24-54-00
 ALL  ú ú 01 Page 4 ú Oct 25/84
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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 24-54-00
 ALL  ú ú 06 Page 5 ú Nov 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
28V DC
BAT BUS
28V DC
BUS 1
115V ACTRANS BUS 1
28V DC
BUS 1
28V DCHOT BATBUS
28V DC
BAT BUS
28V DC
BAT BUS
28V DCHOT BATBUS

LIGHT
P6 LOAD CONTROL CENTER RIGHT
Standby Power System Simplified SchematicFigure 2
A
737-300/400/500MAINTENANCE MANUAL
 STANDBY POWER SYSTEM - TROUBLE SHOOTING
_______________________________________
 1.  General
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 A.  Assume that there are no wiring malfunctions nor more than one problem in the system. If there is more than one malfunction or there are open or shorted wires, further isolation is necessary.
 WARNING: EXERCISE EXTREME CAUTION WHEN WORKING AROUND ENERGIZED PANELS.
_______
 HIGH VOLTAGES PRESENT CAN BE FATAL.

 B.  If it is not practical to make the listed checks, replacement of the suspected part(s) may be more efficient for short ground-time maintenance. Refer to wiring diagram 24-34-01 and 24-50-00.
 2.  Prepare for Trouble Shooting
____________________________
 A.  Verify that battery is charged (Ref 24-31-11).
 B.  Provide electrical power (AMM 24-22-00/201).
 3.  Standby Power System Trouble Shooting Charts
____________________________________________
 A. Place BAT switch and GRD PWR switch to ON. ~.............................................................................. | TROUBLE | PROBABLE CAUSE | ISOLATION PROCEDURE | REMEDY | ................................................................................ | No ac standby| | With static inverter| | | power (dc | | removed, check for 28V dc| | | standby OK) | | at pin 2 of D46 and check| | | | | for 28V dc at pin 4 of D46| | | | | | | | | | With static inverter in| | | | | place, check for 115V ac at| | | | | pin 2 of D4614P| | | | | | | | | Static inverter | If turn-on voltage present,| Replace static| | | | but output voltage not | inverter M9| | | | present| | | | | | | | | Relay R328 | If turn-on and output | Replace R328| | | | voltage present| | | | | | | | No ac standby| Relay R37 | Set S4 to AUTO, open STBY | Replace R37| | power (dc | | POWER AUTO CONT circuit| | | standby | | breaker on P6. Press and| | | OK)(Cont) | | hold GRD SENSING TEST| | | | | switch (simulates flight| | | | | conditions). If turn-on| | | | | and output voltage present| | | | | | |
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 24-54-00
 ALL  ú
 ú  01  Page 101
 ú  Mar 12/02 

BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 ~.............................................................................. | TROUBLE | PROBABLE CAUSE | ISOLATION PROCEDURE | REMEDY | ................................................................................ | | Voltage sensor | With S4 at AUTO, close | Replace| | | M562 | STBY POWER AUTO CONT, open | voltage sensor| | | | STBY BUS POWER AC on P6.| | | | | Press and hold GRD SENSING| | | | | TEST switch. If turn-on| | | | | and output voltage present| | | | | | | | No dc standby| Relay R328 | With S4 at BAT, no dc | Replace R328| | power (ac | | standby power| | | standby OK) | | | | | | | | | | | Relay R37 | Set S4 to AUTO, open STBY | Replace R37| | | | POWER AUTO CONT circuit| | | | | breaker on P6. Press and| | | | | hold GRD SENSING TEST| | | | | switch. If no dc standby| | | | | power| | | | | | | | No ac or dc | Relay R328 | Set S4 to BATT. If no | Replace R328| | standby power| | standby power| | | | | | | | | Relay R37 | Set S4 to AUTO, open STBY | Replace R37| | | | POWER AUTO CONT circuit| | | | | breaker on P6. Press and| | | | | hold GRD SENSING TEST| | | | | switch. If no standby| | | | | power| | | | | | | | STANDBY POWER| Light L5 or, | Press to test light L5. If | Replace L5| | OFF light | Relay R330 or, | light does not illuminate.| | | does not | Switch S5| | | | illuminate | | If light illuminates | Replace R330.| | upon loss of | | | If NOT OK -| | standby power| | | Replace S5| | | | | |
　
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