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 - Continued
Malfunction
Test procedure
Normal indication
indication/corrective action
x.
y.
z.
Press SPU ON switch-indicator to Same as step b
on
Set tape reader
switch to SPL
Press SELF TEST
tor to on
N O TE
EXECUTE switch-indicator lights.
IMU FAIL/COMP FAIL indica-
tor lights. OFF or ON portion of
PADS ON/OFF switch-indicator
lights
SPL/LOOP
switch-indica- SELF TEST switch-indicator lights.
Self-test tape runs forward and
then stops. PADS ON switch-indi-
cator lights. PADS OFF switch-
indicator goes off
FAILURE/ACTION indicator dis-
plays 46 when tape stops. EXE-
CUTE switch-indicator goes off.
If FAILURE/ACTION indicator dis-
Ignore flashing lights
plays 33 immediately after the
switch is pressed, press SELF TEST
switch-indicator off and back on
again
aa.
ab.
Turn TTY keyboard MOTOR
switch to ON
Press each TTY key in turn
After each key is pressed, its charac-
ter is printed correctly on TTY
Same as step b
EXECUTE switch-indicator does not
light: Replace buffer unit, then
A1, and then A3
SELF TEST indicator does not light:
Recheck steps i and j because-the
self-test cannot proceed unless the
sequence of steps i and j were
completed correctly
FAILURE/ACTION indicator does
not display 46: Check number dis-
played for its definition in table
8-7 and perform action specified
EXECUTE switch-indicator does not
go off: Replace the buffer unit,
then Al, and then A3
TTY chatters and does not print out
.
a.
b.
or prints out incorrectly:
Check cable W212 terminal
board connections
Perform the receive circuit bias
current adjustment. Set up meter
to read current. Remove jumper
from El and E2 of the TEST
BIAS MA binding posts located
on the left side of the TTY. Put
negative (-) lead of meter on E1
and positive ( + ) lead on E2. Ad-
just bias potentiometer on left
side of TTY for maximum current
not to exceed 20mA
Change 1
8-54.9
