TM 10-4610-232-12
Table 4-2. Unit Troubleshooting Guide (Continued)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
ALARM CIRCUITS.
1. Alarm test does not work (Reference Schematic Diagram FO-1, Sheet 11, schematic lines 1002 and 1013).
Step 1.
Remove connector P52 from the alarm box. Check for voltage across pins P52A and P52J and also across P52N
and P52J (Reference Interconnection Diagram FO-2, Sheet 15) when the ALARM TEST button is pushed.
(a) If no voltage is present, go to step 4.
(b) If there is voltage across P52AJ, go to step 2.
(c) If there is voltage across P52NJ, go to step 3.
(d) If there is voltage across both sets, do both steps 2 and 3.
Step 2.
Shutdown the ROWPU. Shut down the generator. Refer to the electrical schematic Appx. -1 and check continuity,
point-to-point, from J52A to J52J (Reference Interconnection Diagram FO-2, Sheet 15).
(a) Repair any loose or damaged wire (para. 4-31).
(b) Replace connector assembly J52, if faulty (para. 4-31).
(c) Replace alert horn HN1 if all wires and the connector are good (para. 4-31).
Step 3.
Shutdown the ROWPU. Shutdown the generator. Refer to the electrical schematic Appx. 1- and check continuity,
point-to-point, from J52N to J52J .
(a) Repair any loose or damaged wire (para. 4-31).
(b) Replace connector assembly J52, if faulty (para. 4-31).
(c) Replace warning horn HN2 (Reference Interconnection Diagram FO-2, Sheet 15) if all wires and the
connector are good (para. 4-31).
Step 4.
Remove connector P12 from the control panel. Check voltage across pins J12A and J12J, also check across J12F
and J12J (Reference Interconnection Diagram FO-2, Sheet 9) when the alarm test is pushed.
4-42 Change 12
