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Page Title:
Table 3-4. DC Voltage Chart No. 2 - Power Supply |
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 TM 9-4910-736-14&P
DC Voltage Chart No. 2 - Power Supply
NOTE
All voltages are measured between point specified and pin E22 (instrument
ground) with DC VTVM. Battery voltage is assumed to be 12 V. All voltages
are 20%.
FUNCTION switch position:
COND or COIL
CONDENSER switch position:
Any position
OHMMETER RANGE position:
Any position
Set to 12 o'clock
ZERO ADJ Control:
Step
Action:
Action:
Test
Normal
voltage
no.
point
voltage normal
voltage abnormal
1
11.5 v
A20 + Out
Proceed to step 2.
Replace A20.
2
Q2 Out
8V
Proceed to step 3.
Replace Q2.
Q4 E
0.6 V
Proceed to step 6.
Proceed to step 4.
3
4
6.2 V
E 29
Proceed to step 5.
Inspect wires leading from E6
and E29 to ZERO ADJ control
R103 .
1.2 v
A 21
a. If measured voltage is
Repeat step 3.
5
Pin 7
0.6 V higher than in
step 3, replace A21.
b. If measured voltage is
below 0.8 volt, replace
A21.
c. If measured voltage is
much higher than in step 3,
replace Q4.
6
2.5 V
a. Inspect leads from pins E18
a. PILOT light off.
Replace CR24.
and E22 leading to CR24.
b. Replace CR24.
b. PILOT light on.
NO action to be
taken.
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