NAD T517AHT Service Manual page 16

ELECTRICAL TROUBLESHOOTING GUIDE
No REG 5.0V
YES
Is the Vcc(=5.6V)
•
•
supplied to Q126
Collector?
YES
Is the Vcc(=12V)
•
•
supplied to Q126
Base?
YES
Check or Replace the Q126
No 12V
YES
Is the Vcc(=14V)
•
•
supplied to Q123
Collector?
YES
Is the Vcc(=12V)
•
•
supplied to Q126
Base?
YES
Check or Replace the Q123
NO
Check or Replace the D123
NO Check the 'PWR CTL "H"'
signal from μ-com
NO
Check or Replace the D125
NO Check the 'PWR CTL "H"'
signal from μ-com
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