ARMY TM 5-6675-238-14
MARINE CORPS TM 08839A-14/1
Table 8-6.1. PADS Test Set Self-Test Procedure Using Tape Reader, Part No. 877406-2
Malfunction
Test procedure
Normal indication
indication/corrective action
a. Check that cable W201 is con-
nected as shown in figure 8-2
b. Press SPU ON switch-indicator to
on
c. Turn off any lighted switch-indi-
cator other than SPU ON or
PADS ON/OFF, by pressing
them
SPU ON switch-indicator
OFF or ON portion of
ON/OFF switch-indicator
Blower is operating.
115 VAC can be lethal. Use extreme
care when measuring.
lights.
No normal indications:
PADS
lights. a“
TIME
HOURS meter is operating by ob- b
servation of comma oscillation
c.
d.
e.
f.
Check + 28V fuse and replace if
defective
Verify the 155-VAC primary
power is properly connected and
present between W 1 and W2
Check if 115 VAC is present at
terminals 1 and 2 of PSI
If 115 VAC is not present, check
R2, DS3 and input power wiring
and repair as necessary
If 115 VAC is present check for
+ 28V between terminals 4(+)
and 5(-) of PS1
If + 28V is present between ter-
minals 4 and 5 of PS1, check wir-
ing between terminals 4 and 5 of
PS1 and W3 and W4
g. If + 28V is not present between
terminals 4 and 5 of PS1, discon-
nect Z1 from PS1
h. Recheck + 28V between termi-
nals 4 and 5 of PS1
i. If + 28V is present between ter-
minals 4 and 5 of PS1, adjust Z1
according to procedure 8-23e
j. If Z1 cannot be adjusted, replace
Z1
k. If + 28V is not present at termi-
nals 4 and 5 of PS1, replace PS1
Any switch-indicator that is lighted No lighted switch-indicator goes off
will go off when pressed
when pressed:
a. Check + 5V fuse; replace if nec-
essary
b. Check PS2 output voltage be-
tween W5(+) and W6(-) for
+ 5V
8-54.2
Change 1
