Service Manuals and Schematics!

[Rasputin]

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]

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.

[Yekuku]

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.

[blueknob]

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

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

thanks again

[Yekuku]

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.

[blueknob]

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.

[Yekuku]

Like a pro ! Good work Blueknob!

[Gerrymc2010]

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