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Page Title:
Table 6-1. Meter Test Circuit Troubleshooting (cont) |
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 C1, TM 11-6625-646-15
Trouble
Probable cause
Remedy
Faulty wiring between J69 and J67,
Check continuity of circuits; repair
between J67 and switch S7 or
wiring as required.
between switch S7 and Meter M1.
Defective switch S7
Clean or replace switch.
Function meter M1 does not indi-
Test voltage not properly con-
Check the test voltage at J71 and
cate in the green area; FUNC-
nected to J71.
that the test voltage is properly
TION switch at AMPL OUPT
connected.
and 3.8 vdc test voltage is con-
nected between pins 15(-) and
17(+) of J71.
Load resistors R305, R306 or meter
Replace component card
multiplier resistor R307 de-
A02V3064. If this does not correct
fective.
the trouble, reinstall the original
card.
Faulty wiring between J69 and J67,
Check continuity of the circuits;
between J67 and switch S7, or
repair wiring as required.
between switch S7 and meter
M1.
Defective switch S7 .
Clean or replace switch.
Function meter M1 does not indi-
Defective meter rectifier stage or
Replace component card
cate in the green area; FUNC-
meter multiplier resistor R403.
A02V3068. If this does not
TION switch at ROLL FEED-
correct the trouble, reinstall the
BACK POT. EXCITATION
original card.
and external 2.5 vac test signal
connected between MAIN CON-
NECTOR TEST POINTS X
and V.
Faulty wiring or defective switch
Check continuity through the
S5 or S7.
circuit (fig. 1-4). Repair wiring;
clean or replace switches as
required.
Function meter M1 does not indi-
Defective meter rectifier stage or
Replace component card
cate in the green area; FUNC-
meter multiplier resistor R404.
A02V3068. If this does not
TION switch at PITCH FEED-
correct the trouble, reinstall the
BACK POT. EXCITATION and
original card.
external 2.5 vac test voltage is
connected between MAIN CON-
NECTOR TEST POINTS e and
c.
Faulty wiring or defective switch
Check continuity through the
S5 or S7.
circuit (fig. 1-4). Repair wiring,
clean or replace switches as
required.
Function meter M1 does not indi-
Defective meter rectifier stage or
Replace component card
cate in the green area; FUNC-
multiplier resistor R405 defective.
A02V3068. If this does not
TION switch in SEC FEED-
correct the trouble, reinstall the
BACK POT. EXCITATION and
original card.
2.5 vac test voltage is .connected
between MAIN CONNECTOR
TEST POINTS q and k.
Faulty wiring or defective switch
Check continuity through the
S5 or S7.
circuit (fig. 1-4). Repair
wiring, clean, or replace
switches as requi red.
47
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