MPC 4000 Crashing - Replacement Motherboard not available?

The following is a description of the MPC's problem, taken from some correspondence I had with Akai Pro.

I have tried removing all Ram, Hard Drive, Adat card, Cd Drive and USB, no change. The unit powers up alternating between Blank screen and temporary boot, then crashes, returning to a similar error message.
I did notice that sometimes when I get a blank startup screen, with the HD is installed, it (HD) does not engage / power up.
The problem seems to be intermittent, although primarily in error. I did manage to get the unit to boot up temporarily and after crashing when trying to load OS Via PC,
I managed to RE - Load / Flash OS using the front USB port. Unit Ran For approximately 30mins, then returned to Error message.

With no other devices / RAM installed the unit temporarily boots, although (no matter which top panel controls I press, pads, scroll, functions etc) I still get the following errors after a couple of minutes:

Boot block exception
UNDEF at 0x430
FSR 0xC0005003
FAR 0x62D499

Fat'l Error "D'ta @bort"
[ID: 00000002, I:00148404\]
[FRR: B0004005, FAR: F83E3846]

Boot block exception
IABORT at 0x301DB410
FSR 0xC0005201
FAR 0x17FFF9EF

+ other Boot block / Fatal Error! variations.

Unfortunately I have been told by Australian repairer that they cannot touch my unit as I bought it second hand from the US?

Akai have given me a copy of the Service Manual, through reading, it has lead me to determine that the error is with the EPROM, on the motherboard.

I cannot find any replacement motherboards (that aren't defective) anywhere? Please Help!

Thanks again for your help, much appreciated!

Having same problem... Sending my 4000 to vst tomorrow... Its under warranty so I'm all set... Spoke to rep and they had a couple with same problem... I let you know how I make out in a couple of weeks...

"We do have the LCD screen in stock for $245, and the jog wheel
encoder (the internal part) in stock for $59.00, but unfortunately the main
board is no longer available."
from Vstservice.com
this is (like we say in italy) a bad story.............

VST Service US, can try reflashing EPROM using 'special Jig' . Hopefully this works.
Will let you know how it goes.
P

So what was your story guys? I've been having the same problems and took it to service, they reflashed the eprom, changed some capacitors but nothing **** worked

Give Forat a try he a genius when it comes to MPC's..

Try powering on the unit without the ram. I had a similar "Fatal error" issue. I would get a frozen screen upon boot up. I had to replace the PCB board with the memory slots. Extremely rare. See if you can get a parts machine with a working board. I also hear the effects board can also be faulty.

Von: thanks, but I am from Europe. Any MPC4000 service specialists from EU?

kevtech: thanks but I already tried all this to no avail and ufortunately a replacement mobo ain't available anymore, can't even be find used Strange thing is that sometimes (after about a bunch of turn off/ons) it finally powers up properly and when it does, it works without a prob but this miracle happens only about once per week or something

This guys a member here and very clued up.Based in the uk!!!!

https://www.facebook.com/pages/Jazzcats ... 9503294538

perhaps a power supply failure. if there's short voltage drops it can cause such erors. like blue screen under windows