TM 5-1260-206-34
Table 5-2.
DIC Troubleshooting Procedures
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1.
SONALERT DOES NOT SOUND WHEN PUSHBUTTONS OR FOOTSWITCH ARE PRESSED
Step 1.
Set up system to perform IDP 03 diagnostic. (See table 2-3,
steps 1 through 5.) Press each pushbutton switch and foot-
switch in turn. Check when sonalert does not sound.
If sonalert does not sound for all switches, do step 2.
If sonalert does not sound for only one switch, do step 4.
Step 2.
Remove top assembly. Connect oscilloscope to + terminal of
sonalert. Check that positive TTL pulse is present when
any pushbutton is pressed.
If present, r e p l a c e faulty sonalert. (See table 5-6.)
If not present, check for continuity between sonalert
and plug P1.
Step 3.
Check that malfunction is corrected.
If not, refer faulty DIC to depot maintenance personnel.
Step 4.
Connect oscilloscope to pin 2 of pushbutton switch in ques-
tion or P1, pin 7 for footswitch. (See figure 5-1.)
Check for:
Negative TTL pulse for pushbutton switches.
Positive TTL pulse for footswitch.
If present, do step 5.
If not present, replace faulty switch or resistor.
(See table 5-4.)
Connect oscilloscope to:
Step 5.
P1, pin 1 for
pin 2 for
pin 8 for
pin 10 for
pin 11 for
5-3
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