Troubleshooting
PROBLEM / CONDITION
CAUSE
SOLUTION
GPU does not turn ON
Volt/Amp meter OFF*
Status indicator OFF
No AC input to GPU.
Verify power cord connections.
Check AC input fuse. If blown, replace
(only once). 1 extra fuse is contained in
the fuse drawer. If fuse blows a second
time, do not replace until GPU is
repaired. See Limited Warranty
statement for technical service contact
information.
GPU displays voltage but no output
to aircraft (zero amps)
Status indicator
GREEN
Faulty connection between
GPU and aircraft electrical
system.
Check connections from GPU to the
aircraft’s external power receptacle.
Volt/amp meter OFF*
Status indicator
FLASHING GREEN
Auto-shutdown timer
expired.
Cycle power switch OFF, then back ON,
to restart shutdown timer.
Adjust timer settings if desired, or zero to
disable shutdown timer.
Status indicator
FLASHING RED
Voltage drops to < 13 volts
Current overload.
Reduce load to less than 35 amps.
Status indicator
FLASHING RED
Volt/Amp meter OFF
Internal protection engaged.
Over temperature, or
Sustained overload.
Reduce load to less than 35 amps.
Turn off aircraft equipment to reduce
current draw.
Cycle Power Switch OFF then ON again
to reset.
Status indicator
FLASHING RED
GPU displays voltage but no output
to aircraft (zero amps)
Internal protection engaged.
If cable connections are good, then turn
power switch OFF.
Disconnect DC output cord from aircraft
external power receptacle. Wait for GPU
meter to go OFF.
Power switch ON. Meter ON.
Reconnect to aircraft.
* If there is battery voltage backfeeding to the GPU from the aircraft, the voltmeter will display that condition, which may trigger the
GPU into protection mode and not turn back on if power is interrupted. Follow instructions above for disconnecting from the
aircraft and resetting the GPU to restore proper operation.
Specifications:
Input:
90-240 Volts AC, 50-60 Hz, 5.3A @ 115VAC
Input Fuse:
Littelfuse 617 Series, 8A. P/N 0617008.MXP
Output:
14.25 +/- 0.25 Volts DC, 35 amps
Output cable:
8A dual conductor, SB-50 plug each end, yellow (12/14V)
Dimensions:
4.13”H x 5.32”W x 13.4”L (chassis, not including cables)
Carton dimensions: 6”H x 10”W x 16”L
Unit weight:
9.5 lbs., cables included
Shipping weight:
11 lbs
6
Model M1435-EXP Manual P/N 752-790, Rev 20211029
