TROUBLESHOOTING GUIDE
AUDIO CAN NOT BE RECORDED
Is BIAS waveform appeared ?
No
Yes
Is the voltage at pin 92
of IC4501 5V ?
No
Yes
Check POWER BLOCK.
L4503 is broken or shorted.
Check peripheral circuit.
No
Is there AUDIO signal at
pin 1 of IC4501 ?
Yes
Check the circuit of 21pin and
TUNER.
Is there AUDIO signal
at pin 6 of IC4501 ?
No
Yes
Check IC4501 and the peripheral
circuit.
Replace IC4501.
Check the lead wire and connector
to A/C HEAD.
No
Yes
CASSETTE CAN BE LOADED
BUT UNIT HAS NO FUNCTIONS
Does mode indicator
appear in Display ?
Check LOADING MOTOR, MODE
SWITCH and the peripheral parts.
Does VCR operate with
the remote control?
Check IC1006.
Replace SW1001.
Yes
No
E-12
Summary of Contents for VTW21FQR
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