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Kenwood VR-507 Receiver Starts Clicking at Random and Audio Cuts Off

Ive had this receiver for like forever. Recently, it started doing this clicking thing. It clearly sounds like some kind of relay and seems to happen at random. Some times it goes for 4 - 5 hours (after turning it on) w/o happening and other times its after only 10 minutes.

Some times it click 6 - 8 times a second for a couple seconds and other times its maybe once a second for 5 mins. The audio cuts out while this is happening.

I first thought it might be a heat issue, so I blew the thing out and stuck a fan blowing on it. This changed nothing.

Interestingly enough though, I realized its the SPDIF In audio that cuts out. When using the analog input on the front, the audio doesnt drop. But the clicking is quite loud anyway.

Anyone have any diagnostic/repair suggestions?

Thanks!

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Answer this question I have this problem too

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@ahhk could just be a shadow situation but check the components between the two ribbon cables in picture number 5. Looks like some discoloration going on there.

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Yeah, I saw that as well. But like the two patches near the center of photo #2, I think it is just some odd discoloration as none of the local components show any visual signs of heat damage and the solder points all look solid. I havent removed any of them to test, though.

Is it possible that this could just be a faulty relay - instead of bad cap or whatever is triggering the relay?

I havent been able to pinpoint which relay it is yet since its now being a PITA and only doing its thing when I'm out of the room. But, Im pretty sure its either K1 or K2 (photo #2). I was going to try to clean it up, but they dont seem to have a removable cover like many do (unless the latches are on the bottom?)

And since K1 seems to control the primary speakers, is it possible that this could be caused by a (speaker) load issue? Guess I'll verify each line is 8 ohm.

Im far from being an expert so Im just guessing here :0

I'll add a closeup of the relays.

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2 Answers

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@ahhk could be the speaker relay that does the clicking. We would need to see more from your receiver. Post some good pictures of the boards etc. so we can see what you see. Of course, check for obviously damaged components (charred, lost,etc.,) Since it only happens with SPDIF I would check the audio decoder IC first. IT is located on the X08-3060-10 (J70-1459-32) board (the one with the digital in ports).

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Photos added! Now that I have the cover off, I'm waiting for the clicking to start so I can see which relay it is. Will update when I know. Thanks!!

I THINK the last photo is the audio decoder as it is labeled as a codec in the SM.

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Hi @ahhk ,

Bit confused when you say that it doesn’t happen on analogue audio but the clicking is quite loud. Presumably the relay is still operating but not affecting the audio is this correct?

Here’s a link to the service manual for the receiver. (it also covers the VR-507).

On p.5 it shows that the receiver has 3 protection circuits. Thermal, over voltage and over current. You may have to work out which protection circuit is the one causing the relay to operate. The manual has the circuits (see p.16/35 when viewed in PDF viewer) to find the protection circuit.

Hopefully this will be of some help.

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Yes.

When using the optical input, the audio cuts off while it clicks.

When using the (front) analog input, the audio does NOT cut off while it clicks.

I know that is strange, since the relay click sounds exactly like the amp circuit being turned on/off.

Thanks!

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Ahhk will be eternally grateful.
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