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@ -147,18 +147,26 @@ With that, I've narrowed the problem down to `Q808`, a `DHCT-C3` darlington tran
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## Repair
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## Repair
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As with almost every project, diagnosign the issue is much harder and time consuming than the
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As with almost every project, diagnosing the issue is much more time consuming than the
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actual repair. The process is quite simple:
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actual repair. I ordered a _new old stock_ pair of transistors, this is a set of complimentary
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`-A3` and `-C3` transitors including two insulating washers.
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1. Order a new pair DHCT-A3/C3 (they are sold in pairs)
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![](/img/denon-avr2520-new-transistors.jpg)
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2. Replace both `Q808` and `Q809` with the new pair
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Done.
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Next it's a simple job to remove the old darlington transistors...
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While I wait for the replacement parts to arrive, I figured I'd start using the amp already.
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![](/img/denon-avr4520-new-and-old.jpg)
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I have a 2.1 setup, bi-amping the front speakers. Luckily, the AVR allows me to select which
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channel (Surround Back or Front Height) to use for this. I disconnected the `SBR` and `SBL`
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and place the new ones.
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amp board as I won't be using them and circumventing the DC power protection problem.
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![](/img/denon-avr4520-new-transistors-soldered.jpg)
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Finally re-insert the amp board into the amp with some fresh heatsink compound.
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**Do not
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forget to add the insulating washers to prevent them from shorting out via the heatsink!**
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![](/img/denon-avr4520-final-solution.jpg)
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## Conclusion
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## Conclusion
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@ -166,7 +174,11 @@ Replacing the DHCT-A3/C3 darlington transistor pair has resolved the power prote
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issues. I've been running the amp in my living room for a few days now and not seen any
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issues. I've been running the amp in my living room for a few days now and not seen any
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issue at all.
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issue at all.
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So, for the cost of a used entry-level AV receiver and € 20 in parts I've got
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![](/img/denon-avr4520-final-setup.jpg)
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So, for the cost of a used entry-level AV receiver and about €15 in parts I've got
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an almost brand new Denon AVR-4520 top-of-the-line AV Receiver. :-)
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an almost brand new Denon AVR-4520 top-of-the-line AV Receiver. :-)
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_For those interested, I'm using the `SBR/SBL` channels to bi-amp my speakers._
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[hifiengine]: https://www.hifiengine.com/manual_library/denon/avr-4520.shtml
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[hifiengine]: https://www.hifiengine.com/manual_library/denon/avr-4520.shtml
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static/img/denon-avr4520-new-and-old.jpg
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