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Denon AVR-1609 Power Supply & Speaker Popping / Relay Repair

Richard P

Richard P

Now Many Reel to Reels is Too Many
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Just a quick summary of a couple of easy fixes i did to resurect a clean but dead Denon AVR-1609 in case anyone else wants to work on one of these:

- Checked the power supply expecting the typcial 7815/7915 regulator failures and found no voltage feeding them. Traced the problem down to a shorted rectifier diode (D523 - 1N4007) which also took out the 4 resistors feeding the diodes (R516~R519 - 0R22). Replaced all 4 diodes and the burned resistors and it powered right up but the front speakers popped on power up/power down.
- Pulled the speaker relay (RLY542) thinking it was stuck closed. It was fine. The transistor (Q542 - KRC107M) that switches the relay didn't show any shorts, but the reading between the legs were about half of the other transistors for the rest of the relays. Swapped it out with the transistor for the Zone 2 relay and it worked perfectly, so I ordered a replacement NOS transistor off ebay and put it all back together

Back to 100% and sounding great. Fun little project. Hope it helps someone. Probably a similar layout for other Denon models.
 
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im having the same issue with a 1609 but now i have a loud pop with a loud buzz for about a second and then is normal after i turn it on. Good sound after the buzz i changed the 4 resistors and the 4 diodes and the q542. i cant seem to trace it. any ideas?
 
stormchsr said:
im having the same issue with a 1609 but now i have a loud pop with a loud buzz for about a second and then is normal after i turn it on. Good sound after the buzz i changed the 4 resistors and the 4 diodes and the q542. i cant seem to trace it. any ideas?
Click to expand...

Welcome to A.k... I think the O.Post fixed other areas noted and perhaps follow his path to finish or diagnose further. Noting pops etc like you have?
 
As Binkman suggested, you need to check the other channels & components in the output relay circuits. Q542 is only for Front-A relay. It could be one of the others. Isolate which output is causing the noise then troubleshoot the components within that circuit. an extract of the schematic is attached.

Rich

1609 SPKR.JPG
 
ive not been able to find any decent service manuals for the 1609. the one i found was all fuzzy when i zoom in. where can i get a copy of this one you have the page from? that would help tremendously! its like trying to shower with all your clothes on with bad documentation!
 
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