3-7
3. SERVO CIRCUIT
3-1. Unstable Video in PB MODE
3-2. When the Drum Motor
doesn’t run.
YES
YES
YES
Does 12V
appear at PMC01
Pin8?
YES
Does 2.8V
appear at PMC01
Pin12?
Do the
Drum PWM Pulses
appear at the IC501
Pin34?
Do the DFG
Pulses appear at the
IC501 Pin104?
Unstable Video in
PB Mode.
YES
YES
YES
When the Drum Motor
doesn’t run,
Does the Noise level of the
screen change periodically?
NO
YES
YES
On tracking
do the CTL pulses
move?
Replace the IC501.
NO
Do the
DFG Pulses appear
at the PMC01
Pin11?
NO
Refer to “(2)
No 12VA of Power section”
Aren’t the foil patterns and
the Components between
IC501 Pin34 and PMC01
Pin12 short?
Aren’t the connecting patterns and the Components
between IC501 Pin34 and PMC01 Pin12 short?
NO
Replace the Cap M.
Aren’t the foil patterns and
the Components between
IC501 Pin 104 and PMC01
Pin11 short?
NO
NO
NO
Do the
Drum PWM Pulses
appear at IC501
Pin34?
YES
Replace the IC501.
NO
YES
YES
Does the
Video Envelope waveform
appear at the IC501
Pin82?
Refer to “When the Y
signal doesn’t appear on
the screen in PB Mode”.
Does the CFG waveform
appear at the IC501 Pin67?
Replace the IC501.
Check the connector
(PMC01) and the Drum
Motor Ass’y.
VCR ELECTRICAL TROUBLESHOOTING GUIDE
Summary of Contents for DVP3350V/01
Page 17: ...2 8 MEMO ...
Page 45: ...3 37 3 38 5 TUNER CIRCUIT DIAGRAM ...
Page 51: ...3 49 3 50 IC301_LA71750EM IC501_MN101D10X IC801_TDA9605H IC751_MSP3417 3407 ...
Page 52: ...3 51 3 52 PRINTED CIRCUIT BOARD DIAGRAMS 1 MAIN P C BOARD TOP SIDE ...
Page 53: ...3 53 3 54 2 MAIN P C BOARD BOTTOM SIDE ...
Page 54: ...3 55 3 56 3 POWER P C BOARD ...
Page 55: ...3 57 3 58 4 KEY P C BOARD ...
Page 77: ...3 80 MEMO ...
Page 78: ...3 81 3 82 CIRCUIT DIAGRAMS 1 MPEG CIRCUIT DIAGRAM ...
Page 79: ...3 83 3 84 2 SERVO CIRCUIT DIAGRAM ...
Page 80: ...3 85 3 86 3 JACK CIRCUIT DIAGRAM ...
Page 113: ...4 32 MEMO ...
Page 119: ...5 6 MEMO ...
Page 121: ...5 9 5 10 MEMO MEMO ...