TM
5-5420-226-20-1
DETAILED
TROUBLESHOOTING
PROCEDURE
Symptom-72
SUPPORT
SYSTEM
- PERISCOPES
(Continued)
Check operation
of IR periscope
by substituting
it with
a serviceable
unit.
Second
Technician
(Operators
Station)
l
Obtain
and install
serviceable
IR periscope
(TM
5-5420-226-
10).
First
Technician
(Commanders
Station)
l
Connect
IR periscope
power
cable
(CKT
517) to IR
powerpack.
Second
Technician
(Operators
Station)
l
Connect
IR periscope
power
cable
(CKT
5 17) to IR
periscope.
l
Set MASTER
BATTERY
switch
ON,
l
Set NIGHT
VISION
switch
ON.
l
Operate
IR periscope
(TM5-5420-226-10).
l
Check
for clear image while looking
through
periscope
eyepiece.
Can clear image be seen through
eyepiece?
CKT
T
5
00
.
---\>
a
fk%i!
..
.
)
I_
,
516
Replace
unserviceable
IR
Ie=lpowerpack(page10-152).
NO
I
l
Original
IR periscope
is
unserviceable.
Replace
unserviceable
IR periscope
(page
10-152).
l
Install floor accoaa
cover
(page
17-9).
4-684
TA107373