxD) Clear to Send (CTS) Data Terminal Ready (DTR) No connection Signal Ground (GND) RS232 Figure 2- 11: Rear panel RS232 connector 2- 13 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 50 Software Disk The software disk is a 3.5” (1.44MB) high-density disk. It contains all programs necessary to upgrade or reload the operating software in the Tektronix 1740A/1750A/1760- -Series instruments. If a disk drive other than 3.5” is to be used, copy the contents of the disk to the desired size disk or to a hard disk directory.
Page 51 The instrument cannot be used during execution of any of the programs on this disk. If the operation of any of these programs is interrupted, that program must be rerun from the beginning to ensure a proper upgrade. 2- 15 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 52: Figure 2- -12: Standard And Alternate Hookups For The 9-Pin
No connection Standard hookup 9-Pin female 9-Pin male connector to connector to PC 1740A/1750A/1760-Series Signal ground Alternate hookup Figure 2- 12: Standard and alternate hookups for the 9-pin connector 2- 16 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 53: Figure 2- 13: Standard And Alternate Hookups For 25-Pin Pc Connector
Signal ground Standard hookup 9-Pin male connector to 25-Pin female 1740A/1750A/1760-Series connector to PC Signal ground Alternate hookup Figure 2- 13: Standard and alternate hookups for 25-Pin PC Connector 2- 17 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 54 POWER switch is set to STANDBY. b. Move the plug jumper on J4 (Main board) to pins 1 and 2 (the pins closest to U14). 2- 18 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 55 Wait for the message that the program execution is completed. d. Verify that step 4f has been performed. e. This completes the Software Upgrade Procedure. 2- 19 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 56 3. Type in the number of the COM PORT, but do not press RETURN. 4. Turn the 1740A/1750A/1760-Series front-panel POWER switch to ON. 5. Within 6 seconds, press RETURN on the PC. 2- 20 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 57 1 and automatically displays the results in a parade format; when “A123” is selected, the A1 minus A2 waveform is shown to the left of the A1 minus A3 waveform. This lets you use the Tektronix-developed Bowtie test signal to check and adjust inter-channel timing on component systems.
Page 58: Figure 2- 14: 1760 Front Panel
6. Use the front panel controls (Figure 2- -14) to observe and measure the desired signals. For more details, see the following pages or the user manual. 2- 22 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 59 (with the menu LED remaining lighted to show this state). To reinstate a menu display, press that menu button again. CRT, PRESET, and CONFIG menus are exited completely when another menu button is pressed. 2- 23 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 60 (LED is lighted), press the menu button to bring back the full display, then press it again to exit the menu. 2- 24 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 61: Table 2- 2: The Available Display Modes
The SCH phase of the reference signal is separately sensed to allow reliable color framing comparison. Using this method of determining relative color framing 2- 25 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 62 The PICTURE mode allows the operator to verify the signal source. In PIC- TURE mode with LINE SELECT on, a bright-up marker identifies the selected line in the picture. 2- 26 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 63 If both A123 and B123 are selected, the display will consist of a side-by-side display of channels A1, A2, and A3, overlaid with a side-by-side display of channels B1, B2, and B3. 2- 27 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 64 H One line magnified = 200 ns/division H Two line magnified = 1 µs/division H One field or two field magnified = approximately 20 magnification. 2- 28 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 65 Block Diagram Description The 1740A Series of monitors provides the typical composite displays used to monitor video quality. The 1750A Series adds SCH phase measurements. The 1760 Series provides both composite and component analog capabilities. Option SC added to the 1760 Series provides SCH phase measurements.
Page 66 An additional internal amplifier stage provides a chrominance differential output to drive the vector chroma amplifier. Gain of the chrominance signal is con- trolled by the microprocessor. 3- 2 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 67 Phase Detector output. It is also checked for phase lock and, if unlocked, an output is supplied to the Error Amplifier to increase its bandwidth for faster locking. 3- 3 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 68 Color Difference to GBR Transcoder. Either a GBR input signal or the transcoded color difference signal can be buffered to drive the back porch Outputs clamped GBR Output Amplifiers. GBR outputs are compensated in 75Ω. (1760 Series only) 3- 4 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 69 Two sync separators time the line rate controller. One strips sync from the internal video signal, while the second strips sync from the external reference video. Two separators are required to support color field identification (SCH). 3- 5 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 70 Calibrates the instrument. Consists of a 9-pin connector and a line driver. Remote The Remote input consists of a 25-pin connector and parallel in/serial out registers to provide an external interface for remote control of the instrument. 3- 6 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 71 75Ω environment. Q18 is an emitter-follower to provide the high input impedance. CR1 and CR2 prevent the power supply impedance from affecting the return loss characteristics of the loop-through input when the power supply is turned off. 3- 7 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 72 The PAL filter is centered on 4.43 MHz and the NTSC on 3.58 MHz. U80 the chrominance amplifier is driven by either the video signal or the test circle oscillator, depending on whether U76B or U76C is closed. 3- 8 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 73 Oscillator is input to the Chroma Filter when OSC SEL goes low to close U76B, and OSC SEL goes high to open U76C and disconnect the incoming video signal. 3- 9 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 74 CRT orthogonality error. U57A and B are noninverting buffer amplifiers driving U64B, which converts the differential signals to a single-en- ded voltage that is applied through R168, the Y Align adjustment. 3- 10 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 75 VOUT+ and VOUT- - terminals. The + and - -H signals from the VOUT terminals are also supplied to the Vertical Deflection Amplifier (Diagram 6) for ortho- gonality adjustment (Y-Align). 3- 11 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 76 Microprocessor writes the 8 MSBs into the NOVRAM when both CE and WE are pulled low. RW from the Microprocessor pulls down WE. CE is pulled low by NOVRAM which is decoded by the address decoder. Content of the 3- 12 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 77 U23 buffers 5 outputs and 1 input for the Microprocessor. It is permanently enabled by pulling pins 1G and 2G low. 2G is set up to be pulled low when a Component (1760 Series) board is installed. 3- 13 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 78 Output signals from the Microprocessor are timed out to analog switches and DACs by the Line Rate Controller clocks synchronous latches. Each latch is clocked by its own individual output from the Line Rate Controller. 3- 14 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 79 U48D, whose output is a negative-going sawtooth waveform. Charging current is controlled by the Shape adjustment (R134 or R135). The output of the Readout Stroke Generator drives the Vertical and Horizontal deflection circuits when readout is enabled. 3- 15 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 80 J5. Not all signals routed through the connectors are used by the Component board. The serial digital bus (MISO) is routed to the Component circuit board. (1760 Series Only) 3- 16 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 81: Diagram <11> Z-Axis & Control
The VPP1 supply is used to program the Flash EPROM. For normal operation, P4 is in the 2- -3 position. U20 is a voltage sensing regulator whose output voltage is established by R46 and R47. 3- 17 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 82: Diagram <12> Front Panel
If an SCH board is installed, the SCH ID0- -SCH ID3 inputs to U27 are held low for recognition by the Microprocessor (when it requests ID over the buffered serial bus). 3- 18 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 83: Diagram <14> Subcarrier Regenerator
C58, R108, R107, and C65 are the filter elements. When lockup is achieved, U20B closes and shunts another filter, consisting of C59, R109, and C66, across the filter to slow down filter response and make it less sensitive to noise. 3- 19 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 84 Subcarrier Regenerator is locked to the correct phase. In addition, when U23B is locked out the Preset line for U28B goes high, which allows it to be clocked by the H rate clock signal. 3- 20 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 85: Diagram <15> Phase Shifter
Main (A3) circuit board. U10 and U9 are the post regulators for the - -8 V and +8 V supplies. 3- 21 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 86: Diagram <16> Demodulator
The demodulator gains are set by R36 for R- -Y and R52 for B- -Y. R36 is the +V Balance which provides offset voltage for pins 2 and 3. The bias is controlled by the Center Dot Position Clamp circuits. 3- 22 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 87: Diagram <17> Internal Sch
Y1 (NTSC) or Y2 (PAL) and varactor CR10. C42 and C46 are adjusted so that the oscillator runs at 4 x F when there is 5.5 V on the varactor. 3- 23 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 88 The resultant difference is the horizontal-to-subcarrier phase error. 3- 24 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 89 U9 requires additional inputs from the NTSC and PAL pulse generators on Diagram 18, plus inputs from the Line Rate Controller to assist in locating line 21 (NTSC) or line 18 (PAL), which are by definition, in color frame 1. 3- 25 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 90: Diagram <18> Reference Sch
C40 and C41, form the loop filter that controls the phase locked loop response. The net current flow into the loop filter produces the VCO control voltage, which controls the varactors, CR3 and CR4, through U14B. 3- 26 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 91 Field 2 Field 3 Field 4 Occurs in SCH field pulse from U9 field 1 only Figure 3- 1: NTSC line count (U24) & color frame 1 SCH field pulse 3- 27 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 92: Diagram <19> Component Inputs, Transcoders, & Rgb Outputs
Q4 and Q5 form the channel 1 (Y) driver, Q14 and Q15 are the channel 2 (P ) driver, and Q24 and Q25 are the channel 3 (P ) driver. 3- 28 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 93: Table 3- 1: Transcoder Signal Mixing
U70. Its output is the four signals required to create the diamond display (G+R, G+B, B- -G, and R- -G). Signal gain is approximately 0.5. C74 is adjusted for clean, sharp transitions between the dots. 3- 29 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 94: Diagram <20> Component Control And Switching (1760 Series Only)
B-G (SW 1) Ground (SW 2) G+R (SW 8) R-G (SW 8) Bowtie (Difference) Y (SW 3) Ground (SW 5) (SW 10) Y (SW 3) Ground (SW 5) (SW 11) 3- 30 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 95 U171 change. When the changes are compared to a fixed level (the opposite side of the comparator amplifier) the mixer output changes to create a bright-up level. 3- 31 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 96: Diagram <21> Low Voltage Power Supply
In order to prevent the one-shot multivibrator, U5A, from tripping U8A if power is lost, a short-time constant (C56 and R89) pulls V for U5A down before Q13 stops oscillating. 3- 32 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 97 Q14 reduces RF interference. Output Filters The three output windings supply four output voltages. Each output is rectified by a single diode and filtered by an LC pi filter. 3- 33 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 98 DS6, an LED that is internal to the instrument, is lit whenever the +5 V supply is running. This is a servicing aid, which makes it possible to determine if the power supply is operating without having to look at the front panel. 3- 34 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 99: Diagram <22> High Volts Power Supply
The 200 V p-to-p sine wave present at the cathode of CR11 is input to the grid drive circuit where it is clipped for use as CRT control grid bias. 3- 35 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 100: Figure 3- 3: Pinout Of The Crt Socket
ASTIG (g4) GEOM (g5) VERT PLATE (y2) VERT PLATE (y1) HORIZ PLATE (x2) 1st ANODE (g2) HORIZ PLATE (x1) Filament (f) Figure 3- 3: Pinout of the CRT socket 3- 36 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 101: Performance Verification
Time Base: 10 ns/Div to 5 ms/Div sweep speeds, triggering to 50 MHz. For example: A TEKTRONIX TAS 465 Oscilloscope. Also 10X probe, P6109B, and 1X probe, P6119B. 2. Television Signal Generator Color test signals for the television standard of the monitor to be tested: color bar signal, linearity staircase and variable apl, pulse and bar;...
Page 102 7. Variable Autotransformer For example: General Radio Metered Auto Transformer W10MT3W. If 220 V operation must be checked, a conversion transformer or appropriate 220 V autotrans- former is needed. 4- 2 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 103 015-0413-00) installed in a TM500- -Series Power Module. 12. Power Module For powering and housing Tektronix SG503, FG503, DM501A, DC503A, 067-0916-00, and a 015-0408-00. For example: Tektronix TM500- -Series Power Module. 4- 3 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 104: Figure 4- 1: External Horizontal Or Rgb/Yrgb Cable Adapter
Three 75 Ω cables required, one precision (1%) 50 Ω cable required. For example: 75 Ω - - 42-inch (Tektronix Part No. 012-0159-00). 50 Ω - - 36-inch 1% precision (Tektronix Part No. 012-0482-00). 15. Dual Input Coupler Matched BNC cable-T for making phase comparisons between two inputs.
Page 105: Figure 4- 2: Remote Sync Cable Adapter
Figure 4- 2: Remote Sync Cable Adapter 18. Audio and Timecode Cable Adapter 25-Pin male connector to remote connector Banana connectors +Signal Common - - Signal Figure 4- 3: Audio and Timecode Cable Adapter 4- 5 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 106: Performance Check Procedure Short-Form Reference
Overscan Baseline Distortion: ≤1% (7 mV) variation. Overscan 4- - 22 Preshoot, Overshoot, and Ringing: ≤1%. Pulse-to-Bar Ratio: Transient Response (Waveform Display) 4- - 22 0.99:1 to 1.01:1. Field Rate Tilt: ≤1%. 4- 6 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 107 Bowtie gain matches CH-A1 INPUT gain 2%. Bowtie DC 4- - 36 offset between channels <5 mV. ≥34 dB at 3 MHz. Bowtie Common Mode Rejection Ratio 4- - 37 (1760- - Series Only) 4- 7 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 108 Diamond Display Phase (1760- - Series Only) Opening of <2 minor divisions on the vertical transition. 4- - 39 GBR Picture Monitor Outputs (1760- - Series Accuracy: 4- - 39 Only) 4- 8 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 109: Performance Check Procedure
Section 2. Enter the CRT menu and adjust the FOCUS, SCALE, and INTENSITY controls (bezel knobs) for best viewing of the display. Exit the CRT menu. 4- 9 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 110 Select PARADE (front panel). Note: CH-A, CH-A1, CH-A2, and CH-A3 INPUTs should be selected. c. Enter the GAIN menu and select X10 (CRT menu). If desired, press the CLEAR MENU button (front panel) to remove the readout. 4- 10 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 111 Check - - that the CH-A and CH-B baselines are within ≤1 IRE (7 mV PAL) of each other (1 major division). Select CH-A, CH-B1, CH-B2, and CH-B3 INPUTs. Note: Deselect CH-B INPUT. 4- 11 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 112 Requirement - - Any portion of the synchronized sweep can be positioned on screen in all sweep modes. a. Connect the color bar signal to the CH-A INPUT and terminate the loop-through connector in 75 Ω. 4- 12 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 113 Turn off the MAG SWEEP and select 1 LINE SWEEP (5 s/div). g. Check - - for one cycle of calibrator signal per two major divisions 1 minor division over the center 10 divisions. 4- 13 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 114 Replace the color bar signal on the CH-A INPUT with the output from the VAC. Remove the loop-through terminator. Set the VAC amplitude to 999.9 mV, and select +LUM. b. Select EXT REF. 4- 14 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 115 Check - - by adjusting the VAR GAIN control (bezel knob), that the signal amplitude can be adjusted to >100 IRE (700 mV PAL). u. Enter the GAIN menu and select VARIABLE OFF. Exit the GAIN menu. 4- 15 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 116: Figure 4- 4: Timing Cursor Check
Check - - that the cursor reading is 100 s 0.5 s. Replace the VAC output on the CH-A INPUT with the color bar signal. Terminate the loop-through in 75 Ω. 4- 16 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 117: Table 4- 2: Vector Cursor Readout Values
Connect a 75 Ω cable from the 1740A/1750A/1760- -Series PIX OUT to the test oscilloscope, terminating the oscilloscope end of the cable with a 75 Ω feedthrough terminator. 4- 17 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 118 14 mV PAL) while varying the leveled sine wave generator frequency from 1.0 to 10.0 MHz. Remove the Peak-to-Peak Detector Head from the CH-A INPUT and terminate the loop-through in 75 Ω. 4- 18 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 119 1740A/1750A/1760- -Series. c. Enter the FILTER menu. d. Check - - by switching between FLAT and LUM(CRT menu), that the amplitude changes <1 IRE (7 mV PAL). 4- 19 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 120 Enter the GAIN menu and select X1. Exit the GAIN menu. b. Enter the FILTER menu and select FLAT. c. Adjust the leveled sine wave generator amplitude for a 100 IRE (700 mV PAL) display on the 1740A/1750A/1760- -Series. 4- 20 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 121 Set the leveled sine wave generator frequency to 2.98 MHz (3.83 MHz PAL). d. Check - - that the circle is inside the 3 dB marks. e. Set the leveled sine wave generator frequency to 3.18 MHz (4.03 MHz PAL). 4- 21 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 122 Full, Luminance On, Setup Off (NTSC only), Window Off, Field Sq Wave Off, Burst On, T Pulse On, and T Bar On. c. Check - - that the preshoot, overshoot, and ringing is within (0.5 minor division). 4- 22 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 123 Check - - that the displayed amplitude is >126 IRE (900 mV PAL). Enter the CONFIG menu and select DC RESTORER FAST. Enter the GAIN menu and select X10. Press the CLEAR MENU button. Select 2 FIELD SWEEP and EXT REF. 4- 23 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 124: Figure 4- 5: Fast Dc Restorer Response
Leave the loop- through connector terminated. c. Enter the GAIN menu and select X10. If desired, press the CLEAR MENU button to remove the readout. 4- 24 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 125 Replace the linearity signal on the CH-A INPUT with the output from the leveled sine wave generator. Leave the loop-through terminated. Enter the FILTER menu and select FLAT. If desired, press the CLEAR MENU button to remove the readout. 4- 25 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 126 Enter the CONFIG menu. Select VECTOR, then select VECTOR TEST e. Check - - for the best overlay of the circles without any separation, and best center dot overlay (should appear to be one dot). 4- 26 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 127: Figure 4- 6: R- Y Display
Select 100% bars on the color bar signal. e. Enter the CONFIG menu. Select VECTOR, then select 100% BARS. If desired, press the CLEAR MENU button to remove the readout. 4- 27 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 128 Remove the color bar signal from the CH-A INPUT. Move the black burst signal from the EXT REF INPUT and connect it to the CH-A INPUT. Leave the CH-A INPUT terminated. b. Select MULTIPLE DISPLAY. Vector and waveform displays selected. 4- 28 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 129 Requirement - - Clamp Stability: ≤1/64 inch (0.4 mm). Phase Control Range: 360° continuous rotation. Position Control Range: ≥0.236 inch (6 mm) from center. a. Select CH-A INPUT and INT REF. 4- 29 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 130 Set pin 3 of the remote cable low. Check - - that the two vertical lines are 10.0 divisions apart 1 minor division. g. Set pin 3 of the remote cable high. 4- 30 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 131 Check - - for a 140 IRE display 7 IRE (1.0 V 50 mV PAL). k. Repeat parts a. through j. using the Gain and signal amplitude settings in Table 4- -3. 4- 31 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 132: Table 4- 3: Audio And Timecode Values
REMOTE INPUT connector pins 8 and 10. e. Check - - for up to a trace width of eye opening in the audio trace (1%). See Figure 4- -7. 4- 32 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 133: Figure 4- 7: Audio Display
30 Hz, and the amplitude for a 1 V display on the 1740A/1750A/1760- -Series. e. Check - - the display for a locked sine wave. Set the function generator frequency to 60 Hz. 4- 33 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 134 Check - - that a positive-going pulse in the test oscilloscope CH1 (PIX OUT) display occurs at the same time as the pulse in the CH2 display (frame black signal). 4- 34 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 135 When this step is completed, leave the generator and instrument in 100% Bars. 36. Lightning Gain (1760- -Series Only) Requirement - - Vertical Gain Accuracy: a. Select LIGHTNING DISPLAY. 4- 35 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 136: Figure 4- 8: Option Blanking Pulse
Figure 4- 8: Option Blanking Pulse 38. Bowtie Gain and Offset (1760- -Series Only) Requirement - - Bowtie gain matches CH-A1 INPUT gain 2%. Bowtie DC offset between channels <5 mV. 4- 36 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 137 Select A123. Enter the GAIN menu and select X5. e. Check - - that the amplitude of the 3 MHz packet is < 0.4 division. See Figure 4- -9. 4- 37 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 138: Figure 4- 9: Bowtie Common Mode Rejection Ratio
HORIZ POS controls. c. Enter the GAIN menu and select X5. d. Check - - that the signal center dot is within 1/4 inch of the CRT graticule center. 4- 38 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 139 Repeat step e. for the FORMAT menu selections of BETA, GBR, and MII. g. Repeat steps d. through f. for the B and R OUTPUTs. This completes the 1760- -Series Performance Verification procedure. 4- 39 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 140 Performance Verification 4- 40 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 141: Adjustments
30 MHz Bandwidth, 2 mV Sensitivity. Time Base: 10 ns/div to 5 ms/div sweep speeds, Triggering to 50 MHz. For example: A TEKTRONIX TAS 465 Oscilloscope. Also 10X probe, P6109B, and 1X probe, P6119B. 5- 1 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 142 Color test signals for the television standard of the monitor to be tested: Color bar signal, multiburst signal, and black burst signal. For example: NTSC Tektronix 1410 with Option AA and Option AB (modified SPG2 and TSG7), TSG3, and TSG5. PAL Tektronix 1411 with Option AA and Option AB (modified SPG12 and TSG17), TSG13, and TSG15.
Page 143 For powering and housing Tektronix SG505, FG503, DM501A, DC503A, 067-0916-00, and a 015-0408-00. For example: Tektronix TM500- -Series Power Module. 12. Low-Distortion Oscillator 1-kHz balanced output, 387 mV to 1.54 V amplitude. For example: Tektronix FG501A 5- 3 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 144 15. Coaxial Cable Three 75 Ω cables required; one 50 Ω cable required. For example: 75 Ω - - 42-inch RG59U (Tektronix Part No. 012-0159-00). 50 Ω - - 42-inch RG58U (Tektronix Part No. 012-0057-01). 16. Dual-Input Coupler Matched BNC cable-T for making phase comparisons between two inputs.
Page 145: Figure 5- 1: External Horizontal/Rgb And Yrgb Cable Adapter
Figure 5- 1: External horizontal/RGB and YRGB cable adapter 19. Remote sync cable adapter 25-Pin male connector to remote connector Female BNC Signal Connect to ground Figure 5- 2: Remote sync cable adapter 5- 5 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 146: Figure 5- 3: Audio And Timecode Cable Adapter
For a 25-pin to 9-pin adapter, construct one as shown in Fig- ure 5- -5 or purchase an RS232 DTE cable or adapter. Do not use a DCE or modem cable. 5- 6 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 147 Standard hookup 9-Pin female 9-Pin male connector to connector to PC 1740A/1750A/1760 Series Signal Ground Alternate hookup Figure 5- 4: RS232 cable standard and alternate connections for 9-pin PC connector 5- 7 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 148 Signal ground Alternate hookup Figure 5- 5: RS232 cable standard and alternate hookups for 25-pin PC connector Optional Equipment 22. Magnifying Glass May be useful for viewing the CRT graticule. 5- 8 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 149: Initial Setup
PC hard drive and copy the contents of the disk into the directory. d. Type CAL and then press the Return key. The program will prompt for a few parameters before the adjustment steps start. 5- 9 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 150: Functional Description Of Pc Display
<PAGE DOWN FOR MORE INSTRUCTIONS> WFM INTENSITY AUDIO INTENSITY Adj. Size VECTOR INTENSITY to adjust to adjust F8 F9 F10 change Adj. Size Figure 5- 6: Typical adjustment procedures PC screen display 5- 10 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 151 11 Lists adjustments for the current step. The active adjustment is highlighted. The Left/Right PC arrow keys control the adjustment selection. 12 Displays the procedure steps to be performed. If additional steps are indicated, ress PAGE DOWN. 5- 11 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 152: Circuit Board Adjustment Locations
Figures 5- -7 through 5- -11 show the adjustment locations on the circuit boards. Mains voltage Figure 5- 7: A1 Power Supply board R168 C131 R182 C135 C137 R183 C151 C154 R134 R135 Figure 5- 8: A3 Main board 5- 12 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 153 Adjustments C106 C109 Figure 5- 9: A5 Vector board R173 Figure 5- 10: A6 SCH board 5- 13 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 154 Adjustments C136 C135 U126 R122 C111 U161 R601 R159 Figure 5- 11: A7 Component board 5- 14 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 155: Waveform Illustrations
1765 unless otherwise noted. 10 S/DIV NTSC Thinnest trace Figure 5- 12: Adjusting for thinnest luminance step Match transient responses 10 S/DIV NTSC Figure 5- 13: Matching flat and luminance filter responses 5- 15 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 156 Adjustments 50uS Figure 5- 14: Adjusting the NTSC SCH on the oscilloscope NTSC Approximate flipping points Figure 5- 15: Matching the SCH dot flipping points 5- 16 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 157 Adjustments 50% Point 100mV Figure 5- 16: Adjusting the option blanking pulse 625/50 10 S/DIV 3 MHz packet Figure 5- 17: Adjusting for minimum Bowtie amplitude 5- 17 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 158 Adjustments 625/50 Adjust for minimum opening Figure 5- 18: Adjusting Diamond display phase 5- 18 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 159: Maintenance
Under average conditions, scheduled preventive maintenance should be performed every 2000 hours of operation. 6- 1 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 160: Performance Checks And Adjustments
Use a 75% isopropyl alcohol solution as a cleaner and rinse with deionized water. Before using any other type of cleaner, consult your Tektronix Service Center or representative. 6- 2 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 161: Table 6- 1: External Inspection Check List
Install the cover with the two mounting screws. Do not overtighten the screws. You can order additional air filters directly from Tektronix. The part number for the air filters is listed with the Optional Accessories at the rear of the Mechanical Replaceable Parts list, at the back of this manual.
Page 162 6. Determine the extent of the repair. If the necessary repair is complex, it may be advisable to contact Tektronix before continuing. If the repair is minor, such as replacing a component, see the parts list for replacement information.
Page 163: Replacing The Line Fuse
Power Supply installed in the instrument, apply AC power and turn on the front-panel POWER switch. From Table 6- -2, determine which symptom the Power Supply exhibits and refer to the corresponding procedure. 6- 5 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 164: Table 6- 2: Power Supply Fault Symptoms
Power Supply by removing the plug jumper from J4. c. Use the digital multimeter to measure the voltage between TP2 and the tab (drain) of Q14. Check that the voltage is near 0 V. 6- 6 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 165 W1 (+5 V). The circuit should draw less than 20 mA. Excessive current draw can be caused by CR17 or Q1 and Q2 (High Volts Power Supply). 6- 7 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 166: Table 6- 4: Control Circuit Test Points
Q13. With J3 unshorted, this point should have a 1 V, 170 kHz sine wave riding on 5 VDC. With J3 shorted this point should be at 5 VDC. 6- 8 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 167: Table 6- 5: Shut Down Logic Levels
Using the digital multimeter, measure the voltage at U6, pin 3. It should be approximately 5 VDC. Short the base to the emitter of Q15. Pin 3 should now measure 0 V. 6- 9 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 168 Short together the base and emitter of Q3. The collector of Q6 should be near 0 V. c. Short together the base and emitter of Q4. The collector of Q6 should be near 0 V. 6- 10 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 169 It should be approximately - -2530 V. d. Measure the voltage at the anode end of CR3. It should be 50- -150 V more negative than the reading from the anode of CR4. 6- 11 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 170: Corrective Maintenance
Maintenance Corrective Maintenance Tektronix maintains a service organization that can provide a number of services to assist in maintaining the instrument(s) operation at its specified levels. For more information, refer to Contacting Tektronix on page xiv. Circuit Boards The circuit boards are designated as assemblies, which are listed at the beginning of the Replaceable Electrical Parts list in this manual.
Page 171: Mechanical Disassembly/Assembly
1. Remove the five knobs located below the CRT, using a -inch Allen wrench. See Figure 6- -2. Remove screws (2) Remove knobs (5) Figure 6- 2: Removing the CRT bezel 6- 13 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 172: Replacing The Graticule Light
PL317 (longer than PL312). Replacement bulbs are supplied with this instrument as Standard Accessories. Additional bulbs can be purchased from Tektronix (see Replaceable Electrical Parts list) or from local electronics distribution sources. CAUTION. Needle-nosed pliers are not recommended for bulb replacement.
Page 173 4. To install a bulb, hold it with the tweezers or fingers as described in step two, position it in front of the socket, and push the bulb with your finger until it snaps into place. 5. Replace the bezel. 6- 15 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 174: Removing The Crt
Removing the CRT To replace a CRT in an instrument with serial number below B030000, order an upgrade kit from Tektronix and follow the instructions in the kit. To remove the CRT in an instrument with serial number B030000 or greater, use the following procedure.
Page 175 Maintenance Manchet CRT shield Light filter Bezel Anode connector Anode cap Figure 6- 4: Removing or replacing the CRT 6- 17 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 176 7. Clean the CRT light filter and position it in front of the CRT screen. 8. Replace the bezel. If the fit is too tight to allow the bezel to go into position, reposition the CRT bracket (refer to step 10). 6- 18 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 177: Removing The Rear Panel
-inch nut driver or box end wrench to remove the four securing screws. See Figure 6- -6. 3. To replace the rear panel and Input assembly, reverse the procedure. 6- 19 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 178 Maintenance Figure 6- 5: Removing the rear panel and Input/BNC assembly Remove securing nuts (4) Figure 6- 6: Disassembling Input/BNC assembly A4/A4- A1 6- 20 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 179: Removing The Front Panel And The Front Panel Circuit Board
See Figure 6- -8. b. The board should now separate from the front panel, spacer, and the switches to make the components accessible. 5. To reassemble, reverse the procedure. 6- 21 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 180: Removing The Main Board
-inch nut driver or box end wrench to remove the mounting studs for the rear-panel RS232 and REMOTE connectors. 5. Remove the eight screws that are holding the board in place. See Figure 6- -9. 6- 22 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 181 8. To replace the Main board, lay the board flat and slide it back into place, and then reverse the rest of the steps in the removal procedure. 6- 23 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 182: Removing The Power Supply Board
CRT. Do not allow the conductor to touch your body or any circuitry. 4. Remove the connectors on J1, J2, J4, and J5. 6- 24 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 183: Removing The Vector Board
3. Remove the three screws holding the circuit board in place. See Figure 6- -11. 4. Move top of circuit board out and up to remove. 5. To install the circuit board, reverse the procedure. 6- 25 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 184: Removing The Sch Board
2. Remove the two rear-panel screws securing the GBR connectors. See (1760 Series only) Figure 6- -12. Remove screws (3) Remove screws (2) Figure 6- 12: Component circuit board mounting hardware 6- 26 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 185: Repackaging
Allow three inches on all sides for cushioning. 4. Seal the carton with shipping tape or an industrial stapler. Figure 6- 13: Repackaging a 1740A, 1750A, or 1760 Series instrument 6- 27 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 186 H Type and serial number of the instrument. H Reason for returning. H A complete description of the service required. Mark the address of the Tektronix Service Center and the return address on the shipping carton in two prominent locations. 6- 28...
Page 187 Option SC is a catalog option to allow the instrument to make all measurements that the 1750A- -Series can make. Existing instruments can be upgraded; contact your Tektronix representative for more information. CRT Options The standard instrument is shipped with a P31 (green) phosphor CRT installed.
Page 188 Table 7- 1: Power cord identification Plug configuration Normal usage Option number North America Standard 120 V Universal Euro United Kingdom Australia North America 240 V Switzerland China No power cord supplied. 7- 2 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 189 H 1700F07 Utility Drawer. When only one side of a dual rack adapter is used, an alternate to the blank panel is the 1700F07 utility drawer. This drawer provides over -cubic foot of accessory storage. The drawer kit includes a permanently mounted tray. 7- 3 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 190 Options and Accessories 7- 4 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 191 This section contains a list of the electrical components for the <instrument>. Use this list to identify and order replacement parts. Parts Ordering Information Replacement parts are available through your local Tektronix field office or representative. Changes to Tektronix products are sometimes made to accommodate improved components as they become available and to give you the benefit of the latest improvements.
Page 192 Chassis-mounted parts have no assembly number prefix, and they are located at the end of the electrical parts list. Tektronix part number Use this part number when ordering replacement parts from Tektronix. 3 and 4 Serial number Column three indicates the serial number at which the part was first effective. Column four indicates the serial number at which the part was discontinued.
Page 193 PACOIMA, CA 91331 55680 NICHICON (AMERICA) CORP 927 E STATE PARKWAY SCHAUMBURG, IL 60195- - 4526 57924 BOURNS INC INTEGRATED TECHNOLOGY DIV. 1400 NORTH LOGAN, UT 84321 1000 WEST 8- 3 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 194 CYPRESS, CA 90630- - 0016 TK6159 ARROW/RICHEY ELECTRONICS ARROW/RICHEY VALUE ADDED 3601 SW BEAVERTON, OR 97005 MURRY BLVD SUITE 60 TK6399 VISHAY BC COMPONENTS 3939 BELTILINE RD SUITE 710 ADDISON, TX 75001 8- 4 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 195 CIRCUIT BD ASSY:POWER SUPPLY 80009 671- - 2484- - 06 * ATTACHED PARTS* 337- - 3801- - 00 671-2484-00 671-2484-00 SHIELD,ELEC:POWER SUPPLY TK1947 337- - 3801- - 00 *END ATTACHED PARTS* 8- 5 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 196 290- - 1267- - 00 CAP,FXD,ALUM:560UF,20%,50V,ESR=0.40 OHM (100KHZ,20C) 0H1N5 CEEFM1H561M7 A1C32 290- - 0939- - 00 CAP,FXD,ELCTLT:10UF,+100- - 10%,100V 62643 LX100VB10RM10X2 A1C33 290- - 0939- - 00 CAP,FXD,ELCTLT:10UF,+100- - 10%,100V 62643 LX100VB10RM10X2 8- 6 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 197 SA102A101JAA A1C68 281- - 0765- - 00 CAP,FXD,CER DI:100PF,5%,100V 04222 SA102A101JAA A1C69 281- - 0775- - 01 CAP,FXD,CERAMIC:MCL;0.1UF,20%,50V,Z5U,0.170 04222 SA105E104MAA A1C70 281- - 0775- - 01 CAP,FXD,CERAMIC:MCL;0.1UF,20%,50V,Z5U,0.170 04222 SA105E104MAA 8- 7 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 198 152- - 0720- - 00 DIODE,RECT:ULTRA FAST;200V,8A,25NS,100A IF SM 0LUA3 BYW29- - 200 *ATTACHED PARTS* 210- - 0406- - 00 NUT,PLAIN,HEX:4- - 40 X 0.188,BRS CD PL 73743 12161- - 50 8- 8 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 199 131- - 5337- - 00 CONN,HDR:PCB/WIREWRAP;MALE,STR,1 X 4,0.150 22526 65561- - 104 A1J3 131- - 4794- - 00 CONN,HDR:PCB;MALE,STR,1 X 2,0.1 CTR,0.235 53387 2402- - 6112 UB MLG X 0.112 TAIL,30GOLD,0.035 DIA PCB 8- 9 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 200 TK0435 ORDER BY DESC 214- - 3841- - 00 HEAT SINK,SEMIC:XTR,TO- - 220;VERTICALMOUNT,(2)SOLD- 13103 6021PB ERABLE TABS,ALUMINUM,BLACK ANODIZE *END ATTACHED PARTS* A1Q8 151- - 0216- - 04 XTR,SIG:BIPOLAR,PNP;25V,100MA,170MHZ,AMPL 04713 MPS6523RLRP 8- 10 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 201 RES,FXD:METAL FILM;121 OHM,1%,0.2W,TC=100 PPM 91637 CCF501G121ROF A1R23 322- - 3385- - 00 RES,FXD:METAL FILM;100K OHM,1%,0.2W,TC=100 PPM 91637 CCF501G10002F A1R24 322- - 3222- - 00 RES,FXD:METAL FILM;2K OHM,1%,0.2W,TC=100 PPM 91637 CCF501G20000F 8- 11 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 202 RES,FXD:METAL FILM;1K OHM,1%,0.2W,TC=100 PPM 91637 CCF501G10000F A1R57 322- - 3235- - 00 RES,FXD:METAL FILM;2.74K OHM,1%,0.2W,TC=100 91637 CCF501G27400F A1R58 322- - 3193- - 00 RES,FXD:METAL FILM;1K OHM,1%,0.2W,TC=100 PPM 91637 CCF501G10000F 8- 12 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 203 322- - 3193- - 00 RES,FXD:METAL FILM;1K OHM,1%,0.2W,TC=100 PPM 91637 CCF501G10000F A1R92 322- - 3205- - 00 RES,FXD,FILM:1.33K OHM,1%,0.2W,TC=T0 91637 CCF501G13300F A1R93 322- - 3121- - 00 RES,FXD:METAL FILM;178 OHM,1%,0.2W,TC=100 PPM 91637 CCF501G178R0F 8- 13 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 204 322- - 3254- - 00 RES,FXD,FILM:4.32K OHM,1%,0.2W,TC=T0MI,SM BODY 91637 CCF502G4321FT A1T1 120- - 1695- - 00 TRANSFORMER,PWR:HIGH VOLTAGE,FEEDBACK 3V, 75498 120- - 1695- - 00 RESONANT 231V, 100V 1MA,2750V 3.3MA, 6.3V 86MA 8- 14 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 205 RES,FXD:THICK FILM;68.1 OHM,1%,0.125W,TC=100 PPM 50139 BCD68R1FT A2R4 321- - 5045- - 00 RES,FXD:THICK FILM;68.1 OHM,1%,0.125W,TC=100 PPM 50139 BCD68R1FT A2R5 321- - 5045- - 00 RES,FXD:THICK FILM;68.1 OHM,1%,0.125W,TC=100 PPM 50139 BCD68R1FT 8- 15 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 206 RES,FXD:THICK FILM;10.0K OHM,1%,0.125W,TC=100 PPM 50139 BCK1002FT A2R40 321- - 5030- - 00 RES,FXD:THICK FILM;10.0K OHM,1%,0.125W,TC=100 PPM 50139 BCK1002FT A2R41 321- - 5030- - 00 RES,FXD:THICK FILM;10.0K OHM,1%,0.125W,TC=100 PPM 50139 BCK1002FT 8- 16 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 207 HLMP- - P505- - 021 DEG VIEW ANGL,YOKE LEAD BEND A2DS6 150- - 5011- - 00 DIODE,OPTO:LED;HIGH EFF,GRN,569NM,1MCD AT 10MA,125 50434 HLMP- - P505- - 021 DEG VIEW ANGL,YOKE LEAD BEND 8- 17 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 208 HLMP- - P505- - 021 DEG VIEW ANGL,YOKE LEAD BEND A2DS30 150- - 5011- - 00 DIODE,OPTO:LED;HIGH EFF,GRN,569NM,1MCD AT 10MA,125 50434 HLMP- - P505- - 021 DEG VIEW ANGL,YOKE LEAD BEND 8- 18 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 209 283- - 5114- - 00 CAP,FXD,CERAMIC:MLC,0.1UF,10%,50V,X7R,1206,SMD 04222 12065C104KAT2A MYRTLE BEACH A3C9 290- - 5024- - 00 CAP,FXD,TANT:3.3UF,20%,25V,0.236 X 0.126,6032 04222 TAJC335M025 A3C10 283- - 5114- - 00 CAP,FXD,CERAMIC:MLC,0.1UF,10%,50V,X7R,1206,SMD 04222 12065C104KAT2A MYRTLE BEACH 8- 19 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 210 283- - 5114- - 00 CAP,FXD,CERAMIC:MLC,0.1UF,10%,50V,X7R,1206,SMD 04222 12065C104KAT2A MYRTLE BEACH A3C34 283- - 5114- - 00 CAP,FXD,CERAMIC:MLC,0.1UF,10%,50V,X7R,1206,SMD 04222 12065C104KAT2A MYRTLE BEACH A3C35 283- - 5114- - 00 CAP,FXD,CERAMIC:MLC,0.1UF,10%,50V,X7R,1206,SMD 04222 12065C104KAT2A MYRTLE BEACH 8- 20 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 211 283- - 5114- - 00 CAP,FXD,CERAMIC:MLC,0.1UF,10%,50V,X7R,1206,SMD 04222 12065C104KAT2A MYRTLE BEACH A3C60 283- - 5114- - 00 CAP,FXD,CERAMIC:MLC,0.1UF,10%,50V,X7R,1206,SMD 04222 12065C104KAT2A MYRTLE BEACH A3C61 283- - 5114- - 00 CAP,FXD,CERAMIC:MLC,0.1UF,10%,50V,X7R,1206,SMD 04222 12065C104KAT2A MYRTLE BEACH 8- 21 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 212 283- - 5188- - 00 B020101 CAP,FXD,CERAMIC:MLC,100PF,5%,100V,NPO,SMD 04222 12061A101JAT2A A3C85 283- - 5114- - 00 CAP,FXD,CERAMIC:MLC,0.1UF,10%,50V,X7R,1206,SMD 04222 12065C104KAT2A MYRTLE BEACH A3C86 283- - 5114- - 00 CAP,FXD,CERAMIC:MLC,0.1UF,10%,50V,X7R,1206,SMD 04222 12065C104KAT2A MYRTLE BEACH 8- 22 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 213 283- - 5114- - 00 CAP,FXD,CERAMIC:MLC,0.1UF,10%,50V,X7R,1206,SMD 04222 12065C104KAT2A MYRTLE BEACH A3C113 283- - 5114- - 00 CAP,FXD,CERAMIC:MLC,0.1UF,10%,50V,X7R,1206,SMD 04222 12065C104KAT2A MYRTLE BEACH A3C115 283- - 5114- - 00 CAP,FXD,CERAMIC:MLC,0.1UF,10%,50V,X7R,1206,SMD 04222 12065C104KAT2A MYRTLE BEACH 8- 23 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 214 MYRTLE BEACH A3C144 283- - 0639- - 01 CAP,FXD,MICA DI:56PF,1%,500V 09023 CDA15ED560F03 A3C145 283- - 5108- - 00 CAP,FXD,CERAMIC:MLC;68PF,5%,100V,NPO,1206 04222 12061A680JAT1A A3C146 283- - 5196- - 00 CAP,FXD,CERAMIC:MLC;47PF,5%,100V,NPO,1206 04222 12061A470JAT1A 8- 24 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 215 290- - 5036- - 01 671-2355-13 CAP,FXD,ALUM:22UF,20%,16V,5.7MM(0.224) 62643 MVK16VC22RME60T A3C172 283- - 5267- - 00 671-2355-14 CAP,FXD,CERAMIC:MLC,1.0UF,+80%- - 20%,25V,1206,SMD 04222 12063G105ZAT4A A3C173 283- - 5114- - 00 CAP,FXD,CERAMIC:MLC,0.1UF,10%,50V,X7R,1206,SMD 04222 12065C104KAT2A MYRTLE BEACH 8- 25 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 216 TK2058 NL453232T- - 4R7M 1 OHM,Q>50,SRF>45 MHZ A3L3 108- - 5002- - 00 INDUCTOR,FXD:SIGNAL;15UH,10%,I<0.2A,RDC<2.5 TK2058 NL453232T- - 150K OHM,Q>50,SRF>20MHZ A3L4 108- - 5002- - 00 INDUCTOR,FXD:SIGNAL;15UH,10%,I<0.2A,RDC<2.5 TK2058 NL453232T- - 150K OHM,Q>50,SRF>20MHZ 8- 26 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 217 0LUA3 PMBT3906TRL A3Q20 151- - 5029- - 00 XTR,SIG:BIPOLAR,NPN;15V,500MA,SWITCHING 04713 MMBT2369LT1 A3Q21 151- - 5001- - 00 XTR,SIG:BIPOLAR,NPN;40V,200MA,300MHZ,AMPL 0LUA3 PMBT3904TRL A3Q22 151- - 5000- - 00 XTR,SIG:BIPOLAR,PNP;40V,200MA,250MHZ,AMPL 0LUA3 PMBT3906TRL 8- 27 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 218 RES,FXD:THICK FILM;10.0K OHM,1%,0.125W,TC=100 PPM 50139 BCK1002FT A3R25 321- - 5051- - 00 RES,FXD:THICK FILM;0 OHM,1%,0.125W,TC=100 PPM 09969 CRCW1206 JUMPER A3R26 321- - 5051- - 00 RES,FXD:THICK FILM;0 OHM,1%,0.125W,TC=100 PPM 09969 CRCW1206 JUMPER 8- 28 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 219 RES,FXD:THICK FILM;10.0K OHM,1%,0.125W,TC=100 PPM 50139 BCK1002FT A3R61 321- - 5169- - 00 RES,FXD:THICK FILM;475K OHM,1%,0.125W,TC=100 PPM 59124 RK73H2B4753FT A3R62 321- - 5020- - 00 RES,FXD:THICK FILM;1.5K OHM,1%,0.125W,TC=100 PPM 50139 BCK1501FT 8- 29 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 220 RES,FXD:THICK FILM;150K OHM,1%,0.125W,TC=100 PPM 59124 RK73H2B1503FT A3R97 321- - 5047- - 00 RES,FXD:THICK FILM;100K OHM,1%,0.125W,TC=100 PPM 50139 BCK1003FT A3R99 321- - 5030- - 00 RES,FXD:THICK FILM;10.0K OHM,1%,0.125W,TC=100 PPM 50139 BCK1002FT 8- 30 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 221 RES,FXD:THICK FILM;1.5K OHM,1%,0.125W,TC=100 PPM 50139 BCK1501FT A3R133 321- - 5020- - 00 RES,FXD:THICK FILM;1.5K OHM,1%,0.125W,TC=100 PPM 50139 BCK1501FT A3R134 311- - 5036- - 00 RES,VAR,TRMR:CERMET;5K OHM,25%,0.25W,4MM SQ,TOP TK2073 G4DT502E 8- 31 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 222 RES,FXD:THICK FILM;100K OHM,1%,0.125W,TC=100 PPM 50139 BCK1003FT A3R168 311- - 5041- - 00 RES,VAR,TRMR:CERMET;100K OHM,25%,0.25W,4MMSQ, TK2073 G4DT104- - M TOP ADJ A3R169 321- - 5143- - 00 RES,FXD,FILM:301 OHM,1%,0.125W 91637 CRCW12063010FT 8- 32 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 223 RES,FXD:THICK FILM;3.32K OHM,1%,0.125W,TC=100 PPM 50139 BCK3321FT A3R203 321- - 5020- - 00 RES,FXD:THICK FILM;1.5K OHM,1%,0.125W,TC=100 PPM 50139 BCK1501FT A3R204 321- - 5030- - 00 RES,FXD:THICK FILM;10.0K OHM,1%,0.125W,TC=100 PPM 50139 BCK1002FT 8- 33 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 224 RES,FXD:THICK FILM;475 OHM,1%,0.125W,TC=100 50139 BCK4750FT A3R250 321- - 5047- - 00 RES,FXD:THICK FILM;100K OHM,1%,0.125W,TC=100 PPM 50139 BCK1003FT A3R251 321- - 5047- - 00 RES,FXD:THICK FILM;100K OHM,1%,0.125W,TC=100 PPM 50139 BCK1003FT 8- 34 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 225 321- - 5266- - 00 RES,FXD:THICK FILM;11K OHM,1%,0.125W,TC=100 59124 RK73H2B1102FT A3R288 321- - 5012- - 00 RES,FXD:THICK FILM;332 OHM,1%,0.125W,TC=100 50139 BCK3320FT A3R289 321- - 5006- - 00 RES,FXD:THICK FILM;100 OHM,1%,0.125W,TC=100 50139 BCK1000FT 8- 35 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 226 RES,FXD:THICK FILM;4.75K OHM,1%,0.125W,TC=100 PPM 50139 BCK4751FT A3R324 321- - 5090- - 00 RES,FXD:THICK FILM; 20K OHM,0.125W,100 PPM,1206,T&R 50139 BCK2002FT A3R325 321- - 5026- - 00 RES,FXD:THICK FILM;4.75K OHM,1%,0.125W,TC=100 PPM 50139 BCK4751FT 8- 36 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 227 RES,FXD:THICK FILM;4.75K OHM,1%,0.125W,TC=100 PPM 50139 BCK4751FT A3R360 321- - 5047- - 00 RES,FXD:THICK FILM;100K OHM,1%,0.125W,TC=100 PPM 50139 BCK1003FT A3R361 321- - 5013- - 00 RES,FXD:THICK FILM;392 OHM,1%,0.125W,TC=100 50139 BCK3920FT 8- 37 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 228 RES,FXD:THICK FILM,75 OHM,1%,0.125W,TC=100 PPM 59124 RK73H2B75R0FT A3R430 321- - 5113- - 00 B020101 RES,FXD:THICK FILM,75 OHM,1%,0.125W,TC=100 PPM 59124 RK73H2B75R0FT A3R431 321- - 5113- - 00 B020101 RES,FXD:THICK FILM,75 OHM,1%,0.125W,TC=100 PPM 59124 RK73H2B75R0FT 8- 38 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 229 276- - 0614- - 00,8 TURNS WITH 31 AWG WIRE 176- - 0014- - XX A3U1 156- - 2051- - 01 MICROCKT,LINEAR:OPERATIONAL AMPL,QUAD,JET INPUT 01295 LF347DR A3U2 160- - 8970- - 00 IC,DIGITAL:CMOS,PLD;EEPLD,16V8,15NS,90MA 80009 160- - 8970- - 00 8- 39 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 230 156- - 5299- - 01 IC,LINEAR:BIPOLAR,VOLTAGE REGULATOR;NEGATIV 01295 MC79L05ACDR E,- - 5V,100MA,5% A3U34 156- - 6194- - 00 IC,DIGITAL:CMOS,PLD;FPGA,XC3000 FAMILY,3042 68994 XC3042- - 70PC84C ,144 CLBS,96 IOBS,74 I/O,70 MHZ 8- 40 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 231 156- - 6059- - 01 IC,MISC:CMOS,ANALOG SWITCH;QUAD 1ES66 DG444DY- - T A3U67 234- - 0728- - 22 IC,ASIC:BIPOLAR,VIDEO MULTIPLEXER,QC6- - 40,M639- - 028; 80009 234- - 0728- - 22 PLCC44,T&R 8- 41 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 232 158- - 0367- - 00 XTAL UNIT,QTZ:4.421303MHZ,+/- - 0.002%,PRL30PF,MINI DIP 14301 016- - 210- - 00054 PKG,8 PIN DIPCOMPATIBLE A3Y3 158- - 0368- - 00 XTAL UNIT,QTZ:3.589MHZ,0.002%,PAR,32PF,MINI 14301 016- - 210- - 00053 8- 42 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 233 B046031 CIRCUIT BD ASSY:INPUT & BNC 80009 672- - 1396- - 07 672- - 1396- - 08 B046032 CIRCUIT BD ASSY:INPUT & BNC 80009 672- - 1396- - 08 8- 43 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 234 283- - 5004- - 00 CAP,FXD,CERAMIC:MLC;0.1UF,10%,25V,X7R,1206 TK2058 C3216X7R1E104K- - A4C31 283- - 5004- - 00 CAP,FXD,CERAMIC:MLC;0.1UF,10%,25V,X7R,1206 TK2058 C3216X7R1E104K- - A4C32 283- - 5004- - 00 CAP,FXD,CERAMIC:MLC;0.1UF,10%,25V,X7R,1206 TK2058 C3216X7R1E104K- - 8- 44 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 235 TK2058 C3216X7R1E104K- - A4C61 283- - 5004- - 00 CAP,FXD,CERAMIC:MLC;0.1UF,10%,25V,X7R,1206 TK2058 C3216X7R1E104K- - A4C62 (TEST SELECTED) A4C63 (TEST SELECTED) A4C64 (TEST SELECTED) A4C65 (TEST SELECTED) A4C66 (TEST SELECTED) A4C67 (TEST SELECTED) 8- 45 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 236 RES,FXD:THICK FILM;182 OHM,1%,0.125W,TC=100 50139 BCK1820FT A4R3 321- - 5034- - 00 RES,FXD:THICK FILM;22.1K OHM,1%,0.125W,TC=100 PPM 50139 BCK2212FT A4R4 321- - 5018- - 00 RES,FXD:THICK FILM;1.0K OHM,1%,0.125W,TC=100 PPM 50139 BCK1001FT 8- 46 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 237 RES,FXD:THICK FILM;22.1K OHM,1%,0.125W,TC=100 PPM 50139 BCK2212FT A4R52 321- - 5018- - 00 RES,FXD:THICK FILM;1.0K OHM,1%,0.125W,TC=100 PPM 50139 BCK1001FT A4R56 321- - 5033- - 00 RES,FXD:THICK FILM;18.2K OHM,1%,0.125W,TC=100 PPM 50139 BCK1822FT 8- 47 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 238 RES,FXD:THICK FILM;39.2 OHM,1%,0.125W,TC=100 PPM 57668 MCR18FWEA39E2 A4R100 321- - 5042- - 00 RES,FXD:THICK FILM;39.2 OHM,1%,0.125W,TC=100 PPM 57668 MCR18FWEA39E2 A4R101 321- - 5042- - 00 RES,FXD:THICK FILM;39.2 OHM,1%,0.125W,TC=100 PPM 57668 MCR18FWEA39E2 8- 48 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 239 (4)0.040 SQ,0.189 TAIL,ON 0.250 CTRPCB A4A1J3 131- - 5647- - 00 672-1396-08 CONN,RF,JACK; BNC;75 OHM,FEMALE,STR,PCB,4,0.04 SQ 98291 058- - 151- - 0019- - 910 0.189 L TAILS ON 0.25 CTR,0.038 DIA CTR COND 8- 49 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 240 (4)0.040 SQ,0.189 TAIL,ON 0.250 CTRPCB A4A1J15 131- - 5647- - 00 672-1396-08 CONN,RF,JACK; BNC;75 OHM,FEMALE,STR,PCB,4,0.04 SQ 98291 058- - 151- - 0019- - 910 0.189 L TAILS ON 0.25 CTR,0.038 DIA CTR COND 8- 50 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 241 283- - 5004- - 00 CAP,FXD,CERAMIC:MLC;0.1UF,10%,25V,X7R,1206 TK2058 C3216X7R1E104K- - A5C19 283- - 5004- - 00 CAP,FXD,CERAMIC:MLC;0.1UF,10%,25V,X7R,1206 TK2058 C3216X7R1E104K- - A5C20 283- - 0728- - 01 CAP,FXD,MICA DI:120PF,1%,500V 09023 CDA15FD121F03 8- 51 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 242 283- - 5004- - 00 CAP,FXD,CERAMIC:MLC;0.1UF,10%,25V,X7R,1206 TK2058 C3216X7R1E104K- - A5C55 283- - 5004- - 00 CAP,FXD,CERAMIC:MLC;0.1UF,10%,25V,X7R,1206 TK2058 C3216X7R1E104K- - A5C56 283- - 5004- - 00 CAP,FXD,CERAMIC:MLC;0.1UF,10%,25V,X7R,1206 TK2058 C3216X7R1E104K- - 8- 52 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 243 12061A151KAT1A A5C91 283- - 5004- - 00 CAP,FXD,CERAMIC:MLC;0.1UF,10%,25V,X7R,1206 TK2058 C3216X7R1E104K- - A5C92 283- - 5106- - 00 CAP,FXD,CERAMIC:MLC;470PF,5%,100V,NPO,1206 04222 12061A471JAT1A A5C93 283- - 5068- - 00 CAP,FXD,CERAMIC:MLC;2200PF,10%,50V,X7R,1206 04222 12065C222KAT1A 8- 53 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 244 OHM,Q>40,SRF>8.0 MHZ A5L8 108- - 5015- - 00 INDUCTOR,FXD:SIGNAL;100UH,10%,I<0.11A,RDC<8.0 TK2058 NL453232T- - 101K OHM,Q>40,SRF>8.0 MHZ A5L9 108- - 5015- - 00 INDUCTOR,FXD:SIGNAL;100UH,10%,I<0.11A,RDC<8 TK2058 NL453232T- - 101K .0 OHM,Q>40,SRF>8.0 MHZ 8- 54 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 245 0LUA3 PMBT3904TRL A5Q30 151- - 5001- - 00 XTR,SIG:BIPOLAR,NPN;40V,200MA,300MHZ,AMPL 0LUA3 PMBT3904TRL A5Q31 151- - 5001- - 00 XTR,SIG:BIPOLAR,NPN;40V,200MA,300MHZ,AMPL 0LUA3 PMBT3904TRL A5Q32 151- - 5001- - 00 XTR,SIG:BIPOLAR,NPN;40V,200MA,300MHZ,AMPL 0LUA3 PMBT3904TRL 8- 55 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 246 RES,FXD:THICK FILM;22.1K OHM,1%,0.125W,TC=100 PPM 50139 BCK2212FT A5R35 321- - 5006- - 00 RES,FXD:THICK FILM;100 OHM,1%,0.125W,TC=100 50139 BCK1000FT A5R36 311- - 5039- - 00 RES,VAR:CERMET;1K OHM,25%,0.25W,4MM SQ,TOP ADJ TK2073 G4DT102M 8- 56 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 247 321- - 5022- - 00 RES,FXD:THICK FILM;2.21K OHM,1%,0.125W,TC=100 PPM 50139 BCK2211FT A5R71 321- - 5006- - 00 RES,FXD:THICK FILM;100 OHM,1%,0.125W,TC=100 50139 BCK1000FT A5R72 321- - 5006- - 00 RES,FXD:THICK FILM;100 OHM,1%,0.125W,TC=100 50139 BCK1000FT 8- 57 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 248 RES,FXD:THICK FILM;22.1K OHM,1%,0.125W,TC=100 PPM 50139 BCK2212FT A5R107 321- - 5049- - 00 RES,FXD:THICK FILM;1M OHM,1%,0.125W,TC=100 PPM 57668 MCR18FXEA1M A5R109 321- - 5047- - 00 RES,FXD:THICK FILM;100K OHM,1%,0.125W,TC=100 PPM 50139 BCK1003FT 8- 58 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 249 RES,FXD:THICK FILM;4.75K OHM,1%,0.125W,TC=100 PPM 50139 BCK4751FT A5R144 321- - 5167- - 00 RES,FXD:THICK FILM;221K OHM,1%,0.125W,TC=100 PPM 59124 RK73H2B2213FT A5R145 321- - 5012- - 00 RES,FXD:THICK FILM;332 OHM,1%,0.125W,TC=100 50139 BCK3320FT 8- 59 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 250 321- - 5018- - 00 RES,FXD:THICK FILM;1.0K OHM,1%,0.125W,TC=100 PPM 50139 BCK1001FT A5R183 321- - 5006- - 00 RES,FXD:THICK FILM;100 OHM,1%,0.125W,TC=100 50139 BCK1000FT A5R184 321- - 5010- - 00 RES,FXD:THICK FILM;221 OHM,1%,0.125W,TC=100 50139 BCK221FT 8- 60 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 251 RES,FXD:THICK FILM;1.0K OHM,1%,0.125W,TC=100 PPM 50139 BCK1001FT A5R219 321- - 5048- - 00 RES,FXD:THICK FILM;332K OHM,1%,0.125W,TC=100 PPM 57668 MCR18FXEA332K A5R220 321- - 5006- - 00 RES,FXD:THICK FILM;100 OHM,1%,0.125W,TC=100 50139 BCK1000FT 8- 61 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 252 MC10116FN A5U30 156- - 5136- - 00 IC,MISC:BIPOLAR,MOD/DEMOD;BALANCED 27014 LM1496M A5U31 156- - 5136- - 00 IC,MISC:BIPOLAR,MOD/DEMOD;BALANCED 27014 LM1496M A5Y1 158- - 0270- - 00 XTAL UNIT,QTZ:17.734MHZ,0.001% 33096 CCAT101823 8- 62 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 253 281- - 0864- - 00 CAP,FXD,CERAMIC:MLC;430PF,5%,100V,0.100 X 0.170 04222 SA101A431JAA A6C12 283- - 0672- - 01 CAP,FXD,MICA DI:200PF,1%,500V 09023 CDA15FD201F03 A6C13 283- - 0600- - 01 CAP,FXD,MICA DI:43PF,5%,500V 09023 CDA10ED430J03 8- 63 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 254 281- - 0775- - 01 CAP,FXD,CERAMIC:MCL;0.1UF,20%,50V,Z5U,0.170 04222 SA105E104MAA A6C48 290- - 1311- - 00 CAP,FXD,ALUM:10UF,20%,50V,ESR=1.4 OHM 55680 UPL1H100MDH1TD (100KHZ,20C),5X11MM,105C,5000HRS A6C49 283- - 0597- - 00 CAP,FXD,MICA DI:470PF,10%,300V TK0891 RDM15FD471K03 8- 64 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 255 A6D1 152- - 0269- - 01 DIODE,SIG:VVC;C4=33PF,5%,C4/C20=2 04713 SMV1263- - 1 A6J1 174- - 2747- - 00 CA ASSY,SP,ELEC:2 X 17,28 AWG,1.75 L,RIBBON 53387 174- - 2747- - 00 8- 65 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 256 XTR,SIG:BIPOLAR,NPN;25V,100MA,200MHZ,AMPL 04713 SPS8801RLRP A6R1 322- - 3258- - 00 RES,FXD:METAL FILM;4.75K OHM,1%,0.2W,TC=100 56845 CCF50- - 2- - G4751FT A6R2 322- - 3226- - 00 RES,FXD:METAL FILM;2.21K OHM,1%,0.2W,TC=100 91637 CCF501G22100F 8- 66 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 257 322- - 3162- - 00 RES,FXD:METAL FILM;475 OHM,1%,0.2W,TC=100 PPM 91637 CCF50G475R0F A6R43 322- - 3255- - 00 RES,FXD,FILM:4.42K OHM,1%,0.2W,TC=T0MI,SM BODY 91637 CCF501G44200F A6R44 322- - 3297- - 00 RES,FXD:METAL FILM;12.1K OHM,1%,0.2W,TC=100 91637 CCF501G12101F 8- 67 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 258 322- - 3265- - 00 RES,FXD:METAL FILM;5.62K OHM,1%,0.2W,TC=100 91637 CCF501G56200F A6R87 322- - 3193- - 00 RES,FXD:METAL FILM;1K OHM,1%,0.2W,TC=100 PPM 91637 CCF501G10000F A6R88 322- - 3356- - 00 RES,FXD,FILM:49.9K OHM,1%,0.2W,TC=T0MI,SM BODY 91637 CCF501G49901F 8- 68 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 259 322- - 3281- - 00 RES,FXD:METAL FILM;8.25K OHM,1%,0.2W,TC=100 91637 CCF501G82500F A6R131 322- - 3126- - 00 RES,FXD,FILM:200 OHM,1%,0.2W,TC=T0MI,SMALL BODY 91637 CCF501G200ROF A6R132 322- - 3126- - 00 RES,FXD,FILM:200 OHM,1%,0.2W,TC=T0MI,SMALL BODY 91637 CCF501G200ROF 8- 69 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 260 322- - 3239- - 00 RES,FXD,FILM:3.01K OHM,1%,0.2W,TC=T0MI,SM BODY 91637 CCF501G30100F A6R180 322- - 3260- - 00 RES,FXD,FILM:4.99K OHM,1%,0.2W,TC=T0 91637 CCF501G49900F A6R181 322- - 3318- - 00 RES,FXD:METAL FILM;20K OHM,1%,0.2W,TC=100 PPM 91637 CCF501G20001F 8- 70 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 261 156- - 4135- - 00 IC,LINEAR:BIPOLAR,COMPARATOR;TTL OUT,9NS,LATCH 1ES66 MAX9686BCPA A6U32 156- - 1150- - 01 IC,LINEAR:BIPOLAR,VR;NEGATIVE,- - 5.0V,100MA,4% 27014 LM79L05ACZ/T4 A6U33 156- - 0991- - 02 IC,LINEAR:BIPOLAR,VR;POSITIVE,5.0V,100MA,5% 01295 UA78L05ACLPM 8- 71 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 262 SA101A151JAA A7C36 281- - 0765- - 00 CAP,FXD,CER DI:100PF,5%,100V 04222 SA102A101JAA A7C41 281- - 0775- - 01 CAP,FXD,CERAMIC:MCL;0.1UF,20%,50V,Z5U,0.170 04222 SA105E104MAA A7C42 281- - 0775- - 01 CAP,FXD,CERAMIC:MCL;0.1UF,20%,50V,Z5U,0.170 04222 SA105E104MAA 8- 72 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 263 A7C155 283- - 0649- - 01 CAP,FXD,MICA DI:105PF,1%,500V 09023 CDA15FD(105)F03 A7C156 283- - 0636- - 01 CAP,FXD,MICA DI:36PF,1.%,500V 09023 CDA15ED360G03 A7C162 281- - 0775- - 01 CAP,FXD,CERAMIC:MCL;0.1UF,20%,50V,Z5U,0.170 04222 SA105E104MAA 8- 73 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 264 PNL,0.5- - 28 THD,0.625 H X 0.187 TAIL,W/O A7J83 131- - 3378- - 00 CONN,RF JACK:BNC;50 OHM,FEMALE,RTANG,PCB/REAR 00779 227677- - 1 PNL,0.5- - 28 THD,0.625 H X 0.187 TAIL,W/O 8- 74 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 265 04713 2N3906 A7Q201 151- - 0190- - 00 XTR,SIG:BIPOLAR,NPN;40V,200MA,300MHZ,AMPL 04713 2N3904 A7Q204 151- - 0190- - 00 XTR,SIG:BIPOLAR,NPN;40V,200MA,300MHZ,AMPL 04713 2N3904 A7Q207 151- - 0190- - 00 XTR,SIG:BIPOLAR,NPN;40V,200MA,300MHZ,AMPL 04713 2N3904 8- 75 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 266 91637 CCF501C20000B A7R45 321- - 0210- - 07 RES,FXD:METAL FILM;1.5K OHM,0.1%,0.125W,TC=25 PPM 91637 CMF55116C15000B A7R46 322- - 3258- - 00 RES,FXD:METAL FILM;4.75K OHM,1%,0.2W,TC=100 56845 CCF50- - 2- - G4751FT 8- 76 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 267 91637 CCF501C10000B A7R82 322- - 3222- - 00 RES,FXD:METAL FILM;2K OHM,1%,0.2W,TC=100 PPM 91637 CCF501G20000F A7R83 322- - 3346- - 00 RES,FXD:METAL FILM;39.2K OHM,1%,0.2W,TC=100 91637 CCF50- - 2- - G39201F 8- 77 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 268 RES,FXD:METAL FILM;1K OHM,1%,0.2W,TC=100 PPM 91637 CCF501G10000F A7R134 322- - 3193- - 00 RES,FXD:METAL FILM;1K OHM,1%,0.2W,TC=100 PPM 91637 CCF501G10000F A7R135 322- - 3239- - 00 RES,FXD,FILM:3.01K OHM,1%,0.2W,TC=T0MI,SM BODY 91637 CCF501G30100F 8- 78 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 269 RES,FXD:METAL FILM;10K OHM,1%,0.2W,TC=100 PPM 91637 CCF50G10001F A7R206 322- - 3289- - 00 RES,FXD:METAL FILM;10K OHM,1%,0.2W,TC=100 PPM 91637 CCF50G10001F A7R207 322- - 3277- - 00 RES,FXD,FILM:7.5K OHM,1%,0.2W,TC=T0,SMALL BODY 91637 CCF501G75000F 8- 79 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 270 IC,LINEAR:BIFET,OP- - AMP;DUAL,LOW OFFSET,LOW DRIFT 01295 TL287CP A7U151 156- - 3972- - 00 IC,MISC:CMOS,ANALOG SWI;QUAD SPST,100 OHM,400NS 17856 DG444DJ A7U161 156- - 3972- - 00 IC,MISC:CMOS,ANALOG SW;QUAD SPST,100 OHM,400NS 17856 DG444DJ 8- 80 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 271 FDH9427 A7CR191 152- - 0141- - 02 DIODE,SIG:ULTRA FAST;40V,150MA,4NS,2PF 27014 FDH9427 A7VR4 152- - 0395- - 00 DIODE,ZENER:4.3V,5%,0.4W 04713 1N749ARL A7VR14 152- - 0395- - 00 DIODE,ZENER:4.3V,5%,0.4W 04713 1N749ARL 8- 81 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 272 (CONNECTED @ A3J5 & A7J12,1760- - SERIES ONLY) 174- - 2746- - 00 CA ASSY,SP,ELEC:2 X 20,28 AWG,5.5 L,RIBBON TK2469 174- - 2746- - 00 (CONNECTED @ A3J2 & A7J13,1760- - SERIES ONLY) 8- 82 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 273 Example: ID CONTROL, (ID CONTROL), or /ID CONTROL. Abbreviations are based on ANSI Y1.1- -1972. Other ANSI standards that are used in the preparation of diagrams by Tektronix, Inc. are: Y14.15, 1966 — Drafting Practices. Y14.2, 1973 — Line Conventions and Lettering.
Page 274: Connector
SEE PARTS LIST FOR CIRCUIT BOARD EARLIER VALUES AND OUTLINE SERIAL NUMBER RANGES. PART OF A1 MAIN BOARD INSTRUMENT NAME VERTICAL INPUT SCHEMATIC NAME & NUMBER ASSEMBLY NUMBER COMPONENT LOCATOR GRID 9- 2 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 275 TIME CODE 1 PIX STROBE from LINE RATE CONTROLLER MICROPROCESSOR from INPUT WFM CLAMP LINE RATE CONTROLLER CPLG PULSE DC REST AC/DC ON/OFF SLO/FST FILTER +TIME CODE VERT SELECTION from REMOTE OFFSET - - TIME CODE +Y AUDI from from REMOTE INPUT REMOTE CPLG...
Page 276 1750A-SERIES & 1760-SERIES VECT. SCH SWITCH DEMODULATORS OPTION SC from LINE RATE CONTROLLER 4 FSC OSCILLATOR & DISPLAY LOGIC B- - Y (U) LOW PASS MODE CHROMA FILTER SWITCH GATE HORIZONTAL SIGNAL INTERNAL VECTOR MULTIPLEXER VIDEO 50% Point SYNC CHARGE PUMP CHROMA + from Detector...
Page 277 FIRST IN SYNCHRONOUS F DATA FIRST OUT SWITCHING SYNCHRONOUS MEMORY OUTPUTS (FIFO) VERTICAL, HORIZONTAL, READOUT, Z-AXIS, & DACS DATA BUFFERED DATA (BD) DATA BUFFER VERTICAL READ NON-VOLATILE LINE RATE RANDOM READOUT ONLY CONTROLLER RANDOM ACCESS READOUT MEMORY FLAhSH ACCESS COMPONENT MEMORY STATE SYNC...
Page 278 A4 Input Board Component Locator Chart (with cross-references to schematic diagrams 1 and 2) Comp Diag Diag Comp Diag Diag Comp Diag Diag Comp Diag Diag R100 R101 R102 R103 R104 R105 R106 R107 A4 Input Board Static Sensitive Devices R108 R109 See Maintenance Section...
Page 279 INPUT AMPLIFIERS R105 332.0 39.2 <2> VIDEO_A 1.00K R106 24NH 182.0 EL2090 22.1K 47UF 1.00K 182.0 --- 8V 100PF 15UH AC/DC_SEL <2> .1UF .1UF AC/DC_SEL SLOW/FAST <2> SLOW/FAST CLAMP_PLS DCREST_ON <2> DCREST_ON 1.00M .1UF 1000PF --- 8V AC/DC_SEL 1.00K DG444 18.2K SLOW/FAST <2>...
Page 280 A4A1 BNC Board Component Locator Chart (with cross-references to schematic diagrams 1 and 2) Comp Diag Diag Comp Diag Diag Front of Board Back of Board J100 Static Sensitive Devices A4A1 BNC Board See Maintenance Section Schematic Diagram <2> Component Locator Chart The schematic diagram has an alphanumeric grid to assist in locat- ing parts within that diagram.
Page 281 R101 INPUT AMPLIFIERS 332.0 39.2 VIDEO_B 24NH 1.00K --- 8V R110 EL2090 22.1K 182.0 47UF 1.00K 182.0 .1UF .1UF 100PF 15UH --- 8V CLAMP_PLS .1UF .1UF 1.00M .1UF 1000PF --- 8V AC/DC_SEL 1.00K --- 8V 18.2K SLOW/FAST 6.81K .1UF .1UF 11.0K --- 8V VREF_B...
Page 282 Static Sensitive Devices A3 Main Board --- Front The schematic diagrams have an alphanumeric grid to Board locator chart is on the back of Schematic 3. See Maintenance Section assist in locating parts within that diagram. Schematic Diagram <3> Component Locator Chart Schematic Diagram <4>...
Page 283 ANALOG CONNECTOR EXT_REF <7> INT_VIDEO PIX OUT R298 <4> R299 LTNG_Y 2.74K 22.1K R261 PIX_OUT C149 <4> R300 <11> FLAT GBR_INT <7> PIX_STROBE CLAMP_PLS <7> INPUT MUX R251 CLAMP_PLS 100K <5> LTNG_X <9> R301 --- 8V SLOW/FAST R316 REF_VIDEO 75.0 PIX_OUT VIDEO_A HORIZ REF MUX...
Page 284 A3 Main Board Component Locator Chart (with cross-references to schematic 3, 4, 5, 6, 7, 8, 9, 10, and 11) Comp Diag Diag Comp Diag Diag Comp Diag Diag Comp Diag Diag Comp Diag Diag Comp Diag Diag Comp Diag Diag Comp Diag...
Page 285 VERTICAL DEFLECTION +40V R142 R141 R175 R189 .1UF 332.0 332.0 332.0 332.0 SQUARE WAVE R159 R157 R176 R190 332.0 332.0 332.0 332.0 CALIBRATOR R161 R158 R177 R178 332.0 332.0 332.0 332.0 C177 .1UF R162 R164 R179 R181 332.0 332.0 332.0 332.0 R101 33.2K...
Page 286 Board locator chart is on the back of Schematic 3 A3 Main Board --- Back (integrated with the chart for the front of the board). Schematic Diagram <5> Component Locator Chart Assembly A3. Partial Assembly A3 also shown on Schematics 3, 4, 6, 7, 8, 9, 10, and 11. The schematic diagram has an alphanumeric grid Comp...
Page 287 HORIZONTAL DEFLECTION <7> FLD_RETR +100V U63B DG444 R138 SWEEP GENERATORS 10.0 C101 .1UF HORIZONTAL R136 SIGNAL MUX .1UF 2.74K .1UF R139 R122 R231 R124 82.5K 100K 100K <9> <4> FLD_SWP_SPD PIX_VSWEEP U39A MC34004 U62A MC34002 R201 U63A .1UF DG444 R165 R170 2.21K 2.21K...
Page 288 Schematic Diagram <6> Component Locator Chart The schematic diagram has an alphanumeric grid to assist in locating parts within that diagram. Assembly A3. Partial Assembly A3 also shown on Schematics 3, 4, 5, 7, 8, 9, 10, and 11. Comp Comp Comp Diag...
Page 289 <7> <8> <10> <7> <8> <10> DATA BD[0..15] BA[0..23] BD[0..15] BA[0..23] BUFFERS BD[0..15] MICROPROCESSOR R442 75.0 4.75K FLASH EPROM 27C010 74F245 NOVRAM R443 75.0 PIN128 R444 75.0 28F020 MC68332 DS1225D HM628128 R445 75.0 10UF R446 75.0 .1UF BD10 BD11 R447 75.0 BD12 BA10...
Page 290 Schematic Diagram <7> Component Locator Chart The schematic diagram has an alphanumeric grid to assist in locating parts within that diagram. Assembly A3. Partial Assembly A3 also shown on Schematics 3, 4, 5, 6, 8, 9, 10, and 11. Comp Comp Comp Diag...
Page 291 <6> SYNCHRONOUS BD[0..15] BD[0..15] OUTPUTS BD[0..15] 74HCT574 <11> V_INT_SEL 7201 LINE RATE <11> XO/HF PX_INT_SEL CONTROLLER FD10 <11> W_INT_SEL FD11 <11> RO_INT_SEL FD12 <9> VGAIN_SEL0 BD10 FD10 XC3042 FD13 <9> VGAIN_SEL1 FD10 BD11 FD11 D0--- DIN--- I/O FD14 <9> V_POS_SEL0 FD11 BD12 FD12...
Page 292 Schematic Diagram <8> Component Locator Chart The schematic diagram has an alphanumeric grid to assist in locating parts within that diagram. Assembly A3. Partial Assembly A3 also shown on Schematics 3, 4, 5, 6, 7, 9, 10, and 11. Comp Comp Comp Diag...
Page 293 READOUT CONTROL <6> BD[0..15] BD[0..15] XC3030 /LDAC /SAMPLE /SAMPLE D0--- DIN--- I/O DAC_A0 D1--- I/O BD10 D2--- I/O /SAMPLE BD11 D3--- I/O smpl hold BD12 2.8US 3.6US D4--- I/O BD13 D5--- I/O 6264LFP BD14 D6--- I/O .5US BD15 D7--- I/O <6>...
Page 294 Schematic Diagram <9> Component Locator Chart The schematic diagram has an alphanumeric grid to assist in locating parts within that diagram. Assembly A3. Partial Assembly A3 also shown on Schematics 3, 4, 5, 6, 7, 8, 10, and 11. Comp Comp Comp Diag...
Page 295 D/A CONVERTERS U87A <11> /ADCS1 74HCT125 U39D <6> MISO MISO .1UF MC34004 <11> /ADCS2 74HC595 BMOSI /MN_ID_CS BMOSI U50C /DAC1_CS R338 U87B R108 /MN_ID_LD MC14053 SERIAL <6> <5> 74HCT125 10.0K 100K I10412 BMOSI BSCK /ADCS1 INTERFACE BSCK SCLK H_GAIN U87C 74HCT125 /ADCS2 SCLR...
Page 296 Schematic Diagram <10> Component Locator Chart The schematic diagram has an al- phanumeric grid to assist in locat- ing parts within that diagram. Assembly A3. Partial Assembly A3 also shown on Schematics 3, 4, 5, 6, 7, 8, 9, and 11. Comp Diag C170...
Page 297 RS232 MAX232 /PRESET_7 SERIAL PORT /PRESET_3 C175 C170 22UF /PRESET_4 22UF /PRESET_5 R356 /PRESET_6 4.7K C171 C172 22UF /PRESET_2 22UF /PRESET_1 --- 2 <6> /PRESET_8 /STORE /STAIR_EN 1760---SERIES --- 11 DIGITAL BUS --- 12 CONNECTORS --- 13 /R_SYNC_EN RS232 REMOTE <6>...
Page 298 Schematic Diagram <11> Component Locator Chart The schematic diagram has an alphanumeric grid to assist in locating parts within that diagram. Assembly A3. Partial Assembly A3 also shown on Schematics 3, 4, 5, 6, 7, 8, 9, and 10. Comp Comp Comp Diag...
Page 299 +8V SUPPLY ---8V SUPPLY +11V R290 R289 39.2 39.2 39.2 39.2 .1UF 10UF GRATICULE SKT4 R284 --- 11V --- 8V LIGHTS 10UF 7908ACT --- 11V 7808ACT R145 +11V +11V SKT3 C107 .1UF C136 R146 C139 .1UF 10UF MC34004 +40V <9> 3.32K GRAT_LITES R147...
Page 300 A2 Front Panel Board and Schematic Diagram <12> Component Locator Chart The schematic diagram has an alphanumeric grid to assist in locating parts within that diagram. Assembly A2. Comp Diag Comp Diag Front of Board DS10 DS11 DS12 DS13 DS14 DS15 DS16 DS17...
Page 301 SWITCH TEXT +5V1 +5V1 +5V1 +5V1 +5V1 +5V1 +5V1 +5V1 SWITCH 1740A 1750A 1760 68.1 68.1 68.1 68.1 68.1 68.1 68.1 68.1 WAVEFORM WAVEFORM WAVEFORM/AUDIO LED DRIVERS VECTOR VECTOR VECTOR/SCH WAVEFORM/ PRESET AUDIO MULTIPLE VECTOR/SCH AUDIO SCH/AUDIO LIGHTNING/BOWTIE DS17 DS18 DS20 DS19 DS25...
Page 302 A5 Vector Board Component Locator Chart (with cross-references to Schematics 13, 14, 15, and 16) Comp Diag Comp Diag Diag Comp Diag Diag Comp Diag Diag Comp Diag Diag Diag R108 * R205 R109 R206 R110 R207 R111 R208 C100 R112 R209 C101...
Page 303 U17B 74HCT125 MISO CHROMA AMP I10412 BMOSI R213 REF_CAL BSCK C113 10.0K SCLK VOUT0 .1UF U17A DOT_CAL R215 <16> VOUT1 RY_OFFSET 74HCT125 100.0K /DAC_CS R216 16/4 MODE VOUT2 100.0K /DAC_LD <16> VOUT3 BY_OFFSET R211 3.92K 10.0K C114 VOUT4 R214 .1UF <15>...
Page 304 Schematic Diagram <14> Component Locator Chart The schematic diagram has an alphanumeric grid to assist in locating parts within that diagram. Assembly A5. Partial Assembly A5 also shown on Schematics 13, 15, and 16. Comp Comp Comp Diag Diag Diag R166 R167 R168...
Page 305 1740A/1750A/1760--SERIES...
Page 306 Schematic Diagram <15> Component Locator Chart The schematic diagram has an alphanumeric grid to assist in locating parts within that diagram. Assembly A5. Partial Assembly A5 also shown on Schematics 13, 14, and 16. Comp Comp Comp Diag Diag Diag R115 R116 R117...
Page 307 100.0 R115 681.0 15UH 10PF R154 10.0 10.0K .1UF VCXO R116 .1UF U25A <13> R159 562.0 R111 MC10H131 2.21K 100.0 1.50K /TEST .1UF 1496 R169 R112 U29B <14> 562.0 R117 100.0 68UH 33PF R165 R175 MC10116 150PF 10.0K 10.0K 562.0 11.0K VCC1 ERROR...
Page 308 Schematic Diagram <16> Component Locator Chart The schematic diagram has an alphanumeric grid to assist in locating parts within that diagram. Assembly A5. Partial Assembly A5 also shown on Schematics 13, 14, and 15. Comp Comp Comp Diag Diag Diag C112 1740A/1750A/1760-SERIES...
Page 309 DEMODULATOR OUTPUT CHROMINANCE FILTERS & AMPLIFIERS DEMODULATORS 10.0 100UF 100PF 1.50K 1496 1.00K 100.0 <15> 82UH 392.0 100.0 SUBC 3.92K 100.0 1.00K 1.00K 100.0 120PF .1UF 11.2--- 16.8UH 16.8PF 392.0 100.0 LM6361 1.00K <13> 100PF R--- Y 150PF PAL QUAD PHASE 220PF .1UF 5.62K...
Page 310 A6 SCH Board Component Locator Chart (with cross-references to Schematics 17 and 18) Comp Diag Diag Comp Diag Diag Comp Diag Diag Comp Diag Diag Comp Diag Diag R179 R180 R181 R182 R183 R184 R185 R100 R186 R101 R187 R102 R103 R104 R105...
Page 311 50% POINT DETECTOR +5VREG +5VREG +5VDIG 4700PF 10UF .1UF .1UF .1UF .1UF R143 LM6361 1.21K R146 .1UF 1.21K LF398 2.21K 240PF 100.0 330PF 8 7 4 10UF .1UF .1UF .1UF R167 --- 8V --- 8V 47.5K 1.00K 562.0 0.1% SCH_FIELD R168 1.00K R173...
Page 312 Schematic Diagram <18> Component Locator Chart The schematic diagram has an alphanumeric grid to assist in locating parts within that diagram. Assembly A6. Partial Assembly A6 also shown on Schematic 17. Comp Comp Comp Diag Diag Diag R103 R104 R105 R106 R109 R110...
Page 313 4.75K R129 1.00K .1UF <17> 51PF 2.21K REF_VIDEO R128 3.32K R110 430PF 450PF 1.00K 100.0 BURST 4.75K R111 1.00K 1496P SYNC LOCKED OSCILLATOR 100.0 U22A 200PF 430PF LM393 13.0K 2.21K R103 5.62K 5.62K 240PF 10.0 .1UF 100.0 --- 8V --- 8V R106 4.75K U18A...
Page 314 R122 R123 R119 R159 R158 R160 Static Sensitive Devices See Maintenance Section A7 Component Board Board locator chart is on the back of Schematic 19. Schematic Diagram <19> Component Locator Chart The schematic diagram has an alphanumeric grid to assist in locating parts within that diagram. Assembly A7.
Page 315 39.2K RGB OUTPUT 1.00K INPUT SELECTION BETA RGB TRANSCODER <20> <20> LTNG_Y BETA EL2090 <20> 75.0 GBR_INT 7.5PF 8.25K .1UF <20> LTNG_X 1.00K 100.0 150PF <20> 2.00K 19.6K C408 2.00K .1UF OPT_PLS R408 .1UF 5.11K 4.75K 10.0 --- 8V .1UF U40D .1UF DG444...
Page 316 A7 Component Board Component Locator Chart Schematic Diagram <20> Component Locator Chart (with cross-references to Schematics 19 and 20) Comp Diag The schematic diagram has an alphanumeric grid to assist in locating parts within that Comp Diag Diag Comp Diag Diag Comp Diag...
Page 317 VERTICAL AMPLIFIER U203 U125A 74HC165 74HC32 OPT_PLS OPT_PLS U211A 74HC125 /TOP /TOP OUTPUT SWITCHING MISO C118 .01UF U124D R120 DG444 /OPT_EN 10.0K U101B R119 DG444 <19> R113 10.0K CONTROLLER 1.00K R114 2.74K C120 R112 U126B Q114 U124B .1UF 1.00K LF412ACN R118 DG444 R119...
Page 318 Static Sensitive Devices A1 Power Supply Board See Maintenance Section A1 Power Supply Board Component Locator Chart (with cross-references to Schematics 21 and 22) Comp Diag Diag Comp Diag Diag Comp Diag Diag Comp Diag Diag Comp Diag Diag Comp Diag Diag Comp...
Page 319 CAUTION: ALL CIRCUITRY TO THE MOUNTING LEFT OF THE ISOLATION BOUNDARY IS AT POWER LINE +11V POTENTIAL AND REQUIRES CR16 .022UF CR17 AN ISOLATION TRANSFORMER CR18 TO SERVICE. ISOLATION BOUNDARY R123 CR32 CR33 R117 121K 90--- 250V 100UF NORMALLY .022UF INSTALLED REAR 5 OHM COLD...
Page 320 Schematic Diagram <21> Component Locator Chart The schematic diagram has an alphanumeric grid to assist in locating parts within that diagram. Assembly A1. Partial Assembly A1 also shown on Schematic 22. Comp Diag Comp Diag Comp Diag Comp Diag Comp Diag R117 R118...
Page 321 100UH +100V P320 IS PART OF CRT 10UF 10UF HV OSC & P320 ERROR AMP <11> TRACE 5.5KV P--- P +11KV POST (g7) ROTATION .22UF 33.2K 100K +100V +11A 4.99K .1UF +5VA CR15 (g5) 5.11K 10.0 CR11 +11A .1UF 22.1K 100K (x2) GEOMETRY...
Page 323 100UH +100V P320 IS PART OF CRT 10UF 10UF HV OSC & P320 ERROR AMP <11> TRACE 5.5KV P--- P +11KV POST ROTATION .22UF 33.2K 100.0K +100V +11A WIRE 4.99K .1UF +5VA COLOR CODES CR15 |--- 03| 5.11K 10.0 CR11 +11A .1UF WHITE/BLK/RED...
Page 325 Replaceable Mechanical Parts This section contains a list of the replaceable mechanical components for the 1740A Series, 1750A Series, and 1760 Series monitors. Use this list to identify and order replacement parts. Parts Ordering Information Replacement parts are available through your local Tektronix field office or representative.
Page 326 Items in this section are referenced by figure and index numbers to the exploded view illustrations that follow. Tektronix part number Use this part number when ordering replacement parts from Tektronix. 3 and 4 Serial number Column three indicates the serial number at which the part was first effective. Column four indicates the serial number at which the part was discontinued.
Page 327 4300 S RACINE AVE CHICAGO IL 60609- - 3320 TK1373 PATELEC- - CEM (ITALY) 10156 TORINO VAICENTALLO 62/45S ITALY TK1543 CAMCAR/TEXTRON 600 18TH AVE ROCKFORD IL 61108- - 5181 10- 3 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 328 SCREW,MACH:4- - 40 X 0.5,PNH,STL TK0435 ORDER BY DESC *END MOUNTING PARTS* - - 22 211- - 0027- - 00 SCREW,MACHINE:4- - 40 X 1.5,PNH,STL 3M099 ORDER BY DESC *END MOUNTING PARTS* 10- 4 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 329 343- - 0916- - 00 CLAMP,LOOP:0.5 ID,NYLON 34785 029- - 500 - - 44 343- - 0013- - 00 CLAMP,LOOP; 0.375 ID,PLASTIC SAFETY CONTROLLED 74594 343- - 0013- - 00 10- 5 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 330 426- - 2455- - 00 FRAME,CRT:BEZEL TK1163 426- - 2455- - 00 *MOUNTING PARTS* - - 61 378- - 0258- - 00 FILTER:GRAY,POLYCARBONATE 80009 378- - 0258- - 00 10- 6 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 331 426- - 2096- - 01 B030000 MOUNT,RESILIENT TK1155 426- - 2096- - 01 *MOUNTING PARTS* - - 79 200- - 4042- - 00 B030000 CAP:CRT SOCKET 80009 200- - 4042- - 00 10- 7 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 332 063- - 1670- - 03 B036878 DISK:3.5 INCH,1.44 MEG,PROGRAMMED V2.4 80009 063- - 1670- - 03 063- - 1690- - 00 B029999 DISK:3.5 INCH,1.44 MEG,PROGRAMMED CAL PROCEDURE 80009 063- - 1690- - 00 10- 8 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 333 - - - - - - - - - - - - - - - - - - - - - - UTILITY DRAWER:1700F07 - - - - - - - - - - - - - - - - - - - - - - PLAIN CASE:1700F00 10- 9 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 334 Replaceable Mechanical Parts 10- 10 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 335 Replaceable Mechanical Parts Below B03000 70 71 Figure 10- 1: Exploded View 10- 11 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 336 Replaceable Mechanical Parts 10- 12 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 337 Refers to the 0-IRE level for NTSC systems (0.3-volt level, with respect to sync tip, for PAL systems) which exists before and after horizontal sync and during the vertical interval. Glossary- 1 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 338 The high-frequency portion of the video signal which is obtained by quadrature amplitude modulation of a 3.58 MHz (NTSC) or 4.43 MHz (PAL) subcarrier with R- -Y and B- -Y information. Glossary- 2 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 339 (dc component) are passed through. DC Restorer A circuit used in picture monitors and waveform monitors to clamp one point of the waveform to a fixed dc level. Glossary- 3 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 340 In general, this term refers to any device which recovers the original signal after it has modulated a high-frequency carrier. In television it may refer to: (1) An instrument, such as a TEKTRONIX 1450, which takes video in its transmitted form (modulated onto the picture carrier) and converts it to baseband.
Page 341 Hue is the property of color which allows us to distinguish between colors such as red, yellow, purple, etc. Glossary- 5 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 342 A process which allows signal information to be moved to other frequencies in order to facilitate transmission or frequency-domain multiplexing. See AM and FM for details. Non- -Linear Distortion Refers to distortions which are amplitude-dependent. Glossary- 6 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 343 R- -Y One of the color difference signals is obtained by subtracting luminance (Y) from the red camera signal. Glossary- 7 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 344 The B- -Y signal after a weighting factor of 0.493 has been applied. The weighting is necessary to reduce peak modulation in the composite signal. Glossary- 8 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 345 Abbreviation for luminance. Zero Carrier Reference A pulse in the vertical interval which is produced by the demodulator to provide a reference for evaluating depth of modulation. Glossary- 9 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 346 Glossary Glossary- 10 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 347 Digital-to-Analog Converter, 3- - 6 Blanking Logic (Diagram 11), 3- - 17 Line Rate Controller, 3- - 5 Buffered Output (Diagram 6), 3- - 13 Microprocessor, 3- - 5 Index- 1 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 348 Pulse Width Modulator (Diagram 21), 3- - 33 Diamond, 2- - 26 Readout Control (Diagram 8), 3- - 15 Lightning, 2- - 26 Readout Stroke Generator (Diagram 8), 3- - 15 Index- 2 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 349 Displaying a Signal, 2- - 27 Power Source, 2- - 8 Functional Overview, 2- - 25 Rack Adaptor, 2- - 4 General Menu Information, 2- - 23 Rear Panel Connectors, 2- - 9 Index- 3 1740A Series, 1750A Series, & 1760 Series Service Manual...
Page 350 Remote sync, 2- - 11 Repackaging, 6- - 27 RMA, 6- - 28 RS232 Connector, 2- - 13 Waveform Display, 2- - 26 Web site address, Tektronix, xiv SCH Display, 2- - 25 Index- 4 1740A Series, 1750A Series, & 1760 Series Service Manual...

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