TROUBLESHOOTING GUIDE
E-14
Yes
No
Is the voltage at pin 2
of L4005 5V?
L4003 is broken or shorted.
Check peripheral circuit.
No
Yes
Check POWER BLOCK.
Yes
No
Is there AUDIO signal at
pins 7 or 8 or 9 of IC4001?
AUDIO CAN NOT BE
RECORDED
Is there BIAS at pin 4
of IC4001?
Check the circuit of 21 PIN and
TUNER.
Is there signal at pin
11 of IC4001?
Yes
No
Check the lead wire and connector
to A/C HEAD.
Replace IC4001.