ARMY TM 5-6675-238-14
MARINE CORPS TM 08839A-14/1
Table 8-6. PADS Test Set Self- Test Procedure - Continued
Malfunction indication
Test procedure
Normal indication
corrective action
w. Set tape reader SPOOLING
switch to ENABLE
x. Press SELF TEST switch-indi-
cator to on
NOTE
If FAILURE/ACTION indicator
displays 33 immediately after the
switch is pressed, press SELF-
TEST switch-indicator again
y.
z.
switch to ON
Press each TTY key in turn
SELF-TEST
switch-indicator
lights. Self-test tape runs for-
ward and then stops. PADS ON
switch-indicator lights. PADS
OFF switch-indicator goes off
FAILUR/ACTION indicator dis-
plays 46 when tape stops. EXE-
CUTE switch-indicator goes off.
Ignore flashing lights
SELF-TEST indicator does not light:
Recheck steps h and i because the self-
test cannot proceed unless the se-
quence of steps h and i were com-
pleted correctly
FAILURE/ACTION indicator does not
display 46: Check number displayed
for its definition in table 8-7 and per-
form action specified
EXECUTE switch-indicator does not go
off: Replace the buffer unit, then A1,
and then A3
After each key is pressed, its char-
TTY chatters and does not print out or
acter is printed correctly on
prints out incorrectly
TTY
a. Check cable W212 terminal board
connections
b. Perform the receive circuit bias cur-
rent adjustment. Set up meter to read
current. Remove jumper from E1 and
E2 of the TEST BIAS MA binding
posts located on the left side of the
TTY. Put negative (-) lead of meter
on El and positive (+) lead on E2.
Adjust bias potentiometer on left side
of TTY for maximum current not to
exceed 20 mA
c. If receive circuit bias current cannot
be adjusted as outlined above, per-
form the following SPU short circuit
current test. Set meter up to read
current. Remove cable W212 P1
from the front of the SPU. Put posi-
tive (+) lead of meter on pin 3 of J12
(TTY connector on front of SPU) and
negative (-) lead on pin 4 of J12. The
meter should indicate 30 mA ±10
mA. If meter does not indicate 30
mA, replace A1. If meter does indi-
cate 30 mA, replace or repair TTY
TTY does not print out or prints out
incorrectly:
8-52
