(d)
Close 6E30, WINDOW HEAT 2R&3L PWR circuit breaker on the P6, Main Power Distribution Panel. 1) Make sure that the EICAS status message WINDOW HEAT 2R
shows.
(e)
Open 6E30, WINDOW HEAT 2R&3L PWR circuit breaker on the P6, Main Power Distribution Panel.
(f)
Remove the jumper from pins B1 and B2 of DR7569.
S 715-039
(2) Do a test of the No. 3L window heat circuit:
(a)
Put C/26/006/00 into the CMCS INPUT MONITORING screen and make sure that bit 14 is a 1.
(b)
Install a jumper between pins A1 and A2 of DR7569.
1) Put C/26/006/00 into the CMCS INPUT MONITORING screen and make sure that bit 14 is a 0.
(c)
Close 6E30, WINDOW HEAT 2R&3L PWR circuit breaker on the P6, Main Power Distribution Panel. 1) Put C/26/006/00 into the CMCS INPUT MONITORING screen and
make sure that bit 14 is a 1.
(d)
Open 6E30, WINDOW HEAT 2R&3L PWR circuit breaker on the P6, Main Power Distribution Panel.
(e)
Remove the jumper from pins A1 and A2 of DR7569.
(f)
Install the relay R7569 in the P414, Left Power Distribution Center.
S 715-040
(3) Do a test of the 2R&3L power off relay:
(a) Close 6E30, WINDOW HEAT 2R&3L PWR and 6E31, WINDOW HEAT 2R&3L IND circuit breakers on the P6, Main Power Distribution Panel. 1) Make sure that the EICAS status message WINDOW HEAT 2R does
not show. 2) Put C/26/006/00 into the CMCS INPUT MONITORING screen and make sure that bit 14 is a 0.
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747-400 MAINTENANCE MANUAL
(b)
Open 6E30, WINDOW HEAT 2R&3L PWR circuit breaker on the P6, Main Power Distribution Panel. 1) Make sure that the EICAS status message WINDOW HEAT 2R
shows. 2) Put C/26/006/00 into the CMCS INPUT MONITORING screen and make sure that bit 14 is a 1.
(c)
Close 6E30, WINDOW HEAT 2R&3L PWR circuit breaker on the P6, Main Power Distribution Panel. 1) Make sure that the EICAS status message WINDOW HEAT 2R does
not show. 2) Put C/26/006/00 into the CMCS INPUT MONITORING screen and make sure that bit 14 is a 0.
(d)
Open 6E31, WINDOW HEAT 2R&3L IND circuit breaker on the P6, Main Power Distribution Panel. 1) Make sure that the EICAS status message WINDOW HEAT 2R
shows.
NOTE: A delay of about 60 seconds can occur before the
____
message shows.
2) Put C/26/006/00 into the CMCS INPUT MONITORING screen and make sure that bit 14 is a 1.
(e) Close 6E31, WINDOW HEAT 2R&3L IND circuit breaker on the P6, Main Power Distribution Panel. 1) Make sure that the EICAS status message WINDOW HEAT 2R does
not show. 2) Put C/26/006/00 into the CMCS INPUT MONITORING screen and make sure that bit 14 is a 0.
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(4)
Erase any EICAS status messages which showed during the test (AMM 31-61-00/201).
(5)
Remove electrical power (AMM 24-22-00/201).
S 865-042
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747-400 MAINTENANCE MANUAL
WINDOW HEAT CONTROL UNIT - REMOVAL/INSTALLATION
_______________________________________________
1. General_______
A. There are two tasks in this subject. There is one task for removal and there is one task for installation of the window heat control unit. The left window heat control unit is located on the E1-3 shelf The right window heat control unit is located on the E2-4 shelf. The procedure has these parts:
-Look for stored shop faults with the CMCS (this is optional)
-
Remove power from the window heat control unit
-
Remove the window heat control unit
-Install the replacement window heat control unit
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