ARMY TM 5-6675-238-14
MARINE CORPS TM 08839A-14/1
Table 8-8. Tape Reader Testing and Troubleshooting Procedure - Continued
Malfunction indication/
Test procedure
Normal indication
corrective action
4.1b. Connect DVM negative test
Voltage out of tolerance: Perform tests
4.lc.
4.1d.
4. le.
lead to ground (TB2 termi-
nal 10; TP5) and positive
test lead to A2 card cage pin
W (card extender may be
helpful)
Connect DVM negative test
lead to ground (TB2 termi-
nal 10; TP5) and positive
test lead to A2 card cage pin
z
Press
SPU
REVERSE
switch-indicator to off
Press SPU MEMORY LOAD
switch-indicator to on
4.1f. Connect DVM negative test
lead to ground (TB2 terminal
10; TP5) and positive test
lead to A2 card cage pin W
4.2 PULSE RATE GENERATOR.
4.2a.
4.2b.
4.2c.
4.2d.
4.2e.
Reinstall A2 on card ex-
tender
Connect DVM negative test
lead to ground (TB2 termin-
al 10; TP5) and positive
test lead to A2 card pin Y
Press SPU MEMORY LOAD
switch-indicator to off
Press
SPU
REVERSE
switch-indicator to on
Insert card extender in A5
card cage position and rein-
stall A2 into card cage posi-
tion
DVM indicates +3.0 to + 5.5V.
(Check that REVERSE switch-
indicator is pressed to on by cy-
cling the switch)
DVM indicates +3.0 to + 5.5V.
(Check that REVERSE switch-
indicator is pressed to on by cy-
cling the switch)
REVERSE switch-indicator goes
off and DVM indicates -0.3 to
+ 0.5V
MEMORY LOAD switch-indicator
goes on and DVM indicates
+3.0 to + 5.5V
DVM indicates -0.3 to + 0.5V
DVM indicates +3.0 to +5.5V
MEMORY LOAD switch-indicator
light goes off
REVERSE switch-indicator lights
and DVM indicates -0.3 to
+ 0.5V
in table 8-6; if still fails, replace SPU
board A1
Same as step 4.1.b
Same as step 4.1.b
Same as step 4.1.b
Same as step 4.1.b
Voltage out of tolerance: Replace A2
Refer to table 8-6
Voltage out of tolerance: Replace A2.
REVERSE switch-indicator does not
light: Refer to table 8-6
4.2f. Connect 10:1 probe to chan-
nel A input of the oscillo-
scope
8-70
