JVC HR-S6700U
- Thread starter mr_rye89
- Start date
- Joined
- Nov 1, 2014
- Messages
- 3,493
- Location
- Gaston, SC
- Tagline
- Victim of the record bug since age five
More progress! The guides are okay. But there's another nasty SMD 3.3 uf 50v capacitor on the bottom of the head drum that is junk. Couldn't get this to track any tape for shit. Swapped out now we're good. This works for many JVC VCRs of this vintage. All the info in this thread is found on YouTube. Now to fix the no HiFi audio on the left channel problem.....
- Joined
- Nov 1, 2014
- Messages
- 3,493
- Location
- Gaston, SC
- Tagline
- Victim of the record bug since age five
Everything inside was really pretty clean. It's basically 98% functional. Just the left channel audio being low and distorted. If tested a bunch of capacitors and they all check out, and the broken trace jumpers all ohm out too, so I don't know what's up. I may need a parts unit. I may see about getting a service manual to see how audio is routed/processed
interesting thread, thanks for sharing!
some of what you show here might be useful to get some hints to fix my JVC HR-S4700EG which has the power supply which is totally gone, after some capacitors leaked some brown crap and messed it totally (in fact, I am tempted to replace quite everything on it!)
And before getting the power supply problem, I had experienced issues on HiFi audio which might depend on the dying power supply or also by those SMD caps you mentioned... must definitely check those, too.
some of what you show here might be useful to get some hints to fix my JVC HR-S4700EG which has the power supply which is totally gone, after some capacitors leaked some brown crap and messed it totally (in fact, I am tempted to replace quite everything on it!)
And before getting the power supply problem, I had experienced issues on HiFi audio which might depend on the dying power supply or also by those SMD caps you mentioned... must definitely check those, too.
is that one the actual audio board? mine has it and, looking at the inside, that 6700 looks a lot like my 4700... maybe the basic design is the same and they share a lot of things?
regarding the power supply....
years ago, when I started experiencing issues on HiFi Audio, I had tried to replace the audio CMOS switches chips but nothing changed then I did put it aside...
and trying it again a couple months ago, it was totally dead... then I removed the whole power supply (that metal box above the mechanism) and I tested a couple capacitors (i.e. the 100uF 400V one) and they were dead... also, the bigger brown ELNA capacitors leaked a lot of brown crap which corroded some tracks and, also, that crap seems to also be somewhat conductive.
While trying to check/troubleshoot it after replacing the capacitors, surely something else got broken then I fear I'd need to replace quite some parts.
At the moment, the power supply is still outside the VCR and waiting for the tricky and long work needed to fix it... let's see how it goes.
I am tempted to buy one of those small component tester devices, to be able to check more parts.
Anyways, If yours powers up correctly, I would immediately recap the power supply before risking that those ELNA leak that crap and make a lot of damage... I mean all electrolytic caps in the power supply should be replaced as soon as possible.
regarding the power supply....
years ago, when I started experiencing issues on HiFi Audio, I had tried to replace the audio CMOS switches chips but nothing changed then I did put it aside...
and trying it again a couple months ago, it was totally dead... then I removed the whole power supply (that metal box above the mechanism) and I tested a couple capacitors (i.e. the 100uF 400V one) and they were dead... also, the bigger brown ELNA capacitors leaked a lot of brown crap which corroded some tracks and, also, that crap seems to also be somewhat conductive.
While trying to check/troubleshoot it after replacing the capacitors, surely something else got broken then I fear I'd need to replace quite some parts.
At the moment, the power supply is still outside the VCR and waiting for the tricky and long work needed to fix it... let's see how it goes.
I am tempted to buy one of those small component tester devices, to be able to check more parts.
Anyways, If yours powers up correctly, I would immediately recap the power supply before risking that those ELNA leak that crap and make a lot of damage... I mean all electrolytic caps in the power supply should be replaced as soon as possible.
