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4-2. +12V is not supplied.
START
Are +5V and -12V supplied normally ?
NO
Repair
1. In case of all outputs stop, refer to the +5V troubleshooting.
YES
Is the voltage at IC3 1-3 pin 12.5V or more ?
NO
Repair
1. When the voltage between IC3 1-3 pin is 12.5V or lower, +12V is not supplied. 2. D16 open may be the cause.
YES
NO
Is +12V supplied ? Repair
1. IC3 trouble may be the cause.
YES
OK
4-3. �12V is not supplied.
START
Are +5V and +12V supplied normally ?
NO
1. In case of all outputs stop, refer to the +5V troubleshooting.
Repair
YES
Is the voltage at IC4 1-2 pin -14V or more ?
NO
Repair
1. When the voltage between IC4 1-3 pin is �14V or lower, �12V is not supplied. 2. D17 open may be the cause.
YES
NO
Is -12V supplied ? Repair
1. IC4 trouble may be the cause.
YES
OK
6�5
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