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Racal Instruments RA6790/GM Instruction Manual page 163

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4. Disconnect ribbon connector W13P2 from A9J6.
5. Disconnect ribbon connector W15P2 from A9J5.
6. Disconnect ribbon connector W19P1 from A9J4.
7
r
Disconnect ribbon connector W14P2 from A9J7.
8. Disengage the two friction locks on connector W20Pl and. unplug the connector from
A10J2 on
~e AIO module.
.
9. Stand the Receiver vertically'on its rear panel. Loosen and remove the four (4)
~crews
and hardware on the outside of the front panel which hold the front panel to the
receiver frame.
10. Using the handles on the front panel, lift the front panel (A9 module) off the Re-
ceiver being careful not to snag connector W20Pl or its cable on the Bandwidth Filter
cover. Snagging W20Pl may result in damage to the connector, the cable, or the
POWER ON/OFF switch. If further disassembly is required, proceed to step 11.
11. Loosen and remove the single screw and hardware which holds down the tuning shaft
encoding wheel.
12. Carefully remove the encoding wheel.
CAUTION
Do not pry on the encoding wheel, as the hidden side of the
encoding wheel is part of the manual tuning encoder. Damage
to the encoding wheel may impair manual tuning.
13. Rest the front panel on the front panel handles.
14. Remove flrst the lockwasher and then the flatwasher that flt between the encoding
wheel and the tuning shaft.
15. Using flngers, loosen and remove the tuning shaft assembly retaining nut, lockwasher,
flat washer,
an~
nylon washer (insulator).
16. Loosen and remove the ten (10) screws and hardware which hold the A9 module to
mounting posts on the front panel.
17. While gently lifting the A9 module, carefully work the keypad ribbon leads out of
connectors A9J2 and A9J3.
NOTE
Connectors A9J2 and A9J3 are soldered to the A9 module.
The keypad ribbon leads have no connectors fastened to them.
To separate the ribbon leads from the connectors, use fingers
to carefully pull the ribbon leads straight out.
18. Carefully fold the A9 module down away from the ribbon leads to expose the wires
leading to the front panel controls.
5-25

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