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
070-1573-01
TEKTRONIX
OSCILLOSCOPE
SERVICE
INSTRUCTION
MANUAL

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  • Page 1 TEKTRONIX OSCILLOSCOPE SERVICE INSTRUCTION MANUAL Tektronix, Inc. P.O. Box 500 Beaverton, Oregon 97005 070-1573-01...
  • Page 2 Tektronix, Inc. U.S.A. and foreign TEKTRONIX products covered by U.S. and foreign patents and/or patents pending. TEKTRONIX is a registered trademark o f Tektronix, Inc. h ttp ://m Q n o m Q n .s q h ill.c o m...

  • Page 3: Table Of Contents

    221 Service TABLE OF CONTENTS SECTION 1 OPERATING INFORMATION Page SECTION 5 CALIBRATION (cont) Page AND SPECIFICATIONS PRELIM INARY PROCEDURE INTRODUCTION PRELIM INARY CONTROL SETTINGS ELECTRICAL Vertical Deflection System INDEX TO CALIBRATION Triggering PROCEDURE Horizontal Deflection System POWER SUPPLY Display...
  • 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 o ff).

  • 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 hum idity. Temperature: Operating from Batteries, -1 5 °C to +55°C (+5°F to +131°F). Shock (operating and non-operating): Tested w ith two shocks at 100 g, one-half sine, tw o 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 A ll controls and connectors necessary for operation of AC—blocks dc components input signal. the 221 are located on the right side panel of the frequency lim it (—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. tim ing of the horizontal system. INTENSITY— controls brightness of crt display (detent TRACE ROTATION—...

  • 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 w ill determine the Avoid the use o f chemical cleaning agents which frequency of maintenance.

  • Page 11: Visual Inspection

    Periodically checking the semiconductors in the 221 is do so w ill result in damaged components. not recommended. The best check of semiconductor Fig. 3-2. Lead configurations of the semiconductors used in the 221 Oscilloscope. © l 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. receives a common output signal from the collector of One half of the dual output amplifier stage is an operational amplifier consisting of transistors Q452, Q452 and the emitter of Q456. Under fast, positive output...

  • Page 15: Trigger Sweep

    Circuit Description—221 Service TRIG GER SOURCE FOLLOWER Fig. 4-2. Simplified block diagram of the Trigger Sweep circuit. T rigger/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 Trigger 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 until Q330 turns on and sets the sweep start voltage. The coupled through emitter follower Q236 to the Schmitt Trigger, composed of transistors Q244 and Q246. This retrace current from the collector of Q330 then discharges , the sweep start hold-off capacitors.

  • Page 17: Horizontal Amplifier

    Circuit Description—221 Service R545 HO RIZSIG TO CRT DEFLECTION PLATES | HO BIZ MA S521 Fig. 4-3. Simplified block diagram of the Horizontal Output Amplifier circuit. Current output from the collector of Q526, which is Horizontal Amplifier proportional to the output signal, is applied through the...

  • Page 18: Power Supply

    Power Supply 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 thecrt. A block diagram of the CRT circuit is shown in Fig.

  • Page 21: Tektr O N Ix Field Service

    Detailed operating instructions for the the 221 every 1000 hours of operation, or every six months if used infrequently. Before calibrating the 221, thoroughly test equipment are not given in this procedure. Refer to the instruction manual for the test equipment if more informa­...

  • Page 22: Prelim Inary Procedure

    Calibration—221 Service Table 5-1 (cont) TEST EQUIPM ENT R EQ U IR E D Examples of Applicable Description Minimum Specifications Usage Test Equipment 7. Cable Impedance, 50 ohms; type, External trigger operation check. T e k tr o n ix...

  • Page 23: Index To Calibration Procedure

    Calibration—221 Service IN D E X TO C A LIB R A TIO N PROCEDURE 13. Check/Adjust Attenuator Compensa- tion Power Supply and Charger Page 14. Check/Adjust Vertical Gain Check/Adjust Low-voltage Supply 15. Check/Adjust Vertical Step Response 2. Check/Adjust High-voltage Supply 16.

  • 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 fo r a reading of 0.2 volt ±0.02 volt.

  • Page 25: Check Battery Charger Operation

    Calibration—221 Service 5. Check Battery Charger Operation +75 Volts 5th Pin Connector From Rear a. Connect the common lead of the digital voltmeter to the second pin connector on the power supply board. +48 Volts 4th Pin Connector From Rear Connect the other lead of the digital voltmeter to the BC test point.

  • 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: Ver Tical System

    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 term ination, and a GR a. Set the VO LTS/DIV switch to the 1 V position.

  • Page 28: Check/Adjust Attenuator Compensa- Tion

    Set the VO LTS/D IV 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 fo r 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. 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 fo r 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 TRIG G ER 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 H O R IZO N TA L SYSTEM 3. Three inch screwdriver Equipment Required 1. BNC to dual banana plug adapter 4. Time mark generator 5. Standard amplitude calibrator 2. Probe tip to BNC adapter f. Adjust Horizontal...

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

    Calibration— 221 Service j. Set the time mark generator for 1 /is time marks. e. Increase the frequency of the constant amplitude signal generator to 500 kHz w itho ut changing the signal amplitude. k. Check that the time marks align w ith the graticule (disregard the first 0.5 /is o f the display).

  • Page 34: Troubleshooting Aids

    577 Curve Tracer system, to check the semiconductors used AMPLIFIER PREAMPLIFIER in the 221. To check waveforms in this instrument, use a test oscilloscope with a dc to five megahertz frequency response and one m illivolt to 50 volts/division deflection Fig.

  • Page 35: Component Color Coding

    Fig. 6-2. 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 CHECK POWER SOURCE, TURN INSTRUMENT OFF. LINE FUSE, LINE CONNECT INSTRUMENT LOW OR TURN INSTRUMENT ON. _____ LOW OR CORD, POWER SWITCH, TO LINE SOURCE, TURN RECHARGE CHECK CHARGE INDICATOR RECHARGE BATTERIES CHARGER INSTRUMENT ON. CHECK...

  • Page 37: Corrective Maintenance

    Remove the tw o 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 SHIPM ENT o f components mounted on most o f the boards. If the Tektronix instrum ent 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 instrum ent serial Transistor Replacement.
  • Page 39 Tektronix, Inc. Field Office or representative will contact you concerning any change in part number.
  • Page 40 Replaceable Electrical Parts—221 Service CROSS INDEX— MFR. CODE NUM BER TO MANUFACTURER M fr Code Manufacturer Address City, State, Zip 00853 SANGAMO ELECTRIC CO., S. CAROLINA DIV. P 0 BOX 128 PICKENS, SC 29671 01121 ALLEN-BRADLEY COMPANY 1201 2ND STREET SOUTH...
  • Page 41 Replaceable Electrical Parts—221 Service Tektronix Serial/M odel No Ckt No. Part No. Dscont Name Description Code M fr Part Number & 670-2791-00 B010100 B020517 CKT BOARD ASSY: — INPUT 670-2791-00 80009 670-2791-01 B020518 B022748 CKT BOARD ASSY: — INPUT 80009...
  • Page 42 Replaceable Electrical Parts—221 Service Tektronix Serial/M odel 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 1% 80009 295-0169-00 C353) (C351 THRU C353, INDIVIDUAL TIMING CAPACITORS IN THIS ASSEMBLY MUST BE ORDERED...
  • Page 43 Replaceable Electrical Parts—221 Service Tektronix S erial/M odel No. M fr Ckt No. Dscont Part No. Name Description Code Mfr Part Number & C634 290-0519-00 B040000 CAP. , FXD,ELCTLT: 100UF,20%,20V 90201 TDC107M020WLD C644 290-0534-00 CAP,,FXD,ELCTLT:10F,20%,3 5V 56289 196D105X0035HA1 C647 290-0524-00 CAP., FXD, ELCTLT:4.7UF,20%,10V...
  • Page 44 Replaceable Electrical Parts—221 Service S erial/M odel No. Tektronix Code Dscont Name Description M fr Part Number Ckt No. Part No. & 80009 SEMICOND DEVICE:SILICON,30V,50NA 152-0141-02 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...
  • Page 45 Replaceable Electrical Parts—221 Service S erial/M odel No. Tektronix M fr Ckt No. Part No. Dscont Name Description Code Mfr Part Number & Q132A.B 151-1057-00 TRANSISTOR: SILICON,FE, N-CHANNEL, .DUAL 80009 151-1057-00 153-0612-00 B010100 153-0612-00 Q136A.B B010249 TRANSISTOR: SILICON, VBE.MATCHED 80009 B010250 Q136A.B...
  • Page 46 Replaceable Electrical Parts—221 Service Tektronix Serial/M odel No. Ckt No. Part No. Dscont Name Description Code Mfr Part Number & Q552 151-0432-00 TRANSISTOR:SILICON,NPN 151-0432-00 80009 Q554 151-0432-00 TRANSISTOR:SILICON,NPN 80009 151-0432-00 Q556 151-0432-00 TRANSISTOR:SILICON,NPN 151-0432-00 80009 Q622 151-0423-00 B010100 B010169 TRANSISTOR:SILICON,NPN...
  • Page 47 Replaceable Electrical Parts—221 Service M fr S e r ia l/M o d e l N o. T e k tr o n ix E ft D s c o n t N a m e D e s c rip tio n...
  • Page 48 Replaceable Electrical Parts—221 Service Tektronix Serial/M odel No. M fr Ckt No. Part No. Dscont Name & Description Code Mfr Part Number R311 315-0203-00 RES.,FXD,CMPSN:20K OHM,5%,0.25W 01121 CB2035 R312 315-0102-00 RES.,FXD,CMPSN:IK OHM,5%,0 25W 01121 CB1025 R313 315-0202-00 RES.,FXD, CMPSN:2K OHM,5%,0.25W...
  • Page 49 Replaceable Electrical Parts—221 Service T e k t r o n i x S e r i a l / M o d e l N o . M f r C k l N o . Pa r t N o .
  • Page 50 Replaceable Electrical Parts—221 Service S erial/M odel No. Tektronix Dscont Ckt No. Part No. Name Description Code Mfr Part Number & R636 315-0271-00 RES.,FXD,CMPSN:270 OHM,5%,0.25W 01121 CB2715 RES. , FXD,CMPSN:100K OHM,5%,0.25W 01121 CB1045 R642 315-0104-00 RES., FXD,FILM:3.92K OHM,1%,0.125W 91637 MFF1816G39200F...
  • Page 51 Replaceable Electrical Parts—221 Service Tektronix S erial/M odel No. Code Mfr Part Number Ckt No. Part No. Dscont Name Description & VR625 XB020807 SEMICOND DEVICE:ZENER,0.4W,12V,5% 80009 152-0168-00 132-0168-00 XB020807 SEMICOND DEVICE: ZENER, 0.4W, 12V, 5% 80009 152-0168-00 VR626 152-0168-00 14552...
  • Page 52 221 Service DIAGRAMS CIRCUIT BOARD ILLUSTRATIONS Symbols and Reference Designators Electrical com ponents shown on the diagrams are in the fo llo w in g units unless noted otherwise: Capacitors = Values one o r greater are in picofarads (pF).
  • Page 53 dill IN P U T C O U P L IN G PROBE + 5 V A C / DC S O U R C E s c i l l o s c o p e http://manoman.sqhi[T.com...
  • Page 54 BLOCK DIAGRAM R E V . B j J U L Y 19 7 4...
  • Page 55 Note : Shield removed 0214 C127 R126 2 C363 R363 10 11 14 15 Q 212 R343 C l 28 C l 26 R222 cv .. R 127 Q 342 R417 R365 £ o o o M R124 z r. « R123 L 194 C194 Q340...
  • Page 56 20 21 22 23 24 in 16 S213 R352 R213 C362 C234 C233 plOO r r n S738 R 4 1 8 R738 R100 R112 C365 14 15 1 5 7 3 - 2 4 REV D, FEB 1979 Note: Shield Removed Fig.
  • Page 57 Q214 R676 0 2 3 6 0 2 4 6 N Located on back of board C233 C362 C234 C365 Fig. 9-3. A 1 —Input circuit board (Below SIM B020475).
  • Page 58 CR132 R137 R153 R143 — 4 R 144 R 154 R 145 R155 R146 R 134 R 147 "See Parts List for < R156 serial number ranges. T — R136 tLocated on back of board. R174 ^Soldered on R175 tC 175 R164 emitter lead.
  • Page 59 Waveform Measurements The 221 Oscilloscope under test: The vertical deflection is set to 1 V w ith a four vo lt square wave connected to the probe tip , and the SEC/DIV switch is set fo r 0.5 m. The TRIGGER LEVEL/SLOPE set to AUTO PRESET w ith a triggered display.
  • Page 60 V E R T "SIGMA*I— T O G } 4 2 2 A P R O B E RIOO PIOO J r ± i 80OK 'j___ L 192. 2 0 0 * 4 'TftnT'—v w —* - +SV R192 — £V R 1 9 4 R 4 I J D1A©<...
  • Page 61 Waveform Measurements The 221 Oscilloscope under test: The vertical deflection is set to 1 V w ith 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 w ith a triggered display.
  • Page 62 UNBLANKING SIGNAL DtAG <5> , +5V (Dcpta) -4-B V -*----- < + 5V d c p le F E O M FROM ^ SWEEP D I A & ufeSA p in TO Q502 DIAG < |> “ 5 V »— < P A R TIA L A4-PW K.
  • Page 63 Q522 Q516 R505 Q502 R533 Q526 R753 C516 C523 R502 R504 0 5 1 8 R503 Sgcv 8 > S in S R516 D C g R519 C462 CR468 CR455 R468 R458 Q 464 Q4S2 « N CR464 f «- cc CR462 CR467 Q 466...
  • Page 64 Waveform Measurements The 221 Oscilloscope under test: The vertical deflection is set to 1 V w ith a four volt square wave connected to the probe tip , and the SEC/DIV switch is set fo r 0.5 m. The TRIGGER LEVEL/SLOPE set to AUTO PRESET w ith a triggered display.
  • Page 65 / DIAS <g> SEE PARTS LIST FOR EARLIER VALUES AND SERIAL NUMBER RANGES OF PARTS OUTLINED OR DEPICTED IN BLUE. d i a g <g> 2.2-1, O S C I L L O S C O P E VER.TICA l_ $ HORIZONTAL AMPLIFIERS <g>...
  • Page 66 C617 R739 ■1000V R662 C731 C735 C733 S TP cc 5V R661 R663 P733 C732 C734 CRS33 P633 CR626 C632 R623 Q648 C623 | Q646 1 C647 T633 g CR654 L626 < C Q666 □644 0642 R626 Q626 T701 > 0622 CR624 C662...
  • Page 67 R662 C617 R739 C731 -1000V C735 C733 < 0 C623 R661 C732 R663 CR633 CR626 C734 C632 £0 A J 0648 N § 0 6 4 6 c - 47 T633 C647 S CR654S C662 > Q644 Q642 R626 Q626 Q622 T701 Q666...
  • Page 68 DIA6 < > P6I0 9 0 - 2 5 0 V AC 3 8 - 6 2 HH 8 0 - 2 5 0 V DC S E E DIA6 <§> R.EV. F ,M A Y J9 7 6 POWER SUPPLY < $ > 22.1 O S C I L L O S C O P E 1S73-33...
  • Page 69 Waveform Measurements The 221 Oscilloscope under test: The vertical deflection is set to 1 V w ith a four vo lt square wave connected to the probe tip , and the SEC/DIV switch is set fo r 0.5 m. The TRIGGER LEVEL/SLOPE set to AUTO PRESET w ith a triggered display.
  • Page 70 C R .T C I e c u IT <S> 2 Z i O S C I L L O S C O P E 1 5 7 3 - 3 4 REV C , F E S | <5 -7 < 9 W-E.

  • Page 71: Electrical Parts Lists

    P a r ts o f D e t a i l P a r t improved part, your local Tektronix, Inc. Field Office or A t t a c h i n g p a r t s f o r P a r ts o f D e t a il P a r t representative will contact you concerning any change in part number.
  • Page 72 Replaceable Mechanical Parts—221 Service CROSS IN D E X -M F R . CODE NUMBER TO M ANUFACTURER 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 73 Replaceable Mechanical Parts—221 Service Fig. & Index Tektronix Serial/M odel No. Code Mfr Part Number Part No. Dscont Qty 1 2 3 4 5 Description Name & 80009 366-1337-04 1 KNOB: GRAY— VOLTS/DI 366-1337-04 . SPR,HLCL,TRSN:0.23 ID X 0.282 OD X 0.15"L...
  • Page 74 Replaceable Mechanical Parts—221 Service Fig. & Index Tektronix S erial/M odel No. Part No. Dscont Qty 1 2 3 4 5 Name & Description Code Mfr Part Numb 1-41 361-0569-00 . . SPACER,SLEEVE!0,188 OD X 0.40 INCH LONG 80009 361-0569-00 .
  • Page 75 Replaceable Mechanical Parts—221 Service Fig. & Serial/M ode! No Index Tektronix Code Dscont Qty 1 2 3 4 5 Name Description Mfr Part Number Part No. & 1-83 CRT BOARD ASSY:— POWER SUPPLY(SEE A4 EPL) 131-0608-00 . TERMINAL,PIN:0.365 L X 0.25 PH,BRE,GOLD PL...
  • Page 77 221 OSCILLOSCOPE...
  • Page 78 0 7 0 - 1 5 7 3 - 0 1 , M A N U A L , T E C H : S E R V I C E ( N O T S H O W N ) 221 OSCILLOSCOPE REV. C FEB 1976...
  • Page 79 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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