GE PANDA Service Manual page 85

Possible Causes
AC Short in wiring to
12V DC Power
Supply
AC Short in 12V DC
Power Supply
No DC Power Supply
Disconnected/faulty
harness
Faulty Procedure
Light Harness
Service Manual
Step Troubleshooting Procedure
Re-Test for shorts by back-probing J28 on the
16. Power PCA from chassis to pin 1, chassis to pin 4,
and pin 1 to pin 4.
If short, remove upper housing and continue.
17.
If open, go to Step 23.
Disconnect AC input connector (J1) on (East side)
12V DC Power Supply. Test the mating connector
18.
from chassis to pin 1, chassis to pin 3, and pin
1 to pin 3.
If short, disconnect in-line connectors to the
19. PF choke. If short went away, then proceed to
Step 21.
If still short, replace PF Choke. If short went away,
20.
replace harness.
21. If open, test power supply.
Reconnect all harnesses and turn Stand-by
22.
switch ON.
Using AC Volt Meter, check for mains voltage at
23.
power supply input connector pins 1-3.
If AC voltage not present, turn OFF and check for
open in harness.
24.
(Refer to "6.13 Wiring
continue.
Turn ON Standby switch and using a DC Volt Meter,
25. backprobe J2 pins 2, 5 on 12V DC Power Supply
and check for 12V DC.
If DC voltage not present, replace 12V DC Power
26.
Supply If DC voltage OK, continue.
Turn OFF and disconnect J33 on Alarm/Light PCA
27.
and DC output connector on 12V DC Power Supply.
With a good bulb installed, check for continuity
through the bulb, pin 1 of 12V DC Power Supply
28.
connector to J33 pin 1 at Alarm/Light PCA
connector.
If Digital Multimeter test fails, replace Procedure
29. Light Assembly.
If OK, continue.
Using Ohm Meter, check J33 pins 3, 4 on
Procedure Light Assembly harness. Procedure
30.
light Switch On = Short (about .5 Ohm); Switch
Off = Open.
Reconnect and turn ON. If Ohm Meter test fails,
31.
replace Procedure Light Assembly. If OK, continue.
Diagrams".) If AC voltage OK,
Chapter 4: Troubleshooting
Troubleshooting Tables
Comments
3 mm Hex T-
Wrench
Mating connector
harness part #:
6600-1558-700
4-23