Service Manuals and Schematics!

Pulling out your hair? Don't know what to do or where to go? Ask in here.
Forum rules
READ: VSE Board-Wide Rules and Guidelines

If your Help request has been solved, please edit your first post in order to select the Image Topic Icon to let others know your topic has been solved.
Rasputin
Senior Member
Senior Member
Posts: 810
Joined: Thu Jul 21, 2016 4:52 am

Re: Service Manuals and Schematics!

Post by Rasputin » Sat Jul 04, 2020 2:37 pm

The rare and elusive Akai Z4 and Z8 service manual and schematics:
http://www.mediafire.com/file/lduhp0tbm ... l.pdf/file

Sorkin Multivox MX3000 Owners Manual (with schematics):
https://mega.nz/file/sZlzFLRI#VktgG5ot1 ... a8eaHfRKbQ

Kawai R50/R50e Service Manual (with schematics):
https://mega.nz/file/wA0h3SaR#dYLOJD_1P ... Gf0SghJL6w

blueknob
Active Member
Active Member
Posts: 294
Joined: Sun Jul 06, 2008 12:30 pm
Gear: ESi32/E6400U, Novation Supernova, Ensoniq, vintage Macs and the like.
Location: England, UK

Emu E4K

Post by blueknob » Wed Dec 23, 2020 6:59 am

Anyone know if there is a schematic for the Emu E4K. Mine has a warm up issue with the keyboard part, 8 keys don't work but come into life about 20 mins later and then work perfectly. My guess is a bit/line on the keybed contact scanner chip is failing. It would help to know if it's a replaceable chip or some custom device. The former I can replace. A schematic would help me locate the culprit much faster.

User avatar
Yekuku
Active Member
Active Member
Posts: 729
Joined: Tue Nov 18, 2008 11:29 am
Gear: dk'tronics speech synthesizer :P
Location: Greece

Re: Service Manuals and Schematics!

Post by Yekuku » Wed Dec 23, 2020 8:56 am

Hi blueknob, I have uploaded it here :
https://www.sendspace.com/file/8648nc
You can use a hairdryer and a freeze spray to find the culprit.
It is all about sharing...

blueknob
Active Member
Active Member
Posts: 294
Joined: Sun Jul 06, 2008 12:30 pm
Gear: ESi32/E6400U, Novation Supernova, Ensoniq, vintage Macs and the like.
Location: England, UK

Re: Service Manuals and Schematics!

Post by blueknob » Wed Dec 23, 2020 11:46 am

Thanks Mr Y - that's very good of you and sooo fast! :drinks:

Had a quick look.. hmm.. once big chip does it all, more.. hmm.. :geek: at least I now know where to look.

thanks again

User avatar
Yekuku
Active Member
Active Member
Posts: 729
Joined: Tue Nov 18, 2008 11:29 am
Gear: dk'tronics speech synthesizer :P
Location: Greece

Re: Service Manuals and Schematics!

Post by Yekuku » Wed Dec 23, 2020 12:31 pm

You are welcome blueknob!
A few ideas :
1) check/clean/reattach the fatar keyboard connectors. Replace cable if possible.
2) 8 keys mean that 1 bus has the problem. Could it be due to a leaky diode ? Replace diode on the specific bus.
3) The scanner ic looks like a custom EMU ic, thats bad news.
It is all about sharing...

blueknob
Active Member
Active Member
Posts: 294
Joined: Sun Jul 06, 2008 12:30 pm
Gear: ESi32/E6400U, Novation Supernova, Ensoniq, vintage Macs and the like.
Location: England, UK

Re: Service Manuals and Schematics!

Post by blueknob » Fri Dec 25, 2020 4:53 pm

I studied the circuit, got to the K-Chip emu use for keyboard scanning, worked out exactly which bus line (pair - make and break) - took close look for that specific connector and noticed it was slightly skewed (not in 100% on one end) - pushed it in 1mm. So far all working now :) result.

User avatar
Yekuku
Active Member
Active Member
Posts: 729
Joined: Tue Nov 18, 2008 11:29 am
Gear: dk'tronics speech synthesizer :P
Location: Greece

Re: Service Manuals and Schematics!

Post by Yekuku » Fri Dec 25, 2020 6:15 pm

Like a pro ! Good work Blueknob!
It is all about sharing...

Gerrymc2010
Newbie
Newbie
Posts: 2
Joined: Fri Dec 25, 2020 11:49 pm

Re: Service Manuals and Schematics!

Post by Gerrymc2010 » Fri Dec 25, 2020 11:57 pm

I'm looking for the Schematic s for the Jen SM2007.

If anyone still has them could I obtain a copy please.

Many Thankx in advance.

G.M

Gerrymc2010
Newbie
Newbie
Posts: 2
Joined: Fri Dec 25, 2020 11:49 pm

Re: Service Manuals and Schematics!

Post by Gerrymc2010 » Sat Feb 13, 2021 8:54 pm

oryjen wrote:
Tue May 24, 2016 8:11 am
I found my docs about that JEN SM2007.
If you still need it, please tell me, I can send them to you through email.

Anybody about the KORG 900PS service manual?
Hi Orjen.
Do you still have details of the Jen SM2007.
If so could I obtain a copy.

Thanks

G

Post Reply