ACCESS PROCEDURES
Removing the A12 Sum Loop PCA 5-15.
WARNING
THE SYNTHESIZER MODULE, WHICH MUST BE RAISED TO GAIN
ACCESS TO THE A12 SUM LOOP PCA, IS HEAVY. WHEN RAISING OR
LOWERING THE MODULE, OBSERVE THE PROCEDURE DESCRIBED
UNDER THE HEADING "INTRODUCTION AND SAFETY" EARLIER IN
SECTION 5.
1. Disconnect RF cables W13 and W14 from the connectors at the front edge of the
output module, and remove the nuts and lockwashers from the connectors.
2. Raise the synthesizer module.
3. Remove the #6 screws holding the top output module cover, and remove the cover.
(The #10 screws are adjustment-access screws and need not be removed).
4. Disconnect the FM-Sum Loop ribbon cable W32 from the A12 Sum Loop PCA.
5. Remove the plug-in capacitor C2 between the A12 Sum Loop PCA and the A14
FM
PCA.
6. Remove the #6 screws holding the Sum Loop lid, and remove the lid.
7. Remove the #6 screws holding the PCA.
8. Carefully remove the A12 Sum Loop PCA.
Removing the A13 Controller PCA 5-16.
WARNING
THE SYNTHESIZER MODULE, WHICH MUST BE RAISED TO GAIN
ACCESS TO THE A13 CONTROLLER PCA, IS HEAVY. WHEN RAISING OR
LOWERING THE MODULE, OBSERVE THE PROCEDURE DESCRIBED
UNDER THE HEADING "INTRODUCTION AND SAFETY" EARLIER IN
SECTION 5.
1. Raise the synthesizer module.
2. Remove the #6 screws holding the top output module cover, and remove the cover.
(The #10 screws are adjustment-access screws and need not be removed).
3. Disconnect the front panel display ribbon cables W18 and W36 from the A13
Controller PCA.
4. Disconnect the IEEE ribbon cable W17 from the A13 Controller PCA.
5. Disconnect the Controller-Synthesizer ribbon cable W16 from the A13 Controller
PCA.
6. Disconnect the power supply cable W22 from the A13 Controller PCA.
7. Disconnect the relay driver ribbon cable W19 from the A13 Controller PCA.
8. Remove the #6 screws holding the PCA.
9. Carefully remove the A13 Controller PCA.
5-7
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