may result if personnel fail to observe safety precautions
Never work on electronic equipm ent unless ther e is another per son near by who is familiar
with the operation and hazards of the equipment and who is com petent in administering
first aid. When the technician is aided by operators, he must warn them about dangerous
areas.
Whenever poss ible, the power supply to the equipment must be s hut off befor e beginning
work on the equipment. Tak e particular care to ground every capacitor likely to hold a
dangerous potential. When working inside the equipment, after the power has been
turned off, always ground every part before touching it.
Be careful not to contact high-voltage connections when installing or operating this
equipment.
Whenever the nature of the operation permits, keep one hand away from the equipment
to reduce the hazard of current flowing through vital organs of the body.
WARNING
Do not be misled by the term "low voltage." Potentials as low as 50 volts may
cause death under adverse conditions.
COMMON and probe ground straps are electr ically connected. Theref ore, an elevated
reference applied to any is present on each - as indicated by the yellow warning bands
under the probe retractable hook tips.
For Artificial Respiration, refer to FM 21-11.
EXTREMELY DANGEROUS POTENTIALS
greater than 500 volts exist in the following units:
1. CRT Power Supply
2. Horizontal Deflection System
3. Vertical Deflection System
a/(b blank)
TM 9-6625-646-14&P
Copyright 1972 by Tektronix, Inc. All rights reserved. REPRODUCED BY PERMISSION OF TEKTRONIX, INC. Distribution is limited
to use in connection with the Multiple Launch Rocket System.
Technical Manual HEADQUARTERS
DEPARTMENT OF THE ARMY
No. 9-6625-646-14&P Washington, D.C.,
8 June 1984
Operator’s, Organizational, Direct Support, and
General Support Maintenance Manual
(Including Repair Parts)
for
OSCILLOSCOPE, TEKTRONIX, MODEL 212
(NSN 6625-01-061-5519)
MULTIPLE LAUNCH ROCKET SYSTEM
REPORTING OF ERRORS
You can help improve this bulletin by calling attention to errors and by
recommending improvements and stating your reasons for the recommendations.
Your letter or DA Form 2028, Recommended Changes to Publications, s hould be
mailed directly to Commander, U.S. Army Missile Command, ATTN: DRSMISNPM, Redstone Arsenal, AL 35898. A reply will be furnished to you.
TABLE OF CONTENTS
Page
LIST OF ILLUSTRATIONS............................................................................................................................ iii
SECTION 0. GENERAL INFORMATION.......................................................................................... 0-1
This manual is, in part, authenticated manufacturer’s commercial literature. A Maintenance Allocation Chart and Recommended Spare
Parts List has been added to supplement the commercial literature. The format of this manual has not been structured to consider
levels of maintenance.
C.RECOMMENDED REPAIR PARTS LIST...................................................C-1
ii
TM 9-6625-646-14&P
LIST OF ILLUSTRATIONS
FigureTitlePage
1-1212 Oscilloscope.0-1
1-2212 Oscilloscope Accessories.1-5
2-1Side Panel Controls and Connectors.2-1
3-1Location of Screws Securing Bottom Cover and Side Panel.3-1
3-2Location of Circuit Boards Within the 212.3-2
4-1Location of Power Supply Test Points and CRT Grid Bias
Adjustment.4-4
4-2Location of Trace Rotation Adjustment.4-4
4-3Location of Vertical Centering Adjustment and Test Point.4-5
4-4Location of Attenuator Compensation Capacitors.4-7
4-5Location of Horizontal Centering Adjustment and Test Point.4-10
5-1Color Code for Resistors, Ceramic Capacitors, and Dipped Tantalum
Electrolytic Capacitors.5-1
5-2Lead Configuration of Semiconductors Used in this Instrument.5-2
6-1Vertical Input Amplifiers Detailed Block Diagram.6-2
6-2Vertical and Horizontal Output Amplifiers Detailed Block Diagram.6-3
6-3Trigger/Sweep Generator Detailed Block Diagram.6-4
6-4Power Supply Detailed Block Diagram.6-5
6-5CRT Circuit Detailed Block Diagram.6-6
7-1Selecting C210 and C212 Capacitance Values for 48 to 52
Hz Operation.7-2
7-2Selecting C210 and C212 Capacitance Values for 58 to 62
and Trigger.8-27
8-2BHorizontal and Vertical Output Sweep and Trigger
Schematic Diagram.8-27
8-3AA3 Power Supply Circuit Board, SN B040000-up.8-29
8-3BA3 Power Supply Circuit Board, below SN B040000.8-31
8-4CRT Circuit Schematic Diagram.8-33
8-5Power Supply Schematic Diagram.8-35
iii
SECTION 0 GENERAL INFORMATION
TM 9-6625-646-14&P
O-1. Scope. This manual contains instructions for the
operator, organizational, direct support, and general
support maintenance of and calibration procedures for
Tektronix Oscilloscope, Model 212. Throughout this
manual, Tektronix Oscilloscope, Model 212 is referred
to as the 212.
O-2. Indexes of Publications.
Refer to the latest issue of DA Pam 310-4 to determine
whether there are new editions, changes, or additional
publications pertaining to Tektronix Oscillos cope, Model
212.
b. DA Pam 310- 7.
Pam 310-7 to determine whether there are modification
work orders (MWO’s) pertaining to Tektronix
Oscilloscope, Model 212.
O-3. Forms, Records, and Reports. Department of
Army forms and procedures used for equipment
maintenance and calibration are those prescr ibed by TM
38-750, The Army Maintenance Management System.
Accidents involving injury to personnel or damage to
materiel will be reported on DA Form 285, Accident
Report, in accordance with AR 385-40.
Refer to the latest issue of DA
a. DA Pam 310-4.
O-4. Reporting Equipment Improvement
Recommendations (EIR). If your 212 needs
improvement, let us know. Send us an EIR. You, the
user, are the only one who can tell us what you don’t like
about your equipment. Let us know why you don’t like
the design. Tell us why a procedure is hard to perform.
Put it on an SF 368 (Quality Deficiency Report). Mail it to
Commander, U.S. Army Missile Command, ATTN:
DRSMI-SNEM, Redstone Arsenal, AL 35898. We’ll send
you a reply.
O-5. Administrative Storage. To prepare the Tektronix
Oscilloscope, Model 212 for placement into and removal
from administrative storage, refer to Section 3, Chapter
4, AR 750-25-1, Maintenance of Equipment and
Supplies. Temporary storage should be acc omplished in
accordance with TB 750-25-1, Section 2, Maintenance
of Supplies and Equipment.
O-6. Destruction of Army Electronics Materiel.
Destruction of Tektronix Oscilloscope, Model 212 to
prevent enemy use shall be in accordance with TM 430002-26, Organizational Maintenance Manual,
Destruction of Equipment to Prevent Enemy Use for
Launcher, Rocket, Armored Vehicle Mounted: XM270,
Multiple Launch Rocket System.
0-1
Figure 1-1. 212 Oscilloscope.
0-2
TM 9-6625-646-14&P
SECTION 1
INTRODUCTION
TM 9-6625-646-14&P
The 212 Oscilloscope is a dual-channel portable
oscilloscope using all solid state and integrated circuitr y
(except the CRT). The s m all size of the 212 m ak es it an
extremely portable oscilloscope for on-location
maintenance in many fields of application.
The 500 kilohertz vertical system provides vertical
deflection factors from one millivolt (at a reduced
bandwidth) to 50 volts/division at the tip of either of the
two integral high-impedance probes. Both single-trace
and dualtrace modes of operation are offered. Singletrace displays are achieved by turning off either ver tical
channel with its position control. In the dual-trace mode,
the instrument automatically chops or alternates,
depending upon the sweep rate. The trigger circuits
provide stable triggering over the full bandwidth
capabilities of the vertical system.
The horizontal deflection system provides calibrated
sweep rates from 500 millisec onds to five m icrosec onds/
division. It also provides uncalibrated sweep rates, via a
variable sweep magnifier, to at least five times the
indicated sweep rate for a maximum of at least one
microsecond/ division. In addition, X-Y operation is
provided. Channel 1 supplies the horizontal (X)
deflection, with a range from less than one millivolt to 50
volts/division (at a reduced bandwidth of 50 kilohertz),
and Channel 2 the vertical (Y) deflection. The resultant
CRT display is presented on a 6 X 10 divis ion graticule
(each division equals 0.203 inch).
The 212 is operated either from AC line voltage or
from internal rechargeable batteries. The internal
batteries are recharged from the AC power line by the
integral battery charger.
This instrument will meet the following electrical
characteristics after complete instrument calibration.
These characteristics apply over an ambient temperature
of -15àC to +55àC (+5àF to +131àF), except as
otherwise indicated. W armup time for given accuracies
is five minutes.
VERTICAL DEFLECTION SYSTEM
Calibrated Range: One millivolt to 50 volt/division. 15
steps in 1-2-5 sequence.
Accuracy: Within 5% with VOLT S/DIV VAR control in
CAL position and gain correctly set at 5 mV/div.
Uncalibrated (variable) Range: Continuously variable
between calibrated settings. Extends maximum
deflection factor to at least 125 volts/division.
BANDWIDTH (with six-division reference):
10 mV/DIV to 50 V/DIV: DC to at least 500 kilohertz.
5 mV/DIV: DC to at least 400 kilohertz.
2 mV/DIV: DC to at least 200 kilohertz.
1 mV/DIV: DC to at least 100 kilohertz.
Lower Bandwidth Limit, AC (capacitively) Coupled:
about 2 hertz at all deflection factors.
INPUT RESISTANCE:
Approximately one megohm.
INPUT CAPACITANCE:
1 mV/DIV to 50 mV/DIV: Approximately 160
picofarads.
100 mV/DIV to 50 V/DIV: Approximately 140
picofarads.
MAXIMUM USABLE INPUT VOLTAGE:
50 V/DIV to .1 V/DIV: 600 volts (DC + peak AC). 600
volts peak-to-peak AC (five megahertz or less).
50 mV/DIV to 1 mV/DIV: 600 volts (DC + peak AC).
AC not over 2 kilohertz or risetime not less than 100
nanoseconds.
CHOPPED MODE:
From 500 ms/DIV to 2 ms/DIV of time base at
approximately 50 kilohertz.
ALTERNATE MODE:
From 1 ms/DIV to 5ps/DIV of time base.
INPUT IMPEDANCE MATCHING:
Matched to within approximately 10%.
DEFLECTION FACTOR:
1-1
TM 9-6625-646-14&P
GAIN ACCURACY BETWEEN CHANNELS:
Within 5% with both VOLTS/DIV VAR controls in CAL
position and gain correctly set at 5 mV/DIV.
TRIGGERING
TRIGGER SENSITIVITY:
Internal: COMP: 0.2 division from DC to 500
kilohertz.
CH 2: 0.2 division from 2 hertz to 500 kilohertz.
External:
1.0 volt from DC to 500 kilohertz.
PRESET TRIGGER LEVEL:
Triggered at preset level on positive slope of
triggering signal. Sensitivity same as stated above.
DISPLAY JITTER:
0.5 microsecond or less at 500 kilohertz.
EXTERNAL TRIGGER:
Input Resistance: Approximately one megohm.
Input Capacitance: Approximately 30 picofarads.
Maximum Usable Input Voltage: 8 volts (DC + peak
AC) 16 volts peak-to-peak AC (one megahertz or less).
calibrated settings. Extends maxim um sweep rate to at
least 1.0 microsecond/division.
CH 1 HORIZONTAL INPUT:
Calibrated Deflection Factor: 1 millivolt to 50 volts/
division.
Variable: At least five times (using HORIZ MAG).
Accuracy: Within 10% (with HORIZ MAG control in
CAL position).
Area: Six divisions vertical by 10 divisions horizontal.
Each division equals 0.203 inch.
PHOSPHOR:
P31 Standard.
ISOLATION
HORIZONTAL DEFLECTION SYSTEM
SWEEP RATE:
Calibrated Range: 500 milliseconds to five
microseconds/ division. 16 steps in 1-2-5 sequence.
Accuracy (over center eight divisions): Within 5%
with HORIZ MAG control in CAL position and timing
correctly set at 1 ms/DIV (disregard f irs t 0.5 microsecond
of total sweep length).
Linearity (any two division portion within center eight
divisions): W ithin 5% (disregard f irst 10% of total sweep
length).
Variable Magnifier: Continuously variable between
PROBE COMMON TO 212 CASE EXTERIOR: (When
battery operated with AC power plug secured in the
insulated cover.) Maxim um s afe potential between pr obe
common (floating circuit ground) and 212 case exterior
not to exceed 500 V RMS sinusoidal, or 700 V (DC +
peak AC).
PROBE COMMON TO AC LINE: Maximum safe
potential between probe common (f loating c irc uit ground)
and the AC power line is not to exceed 250 V RMS
sinusoidal minus the AC power line RMS voltage. (i.e.,
when the AC power line RMS voltage is 117 V, the
maximum allowable potential on the probe common is
250 -117 = 133 V RMS.)
1-2
AC OPERATION
CAUTION
Due to the capacitive line input
circuit, sudden voltage changes may
cause damaging input current
transients. Avoid operating this
instrument from squarewave inverter
supplies, or other sources that
produce large voltage transients.
LINE VOLTAGE RANGE: 110 to 126 volts, AC.
Batteries can not be charged during AC operation.
Instrument can be operated between 104 and 110 volts
with resulting slow discharge of internal batteries.
TM 9-6625-646-14&P
CHARGEOPERATING TEMPERATURE
TEMPERATURE15°C+20°C to +30°C+55°C
(+5°F) (+68°F to +860F) (+131°F)
0°C (+32°F)40%60%50%
+20àC to +30àC65%100%85%
(+68° F to +86à F)
40°C (+104àF)40%65% 55%
GENERAL
ENVIRONMENT:
Temperature:
LINE FREQUENCY: 58 to 62 hertz.
NOTE
Refer to Option and Corrective
Maintenance information for other
line voltages and frequencies.
MAXIMUM POWER CONSUMPTION: Three watts or
less at 126 volts, 60 hertz.
INTERNAL BATTERY OPERATION
BATTERIES: 10 rechargeable A nickel-cadmium cells.
CHARGE TIME (from AC line): 16 hours f or full charge
(instrument off during charge cycle).
POWER (BAT TERY) INDICATOR: When ex tinguished,
indicates less than 10 minutes of sc ope operating life left
in the batteries.
BATTERY EXCESSIVE DISCHARGE PROTECTION:
Instrument operation automatically interrupted when
battery charge drops to 10 volts +0.5 volt.
TYPICAL OPERATING TIME (at maximum trace
intensity after full charge cycle at +20àC to +30àC):
Three to five hours. Longest operating tim e provided at
lower trace intensity.
Operating from Batteries , -15°C to +55 àC (+5àF to
+131àF).
Charging or operating from AC line, 0°C to +40°C
(+32°F to +104àF).
Storage, -40àC to +60°C (-40àF to +140à F).
Altitude:
Operating, to 25, 000 feet (maximum operating
temperature decreased by 10C per 1, 000 f eet above 15,
000 feet).
Non-operating, to 50, 000 feet.
Humidity (operating and non-operating): 5 cycles
(120 hours) to 95% relative humidity referenced to
MIL-E-16400F.
Shock (operating and non-operating): Tested with
two shocks at 150 g, one-half sine, two millisecond
duration each direction along three major axes.
WEIGHT (without accessories):
3.4 pounds (1.5 kilograms)
DIMENSIONS (measured at maximum points):
TYPICAL CHARGE CAPACITY (reference to charge/
discharge at +20àC to +30àC):
Height: 3.0 inches (7.6 centimeters).
Width: 5.25 inches (13.2 centimeters).
Depth: 8.9 inches (22.6 centimeters).
1-3
TM 9-6625-646-14&P
OPTION INFORMATION
Your instrument may be equipped with one or more options. T his s ection desc ribes thos e options or dir ects the reader
to where the option is documented.
OPTION 1
Option 1 equips the 212 for operation from a 220 to 250 V ac 48 to 52 Hz power line source. O ption 1 parts values that
differ from the standard 212 are listed here. A power cord cable assembly, for adapting to appropriate power plugs, is
included with Option 1 instruments. Refer to the Corrective Maintenance and Diagrams sections of this manual for
additional information concerning Option 1.
*In some Option 1 instruments, the suffix number on the board may not be marked -21.
OPTION 2
Option 2 equips the 212 for operation from a 90 to 110 V ac 48 to 52 Hz power line source. Option 2 parts values that
differ from the standard 212 are listed here. Refer to the Corr ective Maintenance and Diagrams s ections of this manual
for additional information concerning Option 2.
At Tektronix, we continually strive to keep up with latest electronic developments by adding circuit and component
improvements to our instruments as soon as they are developed and tested.
Sometimes, due to printing and s hipping requirements, we can’t get these changes imm ediately into printed manuals.
Hence, your manual may contain new change information on following pages.
A single change may affect sever al sections. Since the change inform ation sheets are c arried in the manual until all
changes are permanently entered, some duplic ation may occur. If no such change pages appear following this page, your
manual is correct as printed.
SERVICE NOTE
Because of the universal parts procurement problem, some electrical parts in your instrument may be different
from those described in the Replaceable Electrical Parts List. The parts used will in no way alter or compromise
the performance or reliability of this instrument. They are installed when necessary to ensure prompt delivery to
the customer. Order replacement parts from the Replaceable Electrical Parts List.
1-6
TM 9-6625-646-14&P
CALIBRATION TEST EQUIPMENT REPLACEMENT
Calibration Test Equipment Chart
This chart compares TM 500 produc t perform ance to that of older Tek tronix equipm ent. Only those characteris tics 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.
Comparison of Main Characteristics
DM 501 replaces 7D13
PG 501 replaces107PG 501 - Risetime less than 3.5 ns into107- Risetime less than 3.0 ns into
108PG 501 - 5 V output pulse; 3.5 ns Risetime.108- 10 V output pulse; 1 ns Risetime.
111PG 501 - Risetime less than 3.5 ns; 8 ns111- Risetime 0.5 ns; 30 to 250 ns
114PG 501 + 5 V output.114- ±10 V output. Short proof output.
115PG 501 - Does not have Paired, Burst, Gated, 115- Paired, Burst, Gated, and Delayed
PG 502 replaces107
108PG 502 - 5 V output108- 10 V output.
111PG 502 - Risetime less than 1 ns; 10 ns111- Risetime 0.5 ns; 30 to 250 ns
114PG 502 -+5 V output114- 10 V output. Short proof output.
115PG 502 - Does not have Paired, Burst, Gated, 115- Paired, Burst, Gated, Delayed & Un-
2101PG 502 - Does not have Paired or Delayed2101- Paired and Delayed pulse; 10 V
067-0502-01PG 506 - Does not have chopped feature.0502-01- Comparator output can be alter-
SG 503 replaces 190,
190A, 190BSG 503 - Amplitude range 5 mV to 5.5 V p-p.190B- Amplitude range 40 mV to 10 V p-p.
191SG 503 - Frequency range 250 kHz to 250 MHz.191- Frequency range 350 kHz to 100 MHz.
067-0532-01SG 503 - Frequency range 250 kHz to 250 MHz. 0532-01- Frequency range 65 MHz to 500
TG 501 replaces 180,
180ATG 501 - Marker outputs, 5 sec to 1 ns.180A- Marker outputs, 5 sec to 1 us.
181TG 501 - Marker outputs, 5 sec to 1 ns. Sine-181- Marker outputs, 1, 10, 100, 1000,
184TG 501 - Marker outputs, 5 sec to 1 ns. Sine-184- Marker outputs, 5 sec to 2 ns. Sine-
2901TG 501 - Marker outputs, 5 sec to 1 ns. Sine-2901- Marker outputs, 5 sec to 0.1 us.
50Ω.50Ω.
Pretrigger pulse delay.Pretrigger Pulse delay.
or Delayed pulse mode; +5 V dcpulse mode; +
Offset. Has +5 V output.Short-proof output.
Pretrigger pulse delay.Pretrigger pulse delay.
Delayed & Undelayed pulse mode;delayed pulse mode; +10 V output.
Has ±5 V output.Short-proof output.
pulse. Has ±5 V output.output.
at least 1 V; High Amplitude out-output signal, 50 ns and 1 V; High
put, 60 V.Amplitude output, 100 V.
nately chopped to a reference
voltage.
MHz.
Sinewave available at 5, 2, and 1 ns.Sinewave available at 20, 10,
Trigger output - slaved to markerand 2 ns. Trigger pulses 1, 10,
output from 5 sec through 100 ns.100 Hz; 1, 10, and 100 kHz.
One time-mark can be generated at aMultiple time-marks can be
time.generated simultaneously.
wave available at 5, 2, and 1 ns.and 10, 000 us, plus 10 ns sinewave.
wave available at 5, 2, and 1 ns.wave available at 50, 20, 10, 5,
Trigger output - slaved to markerand 2 ns. Separate trigger pulses
output from 5 sec through 100 ns.of 1 and .1 sec; 10, 1, and .1 ms;
One time-mark can be generated at10 and 1 /s. Marker amplifier proa time.vides positive or negative time
marks of 25 V min. Marker
intervals of 1 and .1 sec; 10, 1,
and .1 ms; 10 and 1 us.
wave available at 5, 2, and 1 ns.Sinewave available to 50, 10,
Trigger output - slaved to markerand 5 ns. Separate trigger
output from 5 sec through 100 nspulses, from 5 sec to 0.1 us.
One time-mark can be generated atMultiple time-marks can be genea time.rated simultaneously.
10 V output.
NOTE: All TM 500 generator outputs are short-proof. All TM 500 plug-in instruments require TM 500-Series
Power Module.
1-7
TM 9-6625-646-14&P
1-8
SECTION 2
FUNCTIONS OF CONTROLS AND CONNECTORS
TM 9-6625-646-14&P
The controls and connectors neces sary for operation
of the 212 are located on the right side of the instrument.
(See Fig. 2-1.) The POWER (BATTERY) indicator is on
the front panel. A brief description of each contr ol and
connector is given here.
indicated deflection.
INPUT COUPLING-selects the method used to couple
the channel input signal to the vertical amplifier
system.
AC-the DC component of input signal is blocked.
GND-vertical amplifier input circuit is grounded.
The applied input signal is connected to ground
through a one megohm resistor to provide a
precharge path for the AC input coupling
capacitor.
DC-all components of the input signal are
passed to the vertical amplifier system input.
STEP ATTEN BALance-a screwdriver adjustment to
balance the vertical amplifier system for minimum
trace shift when switching deflection factors.
Vertical POSition-controls the vertical position of the
appropriate trace. OFF detent turns the channel
off.
VOLTS/DIV VARiable-provides a continuously variable
deflection factor between the calibrated settings of
the VOLTS/DIV switch for the appropriate vertical
channel.
VERTical GAIN-screwdriver adjustment to set the gain of
the vertical amplifier system.
AUTO PRESET-screwdriver adjustment to set the AUTO
PRESET trigger point for automatic trigger
operation.
Trigger SOURCE-selects the source of the trigger signal.
COMP-the sweep is triggered from a sample of
the vertical deflection signal after the vertical
switching.
CH 2-the sweep is triggered from a sample of
the vertical deflection signal before the vertical
switching and only from CH 2.
EXT-the sweep is triggered from the signal
applied to the EXT TRIG banana jack.
Figure 2-1. Side Panel controls and connectors.
2-1
LEVEL/SLOPE-selects the amplitude point and the s lope
of the trigger signal on which the sweep is triggered.
When the indicator dot is to the left of center, the
sweep is triggered on the positive-going slope of the
trigger signal; to the right of center, on the negative-
going slope. When the LEVEL/SLOPE control is set
to the AUTO PRESET detent, the sweep is
automatically triggered at a preset level on the
positive-going slope.
INTENSITY-controls brightness of CRT display.
TM 9-6625-646-14&P
Horizontal POSition-controls the horizontal position of the
trace.
SEC/DIV-selects horizontal sweep rate (HORIZ MAG
must be in CAL position for indic ated sweep rate) X-Y
position allows for X-Y operation; CH 2 supplies the
vertical deflection and CH 1 the horizontal deflection.
EXT TRIG-banana jack for input of an external trigger
signal.
SWP CAL-screwdriver adjustment to provide calibrated
sweep timing.
POWER-controls power to the instrument. Does not
interrupt charging current to the internal batteries
when the instrument is connected to an AC line
voltage.
FOCUS-screwdriver adjustm ent to obtain a well-defined
sweep magnification to a max imum of approxim ately
five times the sweep rate indicated by the SEC/DIV
switch.
HORIZontal GAIN-screwdriver adjustment to set the
basic gain of the horizontal amplifier system.
COMMON-banana jack to establish common ground
between the 212 and the external signal source or
equipment under test.
WARNING
COMMON and probe ground straps
are electrically connected. Therefore,
an elevated reference applied to any
is present on each - as indicated by
the yellow warning bands under the
probe retractable hook tips.
POWER ( BATTERY) Indicator-red light to indicate when
the instrument is on. When light extinguishes, less
than 10 minutes of operating life remain.
2-2
SECTION 3
PREVENTIVE MAINTENANCE
Preventive maintenance, when performed on a
regular basis, can prevent instrument breakdown and
may improve the reliability of this instrument. The
severity of environment to which the 212 is subj ected will
determine the frequency of maintenance. A convenient
time to perform preventive maintenance is preceding
recalibration of the instrument.
Disassembly
To gain access to the interior of the instrument,
unwind both the probe cords and the power cord from
the rear of the instrument. Remove the five screws in
the bottom cover of the instrument. See Fig. 3- 1. G ently
separate the bottom cover from the instrument and lay
aside. The Power Supply circuit board with the batteries
can be lifted up and pivoted out of the way. Most of the
internal workings of the instrument are now accessible.
If it is necessary to have access to the front of the
Input circuit board, remove the knobs from all of the
external control shafts. Remove the four screws
securing the side panel to the Input circuit board and
remove the instrument side panel.
TM 9-6625-646-14&P
Cleaning
The 212 should be cleaned as often as operating
conditions require. Accumulation of dir t in the inst rument
can cause component breakdown.
The high impact plastic covers provide protection
against dust in the interior of the instrument. Loos e dust
accumulated on these covers can be removed with a soft
cloth or small brush. The brush is also useful for
dislodging dirt on and around the side-panel controls.
Dirt which remains can be removed with a soft cloth
dampened in a mild detergent and water solution.
Abrasive cleaners should not be used.
It should be only occasionally necessary to c lean the
interior. The best way to clean the interior is to blow off
the accumulated dust with dry, low-velocity air. A
softbristle brush or a cotton-tipped applicator is useful for
cleaning in narrow spaces or for cleaning more delic ate
circuit components.
Figure 3-1. Location of screws securing bottom cover and
side panel.
CAUTION
Avoid the use of chemical cleaning
agents which might damage the
plastics used in this instrument.
Avoid chemicals which contain
hydrochloric acid, sodium hydroxide,
or sulfuric acid.
Visual Inspection
The 212 should be inspected occasionally for such
defects as broken connections, improperly seated
transistors, damaged circuit boards, and heat-damaged
parts.
3-1
parts. The corrective procedure for most visible defects
is apparent; however, particular care must be taken if
heat-damaged components are found. Overheating
usually indicates other trouble in the instrument;
therefore, it is important that the cause of the
overheating be corrected to prevent recurrence of the
damage.
Semiconductor Checks
Periodically checking the semiconductors in the 212 is
not recommended. The best check of semiconductor
performance is actual operation in the instrument. If it is
desired to check the performance of a semiconductor
out of the instrument, a dynamic checker such as a
TEKTRONIX Type 576 Transistor Curve Tracer is
recommended. Lead configurations of the
semiconductors used in the 212 are shown in Fig. 5-2.
An extracting tool should be used to remove the 14-,
and 16-pin flat integrated circuits to prevent damage to
the pins. If an extracting tool is not available when
removing one of these integrated circuits, pull s lowly and
evenly on both ends of the device. Try to avoid having
one end of the integrated circuit disengage from the
socket before the other, as the pins may be damaged.
When replacing semiconductors, key the
semiconductor’s index with that of its soc ket. Failure to
do so can result in damaged components.
TM 9-6625-646-14&P
Recalibration
To assure accurate measurements, check the
calibration of this instrument after each 1000 hours of
operation or every six months if used infrequently. In
addition, replacement of components may necessitate
recalibration of the affected circuits. The calibration
procedure can also be helpful in localizing certain
troubles in the instrument. In some cases, minor
troubles may be revealed or corrected by recalibration.
Figure 3-2. Location of circuit boards within the 212.
3-2
SECTION 4
CALIBRATION
TM 9-6625-646-14&P
General
To assure instrument accuracy, check the calibration
of the 212 every 1000 hours of operation, or every six
months if used infrequently. Before complete calibr ation,
throughly clean and inspect this instrument as outlined in
the Preventive Maintenance section.
The following test equipment and accessories, or their
equivalent, are required for complete calibration of the
212. Given specifications for the test equipment are the
minimum necessary for acc urate calibration. Therefore,
the specifications of any test equipment must either meet
TEST EQUIPMENT REQUIRED
or exceed those listed below. All test equipment is
Tektronix, Inc., provides complete instrument repair
and recalibration at local Field Service Centers and the
Factory Service Center. Contact your local TEKTRONIX
Field Office or representative for further information.
assumed to be correctly calibrated and operating within
the listed specifications. Detailed operating instruc tions
for the test units are not given in this procedure. Refer to
the instruction manual for the test equipment if more
information is needed.
To aid in locating a step in this procedure, an index is
given prior to the complete procedure. Completion of
each step in the Calibration procedure ensur es that this
Special Calibration Fixtures
instrument meets the electrical specifications given in the
Introduction of this manual. Where possible, instrument
performance is checked before an adjustment is made.
For best overall instrument performance, make each
adjustment to the exact setting even if the CHECK- s tep
is within the allowable tolerances.
Special TEKTRONIX Calibration fixtures are used in
this procedure only where they facilitate instrument
calibration. These special calibration fixtures are
available from Tektronix, Inc. Order by part number
through your local TEKTRONIX Field Office or
representative.
TABLE 4-1.
TEST EQUIPMENT
Description Minimum Specifications Usage Example
1. Time-Mark Generator Marker outputs, 5 microseconds to 0.1 Horizontal timing check a. TEKTRONIX 2901
second; marker accuracy, within 0.1%. and adjustment. Time-Mark Generator.
b. TEKTRONIX 184
Time-Mark Generator.
2. Standard Amplitude Amplitude accuracy, 0.25%; signal Vertical and horizontal a. TEKTRONIX
Calibrator amplitude, 5 millivolts to 100 volts; amplifier gain checks and calibration fixture Part
output signal one-kilohertz square adjustments. Number 067-0502-01.
wave.
3. Square-Wave Frequency, one kilohertz; risetime, Vertical amplifier a. TEKTRONIX Type
Generator 100 nanoseconds or less; output compensation checks and 106 Square-Wave
amplitude, 0.4 volt to 40 volts. adjustments. Generator.
4. Low-Frequency Frequency, one kilohertz to 500 Vertical Amplifier a. General Radio
Constant-Amplitude kilohertz; output amplitude, at least bandwidth check. Trigger 1310-B Oscillator.
Signal Generator 200 millivolts. operation checks.
5. DC Voltmeter Range, zero to 1000 volts; accuracy, Power supply output level a. Triplett Model
within 3%; input impedance, checks. Vertical and 630-NA.
20, 000Ω/volt. horizontal centering
adjustment. CRT grid bias b. Simpson Model 262.
adjustment.
11. AdapterConnectors, probe tip to BNC.Used throughouta. TEKTRONIX Part
procedure for signalNumber 013-0084-01.
interconnection.
12. T-ConnectorConnectors, BNC.External trigger operationa. TEKTRONIX Part
checks.Number 103-0030-00.
13. ScrewdriverThree-inch shaft, 3/32 inch bit.Used throughouta. Xcelite R-3323.
Procedure to adjust
variable resistors.
14. Low-Capacitance1 1/2-inch shaft.Used to adjust variablea. TEKTRONIX Part
Screwdrivercapacitors.Number 003-0000-00.
INDEX TO CALIBRATION PROCEDURE
Power Supply and Display
1. Check Power Supply DC Levels
2. Adjust CRT Grid Bias (internal adjustment of
R273)
3. Adjust FOCUS (external side panel adjustment
of R398)
4. Adjust Trace Rotation (internal adjustment of
R141)
Vertical System Adjustment
5. Adjust Vertical DC Centering (internal
adjustment of R101)
6. Adjust CH 1 STEP ATTENuation BALance
(external
side panel adjustment of R415)
7. Adjust CH 2 STEP ATTENuation BALance
(external side panel adjustment of R315)
8. Adjust VERTical GAIN (external side panel
adjustment of R470)
9. Check CH 2 VARiable VOLTS/DIV Range
10. Check CH 2 VOLTS/DIV Accuracy VOLTS/DIV
Range
11. Check CH 1 VOLTS/DIV Accuracy and VARiable
12. Adjust CH 1 VOLTS/DIV Switch Compensation
(internal side panel adjustment of C407, C408, C409)
13. Adjust CH 2 VOLTS/DIV Switch Compensation
(internal side panel adjustment of C307, C308, C309
14. Check CH 2 Vertical Amplifier Bandwidth
4-2
TM 9-6625-646-14&P
15. Check CH 1 Vertical Amplifier Bandwidth
Trigger Circuit Adjustment
16. Adjust AUTO PRESET (external side panel
adjustment of R375)
17. Check Trigger Circuit Operation
Horizontal System Adjustment
18. Adjust Hor izontal Centering (internal adjustm ent
of R366)
19. Adjust HORIZontal GAIN (external side panel
adjustment of R475)
20. Adjust SWEEP CALibration (external side panel
adjustment of R370)
21. Check HORIZ MAG Range
22. Check SEC/DIV Accuracy
PRELIMINARY PROCEDURE
NOTE
Titles for external controls of this
instrument are fully capitalized in this
procedure (e.g., INTEASITY). Internal
adjustments are initial capitalized
only (e.g., Grid Bias).
PRELIMINARY CONTROL SETTINGS
Preset the instrument controls to the settings given
below when starting a calibration procedure.
Channel 1 Controls
VOLTS/DIV5 m
VOLTS/DIV VARCAL
POSMidrange
INPUT COUPLINGGND
Channel 2 Controls
VOLTS/DIV5 m
VOLTS/DIV VARCAL
POSOFF
INPUT COUPLINGGND
This instrument should be adjusted at an ambient
temperature of +250C (+ 50C) for best overall accuracy.
1. Remove the instrument covers as described in
the Disassembly Instructions in the Preventive
Maintenance section.
2. Connect the instr ument to a 117 VAC 60 Hz line
source. If the batteries are not fully charged, leave the
212 connected to the line with the power switch turned
off for a period of approximately one hour before
continuing with calibration.
3. Set the instrument controls as given under
Preliminary Control Settings. Allow at least five minutes
of warmup before proceeding.
Trigger Controls
SOURCECOMP
LEVEL/SOURCEAUTO PRESET
Sweep Controls
SEC/DIV1 m
HORIZ MAGCAL
POSMidrange
Display Controls
POWERON
INTENSITYFully Counterclockwise
4-3
CALIBRATION PROCEDURE
POWER SUPPLY and DISPLAY
Equipment Required
1. DC Voltmeter 2. Three-inch Screwdriver
TM 9-6625-646-14&P
Control Setting
Preset instrument controls to the settings given under
Preliminary Control Settings.
1. Check Power Supply DC Levels
NOTE
If the instrument has been operating
satisfactorily prior to recalibration,
proceed with step 2.
a.Using the DC voltmeter, measure the DC level of
the power supplies given in Table 4-2. Observe proper
meter polarity. See Fig. 4-1 for test point locations.
TABLE 4-2.
Power Supply Accuracy
Supply Measurement
-5.6 volt -5.6 volts ±0.4 volt
+5.6 volt +5.6 volts ±0.4 volt
+65 volt +65 volts ±4 volts
-1000 volt -960 volts ±40 volts
(due to meter loading)
2 of plug P3 (negative meter lead to pin 2) on the Power
Supply Board. See Fig. 4-1.
b.Turn the INTENSITY control fully clockwise.
c.CHECK-Meter reading of +1.9 volts.
d.ADJUST-CRT Grid Bias, R273 (s ee Fig. 4-1) for
a meter reading of +1.9 volts.
e.Disconnect all test equipment. Turn the
INTENSITY control fully counterclockwise.
3. Adjust FOCUS
a.Turn CH 2 POS midrange and CH 1 POS to the
OFF detent.
b.Set the SEC/DIV switch to X-Y and adjust the
INTENSITY control for a nominal display intensity.
c.ADJUST-FOCUS, R398 (located on the 212 side
panel) for a well-defined dot.
4. Adjust Trace Rotation
a.Set the SEC/DIV switch to 1 m.
b.CHECK-Free-running sweep is parallel with a
horizontal graticule line.
c.ADJUST-Trace Rotation, R141 (see Fig. 4-2) s o
the trace is parallel with the center horizontal graticule
line.
2. Adjust CRT Grid Bias
a.Connect the DC voltmeter between pin 5 and pin
Figure 4-1. Location of power supply test points and CRT
Grid Bias
adjustment.
Figure 4-2. Location of Trace Rotation adjustment.
4-4
VERTICAL SYSTEM ADJUSTMENT
Equipment Requested
TM 9-6625-646-14&P
1.Standard Amplitude Calibrator
2.Square-Wave Generator
3.Low Frequency Constant Amplitude Signal
Generator
4.DC Voltmeter
5.GR-to-BNC Female Adapter
Control Settings
Preset instrument controls to the settings given under
Preliminary Control Settings, except as follows:
INTENSITY Visible Display
INPUT COUPLING DC
(both)
5. Adjust Vertical DC Centering
a.Connect the DC voltmeter between pin 11 of
U105 (positive meter lead to pin 11) and ground (see
Fig. 4-3).
b.Adjust CH 1 Vertical POS control for a 0 volt
meter reading.
c.CHECK-Trace should be within approximately
0.4 division of graticule center.
d.ADJUST-Vertical Centering, R101 (see Fig. 4-3)
to position the trace to the center horizontal graticule line.
e.Disconnect all test equipment.
6.Probe Tip-to-BNC Adapter
7.50-Ohm BNC Termination
8.10X 50-Ohm Attenuator
9.Three-inch Screwdriver
10.Low-Capacitance Screwdriver
6. Adjust CH 1 STEP ATTENuator BALance
a.Rotate the CH 1 VOLTS/D)V switch from 50 m
to 1 m.
b.CHECK-The CRT display for 0.1 division or less
of trace shift between adjacent switch positions when
rotating the VOLTS/DIV switch from 50 m to 1 m.
c.ADJUST-CH 1 STEP ATTEN BAL, R415
(located on the side panel) for minimum trace shift when
rotating the CH 1 VOLTS/DIV switch from 50 m to 1 m.
7. Adjust CH 2 STEP ATTENuator BALance
a.Turn the CH 1 POS control to the OFF detent
and the CH 2 POS control to midrange.
b.Rotate the CH 2 VOLTS/DIV switch from 50 m to
1 m.
c.CHECK-The CRT display for 0.1 division or less
of trace shift between adjacent switch positions when
rotating the VOLTS/DIV switch from 50 m to 1 m.
d.ADJUST-CH 2 STEP ATTEN BAL, R315
(located on the side panel) for minimum trace shift
rotating the CH 2 VOLTS/DIV switch from 50 m to 1 m.
Figure 4-3. Location of Vertical Centering adjustment and
test point.
8. Adjust VERTical GAIN
a.Set the CH 2 VOLTS/DIV switch to 5 m.
b.Connect the CH 2 probe tip to the output of the
Standard Amplitude Calibrator via a probe tip-to-BNC
adapter.
c.Set the Standard Amplitude Calibrator for a 20
millivolts output signal.
d.CHECK-The CRT display for four divisions of
deflection within 0.2 division.
e.ADJUST-VERT GAIN, R470 (located on the side
panel) for exactly four divisions of deflection.
4-5
TM 9-6625-646-14&P
9. Check CH 2 VARiable VOLTS/DIV Range
a.Rotate the CH 2 VOLTS/DIV VAR control fully
clockwise.
b.CHECK-The CRT display for 1.6 divisions or
less of deflection. 1.6 divisions of deflection indicates a
VARiable VOLTS/DIV range of at least 2.5: 1.
c.Set the VARiable VOLTS/D IV control to CAL.
10. Check CH 2 VOLTS/DIV Accuracy
a.CHECK-Using the CH 2 VOLTS/DIV switch and
Standard Amplitude Calibrator settings given in Table 43, check that the deflection factor acc uracy for CH 2 is
within 5% at each position.
TABLE 4-3.
Vertical Deflection Accuracy
VOLTS/DIVStandard Vertical Maximum
Switch AmplitudeDeflection Error For
Setting Calibrator in Ù5% Accuracy
Output Divisions
1 m 5 millivolts 5 Ù0.25 division
2 m 10 millivolts 5
5 m 20 millivolts 4 Previously set in
10 m 50 millivolts 5
20 m 0.1 volt 5
50 m 0.2 volt 4
b.Connect the CH 1 probe tip to the output of the
Standard Amplitude Calibrator via a probe tip-to-BNC
adapter.
c.CHECK-Using the CH 1 VOLTS/DIV switch and
Standard Amplitude Calibrator settings given in Table 43, that the deflection factor accuracy of CH 1 at each
position is within 5%.
d.Set the Standard Amplitude Calibrator for a 20
millivolts output signal.
e.Set the CH 1 VOLTS/DIV switch to 5 m.
f.Rotate the CH 1 VARiable VOLTS/DIV control
fully clockwise.
g.CHECK-The CRT display for 1.6 divisions or
less of deflection. 1.6 divisions of deflection indicates a
VARiable VOLTS/DIV range of at least 2.5: 1.
h.Set the VARiable VOLTS/DIV control to CAL.
12. Adjust CH 1 VOLTS/DIV Switch Compen-sation
a.Set the CH 1 VOLTS/DIV switch to 0.1 V.
b.Connect the CH 1 probe tip to the high amplitude
output of the Type 106 Square-Wave generator via a
GR-to-BNC female adapter, a 50-ohm BNC ter mination,
and a probe tip-to-BNC adapter.
c.Adjust the Square-Wave generator for a fourdivision display of a one kilohertz square wave.
d.Adjust the Triggering controls for a stable
display.
e.CHECK-The CRT display for flat-top waveform
with no more than +0.2 division, -0.1 division, or a total of
0.2 division of aberration.
NOTE
If C307, C308, C309, C407, C408, or
C409 require adjustment, it will be
necessary to remove the instrument
side panel from the Input Board.
Refer to the Disassembly Instructions
for removal procedure.
11. Check CH 1 VOLTS/DIV Accuracy and VARiable
VOLTS/DIV Range
4-6
f.ADJUST-C407 (see Fig. 4-4) for no more than
+0.2 division, -0.1 division, or a total of 0.2 division of
aberration. (Use a low-capacitance screwdriver.)
g.Set the CH 1 VOLTS/DIV switch to 1 and adjust
the Square-Wave generator for a four-division display.
h.CHECK-The CRT display for flat-top waveform
with no more than +0.2 division, -0.1 division, or a total of
0.2 division of aberration.
i.ADJUST-C408 (see Fig. 4-4) for no more than
+0.2 division, -0.1 division, or a total of 0.2 division of
aberration.
j.Set the VOLTS/DIV switch to 10, remove the 50ohm BNC termination from the test s etup, and adjust the
Square-Wave generator for a four-division display.
k.CHECK-The CRT display for a flat-top waveform
with no more than +0.2 division, -0.1 division, or a total of
0.2 division of aberration.
I.ADJUST-C409 (see Fig. 4-4) for no more than
+0.2 division, -0.1 division, or a total of 0.2 division of
aberration.
m.Disconnect CH 1 probe tip from the test setup.
Figure 4-4. Location of attenuator compensation
capacitors.
TM 9-6625-646-14&P
13. Adjust CH 2 VOLTS/DIV Switch Compensation
a.Turn CH 1 POS control to the OFF detent and
turn CH 2 POS control to midrange.
b.Set the CH 2 VOLTS/DIV switch to 0.1 V/div.
c.Connect the CH 2 probe tip to the high amplitude
output of the Type 106 Square-Wave generator via a
GR-to-BNC female adapter, a 50-ohm BNC ter mination,
and a probe tip-to-BNC adapter.
d.Adjust the Square-Wave generator for a fourdivision display of a one-kilohertz square wave.
e.CHECK-The CRT display for flat-top waveform
with no more than +0.2 division, -0.1 division, or a total of
0.2 division of aberration.
f.ADJUST-C307 (see Fig. 4-4) for no more than
+0.2 division, -0.1 division, or a total of 0.2 division of
aberration.
g.Set the CH 2 VOLTS/DIV switch to 1 and adjust
the Square-Wave generator for a four-division display.
h.CHECK-The CRT display for a flat-top waveform
with no more than +0.2 division, -0.1 division, or a total of
0.2 division of aberration.
i.ADJUST-C308 (see Fig. 4-4) for no more than
+0.2 division, -0.1 division, or a total of 0.2 division of
aberration.
j.Set the CH 2 VOLTS/DIV switch to 10, remove
the 50-ohm BNC termination from the test setup, and
adjust the Square-Wave generator for a four-division
display.
k.CHECK-The CRT display for a flat-top waveform
with no more than +0.2 division, -0.1 division, or a total of
0.2 division of aberration.
I.ADJUST-C309 (see Fig. 4-4) for no more than
+0.2 division, -0.1 division, or a total of 0.2 division of
aberration.
m.Disconnect all test equipment, and re-install the
instrument side panel.
4-7
14. Check CH 2 Vertical Amplifier Bandwidth
a. Set the CH 2 VOLTS/DIV switch to 1 m.
b. Connect the CH 2 probe tip to the output of the
Low Frequency Constant-Amplitude signal generator via
a 50-ohm BNC 10X attenuator and a probe tip-to-BNC
adapter.
c. Adjust the signal generator for a six-division
display for a one-kilohertz signal.
d. W ithout adjusting the output am plitude, increase
the output frequency until the display is reduced in
amplitude to 4.2 divisions.
e. CHECK-T he signal generator output must be at
least 100 kilohertz.
f. Set the VOLT S/DIV switch to 2m and adjust the
signal generator for a six-division display of a onekilohertz signal.
g. W ithout adjusting the output am plitude, increase
the output frequency until the display is reduced in
amplitude to 4.2 divisions.
h. CHECK-T he signal generator output must be at
least 200 kilohertz.
i. Set the VOLTS/DIV switch to 5m and adjust
the signal generator for a six-division display of a onekilohertz signal.
TM 9-6625-646-14&P
j. W ithout adjus ting the output amplitude, increase
the output frequency until the display is reduced in
amplitude to 4.2 divisions.
k. CHECK-The signal generator output frequency
must be at least 400 kilohertz.
I. Set the VOLTS/DIV switch to 10 m and adjust
the signal generator for a six-division display of a onekilohertz signal.
m. Without adjusting the output am plitude, increase
the output frequency until the display is reduced in
amplitude to 4.2 divisions.
n. CHECK-The signal generator output frequency
must be at least 500 kilohertz.
o. Remove CH 2 probe tip from the test setup.
15. Check CH 1 Vertical Amplifier Bandwidth
a. Connect CH 1 probe tip to the test setup.
b. Turn CH 2 POS to the OFF detent and CH 1
POS to midrange.
c. Set the CH 1 VOLTS/DIV switch to 1 m.
d. Repeat steps 14-c through 14-n.
4-8
TRIGGER CIRCUIT ADJUSTMENT
Equipment Required
1. Low Frequency Signal Generator
2. 42-inch 50-Ohm BNC Cable
3. BNC-T Connector
Control Settings
Preset instrument controls to the settings given under
a. Connect the CH 2 probe tip to the output of the
Low Frequency signal generator via a BNC-T connector
and a probe tip-to-BNC adapter.
b. Adjust the signal generator for a 0.2 division
display of a five-kilohertz signal.
c. CHECK-For a stable display.
d. ADJUST -AUTO PRESET, R375 (located on the
side panel) for a stable display.
17. Check Trigger Circuit Operation
TM 9-6625-646-14&P
4. BNC to Banana Plug Adapter
5. Three-inch Screwdriver
6. Probe tip-to-BNC Adapter
a. Set the CH 2 VOLTS/DIV switch to 1 V.
b. Adjust the signal generator for a one-division
display of a 500 kilohertz signal.
c. Set the CH 2 VOLTS/DIV switch to 5 V.
d. CHECK-A stable display can be obtained by
adjusting the LEVEL/SLOPE control to trigger on both
the positive-going and negative-going slopes of the
displayed waveform.
e. Return the LEVEL/SLOPE control to the AUTO
PRESET detent.
f. Set the Trigger SOURCE switch to COMP.
g. CHECK-A stable display can be obtained by
adjusting the LEVEL/SLOPE control to trigger on both
the positive-going and negative-going slopes of the
displayed waveform.
h. Set the Tr igger SOURCE switch to EXT and the
LEVEL/SLOPE control to the AUTO PRESET detent.
i. Connect the unused output of the BNC-T
connector to the 212 EXT T RIG input via a 42-inc h BNC
cable and a BNC-to-banana plug adapter.
j. CHECK-A stable display can be obtained by
adjusting the LEVEL/SLOPE control to trigger on both
the positive-going and negative-going slopes of the
displayed waveform.
4-9
1.Standard Amplitude Calibrator
2.Time-Mark Generator
3.DC Voltmeter
4.42-inch 50-ohm BNC Cable
TM 9-6625-646-14&P
HORIZONTAL SYSTEM ADJUSTMENT
Equipment Required
5.BNC-to-Banana Plug Adapter
6.Probe Tip-to-BNC Adapter
7.Three-inch Screwdriver
Control Settings
Preset instrument controls to the settings given under
18. Adjust Horizontal Centering
a.Align dot to graticule center using HORIZ POS
and CH 2 VERT POS control.
b.Connect the DC voltmeter between pin 5 of
U105 (positive meter lead to pin 5) and ground. (See
Fig. 4-5 for test point and adjustment location.)
c.CHECK-For a reading of 0 volts, +0.2 volt.
d.ADJUST-Horizontal Centering, R366 for a meter
reading of 0 volts +0.1 V.
19. Adjust HORIZontal GAIN
a.Connect the CH 1 probe tip to the output of the
Standard Amplitude Calibrator via a probe tip-to-BNC
adapter.
b.Set the Standard Amplitude Calibrator for a 20
millivolts output.
c.Set CH 1 INPUT COUPLING switch to DC.
d.CHECK-The CRT display for two dots
separated horizontally by four divisions, +0.2 division.
e.ADJUST-Horiz Gain, R475 (located on the side
panel) for four divisions of deflection between dots.
f.Disconnect all test equipment.
20. Adjust SWEEP CALibration
a.Connect the CH 1 probe tip to the output of the
Time-Mark generator via a probe tip-to-BNC adapter.
b.Set the SEC/DIV switch to 1 m and the TimeMark generator for 1 millisecond markers.
c.Set CH 2 POS to the OFF detent.
d.Adjust the CH 1 VOLTS/DIV switch for a display
approximately three divisions in amplitude.
Figure 4-5. Location of Horizontal Centering adjustment
and test point.
4-10
TM 9-6625-646-14&P
e. CHECK-T he CRT display for one time mark per
division. With the second time mark aligned with the
second vertical graticule line, the tenth tim e mark should
align with the tenth vertical graticule line within 0.4
division.
f. ADJUST-SWEEP CAL, R370 (located on the
side panel) for exactly eight divisions of deflection
between the second and tenth time marks.
21. Check Horizontal Magnification Range
a. Rotate the HOR IZ MAG control fully clockwise.
b. CHECK-The CRT display for at least five
divisions between adjacent time marks. Five-division
spacing indicates a HORIZ MAG control range of at least
5:1.
c. Return the HORIZ MAG control to the CAL
detent.
22. Check SEC/DIV Accuracy
a. CHECK-Apply the appropriate time marks and
check each position of the SEC/DIV switch for proper
timing over the center eight division portion of each
sweep, within 0.4 division.
4-11
SECTION 5
TROUBLESHOOTING AIDS
TM 9-6625-646-14&P
TROUBLESHOOTING AIDS
Complete circuit diagrams are given in the rear of this
manual. The component number and electrical value of
each component in this instrument are shown on the
diagrams along with important voltages. The portions of
the circuit mounted on circuit boards are enclosed with
blue lines.
Figure 3-2 shows the location of the circuit boards
within the instrument along with the assembly (A)
numbers. The assembly numbers are also us ed on the
diagrams to aid in locating the boards. Pictures of the
circuit boards are shown in the Diagrams section, on the
back of the page opposite the circuit diagram, to aid
cross-referencing between the diagrams and the circuit
board pictures. Each electrical component on the boards
is identified by its circuit number as well as the
interconnecting wires and/or connectors.
Component Color Coding
The resistors used in this instrument are either
composition resistors or precision resistors. The
resistance values are color-coded on the components
with EIA color-code (some precision r esistors may have
the value printed on the body). The color-code is read
starting with the stripe nearest the end of the resistor.
Composition resistors have four stripes which c onsist of
two significant figures, a multiplier, and a tolerance value
(see Fig. 5-1). Precision resistors have five stripes
consisting of three significant figures, a multiplier, and a
tolerance value.
The capacitance values of common disc capacitors
and small tubular electrolytics are marked in mic rofarads
on the side of the component body. The molded
electrolytic capacitors ar e color-coded in picofarads (see
Fig. 5-1).
The cathode end of each glass-encased diode is
indicated by a stripe, a series of stripes, or a dot.
Figure 5-1. Color code for resistors, ceramic capacitors, and dipped tantalum electrolytic capacitors.
5-1
Figure 5-2. Lead configuration of semiconductors used in this instrument.
TM 9-6625-646-14&P
Semiconductor Lead Configuration
Figure 5-2 shows the lead configurations of the
semiconductors used in this instrument.
Troubleshooting Equipment
The majority of troubleshooting to be done on the 212
can be accomplished with a 20, 000 ohms/volt VOM
such as a Triplett Model 630-NA or a Simpson Model
262. Use a dynamic transistor tester such as a
TEKTRONIX Type 576 Transistor-Curve Trac er to c heck
the semiconductor devices used in the 212. To check
waveform(s) in this instrument, use a test oscilloscope
with a DC to 500 kilohertz frequency response and one
millivolt to 50 volts/division deflection factor.
5-2
SECTION 6
CIRCUIT DESCRIPTION
TM 9-6625-646-14&P
The following circuit description begins with a
discussion of the instrument using the block diagram
located in the Diagrams section at the rear of this
manual. Then each circuit is described in detail, using
detailed diagrams where necessary to show the
interconnections between the stages in each major
circuit and the relationship of the side-panel controls to
the individual stages. In addition to the block diagram,
complete schematics are given in the Diagrams section.
Block Diagram
Signals to be displayed on the CRT are applied to the
tips of the signal probes. The signals are then amplif ied
by the appropriate channel Input Amplifier circuit,
consisting of a two-section source-follower stage and two
feedback amplifiers. The Input Amplifier circuits also
contain the vertical deflection, position (with channel onOFF), input coupling, variable attenuation, and balance
controls.
The Trigger Generator circuit initiates the sweep
signal produced by the Sweep Generator. The input
signal to the Trigger Generator can be select ed internally
either from the capacitively coupled CH 2 Input Am plifier
signal, or from the direc tly coupled COMPosite signal of
the Feedback Amplifier. The Trigger Generator input
signal can also be selected from the external signal
applied to the EXT TRIG jack. The Trigger Generator
circuit contains coupling and sourc e controls in addition
to a combination level/slope control.
The Sweep Generator circuit produces a linear
sawtooth output signal when initiated by the Trigger
Generator circuit. The slope of the sawtooth signal is
controlled by the SEC/DIV switch. The Sweep Generator
circuit also produces an unblanking gate signal
coincident with the sawtooth waveform. This gate s ignal
unblanks the CRT to permit display presentation.
The output of U370 is amplified by the Horizontal
Amplifier circuit to produce the correct horizontal
deflection for the CRT for all positions of the SEC/DIV
switch. The Horizontal Amplifier contains a variable
magnifier to increase the sweep rate up to at least a
maximum of five times in any position of the SEC/DIV
switch.
The Power Supply and CRT circuits provide all the
voltages necessary for operation of this instrument.
Circuit Operation
In the following description of the electrical operation
and relationship of the circuits in the 212, circuitry
commonly used by TEKTRONIX is only briefly explained.
If more information is desired on the commonly used
circuits, refer to the following textbooks:
Phillip Cutler, "Semiconductor Circuit Analysis",
McGraw-Hill, New York, 1964.
Lloyd P. Hunter (Ed.), "Handbook of Semiconductor
Electronics", second edition, McGraw-Hill, New York,
1962.
Jacob Millman and Herbert Taub, "Pulse, Digital, and
Switching Waveforms", McGraw-Hill, New York, 1965.
6-1
TM 9-6625-646-14&P
Vertical Input Amplifiers
Input signals for vertical deflection of the CRT of the
212 are applied to the tips of the attached probes. Each
Input Amplifier provides control of input coupling, variable
attenuation, vertical deflection factor, balance, and
vertical position (with channel on-OFF) for the
appropriate channel. Figure 6-1 shows a detailed block
diagram of the Vertical Input Amplifier circuit. A
schematic of this circuit is shown on diagram 1.
Input signals applied to the tips of the probes are
connected to the appropriate Attenuation Stage through
the INPUT COUPLING switches (S305 and S405) . The
deflection factor in each channel is determined by the
VOLTS/DIV switch (S310 or S410). In all positions of the
VOLTS/DIV switches below .1 V/DIV, the correct
deflection factor is achieved by changing the gain of
Feedback Amplifiers U320-A and U320-B. In switch
positions .1 V/DIV and up, precision attenuators are used
(in addition to changing the gain of U320-A and U320-B)
to achieve the correct deflection factors. When the
VOLTS/DIV VAR control is rotated, the signal is
attenuated across R320 or R420. This offers variable
(uncalibrated) deflection factors between the calibrated
settings of the VOLTS/DIV switch. The STEP ATTEN
BALance adjustments (R315 and R417) control the tr ace
shift when switching between deflection factors.
The 212 can be operated single trace by turning
either vertical POSition control to the OFF detent; this
disables that channel in the last feedback stage of the
Input Amplifier through the operation of the Vertical
Mode Multivibrator U440. The CH 2 trigger signal is
present regardless of the CH 2 POS control setting. In
the dual-trace mode, the instrument will automatically
chop or alternate, depending upon the sweep rate.
The Vertical and Horizontal Output Amplifiers provide
the final amplification for the deflection signals. Figure 62 shows a detailed block diagram of these Output
Amplifiers. A schematic of these c ircuits is on diagram
2.
Both amplifiers contain the same basic circuitry. The
single-ended input signals are applied to paraphase
amplifiers, U105-A and U105-B, to convert the signal into
push-pull output signals. The Vertical Paraphase
Amplifier stage contains the VERT GAIN adjustment
(R470) that sets the over-all gain of the ver tical system,
and a Vertical Centering adjustment (R101) to set DC
centering. The Horizontal Paraphase Amplifier stage
contains the HORIZ GAIN adjustment (R475), the
HORIZ MAG control (R476), and the Horizontal POSition
control (R480). The output signals from the Paraphase
Amplifiers receive final amplification in the c ommon bas e
Output Amplifier stages.
Figure 6-2. Vertical and Horizontal output amplifiers detailed block diagram.
6-3
TM 9-6625-646-14&P
Trigger/Sweep Generator
Integrated circuit U370 is a combination
Trigger/Sweep Generator. The Trigger portion derives
trigger signals internally, either from the capacitively
coupled CH 2 Vertical Input Amplifier, or from the direc tly
coupled COMPosite signal from the input of the Vertic al
Output Amplifier. The Trigger portion can also select
signals from an external signal applied to the EXT TRIG
banana jack. Controls are provided in this circuit to
select trigger level, slope, and source. Figure 6- 3 shows
a detailed block diagram of the Tr igger/Sweep G enerator
circuit. A schematic of this circuit is on diagram 2.
The Sweep Generator portion of U370 serves a
multiple purpose. In all positions of the SEC/DIV switch
except X-Y, the Sweep Generator is an integrator, which
generates a linear sawtooth voltage waveform. The
slope of the sawtooth voltage is controlled by the setting
of the SEC/DIV switch. U370 also produces an
unblanking gate signal coincident with the sawtooth
waveform. This gate signal is amplified by Unblanking
Amplifier Q134 and applied to the CRT to unblank the
CRT during sweep presentation. In addition, the Sweep
Generator supplies the clock pulses to the Vertical Mode
Multivibrator for alternate switching between channels.
In the X-Y position, the Sweep Generator section
becomes a feedback amplifier to amplify the signal
applied to the probe tip of CH 1.
The Power Supply provides the power necessary to
operate this instrument or, if the instrument is turned off,
to recharge the batteries. Figure 6-4 shows a detailed
block diagram of this circuit. A schematic of this circuit is
shown on diagram 4.
When the instrument is connected to a power line the
AC power is capacitively coupled to the Power Rectifier.
The rectified DC is used to either run the instrument or
recharge the internal batteries. The batteries act as a
large filter capacitor for the Input Rectifier in the AC line
mode of TM 9-6625-646-14&P operation. When the
instrument is not connected to a power line, operating
power is provided by the batteries. The POWER
(BATTERY) indicator, light emitting diode DS310, is
illuminated when the 212 is operating from line voltage or
adequately charged batteries. When about 10 minutes
of operating time remains, the battery charge drops to a
point where DS310 will extinguish. The Discharge
Protection circuit (0231, Q235) prevents the Converter
Multivibrator (Q242, Q249) from func tioning, and thereby
overdischarging the ’batteries, when the charge level of
the batteries falls below approximately 10 volts. The
Converter Multivibrator changes DC into AC, which is
applied across T250 and then rectified into the
appropriate DC voltages in the Rectifier circuit.
Figure 6-4. Power Supply detailed block diagram.
6-5
TM 9-6625-646-14&P
CRT Circuit
The CRT circuit provides the high voltage and contr ol
circuits necessary for oper ation of the cathode-ray tube
(CRT). Figure 6-5 shows a detailed block diagram of the
CRT circuit. A schematic of this circuit is given on
diagram 3.
Rectifiers CR261 through CR268 provide the negative
accelerating potential for the CRT. Voltage output is
approximately -1000 volts at the CRT cathode. Filament
voltage for the CRT is provided by a spearate winding of
the power transformer. Display intensity and focus are
controlled by R395 and R398 respectively. The Trace
Rotation adjustment controls the current through L300
and affects both the vertical and horizontal alignment of
the CRT beam.
Figure 6-5. CRT Circuit detailed block diagram.
6-6
SECTION 7
CORRECTIVE MAINTENANCE
TM 9-6625-646-14&P
Obtaining Replacement Parts
Standard Parts. All electrical and mechanical part
replacements for the 212 c an be obtained through your
local TEKTRON IX Field Office or representative.
However, many of the standard electronic components
can be obtained locally in less time than is required to
order them from Tektronix, Inc. Before purchasing or
ordering replacement parts, c hec k the parts list for value,
tolerance, rating, and description.
NOTE
When selecting replacement parts, it
is important to remember that the
physical size and shape of a
component may affect its
performance in the instrument. All
replacement parts should be direct
replacements unless it is known that
a different component will not
adversely affect the instruments
performance.
Special Parts. In addition to the standard electronic
components, som e special components are used in the
212. These components ar e manufactured or selected
by Tektronix, Inc., to meet specific performance
requirements, or are m anufactured for Tektronix, Inc . in
accordance with our specifications. Most of the
mechanical parts used in this instrument have been
manufactured by Tektr onix, Inc . O rder all s pecial parts
directly from your local TEKTRONIX Field Office or
representative.
Ordering Parts. When ordering replacement
parts from Tektronix, Inc., include the following
information:
1. Instrument type.
2. Instrument serial number.
3. A description of the part (if electrical, include
circuit number).
4. TEKTRONIX Part Number.
Circuit Board Replacement. If a circuit board is
damaged beyond repair, the entire assembly including all
soldered-on components can be replaced. Part numbers
are given in the Mechanical Parts List f or the com pletely
wired board.
Semiconductor Replacement. Semiconductors
should not be replaced unless actually defective. If
removed from their sockets during routine m aintenance,
return them to their original sockets. Unnecessary
replacement of semiconductors may affect the
calibration of the instrument. W hen semiconduc tors are
replaced, check the operation of that part of the
instrument which may be affected.
Replacement semiconductors should be of the
original type or a direct replacement. Figure 5-2 shows
the lead configurations of the semiconductors used in
this instrument. Som e plastic case transistors have lead
configurations which do not agree with those shown
here. If a replacement transistor is made by a
manufacturer other than that of the or iginal, c heck the
replacement manufacturer’s basing diagram for correct
basing. All transistor sock ets in the 212 are wired for the
basing used for metal-cased transistors.
When re-inserting an integrated circuit, key the
socket’s index with that of the integrated circuit’s. Failure
to do so can result in damaged components.
Power Supply Capacitors. When operating the
Instrument on power lines other than 115 VAC 60 Hz, It
is necessary to change the electrical value of four
capacitors (C204, C215, C210, and C212) in the
instruments power input circuitry. Refer to Table 7-1 f or
the correct values of capacitance for three of the more
commonly used line voltage/line frequency combinations.
NOTE
Power line for this instrument must
be sinusoidal.
Component Replacement
WARNING
Disconnect the instrument from any
power source before replacing
components.
7-1
TM 9-6625-646-14&P
TABLE 7-1.
Power Supply Capacitors
Power Capacitor Values
Line C210 C212 C204 &C215
110 to 1.7 µf, +10% 3.3 µf, +10%, No change
126 VAC 200 V DC 200 V DC
58 to TEKTRONIX TEKTRONIX
62 Hz Part No. Part No.
285-0924-00 285-0925-00
90 to 2 µf , +10%, 4.0 µf, +10%, No change
110 VAC 200 V DC 200 V DC
48 to TEKTRONIX TEKTRONIX
52 Hz Part No. Part No.
(Option 2) 285-0934-00 285-0935-00
220 to 1 µf, +10%, 2.0 µf, +10%, .001 µf,
250 VAC 400 V DC 400 V DC 3 k V DC
48 to TEKTRONIX TEKTRONIX TEKTRONIX
52 Hz Part No. Part No. Part No.
(Option 1) 285-0932-00 285-0933-00 283-0279-00
If the instrument is to be operated on some line
voltage/line frequency combination other than one of the
above three examples, refer to Fig. 7-1 and Fig. 7-2 to
select the correct values of capacitance for C210 and
C212. For example, if the instrument is to be oper ated
on a 60 hertz line that will vary in voltage from 210 VAC
to 230 VAC, refer to Fig. 7-2. Trace across the graph on
the line representing 210 VAC to the point where that line
crosses the first curve. This point represents the
minimum values of capacitance that can be used for
correct operation. Now trace across the graph on the
line representing 230 VAC to the point where that line
crosses the second curve. This point represents the
maximum values of capacitance that can be used for
correct operation. Read off the numbers dir ectly under
these points at the bottom of the graph to find the value
of capacitance required for C210. Read off the number s
directly above these points for the value of capacitance
required for C212. Thus, C210 can be a value between
µf and 0.92 µf and C212 can be a value between
0.75
µf and 1.87 µf. The voltage ratings of these
1.54
capacitors should be at least 1.414 times the RMS value
of the applied line voltage.
Figure 7-1. Selecting C210 and C212 capacitance values for 48 to 52 Hz operation.
7-2
TM 9-6625-646-14&P
When replacing C210 and C212, be certain the foam
pad is under the replacement capacitor.
Rotary Switches. Individual parts of the VOLTS/DIV
and SEC/DIV rotary switches are replaceable. Refer to
the Parts List for the applicable part numbers for
replacement parts.
Selectable Components. Resistor R388 value is
selected for a switching unblanked trace height of no
more than 1.5 divisions for each channel and minimum
intensity change when changing sweep speed from 5 ms
to 2 ms. The value of R388 is selected from a range of
270, 300, or 330 ohms as follows:
1. Install a 270 ohm resistor for R388, turn the
212 on, set SEC/DIV to .5 s, and set INTENSITY to
maximum (fully clockwise).
2.The traces will show as dots. Set CH 1 POS to
place the CH 1 dot to the top horizontal graticule line and
set CH 2 POS to place the CH 2 dot to the bottom
horiztontal graticule line.
3.Check that no more than 1.5 divisions of
unblanked trace extends vertically from each dot.
4.If each unblanked trace exceeds 1.5 vertical
divisions, turn off the 212, install the next larger size for
R388, recheck and repeat steps 2 through 4 until
unblanked traces are no more than 1.5 divisions high
while maintaining minimum intensity change when
switching sweep speed from 5 ms to 2 ms.
Figure 7-2. Selecting C210 and C212 capacitance values for 58 to 62 Hz operation.
7-3
Repackaging For Shipment
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. Include
complete instrument s erial number and a description of
the service required.
Save and re-use the package in which your
instrument was shipped. If the original pack aging is unfit
for use or not available, repackage the instrument as
follows:
TM 9-6625-646-14&P
Surround the instrument with polyethylene sheeting to
protect the finish of the instum ent. Obtain a carton of
corrugated cardboard of the correct carton strength
and having inside dimensions of no less than six
inches more than the instrument dimenstions.
Cushion the instrument by tightly packing three inches
of dunnage or urethane foam between carton and
instrument, on all sides. Seal carton with shipping
tape or industrial stapler.
The carton test strength for your instrument is 200
pounds.
7-4
TM 9-6625-646-14&P
SECTION 8
PARTS LISTS, 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).
Resistors =Ohms (Ω)
Symbols used on the diagrams are based on USA Standard Y32.2-1967.
Logic symbology is based on MIL-STD-806B in terms of positive logic. Logic symbols depict the logic function per form ed
and may differ from the manufacturer’s data.
The following special symbols are used on the diagrams:
The following prefix letters are used as reference designators to identify components or assemblies on the diagrams.
AAssembly, separable or repairable (circuit board, etc.)LRInductor/resistor combination
ATAttenuator, fixed or variableMMeter
BMotorQTransistor or silicon-controlled rectifier
BTBatteryPConnector, movable portion
CCapacitor, fixed or variableRResistor, fixed or variable
CRDiode, signal or rectifierRTThermistor
DLDelay lineSSwitch
DSIndicating device (lamp)TTransformer
FFuseTPTest point
FLFilterUAssembly, inseparable or non-repairable
HHeat dissipating device (heat sink, heat radiator, etc.)(integrated circuit, etc.)
HRHeaterVElectron tube
JConnector, stationary portionVRVoltage regulator (zener diode, etc.)
KRelayYCrystal
LInductor, fixed or variable
8-1
TM 9-6625-646-14&P
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 accom modate improved components as they become
available, and to give you the benefit of the latest circuit improvements developed in our engineering department It is
therefore important, when ordering parts, to include the following information in your order: Part number, instrument type or
number, serial number, and modification number if applicable.
If a part you have ordered has been replaced with a new or improved part, your local Tek tronix, Inc Field Off ice or
representative will contact you concerning any change in part number.
Change information, if any, is located at the rear of this manual.
SPECIAL NOTES AND SYMBOLS
X000Part first added at this serial number
00X Part removed after this serial number
ITEM NAME
In the Parts List, an Item Name is separated from the desc ription by a colon (:). Because of space limitations, an
Item Name may sometimes appear as incomplete. For further Item Name identification, the U.S. Federal Cataloging
Handbook H6-1 can be utilized where possible.
01121ALLEN-BRADLEY COMPANY1201 2ND STREET SOUTHMILWAUKEE, WI 53204
01295TEXAS INSTRUMENTS, INC., SEMICONDUCTORP O BOX 5012, 13500 N CENTRAL
02735RCA CORPORATION, SOLID STATE DIVISIONROUTE 202SOMERVILLE, NY 08876
03508GENERAL ELECTRIC COMPANY, SEMI-CONDUCTOR
03888KDI PYROFILM CORPORATION60 S JEFFERSON ROADWHIPPANY, NJ 07981
04099CAPCO, INC.FORESIGHT INDUSTRIAL PARK,
04713MOTOROLA, INC., SEMICONDUCTOR PROD. DIV. 5005 E MCDOWELL RD, PO BOX 20923 PHOENIX, AZ 85036
07263FAIRCHILD SEMICONDUCTOR, A DIV. OF
14752ELECTRO CUBE INC.1710 S. DEL MAR AVE.SAN GABRIEL, CA 91776
15238ITT SEMICONDUCTORS, A DIVISION OF INTER
27014NATIONAL SEMICONDUCTOR CORP.2900 SEMICONDUCTOR DR.SANTA CLARA, CA 95051
32997BOURNS, INC., TRIMPOT PRODUCTS DIV.1200 COLUMBIA AVE.RIVERSIDE, CA 92507
56289SPRAGUE ELECTRIC CO.87 MARSHALL ST.NORTH ADAMS, MA 01247
71450CTS CORP.905 N. WEST BLVDELKHART, IN 46514
72982ERIE TECHNOLOGICAL PRODUCTS, INC.644 W. 12TH ST.ERIE, PA 16512
73138BECKMAN INSTRUMENTS, INC., HELIPOT DIV.2500 HARBOR BLVD.FULLERTON, CA 92634
75915LITTELFUSE, INC.800 E. NORTHWEST HWYDES PLAINES, IL 60016
76493BELL INDUSTRIES, INC.,
79727C-W INDUSTRIES550 DAVISVILLE RD., P O BOX 96WARMINISTER, PA 18974
80009TEKTRONIX, INC.P O BOX 500BEAVERTON, OR 97077
80031ELECTRA-MIDLAND CORP., MEPCO DIV.22 COLUMBIA ROADMORRISTOWN, NJ 07960
84411TRW ELECTRONIC COMPONENTS, TRW CAPACITORS112 W. FIRST ST.OGALLALA, NE 69153
90201MALLORY CAPACITOR CO., DIV. OF3029 E. WASHINGTON STREET
GROUPEXPRESSWAYDALLAS, TX 75222
PRODUCTS DEPARTMENTELECTRONICS PARKSYRACUSE, NY 13201
PO BOX 2164GRAND JUNCTION, CO 81501
FAIRCHILD CAMERA AND INSTRUMENT CORP.464 ELLIS STREETMOUNTAIN VIEW, CA 94042
NATIONAL TELEPHONE AND TELEGRAPH CORP.P.O. BOX 168, 500 BROADWAYLAWRENCE, MA 01841
MILLER, J. W., DIV.19070 REYES AVE., P O BOX 5825COMPTON, CA 90224
P. R. MALLORY AND CO., INC.P.O. BOX 372INDIANAPOLIS, IN 46206
91637 DALE ELECTRONICS, INC.P.O. BOX 609COLUMBUS, NE 68601
8-3
TM 9-6625-646-14&P
TektronixSerial/Model No.Mfr
Ckt No. Part No.EffDscontName & DescriptionCodeMfr Part Number
C306F-----------------(FURNISHED AS A UNIT WITH R306A-F)
C307281-0178-00CAP., VAR, PLSTC:1-3.5PF, 500V800312805D013R5BH02FO
C308281-0178-00CAP., VAR, PLSTC:1-3.SPF, 500V800312805D013R5BH02FO
L108108-0691-00COIL, RF:1.8MH7649302279
L111108-0691-00COIL, RF:1.8MH7649302279
L257108-0654-00COIL, RF:2.2MH7649301872
L300-----------------(FURNISHED AS A UNIT WITH CRT.)
S215260-0723-00SWITCH, SLIDE:DPDT, O.5A, 125VAC79727GF126-0028
S305260-0984-00B010100B043699SWITCH, SLIDE:DP3T, 0.5A, 125V79727G-128-S-0012
S305260-0984-01B043700SWITCH, SLIDE:DP3T W/PLASTIC PLATE79727G-128SPC/
S310-----------------(SEE RMPL FOR REPLACEMENT PARTS)
S340-----------------(FURNISHED AS A UNIT WITH R340)
S345260-0984-00B010100B034699SWITCH, SLIDE:DP3T, O.SA, 125V79727G-128-S-0012
8-10
TM 9-6625-646-14&P
TektronixSerial/Model No.Mfr
Ckt No. Part No.EffDscontName & DescriptionCodeMfr Part Number
S345260-0984-01B043700SWITCH, SLIDE:DP3T W/PLASTIC PLATE79727G-128SPC/
S360-----------------(SEE RMPL FOR REPLACEMENT PARTS)
S375-----------------(FURNISHED AS A UNIT WITH R375)
S405260-0984-00B010100B043699SWITCH, SLIDE:DP3T, O.5A, 125V79727G-128-S-0012
S405260-0984-01B043700SWITCH, SLIDE:DP3T W/PLASTIC PLATE79727G-128SPC/
S410-----------------(SEE RMPL FOR REPLACEMENT PARTS)
S440-----------------(FURNISHED AS A UNIT WITH R440)
S476-----------------(FURNISHED AS A UNIT WITH R476)
Replacement parts are available fr om 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 improvem ents developed in our engineering
department. It is therefore important, when ordering
parts, to include the following information in your order:
Part number, instrument type or number, s erial number,
and modification number if applicable.
If a part you have ordered has been replaced with a
new or improved part, your local Tektronix, Inc. Field
Office or representative will contac t you concerning any
change in part number.
Change information, if any, is located at the rear of
this manual.
SPECIAL NOTE S AND SYMBOLS
X000Part first added at this serial number
This mechanic al parts list is indented to indicate item
relationships. Following is an example of the indentation
system used in the description column.
1 2 3 4 5Name & Description
Assembly and/or Component
Attaching parts for Assembly and/or Component
Detail Part of Assembly and/or Component
Attaching parts for Detail Part
Attaching Parts always appear in the same
indentation as the item it mounts, while the detail parts
are indented to the right. Indented items are part of , and
included with, the next higher indentation. The
separation symbol indicates the end of attaching parts.
INDENTATION SYSTEM
---*---
---*--Parts of Detail Part
Attaching parts for Parts of Detail Part
---*---
00XPart removed after this serial number
FIGURE AND INDEX NUMBERS
Items in this section are referenced by figure and
index numbers to the illustrations.
Attaching parts must be purchased separately,
unless otherwise specified.
ITEM NAME
In the Parts List, an Item Name is separated from the
description by a colon (:). Because of s pace limitations,
an Item Name may sometimes appear as incomplete.
For further Item Name identification, the U.S. Federal
Cataloging Handbook H6-1 can be utilized where
possible.
ABBREVIATIONS
“INCHELCTRNELECTRONININCHSESINGLE END
#NUMBER SIZEELECELECTRICALINCANDINCANDESCENTSECTSECTION
ACTRACTUATORELCTLTELECTROLYTICINSULINSULATORSEMICONDSEMICONDUCTOR
ADPTRADAPTERELEMELEMENTINTLINTERNALSHLDSHIELD
ALIGNALIGNMENTEPLELECTRICALPARTS LIST LPHLDRLAMPHOLDERSHLDRSHOULDERED
ALALUMINUMEOPTEQUIPMENTMACHMACHINESKTSOCKET
ASSEMASSEMBLEDEXTEXTERNALMECHMECHANICALSLSLIDE
ASSYASSEMBLYFILFILLISTER HEADMTGMOUNTINGSLFLKGSELF-LOCKING
ATTENATTENUATORFLEXFLEXIBLENiPNIPPLESLVGSLEEVING
AWGAMERICAN WIRE GAGE FLHFLAT HEADNON WIRE NOT WIRE WOUNDSPRSPRING
BDBOARDFLTRFILTEROBOORDER BY DESCRIPTION SOSQUARE
BRKTBRACKETFRFRAME or FRONTODOUTSIDE DIAMETERSSTSTAINLESS STEEL
BRSBRASSFSTNRFASTENEROVHOVAL HEADSTLSTEEL
BRZBRONZEFTFOOTPH BRZPHOSPHOR BRONZESWSWITCH
BSHGBUSHINGFXDFIXEDPLPLAIN or PLATETTUBE
CABCABINETGSKTGASKETPLSTCPLASTICTERMTERMINAL
CAPCAPACITORHDLHANDLEPNPART NUMBERTHDTHREAD
CERCERAMICHEXHEXAGONPNHPAN HEADTHKTHICK
CHASCHASSISHEX HDHEXAGONAL HEADPWRPOWERTNSNTENSION
CKTCIRCUITHEX SOC HEXAGONAL SOCKETRCPTRECEPTACLETPGTAPPING
COMPCOMPOSITIONHLCPSHELICAL COMPRESSION RESRESISTORTRHTRUSS HEAD
CONNCONNECTORHLEXTHELICAL EXTENSIONRGORIGIDVVOLTAGE
COVCOVERHVHIGH VOLTAGERLFRELIEFVARVARIABLE
CPLGCOUPLINGICINTEGRATED CIRCUITRTNRRETAINERW/WITH
CRTCATHODE RAY TUBEIDINSIDE DIAMETERSCHSOCKET HEADWSHRWASHER
DEGDEGREEIDENTIDENTIFICATIONSCOPEOSCILLOSCOPEXFMRTRANSFORMER
DWRDRAWERIMPLRIMPELLERSCRSCREWXSTRTRANSISTOR
8-12
TM 9-6625-646-14&P
CROSS INDEX-MFR. CODE NUMBER TO MANUFACTURER
Mfr. CodeManufacturerAddressCity, state, Zip
00779AMP, INC.P 0 BOX 3608HARRISBURG, PA 17105
08530RELIANCE MICA CORP.342-39TH ST.BROOKLYN, NY 11232
17516MOORE, MAYNARD H., JR., INC.430 MAIN ST.STONEHAM, MA 02180
18121WILSHIRE FOAM PRODUCTS, INC.2665 COLUMBIA ST.TORRANCE, CA 90503
19209GENERAL ELECTRIC CO., ELECTRONIC
22526BERG ELECTRONICS, INC.YOUK EXPRESSWAYNEW CUMBERLAND, PA 17070
23050PRODUCT COMPONENTS CORP30 LORRAINE AVE.MT VERNON, NY 10553
71785TRW, CINCH CONNECTORS1501 MORSE AVENUEELK GROVE VILLAGE, IL 60007
73743FISCHER SPECIAL MFG. CO.446 MORGAN ST.CINCINNATI, OH 45206
75915LITTELFUSE, INC.800 E. NORTHWEST HWYDES PLAINES, IL 60016
76545MUELLER ELECTRIC CO.1583 EAST 31ST ST.CLEVELAND, OH 44114
78189ILLINOIS TOOL WORKS, INC.
79727C-W INDUSTRIES550 DAVISVILLE RD., P 0 BOX 96WARMINISTER, PA 18974
80009TEKTRONIX, INC.P O BOX 500BEAVERTON, OR 97077
80710ALLEGHENY LUDLUM STEEL CORP., A DIVISION
83385CENTRAL SCREW CO.2530 CRESCENT DR.BROADVIEW, IL 60153
98278MALCO A MICRODOT COMPANY, INC.
131-0707-00B0557709..CONNECTOR, TERM.:22-26 AWG, BRS& CU BE GOLD2252647439
131-0371-00B010100 B055769 7..CONTACT, ELEC:FOR NO.26 AWG WIRE98278122-0182-019
131-1109-00B010100 B041759 11 ..CONNECTOR, PLUG:CRIMP ON, FOR 0.4" OD PIN0077942869-6
131-1109-00B0417609..CONNECTOR, PLUG:CRIMP ON, FOR 0.4" OD PIN0077942869-6
131-1109-02B0417602..CONNECTOR, TERM:CRIMP ON, FOR 0.4" OD PIN00779P73-7444
-100214-0592-00B010100 B054369X 1..CONTACT, ELEC:0.429 INCH LONG71785318-20-00-003
-101204-0490-03B010100 B054369 1.BODY, TEST PROD:DARK GRAY80009204-0490-03
204-0594-01B054370 1.BODY ASSY, PROBE:1X80009204-0594-01
-102204-0490-05B010100 B054369 1.BODY, TEST PROD:LIGHT GRAY80009204-0490-05
204-0594-02B0543701.BODY ASSY, PROBE:1 MEG OHM/1 MEG OHM SILVER80009204-0594-02
(ATTACHING PARTS FOR CKT BD)
8-16
TM 9-6625-646-14&P
APPENDIX A
REFERENCES
DA PAM 310-4Index of Technical Manuals, Technical Bulletins, Supply Manuals (Types 7, 8, and 9), Supply
Bulletins, and Lubrication Orders.
DA PAM 310-7Index of US Army Equipment Modification Work Orders.
FM 21-11First Aid for Soldiers
AR 385-40Accident Reporting and Records.
AR 750-1Army Materiel Maintenance Concept and Policies
TB 750-25-1Maintenance Supplies and Equipment: Army Metrology and Calibration System.
TM 38-750The Army Maintenance Management System (TAMMS)
TM 43-0002-26Organizational Maintenance Manual, Destruction of Equipment to Prevent Enemy Use for Launcher,
Rocket, Armored Vehicle Mounted: XM270, Multiple Launch Rocket System
A-1/(A-2 blank)
TM 9-6625-646-14&P
APPENDIX B
MAINTENANCE ALLOCATION CHART
SECTION I. INTRODUCTION
B-1.GENERAL.
a
.This section provides a general explanation of all maintenance and repair functions authorized at various
maintenance categories.
b
.The Maintenance Allocation Chart (MAC) in Section II designates overall authority and responsibility for the
performance of maintenance functions on the identified end item or component. The application of the maintenance
functions to the end item or component will be consistent with the capacities and capabilities of the designated
maintenance categories.
c
.Section III lists the tools and test equipment (both special and common) r equired for each maintenance function
as referenced from Section II.
d
.Section IV contains supplemental instructions and explanatory notes for a particular maintenance function.
B-2.MAINTENANCE FUNCTIONS. Maintenance Functions will be limited to and defined as follows:
a.Inspect
characteristics with established standards through examination (e.g., by sight, sound, or feel).
b.Test
item and comparing those characteristics with prescribed standards.
c.Service
decontaminate, when required), to perserve, to drain, to paint, or to replenish fuel, lubricants, chemical fluids, or gases.
d.Adjust
operating characteristics to specified parameters.
e.Aline
f. Calibrate
and diagnostic equipment used in precision measurement. Cons ists of comparis ons of two instruments, one of which is a
certified standard of known accuracy, to detect and adjust any discrepancy in the accuracy of the instrument being
compared.
g.Remove/Install
functions. Install may be the act of emplacing, seating, or fixing into position a spare, repair part, or module (component or
assembly) in a manner to allow the proper functioning of an equipment or system.
h.Replace
i.Repair
and disassembly/assembly 3, procedures , and maintenance actions 4, to identify troubles and rest ore serviceability to an
item by correcting s pecific damage, fault, malfunc tion, or failure in a part, s ubas s embly, module (c omponent or as sembly) ,
end item, or system.
j.Overhaul
operational condition as required by maintenance standards in appropriate technical publications. Overhaul is normally the
highest degree of maintenance performed by the army. Overhaul does not normally return an item to like-new condition.
. To determine the serviceability of an item by comparing its physical, mechanical, and/or electrical
. To verify serviceability by measuring the mechanical, pneum atic, hydraulic, electrical characteris tics of an
. Operations required periodically to keep an item in pr oper operating condiction, i.e., to clean (includes
. To maintain or regulate, within prescr ibed lim its, by bringing into proper or exac t position, or by setting the
. To adjust specified variable elements of an item to bring about optimum or desired performance.
. To determine and cause c orrections to be made or to be adjus ted on instruments or test, meas uring,
. To remove and install the sam e item when required to perform service or other maintenance
. To remove an unserviceable item and install a serviceable counterpart in its place.
. The application of ma intenance s er vices 1, inc luding f ault loca tion/troubles hooting 2, re moval/ installation,
. That maintenance effort (service/action) prescribed to restore an item to a completely serviceable-
B-1
TM 9-6625-646-14&P
k. Rebuild
new condition in accordance with original manufacturing standards. Rebuild is the highest degree of materiel maintenance
applied to army equipment and is normally reserved for the depot category of maintenance. The rebuild operation includes
the act of returning to zero those age measurements (hours/mile, etc.) considered in classifying army
equipment/components.
malfunctioning; the act of iso lating a fault within a system or Unit Under Test (UUT).
assembly (group numbered item) to the level of its least componency identified as maintenanc e significant (i.e., assigned
an SMR code) for the category of maintenance under consideration.
B-3.EXPLANATION OF COLUMNS IN THE MAC, Section II.
a. Column 1, Group Number.
significant components, assemblies, subassemblies, and modules with the next higher assembly.
b. Column 2, Component/Assembly
modules for which maintenance is authorized.
c. Column 3, Maintenance Function.
(for detailed explanation of these functions, see paragraph B-2.)
d. Column 4, Maintenance Category
subcolumn(s), the category of maintenance authorized to perform the function listed in Column.
3. This figure represents the active time required to perform that maintenance function at the indicated category of
maintenance. If the number or complexity of the tasks within the listed maintenanc e function var y at different maintenanc e
categories, appropriate work time figures will be shown for each c ategory. The work time figure represents the average
time required to restore an item (assembly, subassembly, component, module, end item, or system) to a serviceable
condition under typical field operating conditions. This time includes preparation time (including any necessary
disassembly/assembly time), troubles hooting/fault location time, and quality assurance/quality control time in addition to
the time required to perform the specific tasks identified for the maintenance functions authorized in the maintenance
allocation chart. The symbol designations for the various maintenance categories are as follows:
. Consists of those services /actions necessary for the restoration of unserviceable equipm ent to a like-
(1)Services - inspect, test, service, adjust, aline, calibrate, and/or replace.
(2)Fault locate/troubleshoot - the process of investigating and detecting the cause of equipment
(3)Disassembly/assembly - encompasses the step-by-step taking apart (or breakdown) of a repairable
Column 1 lists group numbers, the purpose of which is to identify maintenance
. Column 2 contains the names of components, as s emblies, subassemblies , and
Column 3 lists the functions to be performed on the item listed in Colum n 2.
. Column 4 specifies, by the listing of a work time figure in the appropriate
C............................................................................................................................................................Operator or Crew
F............................................................................................................................................Direct Support Maintenance
H.......................................................................................................................................General Support Maintenance
5 This maintenance category is not included in Section II, column (4) of the Maintenanc e Allocation Chart. To identify
functions to this category of maintenance, enter a work time figur e in the "H" column of Section II, column (4) , and
use an associated reference code in the Remarks column (6). Key the code to Section IV, Remarks, and explain
the SRA complete repair application there. The explanatory remark(s) shall reference the specific Repair Parts and
Special Tools List (RPSTL) TM which contains additional SRA criteria and the authorized spare/repair parts.
B-2
TM 9-6625-646-14&P
e. Column 5, Tools and Test Equipment.
tools)and special tools, TMDE, and support equipment required to perform the designated function.
f. Column 6, Remar k s.
keyed to the remarks continued in Section IV.
B-4. EXPLANATION OF COLUMNS IN TOOL AND TEST EQUIPMENT REQUIREMENTS, Section III.
a. Column 1, Refer enc e Code.
Section III, Column 5.
This column shall, when applicable, c ontain a letter code, in alphabetic order, which s hall be
The tool and test equipment ref erence c ode correlates with a code used in the MAC,
b. Column 2, Maintenance Category.
equipment.
c. Column 3, Nomenclature.
Name or identification of the tool or test equipment.
d. Column 4, National Stock Number.
e. Column 5, Tool Number.
B-5. EXPLANATION OF COLUMNS IN REMARKS, Section IV.
a. Column 1, Reference Code.
b. Column 2, Remarks.
indicated in the MAC, Section II.
The manufacturers part number.
The code recorded in Column 6, Section II.
This column lists information pertinent to the maintenance function being performed as
Column 5 specifies, by code, those common tool sets (not individual
The lowest category of maintenance authorized to use the tool or test
The National Stock Number of the tool or test equipment.
B-3
TM 9-6625-646-14&P
SECTION II. MAINTENANCE ALLOCATION CHART
FOR
TEKTRONIX 212 OSCILLOSCOPE
(1)(2)(3)(4)(5)(6)
GROUPMAINTENANCEMAINTENANCE CATEGORYTOOLS AND
NUMBERCOMPONENT ASSEMBLYFUNCTIONCOFHDEQUIPMENT REMARKS
Fig 1TEK 212 OscilloscopeInsp.00 .05.10.10A
Test.00 .05.15.1515
Calibrate.00 .00.00.501-15B
Repair1.00C D
AOrganizational maintenance will be accomplished by the organization owning
and using the equipment.
BAll special tools and test equipment are called out in Table 4-1.
CThere will be a repair parts kit issued initially with each piece of MDE.
Resupply of parts will be through normal supply channels.
DA recommended repair parts list will be published as part of this manual.
Parts that have NSN’s assigned will be requisitioned separately and will
not be part of this kit.
B-6
TM 9-6625-646-14&P
TM 9-6625-646-14&P
APPENDIX C
RECOMMENDED REPAIR PARTS LIST FOR
TEKTRONIX 212 OSCILLOSCOPE
ITEMTEKTRONIXREC.
NO .PART NO.ITEM NAMEQTYUNIT PRICESEE NOTE 1&2
1108-0691-00COIL RF11.50 EA 5950-01-062-0627
2120-0735-00XFMR, PWR, SDN&SU123.00 EA 5950-01-110-4088
3120-1103-00TRANSFORMER, RF110.25 EASee Note 3
4136-0328-02SOCKET, PIN TERM10.20 EA 5999-01-134-3597
5136-0521-00SKT, PL-IN ELEK.17.50 EA See Note 3
6150-1061-00LT EMITTING DIO10.55 EA See Note 3
7151-0136-00TRANSISTOR 11.50 EA 5961-01-079-8653
8151-0341-00TRANSISTOR 11.00 EA *5961-00-930-5325
9151-0432-00TRANSISTOR 10.85 EA 5961-01-078-3606
10151-0504-00TRANSISTOR 11.75 EA *5961-00-485-8783
11151-1057-00TRANSISTOR 112.25 EA See Note 3
12152-0107-00SEMICOND DVC, DI 11.85 EA 5961-01-063-9264
13152-0246-00SEMICOND DVC, DI 11.00 EA *5961-00-858-5686
14152-0333-00SEMICOND DVC, DI 10.85 EA *5961-00-350-8371
15154-0699-00ELECTRON TUBE1295.00 EA5960-01-063-9667
16155-0047-00MICROCKT, LINEAR120.00 EA 5962-01-110-1645
17155-0048-01MICROCKT, DGTL 115.00 EA 5962-01-064-9571
18155-0083-00MICROCKT, LINEAR147.00 EA 5962-01-064-9556
19156-0280-00MICROKT, DGTL12.15 EA See Note 3
20159-0121-00FUSE, CARTRIDGE 100.85 EA See Note 3
21260-0984-01SWITCH, SLIDE12.80 EA *5930-00-197-1548
22281-0178-00CAP, VAR, PLASTIC13.85 EA *5910-00-454-7885
23283-0000-00CAP, FXD, CER DI 10.10 EA *5910-00-688-8702
24283-0103-00CAP, FXD, CER DI 10.65 EA *5910-00-485-4854
25283-0111-00CAP, FXD, CER DI 11.00 EA *5910-00-436-i7154
26285-0697-06CAP, FXD, PLASTIC 16.75 EA 5910-00-326-2019
27290-0535-01CAP, FXD, ELETLT 11.30 EA *5910-00-345-4638
28295-0144-00CAP SET, MATCHED111.75 SE See Note 3
29307-0307-01NTWK, HYB CKT110.00 EA See Note 3
30307-0395-00RES, FXD, FILM13.90 EA See Note 3
31311-1172-00RES, VAR, NONWW 14.10 EA See Note 3
32311-1173-00RES, VAR, NONWW 113.00 EA See Note 3
33311-1252-00RES, VAR, NONWW 12.15 EA 5905-01-064-5425
34311-1422-00RES, VAR, NONWW 19.50 EA See Note 3
35311-1422-00RES, VAR, NONWW 12.10 EA See Note 3
NOTE 1 - NSN adjacent to component indicates current use within DOD.
NOTE 2 - NSN preceded by an asterisk indicates current use within the Army.
NOTE 3 - Refer to Appendix B, Section IV, Remarks.
C-2
TM 9-6625-646-14&P
By Order of the Secretary of the Army:
JOHN A. WICKHAM, JR.
General, United States Army
Chief of Staff
Official:
ROBERT M. JOYCE
Major General, United States Army
The Adjutant General
Distribution:
To be distributed in accordance with DA Form 12-32, Section III, Direct and General Support Maintenance r equirements
for Multiple Launch Rocket System(MLRS).
TM 9-6625-646-14&P
Figure 8-0. Mechanical Parts, Exploded View
8-17/(8-18 blank)
TM 9-6625-646-14&P
Figure 8-1. Block Diagram.
8-19/(8-20 blank)
TM 9-6625-646-14&P
Figure 8-1A. A1 Input Circuit Board (Front).
Figure 8-1B. A1 Input Circuit Board (Rear).
8-21/(8-22 blank)
TM 9-6625-646-14&P
Figure 8-1C. Waveform Conditions.
TM 9-6625-646-14&P
Figure 8-1D. Vertical Amplifier
8-23/(8-24 blank)
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Figure 8-1E. Vertical Amplifier.
TM 9-6625-646-14&P
Figure 8-2. A2 Amplifier Circuit Board.
8-25/(8-26 blank)
TM 9-6625-646-14&P
Figure 8-2A. Waveform Conditions.
TM 9-6625-646-14&P
Figure 8-2B. Horizontal and Vertical Output Sweep and Trigger.
8-27/(8-28 blank)
TM 9-6625-646-14&P
Figure 8-3A. A3 Power Supply Circuit Board, SN B040000-up.
8-29/(8-30 blank)
TM 9-6625-646-14&P
Figure 8-3B. A3 Power Supply Circuit Board, below SN B040000.
8-31/(8-32 blank)
TM 9-6625-646-14&P
Figure 8-4. CRT Circuit.
8-33/(8-34 blank)
TM 9-6625-646-14&P
Figure 8-5. Power Supply.
8-35/(8-36 blank)
PIN: 055775-000
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