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Maintenance
760A / 760D / 760N
4–17
REAR
A1 Power Supply board retaining screws
A3 Main board retaining screws
FRONT
J1
J3
J2 J4
Ground strap
Figure 4–4: Retaining screw locations
5. To remove the board, slide it toward the rear panel until the potentiometer
shafts clear the front and then lift it out.
6. To replace the Main board, lay the board flat and slide it back into place
(there are grooves in the front molding for the board to slide into). Perform
steps 1 through 4 above in reverse order.
1. Remove the plug from J4 on the Power Supply board (the connection to the
Main board).
2. Remove the anode connection from the CRT and discharge it to ground.
WARNING. The CRT may retain a dangerous charge. Ground the conductor of
the anode to discharge the CRT. Do not allow the conductor to touch your body
or any circuitry.
3. Remove the plugs from J1 and J3 (the CRT wires). Remove the plug from
J2 (the power switch).
4. Remove the two screws from the rear panel that hold the AC line filter in
place.
5. Using a #1 Pozidrive tip, disconnect the power ON/OFF switch from the
Front Panel assembly.
6. Remove the seven screws that are holding the board down. See Figure 4–4.
Power Supply Board
Removal and
Replacement