Tektronix 1502B Service Manual
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Tektronix 1502B Service Manual

Metallic time-domain reflectometer
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Summary of Contents for Tektronix 1502B

  • Page 1 T h e t e s t & me a s u r e me n t e q u i p me n t y o u n e e d a t t h e p r i c e y o u w a n t . A l l t e s t I n s t r u me n t s , I n c .
  • Page 2 Service Manual 1502B Metallic Time-Domain Reflectometer 070-6267-04 This document applies for firmware version 5.02 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 4 Certificate of the Manufacturer/Importer Bescheinigung des Herstellers/Importeurs NOTICE to the user/operator:...

  • Page 6: Table Of Contents

    1–1 Preparing to Use the 1502B .........
  • Page 7 Replaceable Mechanical Parts ....... . 10–1 1502B MTDR Service Manual...

  • Page 8: List Of Figures

    ..1–27 Figure 1–33: A Captured Single Sweep ......1–28 1502B MTDR Service Manual...
  • Page 9 ......5–34 Figure 5–19: Column Timing Diagram ......5–35 1502B MTDR Service Manual...
  • Page 10 ....6–22 Figure 6–36: Rising Edge with Scale at 1.0 m /div ....6–22 1502B MTDR Service Manual...
  • Page 11 ......7–10 Figure 7–8: Lithium Battery on Main Board ....7–10 1502B MTDR Service Manual...
  • Page 12 Battery Pack ........10–20 1502B MTDR Service Manual...

  • Page 13: List Of Tables

    ..........7–20 viii 1502B MTDR Service Manual...

  • Page 14: General Safety Summary

    (Earth) Terminal Refer to Manual Power Source This product is intended to operate from a power source that will not apply more than 250 volts RMS between the supply conductors or between the supply conductor and 1502B MTDR Service Manual...
  • Page 15 Do Not Remove Covers or To avoid personal injury, do not remove the product covers or panels. Do not operate Panels the product without the covers and panels properly installed. 1502B MTDR Service Manual...

  • Page 16: Service Safety Summary

    Hazardous Waste guidelines. Check your local and state regulations prior to disposing of an old battery pack. Tektronix Factory Service will accept 1502B batteries for recycling. If you choose to return the battery to us for recycling, the battery cases must be intact, the battery should be packed with the battery terminals insulated against possible short-circuits, and should be packed in shock-absorbant material.
  • Page 17 Service Safety Summary 1502B MTDR Service Manual...

  • Page 18: General Information

    The 1502B generates a half-sine wave signal, applies it to the cable under test, and detects and processes the reflected voltage waveform. These reflections are displayed in the 1502B liquid crystal display (LCD), where distance measurements may be made using a cursor technique.

  • Page 19: Installation And Repacking

    Checks appendix. These checks should satisfy the requirements for most receiving or incoming inspections. Power Source and Power The 1502B is intended to be operated from a power source that will not apply more Requirements than 250 volts RMS between the supply conductors or between either supply conductor and ground.
  • Page 20 If it is necessary to ship the battery, it should be wrapped and secured separately before being packed with the instrument. 2. Install the front cover on the 1502B and surround the instrument with polyethylene sheeting to protect the finish.
  • Page 21 General Information 1502B MTDR Service Manual...

  • Page 23: Operating Instructions

    This procedure is explained in the 1502B Service Manual. The 1502B can be stored in temperatures ranging from –62 C to +85 C. However, if the temperature is below –40 C or above +55 C, the battery pack should be removed and stored separately.
  • Page 24 Operating Instructions The 1502B is intended to be operated from a power source that will not apply more than 250 V RMS between the supply conductors or between either supply conductor and ground. A protective ground connection by way of the grounding conductor in the power cord is essential for safe operation.

  • Page 25: Figure 1-2: Display Showing Low Battery Indication

    If the battery is low, it will be indicated on the LCD (bat/low). If this is the case, protective circuitry will shut down the 1502B within minutes. Switch to AC power, change the battery, or work very fast. If the instrument is equipped with a chart recorder, using the recorder will further reduce the battery level, or the added load might shut down the instrument.

  • Page 26: Preparing To Use The 1502B

    AC only. Low Temperature When operating the 1502B in an environment below +10 C, a heater will activate. Operation The element is built into the LCD module and will heat the display to permit normal operation.

  • Page 27: Display

    Vertical Scale Distance per Division Figure 1–4: Display and Indicators Front-Panel Controls 1. CABLE: A female BNC connector for attaching a cable to the 1502B for testing. 2. NOISE FILTER: If the displayed waveform is noisy, the apparent noise can NOISE FILTER be reduced by using noise averaging.
  • Page 28 A standard instrument defaults to ft/div. A metric instrument (Option 05) defaults to m/div, but either may be changed temporarily from the menu. The default can be changed by changing an internal jumper (see 1502B Service Manual and always refer such changes to qualified service personnel).

  • Page 29: Menu Selections

    Hold can be deactivated by pushing STORE or the mode exited by using the Setup Menu. ii. Pulse Is: On/Off. Turns the pulse generator off so the 1502B does not send out pulses. iii. Single Sweep Is: On/Off. This function is much like a still camera; it will acquire one waveform and hold it.
  • Page 30 When powered up, the instrument will default to feet unless the internal jumper has been moved to the meters position. Instructions on changing this default are contained in the 1502B Service Manual. e. Light Is: On/Off. This control turns the electroluminescent backlight behind the LCD on or off.
  • Page 31 It is possible to connect the instrument to a computer through a parallel interface with a unique software driver. Because different computers vary widely in 1–9 1502B MTDR Service Manual...

  • Page 32: Test Preparations

    It is sometimes expressed as a whole number (e.g., 66) or a percentage (e.g., 66%). On the 1502B, it is the percentage expressed as a decimal number (e.g., 66% = .66). If you do not know the velocity of propagation, you can get a general idea from the following table, or use the Help with Cables section of the Cable Information menu.

  • Page 33: Figure 1-5: Vp Set At .30, Cursor Beyond Reflected Pulse (Set Too Low)

    The following three illustrations show settings too low, too high, and correct for a sample three-foot cable. 3.000 ft Figure 1–5: Vp Set at .30, Cursor Beyond Reflected Pulse (Set Too Low) 3.000 ft Figure 1–6: Vp Set at .99, Cursor Less Than Reflected Pulse (Set Too High) 1–11 1502B MTDR Service Manual...

  • Page 34: Cable Test Procedure

    Figure 1–7: Vp Set at .66, Cursor at Reflected Pulse (Set Correctly) Cable Test Procedure Distance to the Fault Be sure to read the previous paragraphs on Vp. 1. Set the 1502B controls: POWER CABLE Cable to BNC NOISE FILTER...

  • Page 35: Figure 1-9: Short In The Cable

    4. When inspecting a 452-foot cable, a setting of 50 ft/div allows a relatively fast inspection. If needed, turn VERT SCALE to increase the gain. The higher the gain, the smaller the faults that can be detected. If noise increases, increase the NOISE FILTER setting. 1–13 1502B MTDR Service Manual...

  • Page 36: Figure 1-11: 455-Ft Cable

    It is designated by the Greek letter and is written in this manual as rho. The 1502B measures the reflection coefficient in millirho (thousandths of a rho). To measure a reflection, adjust VERT SCALE to make the reflection one division high.

  • Page 37: Figure 1-13: Reflection Adjusted To One Division In Height

    It will show as a downward shift or dip on the waveform. If the cable has an open or short, all the energy sent out by the 1502B will be reflected. This is a reflection coefficient of rho = 1, or +1000 m for the open and –1000 m for the short.

  • Page 38: Figure 1-14: Return Loss

    6. Press MENU twice to return to normal operation. To measure return loss with the 1502B, adjust the height of the reflected pulse to be two divisions high and read the dB return loss directly off the LCD. The incident pulse is set to be two divisions high at zero dB automatically when the instrument is turned on.

  • Page 39: Figure 1-15: Ohms-At-Cursor

    When VIEW INPUT is turned off and no other buttons are pushed, the display will not have a waveform on it (see Figure 1–16, next page). The default condition when the instrument is powered up is to have VIEW INPUT on. 1–17 1502B MTDR Service Manual...

  • Page 40: Figure 1-16: Display With View Input Turned Off

    The VIEW STORE button, when pushed on, displays the waveform stored in the memory as a dotted line. If there is no waveform in memory, a message appears on the LCD informing you of this. 3.000 ft Figure 1–18: Display of a Stored Waveform 1–18 1502B MTDR Service Manual...

  • Page 41: Figure 1-19: Waveform Moved To Top Half Of Display

    3. Move the current waveform (the one you want to compare against the stored waveform) to the center of the display. 4. Push VIEW STORE and the stored waveform will appear above the current waveform. 1–19 1502B MTDR Service Manual...

  • Page 42: Figure 1-20: Current Waveform Centered, Stored Waveform Above

    It might become necessary to disconnect branch lines from the cable under test to determine whether a waveform represents a physical fault or is simply an echo from one of the branches. The STORE and VIEW DIFF functions allow you 1–20 1502B MTDR Service Manual...

  • Page 43: Figure 1-22: Waveform Of Three-Foot Lead-In Cable

    POSITION control to set the cursor where you want to start the distance reading. This will be the new zero reference point. For a three-foot lead-in cable, the cursor should be set at 3.00 ft. 1–21 1502B MTDR Service Manual...

  • Page 44: Figure 1-23: Cursor Moved To End Of Three-Foot Lead-In Cable

    Turn DIST/DIV to .1 ft/div. If the distance reading is extremely high, you might want to use a higher setting initially, then turn to .1 ft/div for the next adjustment. c. Turn the POSITION control until the distance window reads 0.00 ft. 1–22 1502B MTDR Service Manual...

  • Page 45: Figure 1-25: Cursor Moved To 0.00 Ft

    3. Push STORE. 4. Return NOISE FILTER to the desired setting. Notice that the vertical scale now reads 500 m /div. NOTE. The millirho vertical scale will not be in calibration after arbitrarily adjusting the pulse height. 1–23 1502B MTDR Service Manual...

  • Page 46: Figure 1-27: Waveform Of Short 75 Cable

    19.200 ft Figure 1–28: Waveform Centered and Adjusted Vertically 5. Press STORE. 6. Return NOISE FILTER to the desired setting. 7. Adjust the POSITION control to the desired position on the waveform to measure loss. 1–24 1502B MTDR Service Manual...

  • Page 47: Additional Features (Menu Selected)

    Additional Features (Menu Selected) Max Hold The 1502B will capture and store waveforms on an ongoing basis. This is useful when the cable or wire is subjected to intermittent or periodic conditions. The 1502B will monitor the line and display any fluctuations on the LCD.

  • Page 48: Figure 1-30: Waveform Viewed In Normal Operation

    Hold, and push MENU repeatedly until the instrument returns to normal operation. Pulse On/Off This feature puts the 1502B in a “listening mode” by turning off the pulse generator. 1. Attach a cable to the 1502B front-panel CABLE connector. 2. Push MENU to access the Main Menu.

  • Page 49: Figure 1-32: Waveform Display With No Outgoing Pulses

    The input circuitry is very sensitive and can be easily damaged by even moderate level signals. NOTE. In this mode, the 1502B is acting as a detector only. Any pulses detected will not originate from the instrument, so any distance readings will be invalid. If you are listening to a local area network, for example, it is possible to detect traffic, but not possible to measure the distance to its origin.

  • Page 50: Figure 1-33: A Captured Single Sweep

    Figure 1–33: A Captured Single Sweep 8. To exit Single Sweep is: On, access the Acquisition Control Menu again, turn the Single Sweep back off, then repeatedly push MENU until the instrument returns to normal operation. 1–28 1502B MTDR Service Manual...

  • Page 52: Operator Performance Checks

    Operator Performance Checks This chapter contains performance checks for many of the functions of the 1502B. They are recommended for incoming inspections to verify that the instrument is functioning properly. Procedures to verify the actual performance requirements are provided in the 1502B Service Manual.
  • Page 53 If the instrument fails this check, it must be repaired before any distance (Timebase) Check measurements can be made with it. 1. Turn the 1502B power on. The display should look very similar to Figure B–1. 0.000 ft Figure 2–1: Start-up Measurement Display 2.
  • Page 54 10.000 feet (< 3.1 m). 8. Set the DIST/DIV control to .1 ft/div (0.025 m/div). 9. Turn the POSITION control counterclockwise until the distance window shows a distance of –2.000 feet (–0.611 m). 2–3 1502B MTDR Service Manual...
  • Page 55 Figure 2–6: Waveform Off the Top of the Display 2. Using the POSITION control, verify that the entire waveform can be moved to the very bottom of the display (to the bottom graticule line). 2–4 1502B MTDR Service Manual...
  • Page 56 5. Press MENU again. 6. Using the POSITION control, select Service Diagnostic Menu. 7. Press MENU again. 8. Using the POSITION control, select Noise Diagnostics. 9. Press MENU again and follow the instructions on the display. 2–5 1502B MTDR Service Manual...
  • Page 57 2. Set the DIST/DIV control to 5 ft/div (1 m/div). 3. Increase the VERT SCALE control to 50 m /div. 4. Using the POSITION control, move the top of the pulse to the center graticule line. 2–6 1502B MTDR Service Manual...
  • Page 58 10 feet past the rising edge of the pulse. To verify distances past the right edge of the display, scroll along the waveform by turning the POSITION control clockwise. 2–7 1502B MTDR Service Manual...
  • Page 59 Figure 2–11: Waveform Centered, Cursor at 0.000 ft 7. Risetime Check If the risetime is out of specification, it might be difficult to make accurate short-distance measurements near the front panel. 1. Set the 1502B front-panel controls: NOISE FILTER 1 avg VERT SCALE...
  • Page 60 1. Set the VERT SCALE less than or equal to 1.0 mr/div. 2. Watch the leading edge of the pulse move and verify that this movement is less than five pixels, or < 0.02 ft (0.006 m). 2–9 1502B MTDR Service Manual...
  • Page 61 If you suspect a problem of this nature, you should have the instrument checked by a qualified service technician, using the diagnostics in the 1502B Service Manual. If the instrument passed all of the previous checks, it is ready for use.

  • Page 63: Specifications

    1% of distance measured, For delta mode measurements whichever is greater Error 0.5% for distance 27 ft Error 1.0% for distance 14 ft Error 2.0% for distance 7 ft Error 10% for distance 1.5 ft (continued next page) 3–1 1502B MTDR Service Manual...
  • Page 64 Within Included in total timebase error tolerance Custom Option Port Tektronix Chart Recorders YT–1 and YT–1S are designed to operate with the 1502B. Produces a high resolution thermal dot matrix recording of waveform and switch values. Line Voltage 115 VAC (90 to 132 VAC) 45 to 440 Hz, or Fused at 0.3 A...

  • Page 65: Environmental Characteristics

    Withstand 48 hours, 20% solution without corrosion Sand and Dust Operates after test with cover on, non-operating MIL–STD–810, Method 510, Procedure I Washability Capable of being washed Fungus Inert Materials are fungus inert (continued next page) 3–3 1502B MTDR Service Manual...

  • Page 66: Physical Characteristics

    Height 5.0 inches (127 mm) Width with handle 12.4 inches (315 mm) without handle 11.8 inches (300 mm) Depth with cover on 16.5 inches (436 mm) with handle extended to front 18.7 inches (490 mm) 3–4 1502B MTDR Service Manual...

  • Page 68: Options And Accessories

    Options and Accessories The following options are available for the 1502B MTDR: Option 03: Battery Pack Option 03 instruments come equipped with a rechargeable nickel-cadmium battery pack. Battery Pack Removal and Replacement CAUTION. Read the instructions in the front of this manual concerning safety precautions necessary when charging, removing, or servicing the battery pack.

  • Page 69: Option 07: Yt-1S Chart Recorder

    Power Cord Options The following power cord options are available for the 1502B TDR. Note that these options require inserting a 0.15 A fuse in the rear panel fuse holder. NOTE. The only power cord rated for outdoor use is the standard cord included with the instrument (unless otherwise specified).
  • Page 70 ........017–0090–00 These adapters should be purchased if GR connectors (017–0063–00 and/or 017–0064–00) are purchased. 4–3 1502B MTDR Service Manual...
  • Page 71 Options and Accessories 4–4 1502B MTDR Service Manual...
  • Page 72 WARNING The following servicing instructions are for use only by qualified personnel. To avoid injury, do not perform any servicing other than that stated in the operating instructions unless you are qualified to do so. Refer to all Safety Summaries before performing any service.

  • Page 74: Circuit Descriptions

    The 1502B instrument is comprised of several subsections, as shown in the block diagram (Figure 5–1). These are organized as a processor system, which controls several peripheral circuits to achieve overall instrument performance.

  • Page 75: Power Supply

    Digital Bus Main Board Timebase Digital Analog Signal Processing Decoding Offset Gain A/D converter Option Port Power Bus Power Supply Control AC to DC DC to DC Converter Converter Battery Figure 5–1: System Block Diagram 5–2 1502B MTDR Service Manual...
  • Page 76 Cursor and readout display data is determined by the processor and combined with the formatted sample waveform before it is sent to the display. 5–3 1502B MTDR Service Manual...
  • Page 77 EMI filter. The filtered line voltage is immediately fused, routed through a line selector switch and applied to a stepdown transformer. The transformer secondary voltage is rectified and power switched to power the post regulator. 5–4 1502B MTDR Service Manual...
  • Page 78 Power Supply Board. The MOV (R101), across one of T201’s primaries, protects the power supply if 220 VAC is applied while S2011 is in the 110 VAC position. Fuse F101 will open in this event. 5–5 1502B MTDR Service Manual...
  • Page 79 U1020A and Q2010 turn off, allowing C2011 to charge to the input voltage and turn off Q2011 and Q2012. When turned off, the deep discharge protection circuit limits current drawn from the battery pack to only a few microamperes. 5–6 1502B MTDR Service Manual...
  • Page 80 R2030 provides a discharge path from C2031. T1031 and C1036 provide additional filtering of the +16 VDC supply. Processor System Introduction The processor system consists of the following: Microprocessor Address Decoding and Memory Interrupt Logic 5–7 1502B MTDR Service Manual...
  • Page 81 CMOS logic. Each data word, or byte, is eight bits wide and the microprocessor has a 16-bit address capability, allowing it to address up to 65,536 memory locations. The processor’s 5 MHz clock is derived from a crystal oscillator in the timebase circuits. 5–8 1502B MTDR Service Manual...
  • Page 82 It is selected by the seventh decode of U1022. It occupies locations COOOH to DFFFH. Enable and Select Signal The remaining addressable space is used to generate enable, select, or trigger Space signals, which read, write, and control other circuits of the instrument. The eighth 5–9 1502B MTDR Service Manual...

  • Page 83: Display Module

    The processor system outputs six control signals to the Driver/Sampler module. These signals are loaded from the data bus into latch U3010 by a select signal from the address decoder. These signals are used by the 1502B Driver/Sampler and the Option 06 adapter (if equipped).
  • Page 84 This port has a unique protocol that must be followed for proper and safe operation. Further information can be obtained by contacting your Tektronix customer service representative. A block diagram of the option port interface is shown in Figure 5–5.
  • Page 85 R-T TRIG is also available at the interface. This is the trigger pulse generated in the analog timebase. Option Port Wiring Configuration J2010 Option Port Label (on Main Board) (D-Connector) ’ ’ ’ ’ RD’ WR’ CS22 5–12 1502B MTDR Service Manual...

  • Page 86: Video Processor

    Vertical position information is loaded by the processor system into a DAC to generate a DC signal. Sampled video is combined with this vertical position DC voltage in a summing amplifier in order to allow vertical positioning of the displayed waveform. 5–13 1502B MTDR Service Manual...
  • Page 87 0 to 1.75 dB in 0.25-dB steps. Gain of each of the three amplifier stages is controlled by the processor system by loading latch U2044 with the appropriate 8-bit word from the data bus. Digital word 5–14 1502B MTDR Service Manual...
  • Page 88 Digital counters determine the delay in 50 ns multiples, and analog circuits further define the delay to fractions of that period. A block diagram of the timebase circuits is shown in Figure 5–8 (next page). 5–15 1502B MTDR Service Manual...
  • Page 89 A programmable digital counter, clocked at 2.5 MHz, is used to determine the PRT (pulse repetition time) of the driver/sampler test pulse. The 1502B is programmed with a PRT of 350 s. The output of the PRT counter is used to trigger a delay counter, also clocked at 2.5 MHz, to provide coarse (400-ns resolution) digital time...
  • Page 90 The output of the PRT counter, waveform (a), begins the coarse delay (b). The falling edge of this signal triggers the driver strobe (c), which causes a pulse to be applied to the cable test output. 5–17 1502B MTDR Service Manual...
  • Page 91 The processor adjusts the reference for the timebase DAC so as to sample at the previous level. This matches the analog delay to the 50-ns period of the clock. 5–18 1502B MTDR Service Manual...
  • Page 92 50 ns 20 MHz CLK TP2031 PULSE TRIG DIGITAL DELAY START PULSE VAR. DELAY RAMP COMPARATOR LEVEL SET TO SET DELAY ZERO SO SAMPLE TAKEN AT 10% POINT ON OUTPUT PULSE TRIG TO PULSE GEN. TP9011 PULSE OUT 10% LEVEL 4V = 50ns DELAY TRIG TO SAMPLER...
  • Page 93 Q9021. The trigger is capacitively coupled through C8022 and R9027 to shift it to analog levels. The collector of Q9021 is clamped to –0.5 VDC between pulses by CR8020 and rises to +6 VDC peak during the 25 ns pulse. This signal is applied 5–20 1502B MTDR Service Manual...
  • Page 94 The ramp voltage is AC-coupled to voltage comparator Q7021 by C7030 to remove the DC offset voltage developed in the preceding circuits. A small negative DC voltage of approximately –200 mV is added by voltage divider R7032 and R7025 to hold the voltage comparator off between pulses. 5–21 1502B MTDR Service Manual...
  • Page 95 An elapsed time indicator, M1030, is provided to measure the cumulative time the instrument has been turned on. A small bead travels in the indicator as current flows through it, indicating the time during which the instrument has been operating (from 5–22 1502B MTDR Service Manual...
  • Page 96 U1050A. The strobe signal for the FET can be observed at TP2060, and the inverted video output at TP1060. The signal from the second sampler buffer, U2050A, is also fed to the bridge bias amp, U1070, via R1060. 5–23 1502B MTDR Service Manual...
  • Page 97 The 12 V supplies enter the board as 15 V, so the necessary filtering and regulation is accomplished by U3070 and associated circuitry. The +0.6 V supply is used by the hybrid to set 5–24 1502B MTDR Service Manual...
  • Page 98 NOR gate latches U3021, U3022, and U3023 to +5 VDC, setting the latches. The latches are reset by control signal ADCRD. The processor updates the instrument configuration by periodically reading the state of the latches through multiplexers U2024, U3025, and U3031. 5–25 1502B MTDR Service Manual...
  • Page 99 To LCD Heater LCD Heater VERTICAL Drive Circuitry SCALE Resistive Shaft Encoder To LCD Drivers LCD Drive Voltage Circuitry To EL Backlight Switching Power Circuitry Supply 50 - Pin Connector Figure 5–13: Front Panel Block Diagram 5–26 1502B MTDR Service Manual...
  • Page 100 The control signal TRIG ADC is used to start a conversion; ADC RD reads the value; and A , and A select one of the eight channels for conversion. Control signal EOC notifies the processor of a conversion completion, via the IR3 line. 5–27 1502B MTDR Service Manual...
  • Page 101 DAC. In this manner, the drive voltage is compensated due to variations in display temperature. Trimmer potentiometer R1011 is used to offset the drive voltage produced by U2010A to compensate for variations in display cells and thermistors. 5–28 1502B MTDR Service Manual...
  • Page 102 The row and column drivers are attached electrically to the LCD cell through elastomeric connectors and 5–29 1502B MTDR Service Manual...
  • Page 103 LCD Cell The LCD cell provided in the 1502B uses an advanced technology known as Superbirefringent Effect (SBE) to obtain greatly improved contrast and viewing angle over conventional LCD cells. The function of the LCD module is to receive bit pattern data from the CPU and display it.
  • Page 104 N.C. 64 - BIT SHIFT REGISTER LATCH 64 - BIT LATCH Vccd 64 - BIT LEVEL SHIFTER ROW 64 - ROW 128 ROW 1 - ROW 65 Figure 5–16: Row Driver Block Diagram 5–31 1502B MTDR Service Manual...
  • Page 105 ST <start pulse>: Input to the shift register <Din on SED 1190> LP <latch pulse = LATCH>: Falling-edge triggered, this shifts data in the shift register and latches contents of the shift register into the latch <Y S SED 1190> 5–32 1502B MTDR Service Manual...
  • Page 106 XSCL <column (X) shift clock>: Shifts D3–D0 in parallel groups of four bits LP <latch pulse>: Latches data in shift register into 64-bit latch FR <frame signal>: Defines select and non-select voltages <enable in>: Input to the enable flip-flop <enable clock>: Clocks E into the enable flip-flop. 5–33 1502B MTDR Service Manual...
  • Page 107 Circuit Descriptions 1 Frame = 8 ms 63 64 1 2 3 63 64 V LDC Scanning select pulse V LDC X–LP V LDC Figure 5–18: Row Timing Diagram 5–34 1502B MTDR Service Manual...
  • Page 108 Third Column Forth Column Driver Pair Driver Pair Driver Pair Driver Pair Enable Enable Enable Enable 64-LP +5V (Select Bits) (Non Select Bits) (Non Select Bits) Vlcd (Select Bits) One Frame Figure 5–19: Column Timing Diagram 5–35 1502B MTDR Service Manual...
  • Page 109 The process of filling the column drivers is repeated every LP (i.e., for every addressed row until all lines in both screen halves have been refreshed). One frame is thus complete and the entire process is repeated. 5–36 1502B MTDR Service Manual...
  • Page 110 AC select voltage. These signals are generated by the controller as shown in the row driver timing diagram (Figure 5–18). The controller, running at a clock rate of 0.625 MHz, generates ST, LP, and FR with the following periods: 8 ms 125 s 16 ms 5–37 1502B MTDR Service Manual...
  • Page 111 MA12 – MA0 can have one of two sources. The first is an internal address in the controller, which is the address of the currently accessed bit pattern data byte. The second is the address resent on the second address bus, A11 – A0. 5–38 1502B MTDR Service Manual...
  • Page 112 Read and Write for Internal Register Timing PRAM on RAM on RAM Read Data from Write Data to Read Data from Display Memory Display Memory Display Memory to CPU from CPU to Controller Figure 5–21: CPU and Display Memory Interface 5–39 1502B MTDR Service Manual...
  • Page 113 CAUTION. The pads for the EL backlight are exposed when the display module is removed from the front panel. They operate from a high voltage source. Do not turn on the backlight when the pads are exposed. 5–40 1502B MTDR Service Manual...
  • Page 114 +16 VDC, the heater dissipates about 4W. The circuitry to control the temperature is located on the Front Panel Board. The thermistor leads are attached to pads on the Row Driver/Controller Board, similar to the heater, and routed through the 40-pin connector. 5–41 1502B MTDR Service Manual...
  • Page 115 Circuit Descriptions 5–42 1502B MTDR Service Manual...
  • Page 117 Option 05 (metric) instruments default to m/div instead of ft/div. You can change this in the Setup menu, or you may use the metric numbers provided. To change the readings to ft/div, press the MENU button. Scroll down to Distance/Div is: m/div 6–1 1502B MTDR Service Manual...
  • Page 118 1. Pull the POWER switch on the front panel. If a message does not appear on the display within a few seconds, turn the instrument off. If start–up assistance needed, Push MENU button. 1502B ROM version 5.02 Ethernet Copyright 1992 Tektronix Redmond, OR Figure 6–1: Typical Start-Up Display...
  • Page 119 3,000 hours of use. NOTE. If the EL Backlight is dim or does not work properly, refer to the Troubleshooting section or the EL Backlight Replacement section in the Maintenance chapter of this manual. 6–3 1502B MTDR Service Manual...
  • Page 120 Cable Information Menu Setup Menu Diagnostics Menu View Stored Waveform Settings Option Port Menu Move Position to select, then push MENU button Figure 6–4: Main Menu 5. Press MENU. This will display the Diagnostics Menu. 6–4 1502B MTDR Service Manual...
  • Page 121 5. Rotate NOISE FILTER counterclockwise to VERT SET REF. The switch reading on the display should be 5. 6. Slowly rotate this control clockwise to its far stop. Each position should increase the switch reading one count, starting at 5 and ending with 14. 6–5 1502B MTDR Service Manual...
  • Page 122 10 while the higher number is between 245 and 255. Front Panel Diagnostic, test all switches. Hold down MENU button to Exit. Switch: 35 temp: 82 Corresponding Vp: 0.99 Numbers Control Bar Graph Control Vertical Scale Figure 6–8: Front Panel Diagnostic Display 6–6 1502B MTDR Service Manual...
  • Page 123 If the instrument fails this check, it must be repaired before any distance measurements are made with it. 1. Set the front-panel controls: CABLE No connection (see text) NOISE FILTER 1 avg VERT SCALE 500 m DIST/DIV .1 ft/div 6–7 1502B MTDR Service Manual...
  • Page 124 Figure 6–11: Display with 3-ft Cable and Stored Waveform 7. Using the POSITION control, set the cursor on the rising edge of the waveform at the first graticule up from the centerline. 8. Press STORE. 6–8 1502B MTDR Service Manual...
  • Page 125 3-ft cable. The measured distance should be between 2.87 and 3.13 feet. 2.988 ft Figure 6–14: Cursor on Rising Edge of Pulse 12. Remove the 3–ft cable and connect the 50 terminator. 6–9 1502B MTDR Service Manual...
  • Page 126 POSITION control so the distance window reads –2.000 ft. 3. Use the POSITION control to center the baseline before the incident pulse. 4. Increase VERT SCALE to 10 m using the POSITION control to keep the baseline centered on the display. 6–10 1502B MTDR Service Manual...
  • Page 127 Max Hold can be used to easily monitor any changes, as shown below. –2.000 ft Figure 6–18: Incident Pulse at –2.000 ft with Max Hold 7. Turn the instrument OFF, then ON again. This will reset it for the next check. 6–11 1502B MTDR Service Manual...
  • Page 128 Figure 6–19: Waveform at Top of the Display 4. Using the POSITION control, verify that the entire waveform can be moved to the very bottom of the display. The top of the pulse should be lower than the center graticule line. 6–12 1502B MTDR Service Manual...
  • Page 129 A great deal of noise reduction is available with the NOISE FILTER control. 1. Set the front-panel controls: CABLE 50 terminator NOISE FILTER 1 avg VERT SCALE 500 m DIST/DIV 10 ft/div 6–13 1502B MTDR Service Manual...
  • Page 130 6. Press MENU. 7. Using the POSITION control, scroll to Diagnostics Menu. 8. Press MENU again. 9. Using the same procedure, select Service Diagnostic Menu, then Noise Diagnostic. 10. Read the results on the display. 6–14 1502B MTDR Service Manual...
  • Page 131 Diagnostic and follow the directions shown on the display. Exit Service Diagnostic Menu Sampling Efficiency Diagnostic Noise Diagnostic Impedance Diagnostic Offset/Gain Diagnostic RAM/ROM Diagnostics Timebase is: Normal – Auto Correction Move Position to select, then push MENU button Figure 6–25: Service Diagnostic Menu 6–15 1502B MTDR Service Manual...
  • Page 132 If the instrument fails this check, various functions might be affected. Without the RAM/ROM functions operating correctly, it is doubtful you would have gotten this far. This check will give you assurance that the RAM/ROM circuits are operating properly. 6–16 1502B MTDR Service Manual...
  • Page 133 If the aberrations are out of spec, the ohms-at-cursor function might be less accurate than specified. 1. Set the front-panel controls: CABLE 50 terminator NOISE FILTER 1 avg VERT SCALE 500 m DIST/DIV 5 ft/div 2. Using the POSITION control, adjust the distance window to read –2.000 ft. 6–17 1502B MTDR Service Manual...
  • Page 134 7. Move the cursor to 0.000 ft with the POSITION control. All the aberration except the one under the cursor should be within one division of the center graticule line (see Figure 6–30, next page). 6–18 1502B MTDR Service Manual...
  • Page 135 1. Set the front-panel controls: CABLE 50 terminator NOISE FILTER 1 avg VERT SCALE 500 m DIST/DIV 0.1 ft/div –0.316 ft Figure 6–31: Incident Pulse at Center of Display 6–19 1502B MTDR Service Manual...
  • Page 136 POSITION control, set the cursor to the point where the upper portion of the pulse’s rising edge crosses a major horizontal graticule line (should be about half a division from the top of the pulse). 6–20 1502B MTDR Service Manual...
  • Page 137 CABLE 50 terminator NOISE FILTER 1 avg VERT SCALE 500 m DIST/DIV .1 ft/div 2. Using the POSITION and the POSITION controls, center the rising edge of the pulse on the center horizontal graticule line. 6–21 1502B MTDR Service Manual...
  • Page 138 Setup menu. This function can simplify this measurement for you by displaying jitter accumulating. See the Operator chapter for directions on using Max Hold. –1.316 ft Figure 6–37: Rising Edge with Max Hold on 6–22 1502B MTDR Service Manual...
  • Page 139 Option 05: Metric Default Check Option 05 requires no check other than to turn on the instrument and see if it displays in meters. Instructions for changing the default can be found in the Maintenance chapter of this manual. 6–23 1502B MTDR Service Manual...
  • Page 140 If your instrument has this adjustment, it has been set at the factory and requires no further attention. Power Supply Module Power Supply Board Driver/Sampler Board Main Board Figure 6–39: Circuit Board Locations in the Instrument 6–24 1502B MTDR Service Manual...
  • Page 141 1 ft/div (4th stop CW) 2. Make sure the POWER switch is in the OFF position. 3. Connect the 115 VAC output of the Variac into the AC socket on the rear of the 1502B. 6–25 1502B MTDR Service Manual...
  • Page 142 R1010 C1011 U1020 – R1013 VR1012 CR1010 C1012 R1017 C1014 C1013 R1022 R1023 R1018 Q1010 R1014 C1015 TP1010 Q1011 U1021 CR1011 C1016 L1010 Q1012 C2013 C2010 Figure 6–41: Power Supply Test Points TP1020 and TP1010 6–26 1502B MTDR Service Manual...
  • Page 143 Main Board. J5040/P5040 is the input from the power supply. The other end of the cable is J1030/P1030 on the Power Supply Board. Measure the voltages on the pins listed in the table and verify the supply voltages. 6–27 1502B MTDR Service Manual...
  • Page 144 6. Move the positive (+) probe to the +16.2 VDC supply (TP2030) 7. Reduce the Variac output voltage until the +16.2 VDC (and the instrument) shut down. This voltage must be lower than 90 VAC. 6–28 1502B MTDR Service Manual...
  • Page 145 CR2021 Figure 6–45: Power Supply Test Point TP2030 8. Raise the Variac output voltage to 120 VAC. The instrument should remain shut down. 9. Turn the 1502B POWER off. Main Board 12 VDC Check and Adjust Main Board Figure 6–46: Location of Main Board in Instrument +12 VDC Test points in this check are located on the Main Board.
  • Page 146 You might have to adjust R1018 (Contrast Adjust) on the Front Panel Board to get a clear display (see LCD Check and Adjustments in this section). DC Power Check 1. Turn the POWER off. 2. Remove the AC plug from the rear panel of the instrument. 6–30 1502B MTDR Service Manual...
  • Page 147 Power Supply Board Figure 6–49: Battery Pack Port Jacks on Frame The following test points are located on the Power Supply Board. U2010 CR2015 CR2011 TP2010 CR2012 (+) CR2012 Figure 6–50: CR2012 on Power Supply Board 6–31 1502B MTDR Service Manual...
  • Page 148 7. Connect the negative (–) probe to ground. 8. Turn the 1502B POWER on. The instrument should initialize and go into normal operation. The display will be normal except ac in the upper left corner will have changed to bat.
  • Page 149 NOTE. The charging current will vary according to the level of charge already on the battery. With a fully charged battery, the voltage across R2012 should be approximately 0.4 VDC. With a battery below 11 Volts, R2012 should read approximately 1.2 VDC. 6–33 1502B MTDR Service Manual...
  • Page 150 2. Remove the cover of the Driver/Sampler Board (see Maintenance chapter). TP1030 TP1020 TP1021 C1020 T1020 U1010 C2021 C2020 C2010 C2022 C2025 R3032 C2023 C2026 C2024 R3033 TP3020 C2031 C3010 C3011 Figure 6–55: TP1030 on Driver/Sampler Board 6–34 1502B MTDR Service Manual...
  • Page 151 Ä Ä Ä Ä Ä Ä Ä Ä Ä Ä Ä Ä Ä Ä Ä Ä Ä Ä Ä Ä Ä Ä Ä Ä Ä Ä Ä Ä Ä Ä Ä Ä Ä Ä Figure 6–57: LCD Pattern with Contrast Too Light 6–35 1502B MTDR Service Manual...
  • Page 152 1 – 11), then cycle the power off, then back on again to return it to default settings. c. While a waveform is on the display, adjust R1018 on the Front Panel Board counterclockwise until most of the display has dimmed. 6–36 1502B MTDR Service Manual...
  • Page 153 Turn the instrument off. h. After waiting a few seconds, turn the instrument back on. Reinspect the display for bleeding or fading. Readjust R1018 if necessary. 0.000 ft Figure 6–61: Waveform with Contrast Adjusted Correctly 6–37 1502B MTDR Service Manual...
  • Page 154 5. Adjust the POSITION control to center the baseline on the center horizontal graticule line (see Figure 6–63, next page). 6. Set the front-panel controls: CABLE no connection NOISE FILTER 1 avg VERT SCALE 10 m DIST/DIV 0.2 ft/div 6–38 1502B MTDR Service Manual...
  • Page 155 TP106 R1042 U1050 C1041 Q1060 U2050 C2051 J3040 Figure 6–64: R1042 on Driver/Sampler Board 10. Remove the 3-foot precision cable. 11. Verify that the waveform moves less than 0.5 division. 6–39 1502B MTDR Service Manual...
  • Page 156 1. If the instrument is Option 05 (metric), refer to the Maintenance chapter to return the metric default jumper to its proper position. 2. Reinstall the 1502B in its case (refer to the Maintenance chapter of this manual). Care should be taken to follow the directions to maintain watertight integrity of the case.
  • Page 158 Please refer to schematics for physical location of circuits and components. NOTE. We recommend that service be performed at an authorized Tektronix Service Center or by a technician skilled in sampling and pulse techniques.
  • Page 159 Maintenance The interior of the 1502B is protected from dirt and dust as long as the option port and case are intact. However, if interior cleaning is necessary, blow off accumulated dust with low-pressure air and remove the remaining dirt with a soft brush, cotton swab, or pipe cleaner moistened with isopropyl alcohol.
  • Page 160 Check the desiccant cartridge mounted on the rear of the chassis, inside the case. If Cartridge the crystals of silica seen through the window of the cartridge are blue, the dehydrating agent is active and no further maintenance is required. B037562 only) 7–3 1502B MTDR Service Manual...
  • Page 161 3. Heat the cartridge in an oven at approximately 350 F until the blue color is restored to the crystals. 4. Place the cartridge in an air-tight moisture-proof container until it is cool. 5. When cool, replace the cartridge in its brackets. 7–4 1502B MTDR Service Manual...
  • Page 162 2. Remove the screw and washer located below the power switch on the instrument side panel (Figure 7–3, 7) 3. Remove the screw and washer holding the power supply module to the bottom chassis (Figure 7–3, 4). 7–5 1502B MTDR Service Manual...
  • Page 163 NOTE. When reassembling, add a small amount of LocTite to the two transformer mounting screws in step 6. Removing the Power Cord 1. Remove the power supply module, circuit board, and transformer per previous Receptacle procedures. 7–6 1502B MTDR Service Manual...
  • Page 164 The negative (–) plug sequence is: plug, solder lug (the other side of the capacitor), plastic shouldered washer, and on the other side of the chassis wall, the nut. 7–7 1502B MTDR Service Manual...
  • Page 165 Main Board to the chassis. 5. Remove the Main Board, taking care to avoid binding on the power switch mechanical linkage. NOTE. One of the corner screws (see Figure 7–5, next page) holds a ground strap connector. 7–8 1502B MTDR Service Manual...

  • Page 166: Elapsed Time Indicator (Sn

    1. To replace, unsolder both ends and remove. 2. Insert a new timer and re-solder. Reversal 1. Unsolder both ends of the timer and remove it from the board. 2. Reverse the direction it was mounted previously and re–solder. 7–9 1502B MTDR Service Manual...
  • Page 167 1. Remove the Main Board as described in a previous procedure. Unsolder here Lithium Cell Unsolder here Figure 7–8: Lithium Battery on Main Board 7–10 1502B MTDR Service Manual...
  • Page 168 4. Install a new battery and solder the leads to the Main Board. Be sure that the new battery is one that is supplied or authorized by Tektronix. An improper replacement cell could cause irreversible damage to the Main Board circuitry.
  • Page 169 1. Remove the four hex nuts (two are shown in Figure 7–10, next page) that hold Module the Display Module to the Front Panel Board. 2. Disconnect the ribbon cable from the boards. 3. Carefully separate the Display Module from the Front Panel Board. 7–12 1502B MTDR Service Manual...
  • Page 170 3. From the bottom side of the instrument, peer into the space between the Main Board and the Front Panel Board. The default jumper is located behind the screw that holds the Front Panel Assembly to the front-panel mounting stud. 7–13 1502B MTDR Service Manual...
  • Page 171 The following troubleshooting flow charts (starting on page 7–17) are designed to give you an idea where to start. The Circuit Descriptions and Schematics chapters will give further assistance toward solving the problem. 7–14 1502B MTDR Service Manual...
  • Page 172 For example, TP7010 on the flow chart shows the detail of the pulse, but the same test point in the following figures shows the repetition rate. Set the 1502B front-panel controls: CABLE Attach 3-ft cable...
  • Page 173 Maintenance 20nS 100uS Figure 7–15: Main Board TP6010 Main Board TP7010 50uS 100uS 500mV Figure 7–16: Main Board TP9011 Main Board TP9041 Figure 7–17: Front Panel CABLE Connector 7–16 1502B MTDR Service Manual...
  • Page 174 Set Front Panel controls: CABLE Attach 3-ft cable NOISE FILTER 1 avg (3rd position CW) DIST/DIV 1 ft/DIV (4th position CW) START Troubleshooting Chart - Case Off Check Power Supply Display clearly Good Is waveform and Instrument responds Go to +/–5V, +/–15V, +16.2V shows text measurements normal?
  • Page 175 Check ramp trigger TP3041 on main board with scope. Good Check video amp. Check sampler on Check analog delay Check digital delay Check pulser on front end board on main board. on main board. front end board. 7–18 1502B MTDR Service Manual...
  • Page 176 Check for < 4 volts TP4020 and TP4021 on main board. Check digital delay Check analog delay Run Calibration on main board. on main board. Performance Check. 7–19 1502B MTDR Service Manual...
  • Page 177 Control Panel Installation Watertight Seals To prevent moisture and dirt from getting into the 1502B, special seals are used around the LCD faceplate, options port, battery pack port, front panel, and front-panel button boot. Removing the front-panel button boot or other rubber seals will require special resealing procedures to retain the instrument weathertightness.
  • Page 178 OVER rear panel casting without a gap. Rear panel casting Side panel EMI Shields Figure 7–18: Installing Top and Bottom EMI Shields 3. Insert the leading edge of the shield under the lip of the front panel. 7–21 1502B MTDR Service Manual...
  • Page 179 2. Reach inside the case and use your fingers to push the four captive mounting screws out so that their heads stick up and out of the rear feet. 3. Align the case with the chassis. 7–22 1502B MTDR Service Manual...
  • Page 180 6. Check the gap between the case and the front panel casting to make sure that the case and front panel are mated evenly all around. If not mated properly, loosen the screws, reposition the case, then tighten the screws again. 7–23 1502B MTDR Service Manual...
  • Page 181 Maintenance 7–24 1502B MTDR Service Manual...
  • Page 183 When ordering parts, include the part number plus instrument type, serial number, and modification number (if applicable). If a part is replaced with a new or improved part, your Tektronix representative will contact you regarding any change in part number.
  • Page 184 U.S. Federal Cataloging Handbook, H6–1. Mfg. Code (Column 6) This column lists the code number of the manufacturer of the part. Mfg. Part Number (Column 7) This column lists the manufacturer’s part number. 8–2 1502B MTDR Service Manual...
  • Page 185 DIV OF RSM ELECTRON POWER INC 14433 ITT SEMICONDUCTORS DIV WEST PALM BEACH FL 14552 MICROSEMI CORP 2830 S FAIRVIEW ST SANTA ANA CA 92704–5948 14936 GENERAL INSTRUMENT CORP 600 W JOHN ST HICKSVILLE NY 11802 DISCRETE SEMI CONDUCTOR DIV 8–3 1502B MTDR Service Manual...
  • Page 186 RCD COMPONENTS INC 520 E INDUSTRIAL PARK DR MANCHESTER NH 03103 56845 DALE ELECTRONICS INC 2300 RIVERSIDE BLVD NORFOLK NE 68701–2242 PO BOX 74 56866 QUALITY THERMISTOR INC 2096 SOUTH COLE RD SUITE 7 BOISE ID 83705 8–4 1502B MTDR Service Manual...
  • Page 187 LA GRANGE IL 60525–5914 PO BOX 10373 81855 EAGLE–PICHER INDUSTRIES INC COUPLES DEPT C AND PORTER STS JOPLIN MO 64801 ELECTRONICS DIV PO BOX 47 91637 DALE ELECTRONICS INC 2064 12TH AVE COLUMBUS NE 68601–3632 PO BOX 609 8–5 1502B MTDR Service Manual...
  • Page 188 CKT BD ASSY:FRONT PANEL 80009 672–1251–02 620–0477–00 R010100 R020398 POWER SUPPLY ASSEMBLY 80009 620–0477–00 620–0477–01 R020399 R024999 POWER SUPPLY ASSEMBLY 80009 620–0477–01 620–0477–02 B025000 B036426 POWER SUPPLY ASSEMBLY 80009 620–0477–02 620–0477–03 B036427 POWER SUPPLY ASSEMBLY 80009 620–0477–03 8–6 1502B MTDR Service Manual...
  • Page 189 670–9291–04 B037400 CKT BD ASSY:S/R DRIVER SAMPLER 80009 670–9291–04 672–1241–00 B010100 B037542 CKT BD ASSY:DISPLAY MODULE 672–1241–00 118–9050–00 B037543 CKT BD ASSY:DISPLAY MODULE 118–9050–00 (OPTION 03 ONLY) 670–6592–00 CKT BD ASSY:POWER FUSE JACK 80009 670–6592–00 8–7 1502B MTDR Service Manual...
  • Page 190 C322C102J2G5CA A1A1C1023 283–0359–01 CAP,FXD,CER DI:1000PF,5%,200V SQ 31433 C322C102J2G5CA A1A1C1024 283–0359–01 CAP,FXD,CER DI:1000PF,5%,200V SQ 31433 C322C102J2G5CA A1A1C1030 283–0190–00 CAP,FXD,CER DI:0.47UF,5%,50V SQ 04222 SR305C474JAA A1A1C1031 281–0925–01 CAP,FXD,CER DI:MLC,0.22UF,20%,50V,Z5U 31433 C114C224M5Y5CA A1A1C1032 283–0359–01 CAP,FXD,CER DI:1000PF,5%,200V SQ 31433 C322C102J2G5CA 8–8 1502B MTDR Service Manual...
  • Page 191 SR155C103KAA A1A1C2044 281–0925–01 CAP,FXD,CER DI:MLC,0.22UF,20%,50V,Z5U 31433 C114C224M5Y5CA A1A1C2045 283–0421–00 CAP,FXD,CER DI:0.1UF,+80–20%,50V 24165 923CX7R104M050B A1A1C2046 283–0067–00 B021135 CAP,FXD,CER DI:0.001UF,10%,200V 18796 DD09B10 Y5F 102K 200V A1A1C3020 281–0925–01 CAP,FXD,CER DI:MLC,0.22UF,20%,50V,Z5U 31433 C114C224M5Y5CA A1A1C3021 281–0925–01 CAP,FXD,CER DI:MLC,0.22UF,20%,50V,Z5U 31433 C114C224M5Y5CA 8–9 1502B MTDR Service Manual...
  • Page 192 04222 SA105E473MAA A1A1C5032 281–0798–00 CAP,FXD,CER DI:51PF,1%,100V TUBULAR,MI 04222 SA101A510GAA A1A1C5033 283–0330–00 CAP,FXD,CER DI:100PF,5%,50V SQ 16546 CN15C101J A1A1C5040 283–0330–00 CAP,FXD,CER DI:100PF,5%,50V SQ 16546 CN15C101J A1A1C5041 281–0925–01 CAP,FXD,CER DI:MLC,0.22UF,20%,50V,Z5U 31433 C114C224M5Y5CA A1A1C5042 281–0925–01 CAP,FXD,CER DI:MLC,0.22UF,20%,50V,Z5U 31433 C114C224M5Y5CA 8–10 1502B MTDR Service Manual...
  • Page 193 CAP,FXD,CER DI:MLC,0.04UF,20%,50V 04222 SA105E473MAA A1A1C9025 281–0925–01 CAP,FXD,CER DI:MLC,0.22UF,20%,50V,Z5U 31433 C114C224M5Y5CA A1A1C9030 281–0925–01 CAP,FXD,CER DI:MLC,0.22UF,20%,50V,Z5U 31433 C114C224M5Y5CA A1A1C9031 290–0748–00 CAP,FXD,ELCTLT:10UF,+50–20%,25W VDC 0J9R5 CEUST1E100 A1A1C9032 283–0359–01 CAP,FXD,CER DI:1000PF,5%,200V SQ 31433 C322C102J2G5CA A1A1C9033 283–0359–01 CAP,FXD,CER DI:1000PF,5%,200V SQ 31433 C322C102J2G5CA 8–11 1502B MTDR Service Manual...
  • Page 194 XSTR,PWR:MOS,P–CH;100V,1.0A,0.6 OHM 04713 IRFD9120 A1A1Q1020 151–0190–00 XSTR,SIG:BIPOLAR,NPN;40V,200MA,300MHZ,AMP 01295 SKA3703 A1A1Q1021 151–0188–00 XSTR,SIG:BIPOLAR,PNP;40V,200MA,250MHZ,AMP 03508 X39H3162 A1A1Q1030 151–0190–00 XSTR,SIG:BIPOLAR,NPN;40V,200MA,300MHZ,AMP 01295 SKA3703 A1A1Q1031 151–0188–00 XSTR,SIG:BIPOLAR,PNP;40V,200MA,250MHZ,AMP 03508 X39H3162 A1A1Q2011 151–1176–00 XSTR,PWR:MOS,P–CH;100V,1.0A,0.6 OHM 04713 IRFD9120 A1A1Q2012 151–1176–00 XSTR,PWR:MOS,P–CH;100V,1.0A,0.6 OHM 04713 IRFD9120 8–12 1502B MTDR Service Manual...
  • Page 195 322–3289–00 RES,FXD:METAL FILM:10.0K OHM,1%,0.2W 57668 CRB20 FXE 10K0 A1A1R1021 322–3289–00 RES,FXD:METAL FILM:10.0K OHM,1%,0.2W 57668 CRB20 FXE 10K0 A1A1R1022 322–3289–00 RES,FXD:METAL FILM:10.0K OHM,1%,0.2W 57668 CRB20 FXE 10K0 A1A1R1023 322–3289–00 RES,FXD:METAL FILM:10.0K OHM,1%,0.2W 57668 CRB20 FXE 10K0 8–13 1502B MTDR Service Manual...
  • Page 196 A1A1R3037 322–3314–00 RES,FXD:METAL FILM:18.2K OHM,1%,0.2W 57668 CRB20 FXE 18K2 A1A1R3038 322–3306–00 RES,FXD:METAL FILM:15.0K OHM,1%,0.2W 57668 CRB20 FXE 15K0 A1A1R3039 322–3327–00 RES,FXD,FILM:24.9K OHM,1%,0.2W 57668 CRB20 FXE 24K9 A1A1R3040 322–3385–00 RES,FXD:METAL FILM:100K OHM,1%,0.2W 57668 CRB20 FXE 100K 8–14 1502B MTDR Service Manual...
  • Page 197 CRB20 FXE 100E A1A1R5033 322–3068–00 RES,FXD:METAL FILM:49.9 OHM,0.1%,0.2W 57668 CRB20 FXE 49E9 A1A1R5034 322–3184–00 RES,FXD,FILM:806 OHM,1%,0.2W 57668 CRB20 FXE 806E A1A1R5035 322–3250–00 RES,FXD:METAL FILM:3.92K OHM,1%,0.2W 91637 CCF50–2F39200F A1A1R6030 322–3068–00 RES,FXD:METAL FILM:49.9 OHM,0.1%,0.2W 57668 CRB20 FXE 49E9 8–15 1502B MTDR Service Manual...
  • Page 198 RES,FXD:METAL FILM:2.00K OHM,1%,0.2W 57668 CRB20 FXE 2K00 A1A1R7031 322–3306–00 RES,FXD:METAL FILM:15.0K OHM,1%,0.2W 57668 CRB20 FXE 15K0 A1A1R7032 321–0720–00 RES,FXD,FILM:60K OHM,1%,0.125W 91637 CMF55–116–G–60001FT A1A1R7033 322–3269–00 RES,FXD,FILM:6.19K OHM,1%,0.2W 91637 CCF501G61900F A1A1R7034 322–3068–00 RES,FXD:METAL FILM:49.9 OHM,0.1%,0.2W 57668 CRB20 FXE 49E9 8–16 1502B MTDR Service Manual...
  • Page 199 57668 CRB20 FXE 20K0 A1A1R8047 322–3289–00 RES,FXD:METAL FILM:10.0K OHM,1%,0.2W 57668 CRB20 FXE 10K0 A1A1R9010 322–3114–00 RES,FXD:METAL FILM:150 OHM,1%,0.2W 57668 CRB20–FX150E A1A1R9011 322–3258–00 RES,FXD:METAL FILM:4.75K OHM,1%,0.2W 56845 CCF50–2–G4751FT A1A1R9012 322–3143–00 RES,FXD,FILM:301 OHM,1%,0.2W 57668 CRB20 FXE 301E 8–17 1502B MTDR Service Manual...
  • Page 200 TERM,TEST POINT:0.052 ID,0.169 H,0.465 L 10392 7–16150–8 A1A1TP9041 214–0579–02 B010100 B037260 TERM,TEST POINT:0.052 ID,0.169 H,0.465 L 10392 7–16150–8 A1A1U1010 156–2760–00 IC,DIGITAL:CMOS,MISC;NONVOLATILE CONTROL 0B0A9 DS1210 A1A1U1011 156–2763–00 IC,DIGITAL:HCMOS,FLIP FLOP;DUAL J–K 04713 MC74HC113N A1A1U1012 156–1225–00 IC,LINEAR:BIPOLAR,COMPARATOR;DUAL 01295 LM393P 8–18 1502B MTDR Service Manual...
  • Page 201 156–2096–00 IC,DIGITAL:ALSTTL,FLIP FLOP;QUAD D–TYPE 01295 SN74ALS175N A1A1U2037 156–2098–00 IC,DIGITAL:ALSTTL,COUNTER;SYNCH 4–BIT 01295 SN74ALS161BN A1A1U2040 156–2437–00 IC,DIGITAL:HCTCMOS,GATE;QUAD 2–INPUT AND 34371 CD74HCT08E17 A1A1U2041 156–2768–00 IC,LINEAR:12 BIT PLUS SIGN 1205 27014 ADC1205 A1A1U2042 156–2759–00 IC,DIGITAL:ALSTTL,FLIP FLOP;DUAL J–K 01295 74ALS113 8–19 1502B MTDR Service Manual...
  • Page 202 MC74F00 (N OR J) A1A1U8040 156–0513–00 IC,MISC:CMOS,ANALOG MUX;8 CHANNEL 04713 MC14051BCP A1A1U8041 156–1114–00 IC,LINEAR:MOS/FET INP,COS/MOS OUT,OP AMP 34371 CA3160E A1A1U9030 156–0496–00 IC,LINEAR:VOLTAGE REGULATOR RC4194D,MI 34333 SG4194CJ A1A1VR3030 152–0647–00 DIODE,ZENER:6.8V,5%,0.4W;1N957B 04713 1N957B A1A1VR6030 152–0514–00 DIODE,ZENER:10V,1%,0.4W;MZ4104D 04713 MZ4104D 8–20 1502B MTDR Service Manual...
  • Page 203 KME35VB471M10X20LL A2C3032 281–0925–01 CAP,FXD,CER DI:MLC,0.22UF,20%,50V,ZRU 31433 C114C224M5Y5CA A2C3033 281–0925–01 CAP,FXD,CER DI:MLC,0.22UF,20%,50V,ZRU 31433 C114C224M5Y5CA A2C3034 281–0925–01 CAP,FXD,CER DI:MLC,0.22UF,20%,50V,ZRU 31433 C114C224M5Y5CA A2J1020 131–3147–00 CONN,HDR:PCB,MALE,STR,2 X 25,0.1 CTR 22526 66506–032 A2J3030 131–1857–00 CONN,HDR:PCB,MALE,STR,1 X 36,0.1 CTR 58050 082–3644–SS10 8–21 1502B MTDR Service Manual...
  • Page 204 322–3385–00 RES,FXD:METAL FILM:100K OHM,1%,0.2W 57668 CRB20 FXE 100K A2R2035 322–3385–00 RES,FXD:METAL FILM:100K OHM,1%,0.2W 57668 CRB20 FXE 100K A2R2036 322–3385–00 RES,FXD:METAL FILM:100K OHM,1%,0.2W 57668 CRB20 FXE 100K A2R2037 322–3385–00 RES,FXD:METAL FILM:100K OHM,1%,0.2W 57668 CRB20 FXE 100K 8–22 1502B MTDR Service Manual...
  • Page 205 156–2589–00 IC,CONVERTER:TTL,A/D;8–BIT,100US,SAR 80009 156–2589–00 A2U2024 156–2758–00 IC,DIGITAL:HCMOS,MUX/ENCODER;DUAL 0JR04 TC74HC253AP A2U2025 156–2758–00 IC,DIGITAL:HCMOS,MUX/ENCODER;DUAL 0JR04 TC74HC253AP A2U3020 156–2026–00 IC,DIGITAL:HCMOS,GATE;QUAD 2–INPUT NOR 04713 MC74HC02AN A2U3021 156–2026–00 IC,DIGITAL:HCMOS,GATE;QUAD 2–INPUT NOR 04713 MC74HC02AN A2U3022 156–2026–00 IC,DIGITAL:HCMOS,GATE;QUAD 2–INPUT NOR 04713 MC74HC02AN 8–23 1502B MTDR Service Manual...
  • Page 206 Number Part Number Effective Discont’d Name & Description Code Mfr. Part Number 672–1251–XX CIRCUIT BD ASSY:FRONT PANEL (Con’t) A2U3023 156–2026–00 IC,DIGITAL:HCMOS,GATE;QUAD 2–INPUT NOR 04713 MC74HC02AN A2U3025 156–2758–00 IC,DIGITAL:HCMOS,MUX/ENCODER;DUAL 0JR04 TC74HC253AP A2U3031 156–2758–00 IC,DIGITAL:HCMOS,MUX/ENCODER;DUAL 0JR04 TC74HC253AP 8–24 1502B MTDR Service Manual...
  • Page 207 283–0177–00 CAP,FXD,CER DI:1UF,+80–20%,25V 04222 SR305E105ZAA A3A1C1035 283–0177–00 CAP,FXD,CER DI:1UF,+80–20%,25V 04222 SR305E105ZAA A3A1C1036 283–0177–00 CAP,FXD,CER DI:1UF,+80–20%,25V 04222 SR305E105ZAA A3A1C1037 290–0973–01 CAP,FXD,ELCTLT:100UF,20%,25VDC AL 1W344 SME35VB101M8X11FT A3A1C1038 283–0177–00 CAP,FXD,CER DI:1UF,+80–20%,25V 04222 SR305E105ZAA A3A1C2010 290–0973–01 CAP,FXD,ELCTLT:100UF,20%,25VDC AL 1W344 SME35VB101M8X11FT 8–25 1502B MTDR Service Manual...
  • Page 208 DIODE DVC,DI:RECT,SI,1A,40V 1N5819 80009 152–0836–00 A3A1CR2016 152–0141–02 DIODE,SIG:ULTRA FAST;40V,150MA,4NS,2PF 14433 1N4152 A3A1CR2020 152–0322–00 DIODE DVC,DI:SCHOTTKY,SI,15V,1.2PF 50434 5082–2672 A3A1CR2021 152–0601–00 DIODE,RECT:ULTRA FAST;150V,25NS,35A 04713 MUR115 A3A1CR2030 152–0333–00 DIODE DVC,DI:SW,SI,55V,200MA 12969 NDP261 A3A1CR2031 152–0333–00 DIODE DVC,DI:SW,SI,55V,200MA 12969 NDP261 8–26 1502B MTDR Service Manual...
  • Page 209 CRB20 FXE 14K0 A3A1R1017 322–3243–00 RES,FXD:METAL FILM:3.32K OHM,1%,0.2W 91637 CCF50–1–G3200F A3A1R1018 322–3318–00 RES,FXD:METAL FILM:20K OHM,1%,0.2W 57668 CRB20 FXE 20K0 A3A1R1020 321–0133–00 R010100 R020398 RES,FXD,FILM:237 OHM,1%,0.125W 80009 321–0133–00 322–3189–00 R020399 RES,FXD,FILM:909 OHM,1%,0.2W 57668 CRB20 FXE 909E 8–27 1502B MTDR Service Manual...
  • Page 210 RES,FXD:METAL FILM:10K OHM,1%,0.2W 57668 CRB20 FXE 10K0 A3A1R2027 308–0839–00 RES,FXD:0.1 OHM,5%,1.0W MI 56637 BW1 0.1 OHM A3A1R2030 322–3326–00 RES,FXD,FILM:24.3K OHM,1%,0.2W 91637 CCF50–2F24301F A3A1R2031 317–0027–00 RES,FXD,CMPSN:2.7 OHM,5%,0.125W 01121 BB27G5 A3A1R2032 308–0767–00 RES,FXD:1.1 OHM,5%,1W MI 75042 SP–20–1.1 OHM –5% 8–28 1502B MTDR Service Manual...
  • Page 211 IC,LINEAR:BIPOLAR,VOLT REF;POS,2.5V,1.0% 04713 MC1403U A3A1U1023 156–0933–00 IC,LINEAR:REGULATOR,PULSE WIDTH 34333 SG3524N A3A1U1024 156–0366–00 IC,DIGITAL:CMOS,FLIP FLOP;DUAL D–TYPE 04713 MC14013BCP A3A1U2010 156–1161–00 IC,LINEAR:BIPOLAR,VOLT REG;POS,ADJ 04713 LM317T A3A1U2030 156–0494–00 IC,DIGITAL:CMOS,BUFFER/DRIVER;HEX INV 04713 MC14049UBCP A3A1VR1012 152–0217–00 R010141 DIODE,ZENER:8.2V,5%,0.4W 14552 TD3810979 8–29 1502B MTDR Service Manual...
  • Page 212 A4C2031 283–0193–00 CAP,FXD,CER DI:510PF,2%,100V 04222 SR201A511GAA A4C2040 281–0775–00 CAP,FXD,CER DI:0.1UF,20%,50V 04222 SA105E104MAA A4C2041 281–0775–00 CAP,FXD,CER DI:0.1UF,20%,50V 04222 SA105E104MAA A4C2042 281–0861–00 CAP,FXD,CER DI:270PF,5%,50V 04222 SA101A271JAA A4C2050 281–0775–00 CAP,FXD,CER DI:0.1UF,20%,50V 04222 SA105E104MAA A4C2051 290–0522–01 CAP,FXD,ELCTLT:1UF,20%,50V 31433 T355B105M050AS 8–30 1502B MTDR Service Manual...
  • Page 213 152–0322–00 DIODE DVC,DI:SCHOTTKY,SI,15V,1.2PF 21847 A2X600 A4CR2050 152–0333–00 DIODE DVC,DI:SW,SI,55V,200MA,DO–351N461D 03508 DJ2011 A4CR2051 152–0333–00 DIODE DVC,DI:SW,SI,55V,200MA,DO–351N461D 03508 DJ2011 A4CR2052 152–0333–00 DIODE DVC,DI:SW,SI,55V,200MA,DO–351N461D 03508 DJ2011 A4CR3020 152–0322–00 DIODE DVC,DI:SCHOTTKY,SI,15V,1.2PF 21847 A2X600 A4CR3021 152–0322–00 DIODE DVC,DI:SCHOTTKY,SI,15V,1.2PF 21847 A2X600 8–31 1502B MTDR Service Manual...
  • Page 214 RES,FXD,FILM:60.4K OHM,1%,0.2W 57668 CRB20 FXE 60K4 A4R1066 322–3297–00 RES,FXD,FILM:12.1K OHM,1%,0.2W 57668 CRB20 FXE 12K1 A4R1070 322–3289–00 RES,FXD:METAL FILM:10K OHM,1%,0.2W 57668 CRB20 FXE 10K0 A4R1071 315–0100–00 RES,FXD,FILM:10 OHM,5%,0.25W 01121 CB1005 A4R1072 315–0100–00 RES,FXD,FILM:10 OHM,5%,0.25W 01121 CB1005 8–32 1502B MTDR Service Manual...
  • Page 215 RES,FXD,FILM:130K OHM,1%,0.2W 57668 CRB20 FXE 130K A4R3062 321–0631–03 RES,FXD,FILM:12.5K OHM,0.25%,0.125W 01121 ADVISE A4R3070 322–3389–00 RES,FXD,FILM:110K OHM,0.25%,0.2W 56845 CCF–50–2–1103F A4R3071 321–0645–00 RES,FXD,FILM:100K OHM,0.5%,0.125W 19701 5033RC1003D A4R3080 321–0645–00 RES,FXD,FILM:100K OHM,0.5%,0.125W 19701 5033RC1003D A4T1020 120–0582–00 XFMR,TOROID:2 WINDINGS,067–0572–00 0JR03 120–0582–00 8–33 1502B MTDR Service Manual...
  • Page 216 80009 119–2369–01 A4U1050 156–0853–00 IC,LINEAR:BIPOLAR,OP–AMP;DUAL 04713 LM358N A4U1070 156–0853–00 IC,LINEAR:BIPOLAR,OP–AMP;DUAL 04713 LM358N A4U2050 156–1291–00 IC,LINEAR:BIFET,OP–AMP;DUAL,LOW PWR 01295 TL062CP A4U2070 156–1490–00 IC,LINEAR:VOLTAGE REFERENCE 2–PIN 1ES66 ICL8069CCSQ2 A4U3030 156–2761–00 IC,DIGITAL:HCMOS,MULTIVIBRATOR 04713 MC74HC221N A4U3070 156–0853–00 IC,LINEAR:BIPOLAR,OP–AMP;DUAL 04713 LM358N 8–34 1502B MTDR Service Manual...
  • Page 217 Assy Tektronix Serial No. Serial No. Mfr. Number Part Number Effective Discont’d Name & Description Code Mfr. Part Number 670–6592–XX CIRCUIT BD ASSY:POWER FUSE JACK OPTION 03 ONLY A9F9100 159–0266–00 FUSE, CANISTER:3A,125V,RADIAL LEAD 75915 273.003 8–35 1502B MTDR Service Manual...
  • Page 218 (FROM A4J3040 TO A1A1J9010) J101 174–0957–00 B010100 B037303 CA ASSY,PWR:2 STRAND W/CONN 80009 174–0957–00 (FROM A3T210 TO POWER SUPPLY) 198–5460–00 R010100 R020421 WIRE SET,ELEC:POWER SUPPLY MODULE 80009 198–5460–00 198–5460–01 R020422 WIRE SET,ELEC:POWER SUPPLY MODULE 80009 198–5460–01 8–36 1502B MTDR Service Manual...
  • Page 220 Logic symbology reflects the actual part function, not the logic function performed. Therefore, logic symbols should reflect manufacturer’s data. Component Values Electrical components shown on the diagrams are in the following units: Resitstors = Ohm (Ω) 9–1 1502B MTDR Service Manual...
  • Page 221 A component number is obtained by adding the assembly number prefix to the circuit number. The component number may then be used to reference a part in the replaceable electrical parts list. 9–2 1502B MTDR Service Manual...
  • Page 222 Diagrams Refer to Internal diagram 3A Test point adjustment Connector to 3D Instrument type Board name Functional name Assembly Assembly Diagram part number reference number number Figure 9–1: Special Schematic Symbols 9–3 1502B MTDR Service Manual...
  • Page 223 C5040 CR4030 C2037 C5041 C2038 C5042 CR4031 C2039 C6030 CR4032 C2040 C6031 CR5030 C2041 CR5040 C2042 C6032 CR8020 C7010 CR9010 C2043 C7020 C2044 C7021 J2010 C2045 C7022 J5040 † C2046 C7023 J6010 Back Side Components 9–4 1502B MTDR Service Manual...
  • Page 224 R3042 R7010 R1011 R4020 R7011 R1012 R4021 R7012 R1013 R4022 R7013 R1014 R4023 R7014 R1015 R4030 R7015 R1016 R4031 R7020 R1020 R4032 R7021 R1021 R4040 R7022 R1022 R4041 R7023 R1023 R4042 R7024 Back Side Components 9–5 1502B MTDR Service Manual...
  • Page 225 R8046 U1023 U2034A R8047 U1030 U2034B R9010 U1031A U2034C R9011 U1031B U2034D R9012 U2036 U1031C R9013 U1031D U2037 R9014 U1031E U2040A R9015 U1031F U2040B R9020 U1032A U2040C R9021 U1032B U2040D R9022 U2041 Back Side Components 9–6 1502B MTDR Service Manual...
  • Page 226 U2045C U2046 U3010 U3020A U3020B U3020C U3020D U3021 U3022 U3023 U3040 U3041 U3042 U4020 U4021A U4021B U4040 U5010 U5020 U5040 U6040 U7010A U7010B U7040 U8010A U8010B U8010C U8040 U8041 U9030 VR3030 VR6030 Back Side Components 9–7 1502B MTDR Service Manual...
  • Page 227 U3025 C3034 R3020B U3031 R3024 J1020 † R3031 J3030 † S1010 PS2030 † S1011 S2010 Q1020 S2011 Q1030 S3010 Q2020 S3012 R1010 S3020 R1011 S3021 R1012 S3022 R1013 R1014 U2010A R1020 U2010B Back Side Components 9–8 1502B MTDR Service Manual...
  • Page 228 C2024 Q2021 R2025 C2025 Q2022 R2026 C2030 Q2030 R2027 C2031 Q2031 R2030 R2031 CR1010 R1010 R2032 CR1011 R1011 CR1030 R1012 S2010 CR1031 R1013 CR1032 R1014 T1030 CR1033 R1015 T1031 CR1034 R1016 TP1010 Back Side Components 9–9 1502B MTDR Service Manual...
  • Page 229 Diagrams A3A1 – POWER SUPPLY CIRCUIT SCHEM LOCATION NUMBER PAGE SCHEM TP1020 TP2010 TP2030 U1010 U1011 U1020A U1020B U1021A U1021B U1022 U1023 U1024B U2010 U2030A U2030B U2030C U2030D U2030E VR1012 Back Side Components 9–10 1502B MTDR Service Manual...
  • Page 230 C2053 R1030 R3050 R1031 C2072 R1040 R3051 C2080 R1041 R3061 C2081 R3062 C2082 R1042 R3070 C2083 R1050 R3071 C3010 R1051 R3080 R1052 C3011 R1053 T1020 C3020 R1060 C3030 TP1020 C3060 R1061 TP1021 Back Side Components 9–11 1502B MTDR Service Manual...
  • Page 231 A4 – S/R DRIVER SAMPLER CIRCUIT SCHEM LOCATION NUMBER PAGE SCHEM TP1030 TP1060 TP1080 TP1081 TP1082 TP1083 TP1084 TP2060 TP3020 U1010 U1050A U1050B U1070A U1070B U2050A U2050B U2070 U3030A U3030B U3070A U3070B Back Side Components 9–12 1502B MTDR Service Manual...
  • Page 232 Diagrams A9 – POWER FUSE JACK (Option 03 - Battery Pack) CIRCUIT SCHEM BOARD NUMBER LOCATION LOCATION F9100 D3 PWR SUPP 9–13 1502B MTDR Service Manual...
  • Page 233 Diagrams 9–14 1502B MTDR Service Manual...
  • Page 235 Replaceable Mechanical Parts This section contains a list of the replaceable mechanical components for the 1502B. 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 236 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 237 5H194 AIR–OIL PRODUCTS CORP 2400 E BURNSIDE PORTLAND, OR 97214–1752 5Y400 TRIAX METAL PRODUCTS INC 1800 216TH AVE NW HILLSBORO, OR 97124–6629 53217 TECHNICAL WIRE PRODUCTS INC 320 N NOPAL ST SANTA BARBARA, CA 93103–3225 10–3 1502B MTDR Service Manual...
  • Page 238 PARKER–HANNIFIN CORP, O–SEAL DIV 10567 JEFFERSON BLVD CULVER CITY, CA 90232–3513 83385 MICRODOT MFG INC, GREER–CENTRAL DIV 3221 W BIG BEAVER RD TROY, MI 48098 86445 PENN FIBRE AND SPECIALTY CO INC 4343 G ST PHILADELPHIA, PA 19124–4325 10–4 1502B MTDR Service Manual...
  • Page 239 . . SCR,TPG,TF:6–20 X 0.5,TYPEB,PNH,POZ 93907 ORD BY DESCR –25 131–1705–00 R010100 B025092 . . CONN,RCPT,ELEC:POWER INTERCONNECT 80009 131–1705–00 131–1705–01 B025093 . . CONN,RCPT,ELEC:POWER INTERCONNECT 80009 131–1705–01 –26 213–0012–00 . . SCR,TPG,TC:4–40 X 0.375,FLH,POZ 83385 ORD BY DESCR 10–5 1502B MTDR Service Manual...
  • Page 240 (OPTION A4 NORTH AMERICA ONLY) –41 161–0154–00 CA ASSY,PWR:3,0.75mm SQ,240V,6A,2.5ML S3109 12–H05VVF3G 00–5 (OPTION A5 SWITZERLAND ONLY) –42 161–0228–00 CA ASSY,PWR:3,18 AWG,98.0 L (STANDARD CABLE) 70903 FH49061 ALL OF THE CABLES LISTED ARE SAFETY CONTROLLED 10–6 1502B MTDR Service Manual...
  • Page 241 Serial No. Serial No. Mfr. Index Number Effective Discont’d Code Number Name & Description Mfr. Part Number FIG. 10-1 CABINET (Con’t) 016–0814–00 POUCH,ACCESS:11.5 X 9.5 X 1.75 H,VINYL 0JRZ2 016–0814–00 070–6266–XX MANUAL,TECH:OPERATORS,1502B TDR 80009 070–6266–XX 10–7 1502B MTDR Service Manual...
  • Page 242 366–0655–01 –13 366–0655–02 PUSH BUTTON:VIEW STORE 0JR05 366–0655–02 –14 366–0655–03 PUSH BUTTON:VIEW DIFF 0JR05 366–0655–03 –15 366–0655–04 PUSH BUTTON:STORE 0JR05 366–0655–04 –16 334–6664–00 R010100 B025495 MARKER,IDENT:MARKED 1502B 0J4Z2 334–6664–00 334–6664–01 B025496 MARKER,IDENT:MARKED 1502B 0J4Z2 334–6664–01 10–8 1502B MTDR Service Manual...
  • Page 243 12327 ORD BY DESCR 334–8135–00 B035976 B037458 MKR,IDENT:MKD EMI SHIELD INSTRU 0J4Z2 334–8135–00 (NOT ILLUSTRATED AT THIS TIME) –33 650–3714–00 ON/OFF SHAFT ASSEMBLY TK2545 650–3714–00 –34 ––––– ––––– SHAFT ASSEMBLY INCLUDES. O–RING:0.031 X 0.93 OD 10–9 1502B MTDR Service Manual...
  • Page 244 . LCH,OPT PORT COVER:STEEL,ZINC PLATE 72794 DZUSDP109SMOD 105–0959–01 B025510 . LCH,OPT PORT COVER:STEEL,ZINC PLATE 72794 DZUSDP109SMOD –49 407–3675–00 B021134 . FRAME:OPTION PORT COVER 0J260 407–3675–00 –50 213–0123–00 B021134 . SCR,TPG,TF:6–32 X 0.375,FLH100 DEG,POZ 72228 ORD BY DESCR 10–10 1502B MTDR Service Manual...
  • Page 245 SCR,ASSEM WSHR:4–40 X 0.25,PNH,POZ 01536 821–01655–024 –74 131–3361–00 . CONN,HDR:PCD,MALE,RTANG W/SHRD 53387 2526–5002UB –75 131–3181–00 . CONN,HDR:PCB,MALE,RTANG W.SHRD 53387 2540–5002UB –76 131–3359–00 . CONN,HDR:PCB,MALE,2 X 10 53387 2520–5002UB –77 136–0755–00 . SKT,DIP:FEMALE,2 X 14 09922 DILB28P–108 10–11 1502B MTDR Service Manual...
  • Page 246 131–4183–00 . CONN,HDR:PCB,MALE,2 X 7 53387 2514–6002UB –79 213–0904–00 SCR,TPG,TR:6–32 X 0.5 PNH,TORX 93907 ORD BY DESCR –80 441–1682–00 R010100 R020513 CHASSIS,MAIN:AL 80009 441–1682–00 441–1682–01 R020514 B035824 CHASSIS,MAIN:AL 80009 441–1682–01 441–1682–03 B035825 CHASSIS,MAIN:AL 80009 441–1682–03 10–12 1502B MTDR Service Manual...
  • Page 247 S3629 031 1673 –19 200–2264–00 CAP,FUSEHLDR:3AG FUSES,SFTY CONTROL S3629 FEK 031 1666 –20 ––––– ––––– FILTER,RF: (SEE A3FL1 REPL) –21 211–0101–00 SCR,MACH:4–40 X 0.25,FLH,100 DEG,POZ 93907 ORD BY DESCR –22 210–0202–00 TERMINAL,LUG:0.146 ID,LOCKING 86928 A–373–158–2 10–13 1502B MTDR Service Manual...
  • Page 248 ORD BY DESCR –29 210–0933–00 INSULATOR,WSHR:0.165 C 0.625 OD X 0.002 OKB01 210–0933–00 –30 441–1684–00 R010100 B021134 CHASSIS,PWR SUPPLY: 80009 441–1684–00 441–1684–01 B021135 CHASSIS,PWR SUPPLY: 80009 441–1684–01 334–3379–01 MARKER,IDENT:MKD GROUND SYMBOL 22670 ORD BY DESCR 10–14 1502B MTDR Service Manual...
  • Page 249 . . SOCKET,PIN TERM:U/W 0.02 DIA PINS 00779 50462–7 –18 386–2435–00 . PLATE,METALLIC:W/TAPS 0J244 386–2435–00 –19 146–0065–00 . BATTERY,DRY:(9) 1.4V,200MA,NICAD 146–0065–00 0DWW6 –20 214–2343–00 . HEAT SINK,ELEC:BATTERY SPLY,UPPER,AL 0J9P4 214–2343–00 –21 ––––– ––––– . FUSE,THERMAL: (SEE A9F9100 REPL) 10–15 1502B MTDR Service Manual...
  • Page 250 Replaceable Mechanical Parts Replaceable Mechanical Parts List (Cont.) Fig. & Tektronix Part Serial No. Serial No. Mfr. Index Number Effective Discont’d Code Number Name & Description Mfr. Part Number 10–16 1502B MTDR Service Manual...
  • Page 251 Cables are designed to match the source and load for the electrical energy that they carry. The designed impedance is often called the characteristic impedance of the cable. The arrangement of the conductors with respect to each other is the major factor in designing the impedance of cables. Glossary–1 1502B MTDR Service Manual...
  • Page 252 The pulse of electrical energy sent out by the TDR. The waveform shown by the TDR consists of this pulse and the reflections of it coming back from the cable or circuit being tested. Inductance (see Reactance) Glossary–2 1502B MTDR Service Manual...
  • Page 253 More waveforms in an average are more likely to approach the real signal (although it takes longer to acquire and add together more waveforms). Glossary–3 1502B MTDR Service Manual...
  • Page 254 AC waveform. Sampling Efficiency Our instruments make measurements by taking a succession of samples in time and displaying them as a waveform with voltage on the vertical scale (up and down) and Glossary–4 1502B MTDR Service Manual...
  • Page 255 (so it is always a number between 0 and 1). A velocity of propagation value of 0.50 indicates that the electrical energy moves through the cable at half the speed of light. Waveform Averaging (see Noise) Glossary–5 1502B MTDR Service Manual...
  • Page 256 Glossary Glossary–6 1502B MTDR Service Manual...
  • Page 257 Index Index–1 1502B MTDR Service Manual...
  • Page 258 Front Panel Board, 9–25 Main Board, 9–15 Power Supply Board, 9–28 Exploded Views Assemblies, 10–18 Battery Pack, 10–20 Cabinet, 10–17 Frame, 10–18 Front Panel Controls, 10–18 Power Supply, 10–19 Schematics Driver/Sampler Board, 9–31 Front Panel Board Index–2 1502B MTDR Service Manual...
  • Page 259 Index Main Board Power Fuse Jack, 9–32 Power Supply Board, 9–29 Index–3 1502B MTDR Service Manual...
  • Page 260 Index Index–4 1502B MTDR Service Manual...
  • Page 261 Index Index–5 1502B MTDR Service Manual...
  • Page 262 Index Index–6 1502B MTDR Service Manual...

Table of Contents