Sony AVD-K700P / HT-V700DP Service Manual ▷ View online
10
AVD-K700P
2-2. ELECTRICAL TROUBLESHOOTING GUIDE
1. Power(SMPS) CIRCUIT
NO 5.3VA.
Replace the F101.
(Use the same Fuse)
Is the F101 normal?
Is the TH101
normal?
normal?
Is the BD101
normal?
normal?
NO
NO
NO
NO
NO
NO
Replace the
BD101.
BD101.
Replace the TH101.
Is the D105
normal?
normal?
Check or Replace
the D105.
the D105.
Replace the D129.
Replace the IC106.
YES
YES
YES
YES
YES
YES
YES
Is Vcc(8.5~21V) sup-
plied to IC104 Pin3?
plied to IC104 Pin3?
NO
Is the D129
normal?
normal?
Is there about 2.5V
at the IC106 Vref?
at the IC106 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 D126.
the D126.
Is the Vcc(13V) supplied
to (+) terminal in D126?
to (+) terminal in D126?
Check or Replace
the Motor Vcc.
the Motor Vcc.
NO
YES
YES
(2) No 12VA (TO CAP, DRUM MOTOR)
NO 5.0VA.
5.3VA Line Check.
Is 5.3VA put into
the Q167 Emitter?
the Q167 Emitter?
Is about 5V put into
the Q167 Base?
the Q167 Base?
Is the Q169 Base
“H”?
“H”?
NO
NO
Check the Power
Control.
Control.
NO
Check or Replace the
Q169, R175, R176, R177.
Q169, R175, R176, R177.
YES
YES
YES
Check or Replace
the Q167/Q169.
the Q167/Q169.
YES
(3) No 5.0V (SYS/Hi-Fi/TUNER)
11
AVD-K700P
NO 5V.
5.3VA Line Check.
Is 5.3VA put into
the Q168 Emitter?
the Q168 Emitter?
Is about 5V put into
the Q168 Base?
the Q168 Base?
Is the Q169 Base
“H”?
“H”?
NO
NO
NO
Check the Power
Control.
Control.
Check or Replace the
Q169, R175, R176, R177.
Q169, R175, R176, R177.
YES
YES
YES
YES
Check or Replace
the Q168/Q169
the Q168/Q169
(4) No 5V (TO DVD)
No 33V.
Check the Power
Control.
Control.
Is Q163 Base “H”?
Check or Replace
Q163, R168, R169.
Q163, R168, R169.
NO
YES
YES
(5) No 33V (TUNER)
NO 8V.
Check or Replace
the D126.
Is Vcc(13V) supplied to
(+) terminal in D126?
(+) terminal in D126?
Check or Replace
IC161, C163.
IC161, C163.
Is Vcc(12V) supplied
to IC160 Pin1?
to IC160 Pin1?
NO
NO
Check or Replace
the D163.
YES
YES
YES
(6) No 8V(TO DVD)
12
AVD-K700P
2. SYSTEM/KEY CIRCUIT
(1) AUTO STOP
(2) The unstable loading of a Cassette tape
Auto Stop
Does the SW30 waveform
appear at the IC501
Pin18?
appear at the IC501
Pin18?
Do the T-UP Reel Pulses
appear at the IC501 Pin80?
appear at the IC501 Pin80?
Is 12V applied to the
PMC01 Pin8?
Check the Drum Motor
signal.
signal.
Does 5V appear at the
RS501?
RS501?
Check the Q160 Power
Circuit.
Circuit.
Refer to “SMPS DRUM
12 Volt Trouble Shooting”.
12 Volt Trouble Shooting”.
Is 5V applied to the
R531 ?
R531 ?
Refer to SMPS 5.3VA
troubleshooting.
troubleshooting.
Check the IC501
Pins22, 23, 24, 25.
Pins22, 23, 24, 25.
Do T/UP Reel Pulses
appear at the point
between R556 and R536?
appear at the point
between R556 and R536?
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 Pin58 during
inserting the CST ?
at the IC501 Pin58 during
inserting the CST ?
Does the “L” signal appear
at the IC501 Pin60 during
inserting the CST?
at the IC501 Pin60 during
inserting the CST?
Check the Deck
Mechanism.
Mechanism.
Caution :
Auto stop can occur because Grease or Oil has dried up
YES
YES
YES
NO
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
13
AVD-K700P
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 Pin97?
at the IC501 Pin97?
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
Pin87?
appear at the IC501
Pin87?
On tracking do the CTL
pulses move?
pulses move?
Does the Video Envelope
waveform appear at the
IC501 Pin9?
waveform appear at the
IC501 Pin9?
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 Pin 90 and PMC01
Pin11 short?
IC501 Pin 90 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
Pin76?
appear at the IC501
Pin76?
Aren’t the foil patterns and
the Components between
IC501 Pin76 and PMC01
Pin12 short?
IC501 Pin76 and PMC01
Pin12 short?
Do the DFG Pulses appear
at the IC501 Pin90?
Do the Drum PWM Pulses
appear at the IC501
Pin76?
appear at the IC501
Pin76?
Aren’t the connecting patterns and the Components
between IC501 Pin76 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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