New Yamaha R-1000 = Silent. No relay click at power-on.

A

audioduder

New Member
Hello friends, I'm new so go easy! (this thread's in the right place?).

Just picked up a beautiful Yamaha R-1000 for 5 bucks at the local thrift, unfortunately, can't get any sound out of it.

Nothing through the headphones either, the safety relay "click" is noticeably absent when powering the unit on. I've done some research on these forums and elsewhere, and it sounds like it could be almost anything power-related. I even tried turning it upside down. (Nothing) Seems that many receivers have this issue, but there's not too much info on how to fix or diagnose the problem. (Bad sign, huh?)

I did open the unit and look around, but nothing obvious jumped out at me. Should I invest in a voltage meter?
 
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Welcome to AK~
You should invest in a decent meter if you plan on making a hobby out of old gear. Find a schematic of your unit, and understand the layout of the power supply and amp section. Then, I would check the outputs for shorts. Make sure the unit has been off and unplugged for a while before you go in there.
 
I even tried turning it upside down
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LOL--I remember that thread.Welcome to AK..If you can, post a photo of the power supply or what may appear to be the power supply area of the circuit board.
 
Thanks for the replies. I am a bit of a noob, but I have done some work on tape decks before, nothing too electrical, but for 5 bucks this was a steal, and I'd be willing to give it a shot at repair. This is what I'm dealing with:

DSC00444.jpg

DSC00443.jpg
 
A real nice sounding piece once you get it repaired.Don't see any obvious "red flags" in the photo's. I'm going to need a schematic to help you out. Maybe "Rob" Merrylander will chime in. He probably has a schematic or a little more insight as to what may be its ailment. It could be just about anything from a bad solder connection to a bad voltage amplifier (that big multi-pin black hybrid chip (STKxxxx)) mounted on that heatsink or a shorted output device.
 
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yeah, the fuse looks good. I figured it wouldn't be simple, but I want this one to work so bad! I'll be looking for a schematic.
 
Does it have preamp to amp jumpers? Should be some "U" shape metal
connecters on the back I believe the R-1000 is suppose to have them.

Running from preout-to main or something along that line. If it doesn't have them just use some interconnects to connect them and see if it works after that.
 
Someone has been in thhere before and added extra heatsink to the voltage amplifier. Does the front panel light up where it shows the station frequency. If not there is a 1 amp fuse down in the front of the power supply that may be blown.

If the front does light up power down and wai about 10 minutes then remove the six pin plug and two pin plugs that lead to the output amps mounted on the big black heatsink. Power up and listen for the relay click (small black box near the rear) if it clicks power off.

If the above happens it is likely that you have blown outputs in one of the power amps or maybe even both. New Sankens are avaiable if that is the case. An email to parts@yamaha.com might get a copy of the service manual or at least the schematic.
 
Thanks for the replies, i had already tried connecting the jumpers with standard audio cables (there are no pins), still nothing.

merrylander- also tried unplugging the connectors, still no click! The front panel lights up and the tuner works, just no sound.
 
schematic.jpg


Here is the block diagram I found in the R-1000 manual. It's like a foreign language to me, but I guess it's a start. Not sure if this is readable in the format I posted it in, but I have the pdf.
 
Well, here's a new question:

Supposing I can't fix this receiver on my own, would you still recommend this model? I am currently using a technics su-v98, which pales in comparison to the features/options on the Yamaha (also why I was excited to find it).

In short: If I'm in the market for a new receiver, should I look into this and similar Yamaha models? I'm looking for an 80s model. I would mainly use it for cassettes and LPs. I'm into nice tape decks. I can't afford to spend over a couple hundred dollars on eBay though...
 
it seems like having this repaired in a shop would cost as much as a new one, am I right? If the repair is beyond me (looks that way) I may as well find a new one.
 
audioduder said:
it seems like having this repaired in a shop would cost as much as a new one, am I right? If the repair is beyond me (looks that way) I may as well find a new one.
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I may as well find a new one
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That may or may not need something else repaired. Thats the vintage way my friend.
 
I think you'll need a multimeter and start measuring around. I had a similar problem with my akai once and found it was a cold solder joint on the transistor that activates the relay. I know it may sound a bit unorthodox bit how about trying to connect some cheap speakers to the 'source' terminals on the relay to see if both channels work?
 
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