8-68
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
2f. Remove A2 from card ex-
tender and reinstall A2 in card
cage
2g. Install A7 on card extender
and insert card extender into
A7 card cage
2h. Connect DVM negative test
DVM indicates +27 to + 29V
lead to ground (TB2 terminal
10; TP5) and positive test lead
to SPOOLING switch S1
common terminal (TP9). See
figure 8-3, sheet 1 of 2 Switch
top terminal
Voltage out of tolerance: Adjust A7R6
until voltage is in tolerance. If still out
of tolerance, remove A7 and measure
greater than + 46V between A7 card
cage pin D and ground (TP5). If
greater than + 46V, check Q1 (use A7
card cage pins D, C, and S; see. figure
FO-19); if good, replace A7. If less
than + 46V (see note at beginning of
test 1), check R4 for less than 5 ohms
between pins 5 (TP1) and 6 (TP2) on
T1. (See figure 8-3, sheet 2); if good
replace CR1 and CR2
2i. Remove A7 from card extender
and reinstall in A7 card cage
3. SERVO CIRCUITS.
3.1 SENSE ARMS and REEL
DRIVERS
3.1a. Remove A6 from card cage
and install card extender in
A6 position
3.1b. Measure resistance between Multimeter indicates 20 to 200 Resistance out of tolerance: Replace
A6 card extender pins L and
ohms
FL1 and B2
M
3.1c. Measure resistance between Multimeter indicates 0.2 to 200 Resistance out of tolerance: Replace
pins A and E of A6 card
ohms
FL2 and B3
extender
3.1d. Install A6 card into card ex-
tender
3.1e. Connect DVM negative test
lead to ground (TB2 termi-
nal 10; TP5) and positive
test lead to A6 card pin R
