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