TM-9-2320-283-20-1
TRUCK TRACTOR, LINE HAUL, 50,000 GVWR, 6X4, M915A1
TECHNICAL MANUAL; ORGANIZATIONAL MAINTENANCE PART 1 OF 3
DECEMBER 1983
TM-9-2320-283-20-1 - Page 223 of 926
TM 9-2320-283-20-1
TROUBLESHOOTING.
2-11.
TROUBLESHOOTING PROCEDURES (Continued).
MALFUNCTION
INSTRUCTION
INDICATION
YES
NO
32.
TACHOGRAPH CLOCK NOT WORKING.
1.
Remove circuit breaker
bracket far enough to
access circuit breaker
CB-2 (para 3-114), and
go to step 2.
2.
Check for voltage at
12-volts dc
Install cir-
Reset circuit
circuit 59-OR terminal
nominal.
cult breaker
breaker CB-1
of circuit breaker
bracket (para
and/or trouble-
CB-1.
3-114), and go
shoot CB-1 cir-
to step 3.
cuit. (Refer
to malfunction
34).
3.
Check for voltage at
12-volts dc Go to step 4.
Repair circuit
circuit 59-OR terminal
nominal.
59-OR (para
of tachograph clock.
3-127).
NOTE
With positive lead on circuit 59-OR, check ground with negative lead when doing
the following checks.
4.
Check for voltage at
12-volts dc Go to step 5.
Clean and
circuit 99S-BK ground
nominal.
tighten ground
point of instrument
point connec-
panel.
tion.
5.
Check for voltage at
12-volts dc
Replace tacho-
Repair circuit
circuit 99S-BK terminal
nominal.
graph (para
99S-BK (para
of tachograph clock.
3-309).
3-127).
2-98
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