Tektronix 221 Instruction Manual
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Tektronix 221 Instruction Manual

Tektronix 221 Instruction Manual

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Tektronix, Inc.
P.O. Box 500
Beaverton, Oregon 97005
TEKTRO N IX
221
OSCILLOSCOPE
SERVICE
INSTRUCTION
MANUAL

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  • Page 1 TEKTRO N IX OSCILLOSCOPE SERVICE INSTRUCTION MANUAL Tektronix, Inc. P.O. Box 500 Beaverton, Oregon 97005...
  • Page 2 TEKTRONIX Field Engineer or representative. All requests for repairs and replacement parts should be directed to the TEKTRONIX Field Office or representative in your area. This will assure you the fastest possible service. Please include the instrument Type Number or Part Number and Serial Number with all requests for parts or service.

  • Page 3: Table Of Contents

    221 Service TABLE OF CONTENTS Page OPERATING INFORMATION SECTION 5 CALIBRATION (cont) Page SECTION 1 AND SPECIFICATIONS PRELIMINARY PROCEDURE PRELIMINARY CONTROL INTRODUCTION SETTINGS ELECTRICAL INDEX TO CALIBRATION Vertical Deflection System PROCEDURE Triggering POWER SUPPLY Horizontal Deflection System DISPLAY Display VERTICAL SYSTEM...
  • Page 4 Fig. 1-1. The Tektronix 221 Oscilloscope. 221 Service http://manoman.sqhill.com...

  • Page 5: Operating Information Section

    0.2 inch). Maximum Safe Input Voltage: 600 volts ( DC + peak ac), 600 volts peak-to-peak ac. The 221 is operated either from ac line voltage or from internal rechargeable batteries. The internal batteries are Triggering recharged from the ac power line by the integral battery charger (with the instrument on or off).

  • Page 6: Horizontal Deflection System

    Operating Information and Specifications — 221 Service Power Horizontal Deflection System Sweep Generator: Line Voltage Operation: Calibrated Range; 200 milliseconds to one microsecond/ Line Voltage Range: 90 V to 250 V ac; 80 V to 250 V dc . division in 17 steps.

  • Page 7: Physical

    Operating Information and Specifications — 221 Service PHYSICAL Humidity (operating and non-operating): 5 days 50°C to 95% relative humidity. Temperature: Operating from Batteries, — 15°C to +55°C (+5° F to +131°F). Shock (operating and non-operating): Tested with two shocks at 100 g, one-half sine, two millisecond duration Charging or operating from ac line, 0°C to +40°C...

  • Page 8: Functions Of Controls And Connectors

    Section 2 — 221 Service FUNCTIONS OF CONTROLS AND CONNECTORS AC — blocks dc components of input signal. All controls and connectors necessary for operation of the 221 are located on the right side panel of the frequency limit ( — 3 dB point) is about two hertz.
  • Page 9 Functions of Controls And Connectors — 221 Service VOLTS/DIV Fig. 2-2. Side panel showing controls and connectors. SWP CAL — screwdriver adjustment to set the basic EXT-INT — selects the source of the trigger signal. timing of the horizontal system.

  • Page 10: Preventive Maintenance

    Preventive maintenance, when performed on a regular basis, can prevent instrument breakdown and may improve the reliability of the 221. The severity of environment to which this instrument is subjected will determine the Avoid the use of chemical cleaning agents which frequency of maintenance.

  • Page 11: Visual Inspection

    SOURCE GATE COLLECTOR SCREW MOUNTING DUAL FET TRANSISTOR COLLECTOR EMITTER COLLECTOR COLLECTOR EMITTER COLLECTOR EMITTER BASE BASE BASE BASE TRANSISTORS DUAL EMITTER METAL CASE TRANSISTORS Fig. 3-2. Lead configurations of the semiconductors used in the 221 Oscilloscope. REV. APR 1974...

  • Page 12: Recalibration

    Preventive Maintenance — 221 Service ment of components may necessitate recalibration of the Recalibration affected circuits. The Calibration procedure can also be helpful in localizing certain troubles in the instrument. In To ensure accurate measurements, check the calibration some cases, minor troubles may be revealed or corrected by of this instrument after each 1000 hours of operation, or recalibration.

  • Page 13: Circuit Description

    The following is a description of the electrical operation amplifier. The Output Amplifier stage also provides the and relationship of the circuits in the 221 with a descrip ­ circuitry for the bandwidth adjustment (C432), the VER ­ tion of the circuitry most commonly used by Tektronix. If TICAL POSITION control (R413), the Vertical Gain con ­...
  • Page 14 Circuit Description — 221 Service Fig. 4-1. Simplified block diagram of the Vertical Amplifier circuit. One half of the dual output amplifier stage is an receives a common output signal from the collector of operational amplifier consisting of transistors Q452, Q452 and the emitter of Q456.

  • Page 15: Trigger Sweep

    Circuit Description — 221 Service TRIGGER SOURCE FOLLOWER Fig. 4 2. Simplified block diagram of the Trigger Sweep circuit. Trigger/Sweep tion for the crt. The block diagram of the Trigger/Sweep circuit is shown in Fig. 4-2. The schematic of the circuit is The T rigger Sweep circuit performs two functions.
  • Page 16 Circuit Description — 221 Service The output of the differential amplifier (Q226-Q234) is retrace current through R333. The sweep runs back up coupled through emitter follower Q236 to the Schmitt until Q330 turns on and sets the sweep start voltage. The Trigger, composed of transistors Q244 and Q246.

  • Page 17: Horizontal Amplifier

    Circuit Description — 221 Service Fig. 4-3. Simplified block diagram of the Horizontal Output Amplifier circuit. Horizontal Amplifier Current output from the collector of Q526, which is proportional to the output signal, is applied through the The Horizontal Output Amplifier provides amplification...

  • Page 18: Power Supply

    C (C623), permitting the Power Inverter to remain constant. In this way a correct output level is maintanined The 221 Power Supply circuit is divided into three over the specified line voltage range and operating sections; the Power Inverter, the +5 V — 5 V Regulator, and conditions.
  • Page 19 Power Inverter circuit. When the 221 is operated from the battery source, CR634 serves to connect the power to the instrument. When the 221 is connected to a power line, diode CR634 becomes reversed biased, which permits the error amplifier (Q634) to function. A start-up circuit...

  • Page 20: Crt Circuit

    Circuit Description — 221 Service Fig. 4-5. Simplified block diagram of the CRT circuit. the Secondary Inverter stage and serves as a reference for CRT Circuit the regulating circuit. The CRT circuit provides the high voltage and control circuits necessary for operation of the crt. A block diagram of the CRT circuit is shown in Fig.

  • Page 21: Tektronix Field Service

    To assure instrument accuracy, check the calibration of assumed to be correctly calibrated and operating within the the 221 every 1000 hours of operation, or every six months listed specification. Detailed operating instructions for the if used infrequently. Before calibrating the 221, thoroughly test equipment are not given in this procedure.

  • Page 22: Preliminary Procedure

    Calibration — 221 Service Table 5-1 (cont) TEST EQUIPMENT REQUIRED Examples of Applicable Description Minimum Specifications Usage Test Equipment 7. Cable Impedance, 50 ohms; type, External trigger operation check. Tektronix Part Number RG-58/U, length, 42 inches, Horizontal gain check 012-0057-01.

  • Page 23: Index To Calibration Procedure

    Calibration — 221 Service INDEX TO CALIBRATION PROCEDURE 13. Check/Adjust Attenuator Compensa ­ tion Page Power Supply and Charger 14. Check/Adjust Vertical Gain 1. Check/Adjust Low-voltage Supply 15. Check/Adjust Vertical Step Response 2. Check/Adjust High-voltage Supply 16. Check/Adjust Vertical Bandwidth 3.

  • Page 24: Power Supply

    Use the variable auto transformer and 1:2 power position. step-up transformer to provide a 90 to 250 Vac line source. Connect the 221 oscilloscope to the line. c. Check the digital voltmeter for a reading of 0.2 volt +0.02 volt.

  • Page 25: Check Battery Charger Operation

    Calibration — 221 Service 5. Check Battery Charger Operation a. Connect the common lead of the digital voltmeter to the second pin connector on the power supply board. Connect the other lead of the digital voltmeter to the BC test point. See Fig. 5-2.

  • Page 26: Display

    Calibration — 221 Service DISPLAY Equipment Required 2. Three-inch screwdriver 1. Time mark generator 3. Adapter (probe tip to BNC) Control Settings Preset the controls as given in the Preliminary Control 8. Check/Adjust CRT Unblanking Setting. See Fig. 5-3 and Fig. 5-4 for locations of adjust ­...

  • Page 27: Vertical System

    COUPLING switch to DC. 10. Check/Adjust Step Attenuator Balance (STEP BAL) b. Connect the square-wave generator to the 221. Use a probe tip to BNC adapter, a 50-ohm termination, and a GR a. Set the VOLTS/DIV switch to the 1 V position.

  • Page 28: Check/Adjust Attenuator Compensa ­ Tion

    Set the VOLTS/DIV switch to 2. j. Set the SEC/DIV switch to .1 m. d. Connect the standard amplitude calibrator to the 221 oscilloscope. Use a probe tip to BNC adapter. k. Set the square-wave generator to 5 kHz and adjust the output for a four-division display.

  • Page 29: Check/Adjust Vertical Step Response

    Connect the fast-rise, positive output of the square ­ on the crt screen. wave generator to the 221. Use a GR to BNC adapter, a 50-ohm termination and a probe tip to BNC adapter. e. Check that the frequency of the constant amplitude signal generator is greater than 5 MHz.

  • Page 30: Check Gate Leakage

    Check noise on trace, for less than 0.1 division (adjust INTENSITY and FOCUS for a well-defined trace. a. Connect the 221 oscilloscope to the standard ampli tude calibrator. Use a probe tip to BNC adapter and a 50-ohm BNC cable.

  • Page 31: Sweep Trigger

    Calibration — 221 Service SWEEP TRIGGER 3. Cable, 50-ohm BNC connectors Equipment Required 1. Constant amplitude signal generator 4. T Connectors, BNC 2. GR to BNC adapter 5. Probe tip to BNC adapter Control Settings 22. Check/Adjust Auto Preset Triggering Preset the controls as given in the Preliminary Control a.

  • Page 32: Horizontal System

    Calibration — 221 Service HORIZONTAL SYSTEM 3. Three inch screwdriver Equipment Required 1. BNC to dual banana plug adapter 4. Time mark generator 2. Probe tip to BNC adapter 5. Standard amplitude calibrator f. Adjust Horizontal Gain adjustment R505 for a Control Settings five-division display.

  • Page 33: Check/Adjust Sweep Cal (Timing)

    Calibration — 221 Service j. Set the time mark generator for 1 µs time marks. e. Increase the frequency of the constant amplitude signal generator to 500 kHz without changing the signal amplitude. k. Check that the time marks align with the graticule (disregard the first 0.5 µs of the display).

  • Page 34: Troubleshooting Aids

    Tektronix Type 577 Curve Tracer system, to check the semiconductors used in the 221. To check waveforms in this instrument, use a test oscilloscope with a d c to five megahertz frequency response and one millivolt to 50 volts/division deflection factor.

  • Page 35: Component Color Coding

    Color code for resistors, ceramic capacitors, and dip tantalum electrolytic capacitors. Component Color Coding Isolating Trouble To A Circuit The resistors used in the 221 are either composition To isolate the trouble to a particular circuit, note the resistors or precision resistors. The resistance values are trouble symptom.
  • Page 36 Troubleshooting Aids — 221 Service Fig. 6-3. Circuit Isolation Troubleshooting Chart. REV. APR 1974...

  • Page 37: Corrective Maintenance

    Standard Parts. All electrical and mechanical part control shafts. Remove the two screws securing the instru ­ replacements for the 221 can be obtained through your ment side panel to the Input circuit board and remove the local Tektronix Field Office or representative. Many of the instrument side panel.

  • Page 38: Recalibration After Repair

    REPACKAGING FOR SHIPMENT of components mounted on most of the boards. If the Tektronix instrument is to be shipped to a Tektronix Service Center for service or repair, attach a tag showing: owner (with address) and the name of an individual at your firm that can be contacted, complete instrument serial Transistor Replacement.
  • Page 39 REPLACEABLE ELECTRICAL PARTS PARTS ORDERING INFORMATION Replacement parts are available from or through your local Tektronix, Inc. Field Office or representative. Changes to Tektronix instruments are sometimes made to accommodate Improved components as they become available, and to give you the benefit of the latest circuit improvements developed in our engineering department.
  • Page 40 Replaceable Electrical Parts — 221 Service CROSS INDEX-MFR. CODE NUMBER TO MANUFACTURER Mfr Code Manufacturer Address City, State, Zip P 0 BOX 128 00853 SANGAMO ELECTRIC CO., S. CAROLINA DIV. PICKENS, SC 29671 01121 ALLEN-BRADLEY COMPANY 1201 2ND STREET SOUTH...
  • Page 41 Replaceable Electrical Parts — 221 Service Tektronix Serial/Modei No Ckt No. Part No. Dscont Name & Description Code Mfr Part Number CKT BOARD ASSY: — INPUT 80009 670-2791-00 670-2791-00 B010100 B020517 BO2O518 B022748 CKT BOARD ASSY: — INPUT 80009 670-2791-01...
  • Page 42 Replaceable Electrical Parts — 221 Service Tektronix Serial/Model No. Ckt No. Part No. Dscont Name & Description Code Mfr Part Number C351 ) C352 ) 295-0169-00 CAP. , SET,MTCHD:1UF, 0. 01UF, 0. 001UF.MTCHD 80009 295-0169-00 C353 ) (C351 THRU C353, INDIVIDUAL TIMING...
  • Page 43 Replaceable Electrical Ports — 221 Service Tektronix Serial/Model No. Ckt No. Dscont Part No. Name & Description Code Mfr Part Number C634 B040000 290-0519-00 CAP. , FXD,ELCTLT:100UF, 20%, 20V 90201 TDC107M020WLD C644 290-0534-00 CAP. , FXD,ELCTLT : 1UF ,20%, 35V...
  • Page 44 Replaceable Electrical Parts — 221 Service Tektronix Serial/Model No. Ckt No. Part No. Dscont Name & Description Code Mfr Part Number CR536 152-0141-02 SEMICOND DEVICE:SILICON,30V,50NA 80009 152-0141-02 CR556 152-0141-02 SEMICOND DEVICE:SILICON , 30V,50NA 80009 152-0141-02 152-0141-02 CR557 SEMICOND DEVICE:SILICON,30V,50NA 80009...
  • Page 45 Replaceable Electrical Parts — 221 Service Serial/Model No. Tektronix Code Dscont Name & Description Mfr Part Number Ckt No. Part No. TRANSISTOR : SILICON , FE , N-CHANNEL , DUAL 80009 151-1057-00 Q132A.B 151-1057-00 TRANSISTOR:SILICON,VBE,MATCHED 80009 153-0612-00 B010100 B010249 Q136A,B...
  • Page 46 Replaceable Electrical Parts — 221 Service Tektronix Serial/Model No. Ckt No. Part No. Dscont Name & Description Code Mfr Part Number Q552 151-0432-00 TRANSISTOR:SILICON,NPN 80009 151-0432-00 Q554 151-0432-00 TRANSISTOR:SILICON,NPN 80009 151-0432-00 Q556 151-0432-00 TRANSISTOR:SILICON,NPN 80009 151-0432-00 Q622 151-0423-00 B010100 B010169...
  • Page 47 Replaceable Electrical Parts — 221 Service Tektronix Serial/Model No. Ckt No. Dscont Name & Description Code Mfr Part Number Part No. R177 RES. , VAR,NONWIR: 500 OHM, 10%,0. 50W 73138 72X-23-0-501K 311-1248-00 R192 RES. ,FXD,CMPSN:4 7 OHM, 5%,0. 125W 01121...
  • Page 48 Replaceable Electrical Parts — 221 Service Tektronix Serial/Model No. Ckt No. Part No. Dscont Name & Description Code Mfr Part Number R311 315-0203-00 RES. , , FXD , CMPSN : 20K OHM,5%,O.25W 01121 CB2035 R312 315-0102-00 RES. , FXD , CMPSN : IK OHM,5%,0 25W...
  • Page 49 Replaceable Electrical Parts — 221 Service Serial/Model No. Tektronix Ckt No. Dscont Name & Description Part No. Code Mfr Part Number R447 321-0255-00 RES. ,FXD,FILM:4.42K OHM, 1%,0. 125W 91637 MFF1816G44200F 321-0360-00 RES. , FXD,FILM : 54. 9K OHM,l%,0.125W R453 91637...
  • Page 50 Replaceable Electrical Parts — 221 Service Tektronix Serial/Model No. Ckt No. Part No. Dscont Name & Description Code Mfr Part Number R636 315-0271-00 RES. , FXD , CMPSN : 270 OHM,5%,0.25W 01121 CB2715 R642 315-0104-00 RES. , FXD,CMPSN:100K OHM,5%,0.25W 01121...
  • Page 51 Replaceable Electrical Parts — -221 Service Tektronix Serial/Model No. Dscont Name & Description Code Mfr Part Number Ckt No. Part No. 80009 152-0168-00 VR625 152-0168-00 XB020807 SEMICOND DEVICE : ZENER, 0 ,4W ,1 2V ,5% XB020807 SEMICOND DEVICE : ZENER ,0. 4W ,1 2V ,5%...
  • Page 52 221 Service DIAGRAMS AND CIRCUIT BOARD ILLUSTRATIONS Symbols and Reference Designators Electrical components shown on the diagrams are in the following units unless noted otherwise: Capacitors = Values one or greater are in picofarads (pF). Values less than one are in microfarads (µF).
  • Page 53 REV. Bj JULY 1974 BLOCK DIAGRAM scilloscope http://manoman .sq hi 11 .com...
  • Page 55 REV 0, FEB 1979 Note: Shield Removed Fig. 9-2. A1 — Input circuit board (back) SN B020475 & above.
  • Page 56 Located on back of board 1573-25 C233 C362 C234 C365 Fig. 9-3. Al — Input circuit board (Below SN B020475).
  • Page 57 *See Parts List for serial number ranges. tLocated on back of board. ^Soldered on emitter lead. PREAMPLIFIER Fig. 9-4 A2 — Preamplifier circuit board...
  • Page 58 Waveform Measurements The 221 Oscilloscope under test: The vertical deflection is set to 1 V with a four volt square wave connected to the probe tip, and the SEC/DIV switch is set for 0.5 m. The TRIGGER LEVEL/SLOPE set to AUTO PRESET with a triggered display.
  • Page 59 PREAMPLiFIER <> BEV B, JULV 1974 22.1 OSCILLOSCOPE...
  • Page 60 Waveform Measurements The 221 Oscilloscope under test: The vertical deflection is set to 1 V with a four volt square wave connected to the probe tip, and the SEC/DIV switch is set for 0.5 m. The TRIGGER LEVEL/SLOPE set to AUTO PRESET with a triggered display.
  • Page 61 TRIGGER/SWEEP <§> 22.1 OSC.ILLOSCO»S. 1573-23 R.EV C ,FEB 1979...
  • Page 62 FIG. 9-5. A3 — Amplifier circuit board. NOTE: CR469 and CR470 are located on reverse side of board SN B033994 & up. *See Parts List for serial number ranges.
  • Page 63 Waveform Measurements The 221 Oscilloscope under test: The vertical deflection is set to 1 V with a four volt square wave connected to the probe tip, and the SEC/DIV switch is set for 0.5 m. The TRIGGER LEVEL/SLOPE set to AUTO PRESET with a triggered display.
  • Page 64 23.7 k R5I8. -AAA 20 k: (DCPL2) HO RJ Z. MAG IHORIZ WAG| +48V ] xio i /' XI 0^0 ----------- PARTIAL Al- INPUT BOARD PARTIAL A3 ” AMPLIFIER BOARD VERTICAL^ HORIZONTAL AMPLIFIERS <g> 221. OSCI LLOSCOoe REV.C .MAYJ978 IST3-3O...
  • Page 65 REV C, DEC. 1974 On back of board: FIG. 9-6. A4 — Power supply circuit board (above) SNB020475 R624 VR625 R627 VR626...
  • Page 66 FIG. 9-7. A4 — Power supply circuit board (below) SNB020475. REV JULY 1974 ® http://manoman.sqhill.com...
  • Page 67 POWER SUPPLY <T> REV. F,MAY.I978 22.1 OSCILLOSCOPE »573-33...
  • Page 68 Waveform Measurements The 221 Oscilloscope under test: The vertical deflection is set to 1 V with a four volt square wave connected to the probe tip, and the SEC/DIV switch is set for 0.5 m. The TRIGGER LEVEL/SLOPE set to AUTO PRESET with a triggered display.
  • Page 69 FROMTTOI ( DIA&<4\ C I RCUIT OSCILLOSCOPE:...

  • Page 70: Electrical Parts Lists

    If a part you have ordered has been replaced with a new or Parts of Detail Part improved part, your local Tektronix, Inc. Field Office or Attaching parts for Parts of Detail Part representative will contact you concerning any change in part number.
  • Page 71 Replaceable Mechanical Parts — 221 Service CROSS INDEX-MFR. CODE NUMBER TO MANUFACTURER Mfr. Code Manufacturer Address City, State, Zip AMP, INC. P 0 BOX 3608 HARRISBURG, PA 17105 00779 TEXAS INSTRUMENTS, INC., SEMICONDUCTOR P 0 BOX 5012, 13500 N CENTRAL...
  • Page 72 Replaceable Mechanical Parts — 221 Service Fig. & Serial/Model No, Index Tektronix Mfr Part Number Qty 1 2 3 4 5 Name & Description Code Dscont Part No. KNOB : GRAY — VOLTS/DI 80009 366-1337-04 366-1337-04 . SPR,HLCL , TRSN :0.23 ID X 0.282 OD X 0.15"L...
  • Page 73 Replaceable Mechanical Parts — 221 Service Fig. & Tektronix Serial/Model No. Index Qty 1 2 3 4 5 Name & Description Code Mfr Part Number Part No. Dscont 1-41 361-0569-00 . SPACER,SLEEVE : 0,188 OD X 0.40 INCH LONG 80009...
  • Page 74 Replaceable Mechanical Parts — 221 Service Fig. & Serial / Model No Index Tektronix Qty 1 2 3 4 5 Name & Description Code Mfr Part Number Dscont Part No. 1-83 CRT BOARD ASSY: — POWER SUPPLY(SEE A4 EPL) . TERMINAL,PIN: 0.365 L X 0.25 PH,BRZ,G0LD PL...
  • Page 75 221 OSCILLOSCOPE 4 REV. D AUG 1976...
  • Page 76 17516 4 18 8 -BA 159-0080-00 FUSE , CARTRIDGE : 0.2 A ,2 5 0V , SLOW-BLOW 75915 213200 070-1572-00 MANUAL , TECH : OPERATORS(NOT SHOWN ) 80009 070-1572-00 070-1573-01, MANUAL,TECH:SERVICE(NOT SHOWN) 80009 070-1573-00 221 OSCILLOSCOPE REV. C FEB 1976...
  • Page 77 CALIBRATION TEST EQUIPMENT REPLACEMENT Calibration Test Equipment Chart This chart compares TM 500 product performance to that of older Tektronix equipment. Only those characteristics where significant specification differences occur, are listed. In some cases the new instrument may not be a total functional replacement. Additional support instrumentation may be needed or a change in calibration procedure may be necessary.

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