TM 11-6625-2735-14-1
c.
d.
e.
f.
g.
h.
6.
Cable to J706 is white with a yellow stripe.
Cable to J664 is white with black and brown stripes.
Cable to J674 is white with black and red stripes.
Cable to J694 is white with black and orange stripes.
Cable to J824 is white with an orange stripe.
Cable to J584 is white with a red stripe.
Unsolder two 33-ohm resistors from the external
trigger input connectors.
7. Remove the POWER switch mounting-bracket from
the board. A 3/16-inch nut driver will be required to
remove a mounting nut.
8. Remove five board-mounting screws (two each at
left and right edges, and one screw at the top center of the
board).
9. Center A and B trigger coupling and source switches,
then remove the Trigger Generator and Z-Axis Logic
circuit-board from the instrument.
To install the Trigger Generator and Z-Axis Logic
board, reverse the removal procedure.
Timing Board Removal.
Remove the board as follows:
1. Remove the Trigger Generator and Z-Axis Logic
circuit-board as outlined previously.
2. Remove the X10 MAG and UNCAL light lenses. Pry
them away from the front panel with a fingernail and pull
them straight out.
3. Remove the VAR and TIME/DIV knobs. Set these
knobs fully clockwise and loosen their setscrews. A 1/16-
inch Allen wrench is required.
4. Remove the hexagonal post and the board
mounting-screws.
5. Remove the Timing circuit-board from the instru-
ment. Use caution to prevent damage to the connecting
pins on bottom of the board.
To install the Timing circuit-board, reverse the removal
procedure,
Vertical Output Board Removal.
Remove the board as
follows:
1. Remove the Vertical Output circuit-board shield (if
installed).
2. Disconnect the three-wire cable from the top-front
of the Vertical Output board.
3. Disconnect two wires from the board at the crt neck
pins.
4. Unsolder the delay-line ground terminal at the
delay-line connection with the board (a 40 to 60-Watt
soldering iron works best). Disconnect and dress the
delay line away from the board.
5. Unsolder the flexible grounding braid from the case
of integrated circuit U470 using a 40 to 60-Watt soldering
iron.
6. Remove the integrated-circuit mounting-nut from
the main chassis. A 1/4-inch open-end wrench may be
necessary to remove the nut.
7. Remove the two circuit-board screws along the top
edge of the board and remove the Vertical Output circuit-
board.
To install the Vertical Output circuit-board, reverse the
removal procedure.
Fan Motor Board Removal. Remove the board as
follows:
1. Remove the Virtical Preamp circuit-board as outlin-
ed previously.
2. Disconnect a two-wire ribbon-cable at the Fan
Motor board.
3. Loosen the setscrew in the fan impeller coupling
with a 0.050-inch Allen wrench.
4-26
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