TM 11-6625-2980-14
Interconnecting Pins. To replace a pin which is
mounted on a circuit board, first disconnect any pin
connectors. Then, unsolder the damaged pin and pull it
out of the board with a pair of pliers. Be careful not to
damage the wiring on the board with too much heat.
Ream out the hole in the circuit board with a 0.031-inch
drill. Remove the ferrule from the new interconnecting
pin and press the new pin into the hole in the circuit
board. Position the pin in the same manner as the old
pin. If the old pin was bent at an angle to mate with a
connector, bend the new pin to match the associated
pins.
Cam Switches. Repair of cam type switches should
be undertaken only by experienced maintenance
personnel. Switch alignment and spring tension of the
contacts must be carefully maintained for proper
operation of the switch.
The cam-type switches consist of rotating cam
drums which are turned by front-panel knobs, and sets
of spring-leaf contacts mounted on adjacent circuit
boards. The contacts are actuated by lobes on the
cams. These switches can be disassembled for
inspection, cleaning, repair, or replacement as follows:
1. Remove the screws which hold the metal cover
on the switch, and lift the cover off the switch. The
switch is now open for inspection or cleaning.
2. To completely remove a switch from the circuit
board, first remove any knobs or shaft extensions.
Loosen the coupling at the potentiometer at the rear of
the switch, and pull the long shaft out of the switch
assembly.
3. Remove the screws (from the opposite side of
the circuit board) which hold the cam drum to the board.
4. To remove the cam drum from the front support
block, remove the retaining ring from the shaft on the
front of the switch and slide the cam drum out of the
support block. Be careful not to lose the small detent
roller.
5. To replace defective switch contacts, follow the
instructions given in the switch repair kit.
6. To re-install the switch assembly, reverse the
above procedure.
Pushbutton Switches. The pushbutton switches
are not repairable and should be replaced as a unit if
defective. Use a suction-type de-soldering tool to
remove solder from the circuit board when removing
these switches.
Light-Emitting Diodes. LED's used as indicators
are mounted on the sub-panels with plastic sleeve
sockets similar to the incandescent bulb mountings or
they are soldered directly to a sub-assembly and so
mounted that they protrude through holes in the panel.
In these cases, the sub-assembly must be exposed and
the anode and cathode lead orientations carefully noted
before unsoldering the defective LED. See figure below
for LED lead identifying information.
A-12
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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