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FenderBender
Copper Member
Thailand
13 Posts |
 Posted - 01/17/2009 : 09:40:04
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I have a Yamaha APX-6 that I hadn't used for a few years and when I dug it out and plugged it in there was no sound. I also heard a rattle inside the body and it turned out to be a capacitor.
I took it into Yamaha service to have it repaired and after a few weeks I went back to see what was taking so long. They told me that the circuit board was bad and Yamaha doesn't make them any more. That's IT! Throw it out and buy a new one! Can you believe this?
Imagine if Fender or Gibson said I'm sorry we stopped making parts; just buy a new one. Any one considering buying a Yamaha might contemplate my experience before making a purchase.
This is the same guitar David Gilmore used on the Pulse album and video. Imagine Yamaha telling David Gilmore "I'm sorry that guitar is dead; buy a new one"?
Anyway...Does anyone know where I can get replacement parts or a schematics so I can try and fix it myself? I have no intention of just throwing it out and certainly wouldn't replace it with a newer  Yamaha. |
Edited by - Dr. Bob on 01/17/2009 10:09:10 |
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Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 01/17/2009 : 10:03:40
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Hi FenderBender
I'm not familiar with that electro-acoustic model, but heck, it's just a guitar, with a piezo & pre-amp?
Please post some pictures of the affected area, & what's left of the cap.
Does the cap still have leads on it?
You might just be able to replace the cap or resolder it.
You may not need the schematics.
By The Way (BTW),
because you are a new member here, I have to ask you;
Can you solder, and do you have a soldering iron, multimeter & the tools, and skills to repair it, if we try to help you out.?
Regards Dr. Bob
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Edited by - Dr. Bob on 01/17/2009 10:05:16 |
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FenderBender
Copper Member
Thailand
13 Posts |
Posted - 01/17/2009 : 14:23:23
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Hey Doc!
I've got a soldering iron but not all the necessary gadgetry to go along with it. I've been reading up on some of the soldering web sites to try and get up to speed. I'm OK with cables and such but I'm a little intimidated when it comes to circuit boards. I should probably practice a bit first before I take the plunge.
Any help would be appreciated. I found a Thai guy that does a pretty good job; he's currently replacing all the caps on my Zoom 9002. Remember those? I'm trying to revive it just for the digital reverb and the 2 digital delay's; but for vocals not guitar.
I'm currently out of work right now and the Thai government doesn't provide unemployment insurrance for non-immigrant's (gee, I wounder why?), so I'm thinking of doing a one-man show gig for a while until I find a job.
I've actually got a gig, but I just need to get about 40 tunes together first. My vocals suck as well so I might need more vocal effect than Prince uses just to sound acceptable.
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Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 01/17/2009 : 14:36:40
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Hi FenderBender
Please take some pictures, as I suggest in my previous post.
We'll be able to see if we can help you out, fixing your Yamaha.
Regards Dr. Bob |
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FenderBender
Copper Member
Thailand
13 Posts |
Posted - 01/17/2009 : 15:02:09
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Hey Doc,
Actually I left it with a Thai guitar tech named Zak. He's got a bunch of photo's on the wall showing him with other famous people, so I'm thinking he might actually know what he's doing.
He's going to give me the low-down on monday. If he can't fix it I'll try to provide some photos.
Thanks for the assistance.
I'm not sure how to even dismantle the thing if it comes down to that. I'm usually fairly good at taking things apart; unfortunately I'm not quite as good at putting them back together. |
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FenderBender
Copper Member
Thailand
13 Posts |
Posted - 01/25/2009 : 15:58:47
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Well I finally got my Yamaha back and the Thai guy couldn't fix it either, so now I'm stuck with a real nice piece of lumber with Yamaha on it. Here's a photo:
I'm testing to see if I can get the image in the post. Sorry if it doesn't work. |
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FenderBender
Copper Member
Thailand
13 Posts |
Posted - 01/25/2009 : 16:08:51
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Well that didn't work so I guess I'll just have to attach them.
Here's the Guitar:
Download Attachment:  YamahaPreAmp_00.jpg
51.95�KB
Image display code added by moderator.
Here are some photos of the pre-amp dissasembled:
Download Attachment: YamahaPreAmp_01.jpg
69.86�KB
Download Attachment: YamahaPreAmp_02.jpg
42.07�KB
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Edited by - Dr. Bob on 01/25/2009 16:47:59 |
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FenderBender
Copper Member
Thailand
13 Posts |
Posted - 01/25/2009 : 16:28:39
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Well that sucked as well. I'll try the guitar again:
Download Attachment: YamahaPreAmp_00b.jpg
52.34�KB
above image already displayed in previous post- Moderator.
I think this is the board that's creating the problem. The other boards just seem to be pots for volume, treble, bass and mix.
Download Attachment: YamahaPreAmp_04.jpg
24.33�KB
Image display code added by moderator.
One side of the board is chockerblock with caps and the other side has a couple IC's (062 3012B JRC) and very little components bridging the caps with numbers on them which are so small that you need a magnifying glass to read them (101, 102, etc..). There's also what appears to be a very small IC or transistor with YL or something like that.
I presume this is the actual pre-amp because it's the busiest of the four.
Any idea's would be greatly appreciated. I really like this guitar and it would be a shame for it to remain dead.
Cheers!
PS - where do you find out how to place photos in a post? I checked the FAQs but that didn't help. |
Edited by - Dr. Bob on 01/25/2009 16:50:27 |
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Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 01/25/2009 : 16:57:48
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Hi FenderBender
quote:
PS - where do you find out how to place photos in a post? I checked the FAQs but that didn't help.
Click on edit, on any of the above posts, & you will see the HTML display code.
Because it's display code, it will no display as normal text in a post.
Copy this code & pate it into a notepad/word document, for easy future reference.
JUST CHANGE THE FILE NAME.jpg
Note: your images are also a bit to large for the forum's width.
Please resized them before you upload any future pics.
The instruction for uploading pics is here in the FAQ's,
it's a sticky & always stays at the top of the list.
http://www.bossarea.com/forum/topic.asp?TOPIC_ID=4015
Does your camera have a macro-closeup setting?
Some of your pics are very out of focus.
Regards Dr. Bob |
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FenderBender
Copper Member
Thailand
13 Posts |
Posted - 01/26/2009 : 05:52:38
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Hi Doc,
I downloaded my camera manual to find the macro mode so these photos should be better than the previous ones.
Thanks for the sticky link; I guess I almost had it the first time.
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Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 01/26/2009 : 06:58:17
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Hi FenderBender
PLEASE RE-SIZE your pictures, before uploading them to the forum.
Regarding your problem with the APX-6 pre-amp.
Have you considered that the Piezo pickup may be damaged?
These can be very fragile, if mishandled - bent.
You will need a Scope (CRO) to really see if it's working.
What test equipment do you have, or have access to?
As Laurie, cctsim, myself & others have mentioned many times,
you really do need the proper test equipment to do some of these repairs and setups.
Like setting-resetting the proper working conditions on the DM-2-3, BF-2-3, CE-2-3.
Sometimes you can't just fluke it by ear.
And there will be times that we just can't help you, no matter how much we want to, or try to.
See if Yamaha will be kind enough to send you a Schematic for this out of production unit.
Or else see if there is a Yamaha support group/site that has it, or is able to help you out more than we are able to.
Regards Dr. Bob
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Edited by - Dr. Bob on 01/26/2009 07:36:19 |
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Topic |
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Yamaha APX-6 electro-acoustic - no sound
YamahaPreAmp_00b.jpg