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33-12-02
ALL ú ú 01 Page 209 ú Oct 10/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
LIGHTED PUSHBUTTON SWITCHES - MAINTENANCE PRACTICES
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1. General (Fig. 201)
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A. This procedure contains pushbutton switch tasks that:
(1)
Replace the indicator lamps in the lens cap,
(2)
Replace the diode/fuse card of the master module,
(3)
Remove the master module from the switch assembly,
(4)
Install the master module in the switch assembly.
B. The pushbutton switches have two light circuits that are electrically isolated.
(1)
One circuit controls the caution indicator lamps in the switch assembly.
(a)
28 V dc is supplied to these lamps from the Master Dim and Test module.
(b)
The caution indicator lamps can be tested if the IND LTS switch is put in the TEST position.
(2)
The second circuit controls the position indicator lamps in the switch.
(a)
5 V ac is supplied to these lamps from an instrument panel dimmer.
(b)
A check of the position indicator lamps cannot be done unless the switch is operated. 1) Refer to the applicable switch system procedure to operate
the switch.
TASK 33-12-03-962-001
2. Pushbutton Switch Lamp Replacement (Fig. 201)
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A. References
(1) 24-22-00/201, Manual Control
B. Access
(1) Location Zone 200 Pilots Instrument Panels - Flight Compartment
C. Lamp Replacement Procedure
S 862-002
(1)
Supply electrical power (Ref 24-22-00/201).
S 862-003
(2)
Make sure these circuit breakers are closed:
(a) P6 Main Power Distribution Panel 1) 6F19 FLT DK LIGHTS PILOT MISC IND 1 2) 6F20 FLT DK LIGHTS PILOT MISC IND 2 3) 6F26 FLT DK LIGHTS F/O IND 4) 6F27 FLT DK LIGHTS F/O IND DGTL DSPL 5) 6L4 FLT DK LIGHT CAPT IND 6) 6L5 FLT DECK LIGHT CAPT IND DGTL DSPL 7) 6E20 FLT DK LIGHTS PANEL OVHD
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
33-12-03
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
S 212-050
(3) Identify the defective lamps: (a) Put the IND LTS switch on the P5 panel to the TEST position and hold the switch in that position. (b) Identify the indicator lamps that do not come on. (c) Put the IND LTS switch to the BRT position.
S 862-060
(4) Open these circuit breakers and attach DO-NOT-CLOSE tags: (a) P6 Main Power Distribution Panel 1) 6D19 P5 PB SW LTS 2) 6F19 FLT DK LIGHTS PILOT MISC IND 1 3) 6F20 FLT DK LIGHTS PILOT MISC IND 2 4) 6F26 FLT DK LIGHTS F/O IND 5) 6F27 FLT DK LIGHTS F/O IND DGTL DSPL 6) 6L4 FLT DK LIGHT CAPT IND 7) 6L5 FLT DECK LIGHT CAPT IND DGTL DSPL 8) 6E20 FLT DK LIGHTS PANEL OVHD
S 212-048
(5) Identify the system controlled by the switch to receive maintenance.
S 862-009
WARNING: OPEN THE SYSTEM CIRCUIT BREAKERS CONTROLLED BY THE PUSHBUTTON
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