Read Sony AVD-K700P / HT-V700DP Service Manual online
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
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