TM
5-5420-226-20-1
DETAILED
TROUBLESHOOTING
PROCEDURE
SUPPORT
SYSTEM
- PERISCOPES
Symptom-70
IR PERISCOPES
WILL
NOT
WORK
(NIGHT
VISION
INDICATOR
LAMP
WILL
NOT
LIGHT)
Check
NIGHT
VISION
switch
in master
control
panel
for continuity.
Technician (Operators Station)
l Set MASTER
BATTERY
switch
OFF,
l Set NIGHT
VISION
switch
OFF.
l Displace
master
control
panel (page
10-33).
l Disconnect
master
control
panel
accessories
harness
leads (CKT
5 16) from
NIGHT
VISION
switch.
l Set multi meter to OHMS Xl scale and zero meter, or
use STE/ICE
Test
No. 91 (page
4-83).
l Set NIGHT
VISION
switch
ON.
l Connect
red probe of meter
to one contact
of NIGHT
VISION
switch.
l Connect
black
probe
of meter
to the other
contact
of
NIGHT
VISION
switch.
l Check if meter indicates
continuity,
Does meter
indicate
continuity?
m
o-m
I-I+
o
./
MASTER CONTROL
PANEL
NIGHT t4S10N~
(REAR VIEW)
SWITCH
~
Replace
NIGHT VISION
switch
(page 10-50).
TA107363
4-674