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Subject: Re: Part on my JBS which shouldn't be there! 8-?

Re: Part on my JBS which shouldn't be there! 8-?

From: Markus Grebenstein <>
Date: Wed, 13 Apr 2005 13:07:32 +0200

Hi Linus,

thanks for your answer and actualizing the documentation. I allready
replaced that part once and it is gone again within less than a week (no
bad DC- Adaptor or else for sure!) So I think there is another part which
is gone and kills the 34063. The major problem is, that the voltage on the
MOSFET is braking down, when the HD wants to spin up and I don't have any
idea where the problem is located (the MOSFET seems to work; source
voltage is strange but I can't find out where it's coming from; else I
don't find the diode 7 from the recorder scheme which might be the cause).
So I think replacing it will last just another couple of days. Since the
unit works when I COMPLETELY bypass HD- power I had the mentioned Idea....


Am Wed, 13 Apr 2005 07:12:46 +0200 schrieb Linus Nielsen Feltzing

> Markus Grebenstein wrote:
>> Hi guys,
>> my JBS 20 still doesn't work so I looked around at your wonderful
>> pages and found that the part whoch is blown on my JBS shouldn't be
>> there! It doesn't exist in the JBS schematics nor is it listed in the
>> player column on the Datasheet list! It's the Fairchild MC34063A DC-
>> DC converter.
> Ah. So newer studios have the 34063 as well... I have corrected the data
> sheet table.
>> So can my JBS run without it? Can i bypass somewhere and run it
>> without that strange charging circuit?
> No, you can't run without it. Not easily anyway. Better replace it.
> Linus
> _______________________________________________

Markus Grebenstein
Adalbertstrasse 88
80799 München
Received on 2005-04-13

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