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3-8
3. SERVO CIRCUIT
(1) Unstable Video in PB MODE
Unstable Video in
PB Mode.
Does the Noise level of the
screen change
periodically?
Replace the IC501.
Refer to “When the Y signal
doesn’t appear on the
screen in PB Mode”.
Does the CFG waveform
appear at the IC501
Pin67?
On tracking do the CTL
pulses move?
Does the Video Envelope
waveform appear at the
IC501 Pin82?
Replace the IC501.
YES
YES
YES
YES
YES
NO
NO
(2) When the Drum Motor
(2)
doesn’t run.
Do the DFG Pulses appear
at the PMC01 Pin11?
Replace the Cap M.
Aren’t the foil patterns and
the Components between
IC501 Pin 104 and PMC01
Pin11 short?
Replace the IC501.
Refer to “(2)
No 12VA of Power section”
Do the Drum PWM Pulses
appear at the IC501
Pin34?
Aren’t the foil patterns and
the Components between
IC501 Pin34 and PMC01
Pin12 short?
Do the DFG Pulses appear
at the IC501 Pin104?
Do the Drum PWM Pulses
appear at the IC501
Pin34?
Aren’t the connecting patterns and the Components
between IC501 Pin34 and PMC01 Pin12 short?
When the Drum Motor
doesn’t run,
Does 12V appear at the
PMC01 Pin8?
Does 2.8V appear at the
PMC01 Pin12?
Check the connector
(PMC01) and the Drum
Motor Ass’y.
NO
YES
YES
YES
NO
NO
NO
NO
NO
YES
YES
YES
Summary of Contents for V9120QW1M
Page 40: ...3 38 3 39 5 SCART JACK CIRCUIT DIAGRAM A B C D E F G H I J K L M N O P Q R S T SCART OPTION ...
Page 45: ...3 48 3 49 PRINTED CIRCUIT DIAGRAMS 1 MAIN P C BOARD TOP SIDE LOCATION GUIDE ...
Page 46: ...3 50 3 51 2 MAIN P C BOARD BOTTOM SIDE LOCATION GUIDE ...
Page 47: ...3 52 3 53 3 POWER P C BOARD LOCATION GUIDE ...
Page 48: ...3 54 3 55 5 TIMER P C BOARD 4 KEY P C BOARD ...
Page 61: ...3 68 F FE RFL FIG 7 2 DVD F FE RFL FIG 7 3 CD ...
Page 62: ...3 69 F FE RFL FIG 7 4 CD 8 FOCUS ON WAVEFORM FE FOSO F F FIG 8 1 DVD ...
Page 66: ...3 73 13 MT1389 AUDIO OUTPUT TO AUDIO DAC 2 COMPOSITE VIDEO SIGNAL FIG 12 2 FIG 13 1 ...
Page 67: ...3 74 FIG 14 1 14 AUDIO OUTPUT FROM AUDIO DAC ...
Page 72: ......
Page 73: ...3 79 3 80 A B C D E F G H I J K L M N O P Q R S T CIRCUIT DIAGRAMS 1 SYSTEM CIRCUIT DIAGRAM ...
Page 74: ...3 81 3 82 2 RF DSP SERVO CIRCUIT DIAGRAM A B C D E F G H I J K L M N O P Q R S T ...
Page 75: ...3 83 3 84 3 AV JACK CIRCUIT DIAGRAM A B C D E F G H I J K L M N O P Q R S T ...
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