Troubleshooting Mechanical Block - Hitachi DV-RV8500E/UK Service Manual

Details of Servicing and Troubleshooting > Troubleshooting

3-2-2 Troubleshooting mechanical block

(1) Deck mechanism
No auto rewind at end of tape
Does supply end sensor
No
(ES502) output "Hi"?
"Hi": At least 3.5V
"Lo": 0.7V or less to 1V
Yes
No
IR LED (LD501):
0.8-1.5 V?
Yes
Check SYSTEM circuit
(replace IC501)
No fast forward or rewind
No
Is the position of
mode SW appropriate?
Yes
No
Does capstan motor
rotate?
Yes
SYSTEM circuit
(replace IC501).
No
Is 5 V supplied to
end sensor?
Yes
Replace supply end
sensor (ES502).
Replace IR LED (LD501).
Align the boss of mode
SW and hole in drive
gear, and assemble them
(see page 4-4).
No
Is power supplied
to PMC01-2?
Yes
Replace capstan motor.
Check 5.0V line.
Check CAP Vcc line.
Stops automatically during playback and
search
Is pressure roller
No
compressed to
capstan shaft?
Yes
No
Do supply/take-up reel
sensors output pulses?
Yes
Check
SYSTEM microprocessor,
and replace if
necessary.
3 - 14
Check position
alignment of cam gear
(see page 4-15).
Replace reel sensors.