TM
5-5420-226-20-1
DETAILED
TROUBLESHOOTING
PROCEDURE
Symptom-71
SUPPORT
SYSTEM
- PERISCOPES
BOTH
IR PERISCOPES
WILL
NOT
WORK
(INDICATOR
LAMP
WILL
LIGHT).
(
This procedure
is to be performed
by
two
persons.
The
lead
person
is
referred
to as the first technician
and
shall direct the activity
of the second
person
called the second
technician.
)Check
master
control
panel accessories
harness
connector
(CKT 516) for electrical
power.
Second
Technician
(Operator’s
Station )
l
l
l
l
l
l
l
l
l
Set NIGHT
VISION
switch
OFF.
Set MASTER
BATTERY
switch
OFF.
Displace
master
control
panel (page
10-33).
Disconnect
basket-control
panel
accessories
harness
connector
(CKT
516) from
master
control
panel.
Set multimeter
to measure
18 to 30 volts dc, or use STE/
ICE
Test
No.
89 (page
4-81).
Connect
red probe of meter
to contact
A (CKT
5 16) of
master
control
panel
connector
and black
probe
to
ground.
Set MASTER
BATTERY
switch
ON.
Set NIGHT
VISION
switch
ON.
Check
if meter
indicates
18 to 30 volts dc,
aol
*
MASTER
CONTROL
PANEL
(REAR VIEW)
Does meter
indicate
18 to 30 volts dc?
I
Replace
master
control
panel
accessories
harness
(page
10-91).
v
—
TA107367
4-678
