TM
5-5420-226-20-1
DETAILED
TROUBLESHOOTING
PROCEDURE
Symptom-46
INDICATOR
- LAMP
NIGHT
VISION
INDICATOR
LAMP
WILL
NOT
LIGHT
(IR
PERISCOPES
WILL
WORK)
I
Check
master
control
panel accessories
harness
(CKT 516) for continuity
from NIGHT VISION switch to
indicator
lamp.
Technician (Operator’s Station)
l Set MASTER
BATTERY
switch
OFF
l Set NIGHT
VISION
switch
OFF.
l Displace
master
control
panel
(page
10-33).
l Disconnect
connectors
(CKT
516) from indicator
lamp
and
NIGHT
VISION
switch.
l Set meter to OHMS X 1 scale and “zero” meter, or use
STE/lCE
Test
No. 91 (page 4-83).
l Place red probe of meter to indicator
light cable
connector
and black probe to NIGHT
VISION
switch
cable connector.
l Check if meter indicates
continuity.
Does meter
indicate
continuity?
n
--
11
,
I
I
Replace
master
control
panel
(
accessories
harness
(page
10-91).
(CKT 516)
/
(CKT 516)
/
MASTER
CONTROL
NIGHT
VISION
PANEL
INDICATOR
LAMP
(REAR
VIEW)
r Replace
NIGHT VISION
indicator
lamp socket
(page 10-50).
TA1072O5
4-516
