Deck Mechanism - Philips DVP721VR Service Manual

MECHANISM TROUBLESHOOTING GUIDE

1.Deck Mechanism

A.
No Auto Rewind operates.
YES
Is output of the end sensor "H"?
"H": 3.5V or less
"L": 0.7V –1V or less
YES
Is voltage at both ends of the
IR LED 0.8V-1.5?
YES
Is the Syscon checked?
B.
No F/R operates.
YES
Is the current mode an F/R
mode?
YES
Does the Capstan motor rotate?
YES
Does the T/up and the supply
reel Operate?
YES
Check the Syscon circuit.
4-23
NO
Is the end sensor Vcc applied at
5V?
YES
Replace the end sensor.
NO
Replace the LED.
NO
Check the assembly position of
the Mode S/W.
NO
Is normal voltage applied at the
Vcc1 and the Vcc2 of the
Capstan motor?
YES
Is the Vctl terminal voltage of the
Capstan Motor applied at more
than 4V?
YES
Replace the Capstan motor.
NO
Check the Syscon power supply.
NO
Check the Servo, Power
circuit.