Vintage Stereo Receiver Repair - Chicagoland Sportbikes
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post #1 of 37 (permalink) Old 03-08-2012, 07:14 PM Thread Starter
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Vintage Stereo Receiver Repair

Hi,

I have an 80's era top of the line JVC receiver (R-X400). It's been in storage (climate controlled) for years. It was working fine before I stored it but now not so good. When I power it on, you hear a click and the LCD ligths very dimly but not actually showing a display and nothing else works. I opened it up an checked the fuses and they seem fine...I also blew off the dust and spayed some electrical contact cleaner....no luck.

I have a pretty nice system (EQ, tape deck, speakers) all from the same era so it would be cool to have a matching receiver...and this was a very nice sounding receiver/amp.

Any recommendations on a place to have it checked out? I've been asking around but haven't found anyplace. I'm in South burbs but willing to travel if not too far.

Thanks

- Frank
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post #2 of 37 (permalink) Old 03-08-2012, 07:28 PM
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first thing i would check is to see if you have any capacitors that have blown. You can see videos what they look like on youtube.


Just make sure when you are playing around, you disconnect it. and look out for high voltage capacitors because they can still hold a charge.
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post #3 of 37 (permalink) Old 03-08-2012, 07:58 PM
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post #4 of 37 (permalink) Old 03-08-2012, 08:55 PM
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I have to be honest with you. A new receiver even one for just a few hundred dollars will probably sound better and in the long run cost you less. There are threads on here that discuss replacement gear and include some websites that sell factory re-certified equipment at great prices.
http://accessories4less.com/

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post #5 of 37 (permalink) Old 03-08-2012, 10:34 PM Thread Starter
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Thanks for the advice. Yeah, I've seen some pretty good deals on new receivers online but thought it would have been kind of cool in a vintage/nostalgic way to have to old setup from my youth rockin' again.

I'll take a closer look at it myself again and beware of those potentially charged capacitors....I had no clue. If I can't figure anything out I'll consult Electronic Engineers if I can't find someplace closer....if all else fails I'll have to go modern (having a remote would be nice).

- Frank
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post #6 of 37 (permalink) Old 03-08-2012, 10:47 PM
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post #7 of 37 (permalink) Old 03-09-2012, 07:00 AM
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Technical Specifications for audio equipment have not changed that much over the years with regards to sound quality.

If your old amp was working to original specifications .... it would sound about as good as anything modern that was roughly equivalent power / quality wise.


That said ..... a lot of progress has been made on power circuits so odds are good that a newer amp would have more power.

There are also features like Dolby, DTS and newer sound formats that require decoding that are supported by newer AV / Surround receivers.

Speakers on the other hand have come a long long way .....



I still have a very old Technics Receiver ..... don't use it much as I listen to newer tech stuff....

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post #8 of 37 (permalink) Old 03-09-2012, 07:13 AM
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Sadly I agree with TDS on this one. You've already checked the fuses, then check the capacitors and watch for voltages. Large caps can stop your heart!

After that, it's just taking it into a shop.

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post #9 of 37 (permalink) Old 03-09-2012, 09:22 AM

 
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There is a place Elk Grove, I think it's on Thorndale, just West of Wooddale Rd.

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post #10 of 37 (permalink) Old 03-09-2012, 10:25 AM
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the older it is the easier it should be to diagnose
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post #11 of 37 (permalink) Old 03-09-2012, 11:16 AM
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Quote:
Originally Posted by elroy121 View Post
the older it is the easier it should be to diagnose

Indeed ...and this sounds like a power issue .... which should be real straight forward.


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post #12 of 37 (permalink) Old 03-09-2012, 12:53 PM Thread Starter
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Thinking this here might be the problem....what do you think? This isn't one of those 'heart stopper' capacitors is it?
Attached Images
File Type: jpg JVC_capacitor.jpg (65.2 KB, 27 views)

- Frank
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post #13 of 37 (permalink) Old 03-09-2012, 01:51 PM
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If you are in the City, call these guys:

Saturday Audio Exchange‎
1021 West Belmont Avenue
Chicago, IL 60657
(773) 935-4434

They will know someone if they don't do it themselves. Anybody else in the city into Audio should check out this shop, small and unassuming, but they know their stuff and have really great prices on mid to high end components. A lot of scratch and dent high end stuff too.
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post #14 of 37 (permalink) Old 03-09-2012, 01:56 PM
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Quote:
Originally Posted by chicagoavatar View Post
Thinking this here might be the problem....what do you think? This isn't one of those 'heart stopper' capacitors is it?

Correct and yes it is.


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post #15 of 37 (permalink) Old 03-09-2012, 01:56 PM Thread Starter
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Quote:
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If you are in the City, call these guys:
...
Not in the city any longer and this is just another reason I should have never moved! (not adjusting well to the quite burb living ). Anyway, you should still buy my GPR stabilizer, gear indicator and Attack Race plactics ....I'm going to list this stuff and more soon (now it's not all buried in the back of a storage unit).

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post #16 of 37 (permalink) Old 03-09-2012, 02:23 PM
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Quote:
Originally Posted by chicagoavatar View Post
Thinking this here might be the problem....what do you think? This isn't one of those 'heart stopper' capacitors is it?
This looks pretty close to that capacitor that's burned up. You'll probably want to replace the diode to the right of it as well, though I can't tell what it is from the photo.

http://www.google.com/products/catal...d=0CI4BEPMCMAU

Fry's stocks a decent amount of basic components and may have that in stock. Radio Shack might have it as well. It's going to be a PITA to get under there to de-solder the cap though, might want to still take it to a shop if you really want to save it. Expect to pay more than the receiver would sell for to repair it though.

Looking at the resistors in your photo, it looks like they used some decent components.

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post #17 of 37 (permalink) Old 03-09-2012, 03:11 PM Thread Starter
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Thanks....it looks like the board the capacitor is on can be pretty easily removed. How can I safely discharge the capacitor? (don't want to get shocked....I had no clue this danger existed, should have paid more attention in physics class I guess). I might try fixing it myself otherwise would probably be better off just getting a nice new (or refurb) receiver to replace my also very old one that is used with my T.V. and BluRay and using that one with this old system.

- Frank
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post #18 of 37 (permalink) Old 03-09-2012, 03:37 PM
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you can take a test lead and do one side of the terminal and touch the other to a "ground" or a water pipe(should be grounded)


Mouser has capaciters for really cheap, about 50 cents. You just look at the voltage and the amount of charge it holds. then they go by size etc...
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post #19 of 37 (permalink) Old 03-09-2012, 03:46 PM
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can't find anything on capacitors but heres one for doing a TV, same theory


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post #20 of 37 (permalink) Old 03-09-2012, 04:02 PM
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you would need a fairly big cap to do any harm, what raven is referring to is common in TUBE amps that run about 350-500 Vdc in the power section, that kind of voltage is deadly, you can survive shock from lower voltage and really high voltage like lightning has a clampdown effect on your heart and somehow its possible to survive that, but that inbetween voltage range is known to be especially deadly
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post #21 of 37 (permalink) Old 03-09-2012, 04:04 PM
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if you are worried about any cap, use a resistor to bridge the leads and de-energize it
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post #22 of 37 (permalink) Old 03-09-2012, 04:07 PM
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If you find the cap, must be exact, I can solder it for you.

To discharge the board just run a screwdriver across the Back ..... Unplugged of course.

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post #23 of 37 (permalink) Old 03-09-2012, 04:11 PM
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Quote:
Originally Posted by chicagoavatar View Post
Thinking this here might be the problem....what do you think? This isn't one of those 'heart stopper' capacitors is it?
35v wont hurt you
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post #24 of 37 (permalink) Old 03-09-2012, 04:12 PM
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Quote:
Originally Posted by elroy121 View Post
you would need a fairly big cap to do any harm, what raven is referring to is common in TUBE amps that run about 350-500 Vdc in the power section, that kind of voltage is deadly, you can survive shock from lower voltage and really high voltage like lightning has a clampdown effect on your heart and somehow its possible to survive that, but that inbetween voltage range is known to be especially deadly


Most people, but you gotta play it safe and assume not all people can handle a shock and that it can cause them to have a heart attack.
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post #25 of 37 (permalink) Old 03-09-2012, 04:15 PM
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It's not just the voltage ......it's the current which is all released at once.......


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post #26 of 37 (permalink) Old 03-09-2012, 05:32 PM Thread Starter
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Thanks again for all the input.

Do you think I need a "audio" specific type of capacitor or will pretty much any off the shelf 1000uF 35V capacitor do?

- Frank
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post #27 of 37 (permalink) Old 03-09-2012, 05:52 PM
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Just match the spec ....

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post #28 of 37 (permalink) Old 03-09-2012, 05:59 PM
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^^^ Agreed. This is probably a cap used to smooth the power going to some part of the amp. Doesn't effect tone really like a cap in a speaker crossover would.

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post #29 of 37 (permalink) Old 03-09-2012, 06:02 PM
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Exactly .... Probably the power supply ... Pretty generic stuff.

Tom

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post #30 of 37 (permalink) Old 03-11-2012, 11:03 AM Thread Starter
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Picked up a capacitor at Radio Shack for $1.79....the days of the middle aged nerd Radio Shack employee is gone, the associate helping me is more likely a hip hop DJ instead of an electronics hobbyist (I got the feeling he, despite working at Radio Shack, had little clue what a capacitor is). Looks like a good match on specs so next challenge is getting the board out, old one discharged and removed (not shocking self or breaking anything in process) and getting the new one properly installed. Buddy of mine does a lot of soldering on guitars he builds/repairs so I'm going to get some help from him. I'll be pretty happy if this fixes it (cheap $$), if not I'll probably junk it and order something new.

Thanks again for all the advice....I'll update post later

- Frank
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