B. Procedure
S 864-002
(1) Open these circuit breakers on the overhead circuit breaker panel, P11, and attach DO-NOT-CLOSE tags:
(a)
11C3, VHF COMM LEFT
(b)
11G4, VHF COMM CENTER (IF INSTALLED)
(c)
11G31, VHF COMM RIGHT
S 024-037
CAUTION: CLEARLY IDENTIFY THE CONNECTOR FOR THE PANEL POSITION
_______ (LEFT, RIGHT OR CENTER) DURING REPLACEMENT. THERE IS A CROSS-CONNECTION POSSIBILITY DURING INSTALLATION.
(2) Remove the VHF communication control panel.
(a)
Loosen the four quarter-turn fasteners.
(b)
Lift the VHF communication control panel to get access to the electrical connector.
(c)
Disconnect the electrical connector.
(d)
Put protective covers on the electrical connector.
TASK 23-12-02-404-038
3. VHF Communication Control Panel - Installation
______________________________________________
A. References
(1) AMM 24-22-00/201, Electrical Power - Manual Control
B. Access
(1) Location Zones
211/212 Flight Compartment
C. Procedure
S 864-039
(1) Make sure these circuit breakers are open on the overhead circuit breaker panel, P11:
(a) 11C3, VHF COMM LEFT
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757 MAINTENANCE MANUAL
(b)
11G4, VHF COMM CENTER (IF INSTALLED)
(c)
11G31, VHF COMM RIGHT
S 424-040
CAUTION: CLEARLY IDENTIFY THE CONNECTOR FOR THE PANEL POSITION
_______ (LEFT, RIGHT OR CENTER) DURING REPLACEMENT. THERE IS A CROSS-CONNECTION POSSIBILITY DURING INSTALLATION.
(2) Install the VHF communication control panel.
(a)
Remove the protective covers from the electrical connector.
(b)
Examine the electrical connector for bent or broken pins, dirt, and damage.
(c)
Connect the electrical connector.
(d)
Put the VHF comm control panel in its position on the P8 panel.
(e)
Tighten the four quarter-turn fasteners.
S 864-006
(3) Remove the DO-NOT-CLOSE tag and close the circuit breaker on the P11 panel for the VHF communication control panel that you installed:
(a)
11C3, VHF COMM LEFT
(b)
11G4, VHF COMM CENTER (IF INSTALLED)
(c)
11G31, VHF COMM RIGHT
S 864-041
(4) Make sure that the two circuit breakers for the other panels are open.
NOTE: You will close one circuit breaker at a time to do a check
____
for a cross-connection.
D. VHF Communication Control Panel Installation Test
S 864-008
(1)
Supply electrical power (AMM 24-22-00/201).
S 864-009
(2)
Set the STBY PWR switch, on the pilots' overhead panel, P5, to the AUTO position.
S 714-043
(3)
Use the new VHF communication control panel to set the applicable VHF communication system to a test frequency.
(4)
Make sure the VHF communication system operates satisfactorily.
S 864-045
(5)
Remove the DO-NOT-CLOSE tag and close the circuit breaker on the P11 panel for one of the other VHF communication control panels:
S 714-044
(a) 11C3, VHF COMM LEFT
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