TM 9-2350-256-20-1
0072 00
Troubleshooting Procedure
Passive Night Viewer
Symptom
Passive night viewer malfunctioning.
Malfunction
Passive night viewer lamp fails to light but passive night viewer operates. Do step 1.
Passive night viewer fails to operate.
Do steps 3 thru 6.
Both lamp and passive night viewer fail to operate. Do steps 5 and 6.
CORRECTIVE ACTION
WARNING
Remove all jewelry such as rings, dog tags, bracelets, etc. If jewelry contacts a metal surface a direct
short may result in instant heating of tools, damage to equipment, and injury or death to personnel.
1.
Remove night viewer indicator lamp from socket. Place red lead of multimeter in socket and black lead
to ground. Turn MASTER switch on and check for voltage. Turn MASTER switch OFF. If voltage is
present, replace lamp (see WP 0164 00). If voltage is not present, go to step 2.
2.
Disconnect wire 516 from night viewer indicator lamp. Place red lead of multimeter in wire 516 and
check for voltage. If voltage is present replace lamp socket (see WP 0178 00). If voltage is not present,
repair/replace wire 999 of switch panel to gage panel and miscellaneous switches wiring harness (see
WP 0204 00).
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