(c)
Push the switch S2 on the M238 to the INDICATE position. 1) Make sure that the DC BUS PWR ON - NO. 1 light stays off.
(d)
Open these circuit breakers and attach the DO-NOT-CLOSE tags:
1) P6-4 AIR CONDITIONING AND AIRSTAIR CONTROL AC POWER INDICATION Panel a) C808, TR UNITS NO. 3
(e)
Push the switch S2 on the M238 to the INDICATE position. 1) Make sure that the DC BUS PWR ON - TR 3 light stays off.
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737-300/400/500MAINTENANCE MANUAL
2) Make sure that the DC BUS PWR ON - NO. 2 light stays off. 3) Make sure that the DC BUS PWR ON - BAT light comes on.
S 864-012
(8) Put the airplane back to its usual condition.
(a) Remove the DO-NOT-CLOSE tags and close these circuit breakers:
1) P6-4 AIR CONDITIONING AND AIRSTAIR CONTROL AC POWER INDICATION Panel a) C806, TR UNITS NO. 1 b) C807, TR UNITS NO. 2 c) C808, TR UNITS NO. 3
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737-300/400/500MAINTENANCE MANUAL
MAIN POWER CIRCUIT BREAKERS - REMOVAL/INSTALLATION
__________________________________________________
1. General
_______
A. This procedure has these tasks:
(1)
The first task removes the main power circuit breaker (MPCB), from the P6-11 and P6-12 panels.
(2)
The second task installs the MPCB in the P6-11 and P6-12 panels.
(3)
The third task removes the MPCB from the P6-3 and P6-4 panels.
(4)
The fourth task installs the MPCB in the P6-3 and P6-4 panels.
(5)
The fifth task removes the MPCB from the right forward compartment.
(6)
The sixth task installs the MPCB in the right forward compartment.
B.
The two MPCBs for the APU generator are installed in the lower
compartments of the P6-11 and P6-12 panels.
C.
The two transfer relays are located behind the P6-3 and P6-4 panels.
D.
The two MPCBs for the external power are installed in the right forward compartment, adjacent to the nose wheel well.
E.
The two MPCBs for the engine driven generators are installed in the right forward compartment.
TASK 24-21-41-024-001
2. Remove the MPCB from the P6-11 and P6-12 Panels (Fig. 401)
_______________________________________________
A. Access
(1)
Location Zones 102 Right Control Cabin - Main Power Distribution Panel P6
B.
Prepare for the Removal
S 864-038
(1)
Remove electrical power (AMM 24-22-00/201).
S 034-039
(2)
Disconnect the battery connector from the main battery, located in the electronic equipment area.
S 014-005
(3)
Loosen the two screws on the front of the P6-11, and the P6-12 panels and open the panels.
C.
Procedure
S 024-015
WARNING: MAKE SURE ALL THE POWER IS OFF BEFORE YOU TOUCH A CONDUCTOR IN
_______ THE CONTROL COMPARTMENTS. ELECTRICAL SHOCKS CAN CAUSE INJURY TO PERSONS.
(1) Remove the MPCB:
(a) Remove the two screws which attach the MPCB cover plate.
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A 737-300/400/500MAINTENANCE MANUAL
MAIN POWER P6-3 P6-4 SEE
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