JVC HR-XV45SEF Service Manual page 40

5.1.2 SYSTEM/KEY CIRCUIT
(1) AUTO STOP
Auto Stop
YES
Does the SW25 waveform
appear at the IC501
Pin23?
YES
Do the T-UP Reel Pulses
appear at the IC501 Pin3?
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 Pin32 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
1-40 (No.YD070)
NO
Check the Drum Motor
signal.
Do T/UP Reel Pulses
NO
appear at the Q514 Base
terminal?
YES
Replace the T/UP Reel
Sensor (RS501).
NO
NO
Check the CST SW and
the peripheral circuitry.
NO
NO
Does 5.0V appear at the
RS501?
YES
Check the Power Circuit.
Check the Power.
Is 5.0V applied to the
R544 ?
NO
YES
Refer to SMPS 5.3VA
troubleshooting.
Check the IC501
Pins 86, 87, 88, 89.
NO