Hello, I recently started troubleshooting my onkyo tx-nr509 receiver that refuses to turn on.
I suspect the issue is the power supply, but all of the capacitors appear to be fine. The output I measured does not match the specifications on the board, however. The +12VD_ST and +10VS pins on the output both measure around +15v referenced to the GNDDG pin. Fuse is fine, primary side of transformer is receiving 115v ac, output of secondary is about 12.3v ac.
The output voltage has no ripple, but drops significantly when i add a resistor across the output to about 5v with a 1k resistor. The output of the secondary also drops significantly.
Since the capacitors look fine, I suspect the issue lies in the transformer or rectification diodes. Any ideas on what my issue could be? Am I on the right track? What would be my options for a replacement transformer?
Thanks!
I suspect the issue is the power supply, but all of the capacitors appear to be fine. The output I measured does not match the specifications on the board, however. The +12VD_ST and +10VS pins on the output both measure around +15v referenced to the GNDDG pin. Fuse is fine, primary side of transformer is receiving 115v ac, output of secondary is about 12.3v ac.
The output voltage has no ripple, but drops significantly when i add a resistor across the output to about 5v with a 1k resistor. The output of the secondary also drops significantly.
Since the capacitors look fine, I suspect the issue lies in the transformer or rectification diodes. Any ideas on what my issue could be? Am I on the right track? What would be my options for a replacement transformer?
Thanks!
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