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Ariejan de Vroom 2017-09-14 09:57:30 +02:00
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content/posts/2017-09-11-denon-avr-4520-repair.md
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@ -22,7 +22,7 @@ components. After some haggling I bought the unit and received it a few days lat
![Denon AVR-4520 - Back view](/img/denon-avr4520-backview.jpg) ![Denon AVR-4520 - Back view](/img/denon-avr4520-backview.jpg)
## Diagnosis ## Diagnostic
With the **Denon AVR-4520** on my bench I was ready to start diagnostics. With the **Denon AVR-4520** on my bench I was ready to start diagnostics.
@ -155,6 +155,11 @@ actual repair. The process is quite simple:
Done. Done.
While I wait for the replacement parts to arrive, I figured I'd start using the amp already.
I have a 2.1 setup, bi-amping the front speakers. Luckily, the AVR allows me to select which
channel (Surround Back or Front Height) to use for this. I disconnected the `SBR` and `SBL`
amp board as I won't be using them and circumventing the DC power protection problem.
## Conclusion ## Conclusion
Replacing the DHCT-A3/C3 darlington transistor pair has resolved the power protection mode Replacing the DHCT-A3/C3 darlington transistor pair has resolved the power protection mode