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Page Title:
Table 3-3. DC Voltage Chart No. 1 - Protection Circuit |
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 TM 9-4910-736-14&P
DC Voltage Chart No. 1 - Protection Circuit
NOTE
All voltages are measured with a DC VTVM between point specified and pin E19.
All voltages are 20%. Battery voltage is assumed to be 12 V.
FUNCTION switch position:
COND
Step
Normal
Test
Action:
Action:
point
no
voltage
voltage normal
voltage abnormal
1
12 v
Pin E16
Proceed to step 2.
Inspect positive and negative
battery leads connection on
battery side and pin E16,
E19 side.
2
Pin El
12 v
Proceed to step 3.
Inspect wire connecting pin El
and lug 9, Section 1, front
of FUNCTION switch.
11.3 v
Pin E4
Proceed to step 4.
Replace CR1.
3
4
Pin E3
11.3 v
Proceed to step 5.
a. Check window of PUSH TO
RESET switch. If window
is red, depress switch.
b. Inspect wire between pin E4
and lug 1 of circuit
breaker CB1.
c. Inspect wire between pin E3
and lug 2 of circuit
breaker CB1.
d. Replace circuit breaker CB1.
Ql In
11.3 v
Proceed to step 6.
5
Inspect copper side of
printed circuit board for cold
solder or open circuit between
Ql - In and pin E3.
6
Q1 out
Proceed to step 7.
Replace Q1.
5V
4.4 V
Proceed to step 8.
Replace Q3.
7
Q3 E
8
Proceed to step 9.
5.3 V
a. Measured voltage: 12 V.
Q3 C
CR3 or relay K1 shorted;
Remove short.
b. Measured voltage: Less
than Q3-E. Relay K1 open.
Replace K1.
12 v
A20 + In
Proceed to table
Replace relay K1.
9
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