Sony AVD-K600P Service Manual page 16

AVD-K600P
2. SYSTEM/KEY CIRCUIT
(1) AUTO STOP
Auto Stop
YES
Does the SW30 waveform
appear at the IC501
Pin18?
YES
Do the T-UP Reel Pulses
appear at the IC501 Pin80?
YES
Replace the IC501.
(2) The unstable loading of a Cassette tape
The unstable loading of a
Cassette tape
YES
Is 12V applied to the
PMC01 Pin8?
YES
Does the "H" signal appear
at the IC501 Pin60 during
inserting the CST ?
YES
Does the "L" signal appear
at the IC501 Pin19 during
inserting the CST?
YES
Check the Deck
Mechanism.
Caution :
Auto stop can occur because Grease or Oil is dried up
16
NO
Check the Drum Motor
signal.
Do T/UP Reel Pulses
NO
appear at the point
between R556 and R536?
YES
Replace the T/UP Reel
Sensor (RS501).
NO
NO
Check the CST SW and
the peripheral circuitry.
NO
NO
Does 5V appear at the
RS501?
YES
Check the Q160 Power
Circuit.
Refer to "SMPS DRUM
12 Volt Trouble Shooting".
Is 5V applied to the
R531 ?
YES
NO
Refer to SMPS 5.3VA
troubleshooting.
Check the IC501
Pins22, 23, 24, 25.
NO