Sony AVD-K150B / AVD-K150E / AVD-K150G / AVD-K150N / AVD-K150R / DAV-D150B / DAV-D150E / DAV-D150G / DAV-D150N Service Manual ▷ View online
17
AVD-K150B/K150E/K150G/K150N/K150R
3-2. ELECTRICAL TROUBLESHOOTING GUIDE
1. Power (SMPS) CIRCUIT
NO 5.3VA.
Replace the F101.
(Use the same Fuse)
Is the F101 normal?
Is the R101
normal?
normal?
Is the BD101
normal?
normal?
NO
NO
NO
NO
NO
NO
Replace the
BD101.
BD101.
Replace the R101.
Is the D102
normal?
normal?
Check or Replace
the D102.
the D102.
Replace the D112.
Replace the IC103.
YES
YES
YES
YES
YES
YES
YES
Is Vcc(8.5~21V) sup-
plied to IC101 Pin7?
plied to IC101 Pin7?
NO
Is the D112 normal?
Is there about 2.5V
at the IC103 Vref?
at the IC103 Vref?
Check the Main PCB
5.3VA/5.0V Line short?
5.3VA/5.0V Line short?
(1) No 5.3VA (SYS/Hi-Fi/TUNER)
NO 12VA.
Check or Replace
the D110.
the D110.
Is the Vcc(13V) supplied
to (+) terminal in D115?
to (+) terminal in D115?
Check or Replace
the Motor Vcc.
the Motor Vcc.
Is the Vcc(12V) supplied
to (-) terminal in D115?
to (-) terminal in D115?
NO
NO
Replace the D115.
YES
YES
YES
(2) No 12VA (TO CAP, DRUM MOTOR)
NO 5.0VA.
5.3VA Line Check.
Is 5.3VA put into
the Q160 Emitter?
the Q160 Emitter?
Is about 5V put into
the Q160 Base?
the Q160 Base?
Is the Q162 Base
“H”?
“H”?
NO
NO
Check the Power
Control.
Control.
NO
Check or Replace the
Q162, R157, R158, R159.
Q162, R157, R158, R159.
YES
YES
YES
Check or Replace
the Q162/Q160.
the Q162/Q160.
YES
(3) No 5.0V (SYS/Hi-Fi/TUNER)
18
AVD-K150B/K150E/K150G/K150N/K150R
NO 5V.
5.3VA Line Check.
Is 5.3VA put into
the Q160 Emitter?
the Q160 Emitter?
Is about 5V put into
the Q160 Base?
the Q160 Base?
Is the Q162 Base
“H”?
“H”?
NO
NO
NO
Check the Power
Control.
Control.
Check or Replace the
Q162, R157, R158, R159.
Q162, R157, R158, R159.
YES
YES
YES
YES
Check or Replace
the Q162/Q160
the Q162/Q160
(4) No 5V (TO DVD)
No 33V.
Check the Power
Control.
Control.
Is Q163 Base “H”?
Check or Replace
Q161, R154, R155.
Q161, R154, R155.
NO
YES
YES
(5) No 33V (TUNER)
19
AVD-K150B/K150E/K150G/K150N/K150R
2. SYSTEM/KEY CIRCUIT
(1) AUTO STOP
(2) The unstable loading of a Cassette tape
Auto Stop
Does the SW25 waveform
appear at the IC501
Pin105?
appear at the IC501
Pin105?
Do the T-UP Reel Pulses
appear at the IC501 Pin49?
appear at the IC501 Pin49?
Is 12V applied to the
PMC01 Pin8?
Check the Drum Motor
signal.
signal.
Does 5.2V appear at the
RS501?
RS501?
Check the Power Circuit.
Check the Power.
Is 5.3V applied to the
R544 ?
R544 ?
Refer to SMPS 5.3VA
troubleshooting.
troubleshooting.
Check the IC501
Pins68, 69, 70, 71.
Pins68, 69, 70, 71.
Do T/UP Reel Pulses
appear at the Q514
Base terminal ?
appear at the Q514
Base terminal ?
Replace the T/UP Reel
Sensor (RS501).
Sensor (RS501).
Check the CST SW and
the peripheral circuitry.
the peripheral circuitry.
Replace the IC501.
The unstable loading of a
Cassette tape
Cassette tape
Does the “H” signal appear
at the IC501 Pin30 during
inserting the CST ?
at the IC501 Pin30 during
inserting the CST ?
Does the “L” signal appear
at the IC501 Pin72 during
inserting the CST?
at the IC501 Pin72 during
inserting the CST?
Check the Deck
Mechanism.
Mechanism.
Caution :
Auto stop can occur because Grease or Oil is dried up
YES
YES
YES
NO
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
20
AVD-K150B/K150E/K150G/K150N/K150R
3. SERVO CIRCUIT
(1) Unstable Video in PB MODE
Unstable Video in
PB Mode.
PB Mode.
Does the Noise level of the
screen change
periodically?
screen change
periodically?
Do the CTL pulses appear
at the IC501 Pin8?
at the IC501 Pin8?
Is adjusting the height of
the CTL Head accurate?
the CTL Head accurate?
Readjust the height of the
CTL Head.
CTL Head.
Replace the IC501.
Refer to “When the Y signal
doesn’t appear on the
screen in PB Mode”.
doesn’t appear on the
screen in PB Mode”.
Does the CFG waveform
appear at the IC501
Pin9?
appear at the IC501
Pin9?
On tracking do the CTL
pulses move?
pulses move?
Does the Video Envelope
waveform appear at the
IC501 Pin24?
waveform appear at the
IC501 Pin24?
Replace the IC501.
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
(2) When the Drum Motor
(2)
doesn’t run.
Do the DFG Pulses appear
at the PMC01 Pin11?
at the PMC01 Pin11?
Replace the Cap M.
Aren’t the foil patterns and
the Components between
IC501 Pin104 and PMC01
Pin11 short?
IC501 Pin104 and PMC01
Pin11 short?
Replace the IC501.
Refer to “(2)
No 12VA of Power section”
No 12VA of Power section”
Do the Drum PWM Pulses
appear at the IC501
Pin107?
appear at the IC501
Pin107?
Aren’t the foil patterns and
the Components between
IC501 Pin107 and PMC01
Pin12 short?
IC501 Pin107 and PMC01
Pin12 short?
Do the DFG Pulses appear
at the IC501 Pin104?
Do the Drum PWM Pulses
appear at the IC501
Pin107?
appear at the IC501
Pin107?
Aren’t the connecting patterns and the Components
between IC501 Pin107 and PMC01 Pin12 short?
When the Drum Motor
doesn’t run,
doesn’t run,
Does 12V appear at the
PMC01 Pin8?
PMC01 Pin8?
Does 2.8V appear at the
PMC01 Pin12?
PMC01 Pin12?
Check the connector
(PMC01) and the Drum
Motor Ass’y.
(PMC01) and the Drum
Motor Ass’y.
NO
YES
YES
YES
NO
NO
NO
NO
NO
YES
YES
YES
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