TM5-1260-206-34
Table 2-7.
APPS Troubleshooting Procedures
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
SONALERT SOUNDS REPEATEDLY
1.
Remove DAC top and bottom cover plates. Using an oscillo-
Step 1.
scope, check that a 3 kHz, 18 to 20 volt peak-to-peak signal
is present at TP3 of card A.
If good, do step 2.
If bad, do step 4.
Set up system to perform IDP 03 diagnostic. (See table 2-3,
Step 2.
steps 1 thru 5.) Using an oscilloscope, perform the
following measurements:
Check that malfunction is
Replace Calculator cable W102.
Step 3.
corrected.
If not, refer to TM 11-6660-263-24-2 for
Calculator troubleshooting procedures.
Using an oscilloscope, perform the following measurements:
Step 4.
If bad
If good
Pin No.
Observe
refer to
do step
3kHz
A68
5.
15V p-p
malfunc-
tion 5.
3kHz
A72
2V p-p
Check continuity of OMS cables W101 and W105.
Step 5.
If good, refer faulty OMS to depot maintenance personnel.
If bad, replace faulty cable.
2.
DIC SONALERT DOES NOT SOUND WHEN PUSHBUTTONS OR FOOTSWITCH ARE PRESSED
Open DIC unit. Connect Multimeter to PI, pin 4. Disconnect cable
W105 from OMS photo-carriage. Check that +5V is present.
If yes, refer to table 5-2, malfunction 1.
If not, refer to table 3-2, malfunction 6.
2-24
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