Hitachi DV-RV8500E/UK Service Manual page 25

Details of Servicing and Troubleshooting > Troubleshooting
No 12VA
(power supply of capstan/cylinder motors)
No
Is 13 V supplied
to C130?
Yes
No
D132 cathode: Voltage?
Yes
Check capstan motor and
cylinder motor, and
replace if necessary.
FL display does not light.
No
R107: Normal?
Yes
No
D128 cathode: Voltage?
Yes
No
ZD151: Normal?
Yes
Check D127, and
replace if necessary.
No 33V
No
Is 33 V supplied
to Q123-E?
Yes
No
Q123-B: "Lo"?
Yes
Check Q123, and
replace if necessary.
Check D126, and
replace if necessary.
Replace D132.
Check R107, and
replace if necessary.
Check D128, and
replace if necessary.
Check ZD151, and
replace if necessary.
Check D130, and
replace if necessary.
Check
the 'PWR CTL H' line
from SYSTEM circuit.
3 - 5
No REG12V
No
Is 13 V supplied
to Q126-C?
Yes
No
Is 33 V supplied
to Q126-B?
Yes
Is there "Hi" signal
No
on 'PWR CTL H' line
from SYSTEM circuit?
Yes
Check D126, and
replace if necessary.
No CAP Vcc power supply
No
Is 30 V supplied
to Q120-C?
Yes
No
Is 30 V supplied
to Q120-B?
Yes
No
Is 33 V supplied
to Q121-C?
Yes
Check Q120, and
replace if necessary.
Check D126, and
replace if necessary.
Check 33V line.
Check
SYSTEM microprocessor.
Check D129, and
replace if necessary.
Check ZD153, and
replace if necessary.
Check 'HSR H' line
from SYSTEM circuit?
Check Q121, Q122
and 33V line.