Sony Ps-x75 Important notice re Main MicroProcessor MB8841-2

[brinsmeads]

If you own a Sony PS-x75 and PS-x65 turntable that doesn’t respond to the push buttons and there is no motor function and power supply voltages are within tolerances

There is a good chance that the 4bit Fujitsu micro processor,
MB8841-209L is faulty. Original Sony Part No…….8.759.982.09
This original Sony encoded IC ( Fujitsu was discontinued in the late 80’s )

Sony advised that in 1991 substitution handbook that this IC was to be replaced
With: Fujitsu……….
MB8841-327L……….. Replacement Sony Part No……….8.759.983.27

There are a number of these for sale in GB on ebay at this time
These micro processors do have a high failure rate and many Sony PS-x75 and
Sony PS-x65 have been dismantled for components because of these
IC’s being unavailable.

[brinsmeads]

Also absent in the display will be the word ‘Locked’
And ‘33’ will not change

[Topherbarrow]

Hey Guys,

My name is Topher and I am new to turntables, but have been interested in them for a while. I have recently been given a PS-X75 , but it has this exact issue.

My question is....if I get my hands on this replacement part, how difficult is it to replace?

Any help is greatly appreciated!!

Thanks,
Topher

[Cobra2]

IC: MB8841-327
http://www.dalbani.co.uk/catalogue/prod ... p?id=19750

Arne K

[brinsmeads]

Not a difficult job to do, it's a 42pin IC
To unsolder, follow safety precautions in Sony PS-x75 service manual

[brinsmeads]

USA owners of Sony PS-x75
Sears, also do appear to have stock of the MB8841-327 IC albeit costly at $79

[brinsmeads]

I toyed with the putting a 42 Pin DIL IC socket with gold plated contacts on to the PS-x75 main PCB.
If you felt uncomfortable soldering the MB8841-327 IC directly to the PS-x75 main PCB this may be worth considering

[brinsmeads]

42 pin ic socket.jpg

(28 KiB) Downloaded 5526 times

[mallikh67]

hi

i have this ttable and looking for the mb8841327 ic but invain.any one can lead

me where to get this ic

[brinsmeads]

Try Dalbani UK as suggested by Arne, and Sears USA on Line Sales for sterters

[twhtalm]

Sears is no longer carrying the MB8841-327, found out the hard way by getting a refund. Tried to contact Dalbani and have not heard anything, doubtful that they have this IC anymore. Does anyone have any other leads? Sounds like there are a handful of tables on here besides mine that need this repair.

[brinsmeads]

MB8841-327 Fujitsu IC - For PS-X75, PS-X65, PS-X65C - Sony Part # 8-759-983-27 See original listing


Item condition:New
Ended: Nov 27, 2013 13:18:13 PST
Price: US $39.99
Shipping:
Item location:Camarillo, California, United States
Seller:
wi5connect (340 ) | Seller's other items

[mallikh67]

hi

i am also looking desperately for this ic and sears doesnt have in stock

and the given ebay member also doesnt have in stock. any other genuine source to

grab this ic

[Cobra2]

WANTED: one chip...
reward $ 100

Arne K
NORWAY
(or please help buying this; http://www.searspartsdirect.com/partsdi ... 528&blt=04 -and ship overseas to me)

[twhtalm]

Reviewing the service manual I discovered that the MB8841 doesn't do much more than sequence all of the individual operations. Because of this I have decided to use a Teensy++ 2.0 to see if I can replicate the operation of the table. If I am able to do so I have line of sight of a modern direct replacement for the MB8841, which the developer has offered to adapt my program for his hardware. If this works and there are enough people we're looking at under $60 for the direct replacement. Hardware for testing is on the way so it will be 2-3 weeks before I can give you guys an update.