Maintenance—475
To reinstall the Trigger Generator And Sweep Logic
circuit board, reverse the order of the removal steps.
Sweep Timing Circuit Board Removal
1.
Remove the Trigger Generator And Sweep Logic
circuit board as outlined previously.
2. Remove the X I 0 MAG and UNC AL light lenses. Pry
them away from the front panel with a fingernail and pull
them straight out.
3. Remove the knobs from the VA R T IM E /D IV control
and the A A N D B T IM E /D IV switches. Be careful not to
lose the plastic bushing behind the knobs.
4. Remove the board mounting screw and the hex rod
from the Sweep Timing circuit board.
5. Remove the Sweep Timing circuit board from the
instrument. Use caution so as not to damage the connector
pins.
To reinstall the Sweep Timing board, reverse the order
of the removal steps.
Power Transformer Replacement. If the power trans
former becomes defective, contact your local T E K T R O N IX
Field Office or representative for a warranty replacement
(see warranty note in the front of this manual). Be sure to
replace only with a direct replacement T E K T R O N IX
transformer. A fter the transformer is replaced check the
performance of the complete instrument. The transformer
is removed as follows:
1. Unsolder the power cord leads.
2.
Remove the small blue panel from the rear of the
instrument. It will be necessary to remove the cover from
the Regulating Range Selector Assembly and the two feet
from that side of the instrument.
3.
Unsolder the transformer leads from the Interface
Board and from the Regulating Range Selector Assembly.
Note the wire color codes to facilitate correct reinstallation.
4.
Remove the actuating shaft from the POWER switch
coupler. Exercise caution so as not to damage the switch
coupler.
5.
Remove the POWER switch mounting bracket from
the Trigger Board.
6.
Remove the transformer leads from the Regulating
Range Selector Assembly. It will be necessary to use a
special pin removing tool available under T E K T R O N IX Part
Number 003-0707-00. It is only necessary to use this tool
to remove the transformer leads from the Selector
Assembly. The leads may be reinstalled by simply pushing
them into place. Note wire color codes to facilitate correct
reinstallation.
7.
Remove the transformer bracket mounting hardware.
This includes two screws on the Trigger Board, one screw
on the Interface Board, two nuts on the U-channel (one on
the transformer side and one on the CRT side), and two
screws and nuts on the rear subpanel.
8.
Thoroughly loosen the Trigger Board and remove the
transformer assembly from the instrument.
9.
Remove the thermal cutout and POWER switch from
the old transformer and install on the new transformer.
Note wire color codes to facilitate correct installation.
10.
Install the new transformer assembly in the instru
ment, reversing the order of the removal steps.
Recalibration After Repair
After any electrical component has been replaced, the
calibration of that particular circuit should be checked, as
well as the calibration of other closely related circuits.
Since the power supply affects all circuits, calibration of
the entire instrument should be checked if work has been
done in the power supply or if the transformer has been
replaced.
Instrument Repackaging
If the 475 is to be shipped for long distances by
commercial means of transportation, it is recommended
that the instrument be repackaged in the original manner
for maximum protection. The original shipping carton can
be saved and used for this purpose. The Repackaging
illustration in the Mechanical Parts Illustrations shows how
to repackage the 475 and gives the part numbers for the
repackaging components. New shipping cartons can be
obtained
from
Tektronix,
Inc.
Contact your
local
T E K T R O N IX Field Office or representative.
®
4-5
Summary of Contents for 475
Page 6: ...475 475 Oscilloscope ...
Page 20: ......
Page 46: ......
Page 151: ...A B C D E F G Fig 7 4 P 0 A4 Vertical Mode Switch circuit board ...
Page 152: ...n m m m 1 t siumm c ii im ...
Page 154: ...Diagrams 475 A B C D E F G ...
Page 155: ...GRID LOCATOR Fig 7 8 P O A3 Vertical Preamp circuit board ...
Page 157: ...Diagrams 475 ...
Page 158: ...GRID LOCATOR 2 3 4 5 6 7 8 9 1 10 11 1 12 Fig 7 10 P 0 A3 Vertical Preamp circuit board ...
Page 160: ...Diagrams 475 GRID LOCATOR Fig 7 11 A5 Vertical Output circuit board ...
Page 163: ...Diagrams 475 GRID LOCATOR Fig 7 12 P O A8 Trigger Generator And Sweep Logic circuit board ...
Page 167: ... 415 OSCILLOSCOPE B T R IG G E R G E N E R A T O R g B TR IG G E R GEN ER A TO R ...
Page 168: ...Diagrams 475 GRID LOCATOR ...
Page 172: ...SWEEP G E N ER A TO R S ...
Page 175: ...TIM IN G HORIZONTAL DISPLAY SWITCHING ...
Page 177: ...A 011 HORIZONTAL AMPLIFIER 8 l j k J Ll J Ol Z o N C O X U 1 C L O o v O o _J V v P O in r ...
Page 179: ... 476 OSCILLOSCOPE ...
Page 180: ...POWER SUPPLY ...
Page 182: ...CRT CIRCUIT ...
Page 185: ...C A L IB R A T O R A N D F A N C I R C U I T 4 C A LIB R A TO R FAN MOTOR C IR C U IT ...
Page 189: ......
Page 190: ...4 T 475 OSCILLOSCOPE FIG 1 FRO NT PANEL ...
Page 191: ...475 OSCILLOSCOPE FIG 2 MAIN FRAME ...
Page 199: ......
Page 200: ...FIG 3 RIGHT SIDE l 475 OSCILLOSCOPE ...
Page 201: ...V S X O t l B O T T OVJ 8 8 ...
Page 209: ......
Page 210: ...5 ...
Page 211: ...4 4 75 O S C ILLO S C O P E FIG 5 CAB IN ET ...
Page 215: ......
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Page 241: ... 1 I R I II9A po S IT I o n f i n e I R l 130 PAGE 4 OF 5 R 1234 Ml 9 91 9 473 ...