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

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brinsmeads
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Re: Sony Ps-x75 Important notice re Main MicroProcessor MB88

Post by brinsmeads » 21 Jun 2018 00:48

Sony XL45 ;MM

If you can get your hands on one of these, buy it for your Sony, they a great sounding cartridge, very very detailed sound, exceptional upper register response.
Just be sure its the original stylus ND45X in good condition or Jico replacement

Picture illustrates,the front of the original stylus will show you what to look for.
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Sony XL45 with Original ND45X Shibita Stylus.jpg
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langer

Re: Sony Ps-x75 Important notice re Main MicroProcessor MB88

Post by langer » 15 Jul 2018 20:37

Congratulation.

This system is getting harder and harder to get, getting more and more expensive, even more difficult with NOS needles and when the needles are mostly broken.
Would be glad to get a good body here. Luckily, there are still needles from Jico ...

brinsmeads
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Re: Sony Ps-x75 Important notice re Main MicroProcessor MB88

Post by brinsmeads » 25 Jul 2018 01:58

Thankyou langer, a bit difficult cartridge / stylus combo to find but abide your time, they turn up, the original Shibita stylus supplied with this cartridge, is the secret, to information retrieval from the record.

Theres plenty of info on the net about these stylus and their tip surface area to study.( go to the Jico Website)

Jico offer the ND45x. Stylus for the XL45 cartridge for international orders ( that has the Shibita Tip) on their English Website

When I looked at the Japanese Jico Website they appear to offer the a Sony replacement stylus for the XL45 in their premier SAS Stylus (S.A.S SUPER ANALOGUE STYLUS) but it doesn’t appear for export.

Do any of you guys know more on this ?

lherbal
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Re: Sony Ps-x75 Important notice re Main MicroProcessor MB8841-2

Post by lherbal » 15 Nov 2018 03:43

I know this post is a few years after the original posting but I wanted to know if anyone has attempted to use a Fujitsu IC MB8841H for this processor OR if there are any more suggestions on a current source for this IC.

brinsmeads
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Re: Sony Ps-x75 Important notice re Main MicroProcessor MB8841-2

Post by brinsmeads » 29 Nov 2018 23:42

lherbal wrote:
15 Nov 2018 03:43
I know this post is a few years after the original posting but I wanted to know if anyone has attempted to use a Fujitsu IC MB8841H for this processor OR if there are any more suggestions on a current source for this IC.
Hi herbal, .........the MB8841 (4bit) is for that series of micros......I explained in a previous post, it has to have the gate sequence of MB8841-209. or MB8841-327.

Its the 'Sony' 209 or 327. encoded gate sequence that the important variant.

brinsmeads
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Re: Sony Ps-x75 Important notice re Main MicroProcessor MB8841-2

Post by brinsmeads » 08 Dec 2018 01:22

Sony Single Sheet Inlay in Owners Manual
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lherbal
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Re: Sony Ps-x75 Important notice re Main MicroProcessor MB8841-2

Post by lherbal » 08 Dec 2018 16:51

Rob,
Thanks for sharing your experience and insights on the PS-X75.
I love this turntable and want to do whatever I can to get it working again.
Is it possible for a neophyte like me to get a Fujitsu processor and program for the proper gate codes?
I saw that another member was playing with this but there was no resolution.
At the end of the day, I would like to find a source for the micro-processor.
Thanks,
Herb

brinsmeads
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Re: Sony Ps-x75 Important notice re Main MicroProcessor MB8841-2

Post by brinsmeads » 09 Dec 2018 06:41

Hi Herb, the ROM instructions for these MB8841-(327 or 209) micro’s are a once only write at manufacture.

I was very encouraged by the programming in earlier posts but looks like its dropped off, your best option Herb
at this point is to get a x65 or x75 (dismantling for parts) and change the complete PCB with micro in place. That has the added benefit of keeping heat and static away when changing the ageing micros.

As long as the screen display says “Locked” on the donor unit you’re in there with a pretty good chance of getting it going again.

lherbal
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Re: Sony Ps-x75 Important notice re Main MicroProcessor MB8841-2

Post by lherbal » 15 Dec 2018 22:59

Hi Rob, perhaps you can help me do some troubleshooting. I have two PS-X75 tables and both have a display that says "locked" so that's the good news. I disassembled the unit to clean out the grease per your earlier instructions. When I reassembled, the tower light stopped working and the motor seizes and slightly moves left and right when the power is turned on. When power is off, the motor spindle moves freely but again, when turned on, it seizes. I made no other changes and the tower light and motor were working fine before the cleaning process. Any suggestions or thoughts would be appreciated!

brinsmeads
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Re: Sony Ps-x75 Important notice re Main MicroProcessor MB8841-2

Post by brinsmeads » 19 Dec 2018 02:45

for starter…The size detection light PL501 is thru a 47ohm safety resistor of the -15v line from Q106 volt. Reg.
Is the -15v line , ok?
No wires off or breaks ?
Compare with the other PS-x75

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

Post by brinsmeads » 19 Dec 2018 02:50

The Sony CX193 Comparator in the Servo Amp circuit is a very hard IC to source. (for Speed related Issues)

these have been spotted on eBay.com
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Re: Sony Ps-x75 Important notice re Main MicroProcessor MB8841-2

Post by brinsmeads » 25 Dec 2018 01:33

Taken from the PS-x65 manual exploded view........access to the cam is exactly the same on the PS-x75......this may be a further help
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2 Cam Coil Removal.jpg
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brinsmeads
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Re: Sony Ps-x75 Important notice re Main MicroProcessor MB8841-2

Post by brinsmeads » 09 May 2019 21:52

SH155 headshell comprising of Sony SH155 headshell and Sony MM Cartridge XL45A Boxed Set
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mkoerner
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Re: Sony Ps-x75 Important notice re Main MicroProcessor MB8841-2

Post by mkoerner » 31 May 2019 19:45

This Cart does not have an Original needle! From the Color of the insert i would guess a low quality round needle!

Mike

revoLutionLP
Great Britain
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Re: Sony Ps-x75 Important notice re Main MicroProcessor MB8841-2

Post by revoLutionLP » 21 Jun 2019 20:34

HELLO!

Brand new member here. Greeting everybody.

How far did you guys get with the PS-X75 chip replacement? I'm very interested in one.

twhtalm? Anyone?

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