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C1, TM 11-6625-646-15
Table 6-1. Meter Test Circuit Troubleshooting
Trouble
Probable cause
Remedy
Function meter M1 does not indi-
Defective meter multiplier resistor
Measure the resistance of R201;
cate in the green area; FUNC-
R201 or defective wiring.
check for continuity between
TION switch at DC PWR and
R201 and J60-A and M1+. Re-
25 vdc test voltage is connected
place the resistor or repair
between MAIN CONNECTOR
wiring as required.
TEST POINTS A(+) and C(-)
No ground return on function
Check continuity to ground from
meter circuit.
the negative terminal of function
meter M1. Repair wiring, clean
or replace switch S7 as required.
Function meter defective
Check the meter at several posi-
tions of switch 57 and observe
the meter for proper operation.
Replace the meter if found
defective.
Function meter M1 does not indi-
Calibrating resistor R406, shunt
Replace component card
cate in the green area; FUNC-
resistor R407, or meter rectifier
A02V3068. If this does not
TION switch at AC PWR and
stage defective.
correct the trouble, reinstall the
115 vac test voltage is connected
original card.
between MAIN CONNECTOR
TEST POINTS i and C.
No ac voltage at input to metering
Check for 26 volts ac between
circuit.
pins 12 and 13 of J68. If voltage
is not present, troubleshoot the
circuit to T501. Check resistance
to ground from pin 11 of J68.
If resistance is not 750 ohms,
troubleshoot the circuit through
switch S7.
Function meter defective
Check the meter at several posi-
tions of switch S7 and observe
the meter for proper operation.
Replace the meter if found
defective.
Function meter M1 does not indi-
Meter multiplier resistor R202
Replace component card
cate in the green area; FUN-
defective.
A02V3060. If this does not
TION switch at INTLK and 28
correct the trouble, reinstall the
vdc test voltage is connected
original card.
between MAIN CONNECTOR
TEST POINTS D(+) and
Faulty wiring between pin jacks
Check continuity between the pin
D and C and the function meter
jacks and the multimeter.
M1.
Repair wiring as required.
Function meter M1 does not indi-
Test voltage not properly connected
Check the test voltage at J69 and
cate in the green area; FUNC-
to J69.
that the test voltage is properly
TION switch at DEM OUPT
connected.
and 3.9 vdc test voltage is con-
nected between pins 15(-) and
17(+) of J69.
Load resistors R302, R303, or
Replace component card
meter multiplier resistor R304
A02V3064. If this does not
defective.
correct the trouble, reinstall the
original card.
46

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