TM 11-6625-2980-14
PARTS REPLACEMENT
Replacing
The exploded view drawings associated with the
Mechanical Parts Lists, located to the rear of most
manuals, may be especially helpful when disassembling
or reassembling individual components or sub-
assemblies.
Circuit Boards. 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 lists for the
completely wired (670 prefix) board.
To remove or replace a board, proceed as follows:
1. Disconnect all leads connected to the board
(both soldered lead connections and solderless pin
connections).
2. Remove all screws holding the board to the
chassis or other mounting surface. Some boards may be
held fast by plastic mounting clips around the board
edges. For these, push the mounting clips away from
the circuit board edges to free the board. Also, remove
any knobs, etc., that would prevent the board from being
lifted out of the instrument.
3. Lift the circuit board out of the unit. Do not force
or bend the board.
4. To replace the board, reverse the order of
removal. Use care when replacing pin connectors; if
forced into place incorrectly positioned, the pin
connectors may be damaged.
Transistors and IC's. Transistors and IC's should
not be replaced unless they are actually defective. If
removed from their sockets during routine maintenance
return them to their original sockets. Unnecessary
replacement or switching of semiconductor devices
may affect the calibration of the instruments. When a
transistor is replaced, check the operation of the part of
the instrument that may be affected.
A-10
Summary of Contents for PG 508
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Page 51: ... BACKSIDE TRANSITION TIMING BOARD Α3 ...
Page 53: ...HIGH LOW LEVEL LEVEL Trigger Generator PG 508 ...
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Page 93: ...M30603 Change Reference DESCRIP riON LEVEL CONTROL MULTIPLIER Partial ...
Page 100: ...TM 11 6625 2980 14 Figure 1 0 Pulse generator AN USM 359A vi ...
Page 145: ...TM 11 6625 2980 14 POWER MODULE INTERFACE PIN ASSIGNMENTS FRONT VIEW A 15 ...
Page 146: ...TM 11 6625 298014 DETAILED BLOCK DIAGRAM A 16 ...
Page 165: ...TM 11 6625 2980 14 FO 2 Block Diagram 4 3 4 4 blank ...
Page 166: ...TM 11 6625 2980 14 FO 3 Input circuit schematic diagram 4 5 4 6 blank ...
Page 167: ...TM 11 6625 2980 14 FO 4 Period generator schematic diagram 4 7 4 8 blank ...
Page 168: ...TM 11 6625 2980 14 FO 5 Delay generator schematic diagram 4 9 4 10 blank ...
Page 170: ...TM 11 6625 2980 14 FO 7 Transition time generator schematic diagram 4 13 4 14 blank ...
Page 171: ...TM 11 6625 2980 14 FO 8 Level control multiplier schematic diagram 4 15 4 16 blank ...
Page 172: ...TM 11 6625 2980 14 FO 9 Output amplifier schematic diagram 4 17 4 18 blank ...
Page 173: ...TM 11 6625 2980 14 FO 10 Tracking voltage supply schematic diagram 4 19 4 20 blank ...
Page 174: ...TM 11 6625 2980 14 FO 11 PG 508 power supply schematic diagram 4 21 4 22 blank ...
Page 175: ...TM 11 6625 2980 14 FO 12 TM 503 power supply schematic diagram 4 23 4 24 blank ...
Page 176: ...TM 11 6625 2980 14 FO 13 A2 board component locations 5 3 5 4 blank ...
Page 177: ...TM 11 6625 2980 14 FO 14 A3 board component locations 5 5 5 6 blank ...
Page 178: ...TM 11 6625 2980 14 FO 15 A4 board component locations 5 7 5 8 blank ...
Page 179: ...TM 11 6625 2980 14 FO 16 PG 508 exploded view 5 9 5 10 blank ...
Page 180: ...TM 11 6625 2980 14 A 17 A 18 blank ...
Page 181: ...TM 11 6625 2980 14 TM 503 POWER MODULE A 23 A 24 blank ...
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