ARMY TM 5-6675-238-14
MARINE CORPS TM 08839A-14/1
Table 8-8.1. Tape Reader Testing and Troubleshooting Procedure for Tape Reader Part No. 877406-2
Malfunction indication/
Test procedure
Normal indication
Corrective Action
a. Ensure that spools and tape are
removed from tape reader
b. Set switch S1 to self-test mode as
shown in figure 8-5.1. Switch is
accessible through back of tape
reader chassis
c. Press SPU ON switch-indicator to
o n
d. Observe tape reader TIME
HOURS meter
e. Observe tape reader LED display
indicators
TIME HOURS meter is operated by If meter is not operating, check
observation of comma oscillation
+28V fuse. If fuse is good, or
keeps blowing out when replaced,
check the meter wiring
If the wiring is good, replace meter
Indicators 1, 2, 3 and 10 light con-
If no indicators light, check 115
tinuously
VAC fuse. If fuse keeps blowing
out when replaced, check for
shorts (see figure FO-20)
If fuse is good, check line filter
If line filter is good, check trans-
former
If transformer is good, replace
power supply
If indicator 10 and indicator 1 or 2
flash, replace read head module
If indicators 10 and 3 flash, replace
interface module, then main logic
module
f. Press SPU ON switch-indicator to
off
g. Set tape reader switch S1 to par-
allel mode as shown in figure
8-5.1
h. Set SPL/LOOP switch to SPL
Ensure that read head cover is
closed
Press SPU ON switch-indicator to Left motor rotates counterclockwise
on
approximately 1 revolution per
second
Right motor rotates clockwise ap-
proximately 1 revolution per sec-
ond
Momentarily hold tape reader Right motor increases in speed
R/L switch in R position
Left motor does not rotate counter-
clockwise approximately 1 RPM.
Adjust servo module resistor RV2.
(See figure 8-5.2 for location of
resistors.)
Right motor does not rotate clock-
wise approximately 1 RPM. Adjust
servo module resistor RV1
If right motor does not increase in
.
clockwise then stops
speed, replace servo module, then
right motor
Change 1
8-80.1
