Philips DVP721VR Service Manual page 101

MECHANISM TROUBLESHOOTING GUIDE
E.
No tape winding is done in
play.
Is the pinch roller attached to the
Capstan shaft in operation of play?
YES
Does the T/up reel operate?
YES
Does the Capstan motor turn?
YES
Does the drum motor turn?
YES
Is the DPG, DFG normal?
YES
Are the T/up and the reel sensor
normal?
YES
Check the Syscon circuit.
4-25
NO
Check the assembly mode?
NO
Is the Capstan belt hung?
YES
Check the clutch and the idler
assembly.
NO
Is normal voltage applied to the
capstan motor Vcc1, Vcc2?
YES
Is the Vctl terminal voltage of
the Capstan motor applied at
more than 4V?
YES
Replace the Capstan motor.
NO
Is the Vcc voltage of the drum
motor normal?
YES
Is the Vctl terminal voltage of the
drum motor at more than 2.3V?
YES
Replace the drum motor.
NO
Hang the Capstan belt.
NO
Check the Servo, power circuit.
NO
Check the Syscon circuit.
NO
Check the Syscon circuit.