[sdiy] What's this component?

[Ken Stone]

I should add that if the part is on a small sub-board connected to the main
board via wires, it will be an optional crow-bar device, and likely to be an
SCR. If this is the case, isolate the board, check if the supply starts
without it, and make SURE that the supply is running at the correct voltages.

I lost a significat portion of synth when a poorly designed 723 based
COMMERCIAL PSU decided to dump 30 volts into the 15 volt line. A crow-bar
would have saved the modules.

On investigation, the moron designer had added an extra winding to the power
transformer so he could run the 723 itself at 40 volts. Duh.

Ken

>The part would be a custom numbering job for Power-One. It is most likely
>something like a 2N3055 or 2N2955. Occasionally a darlington may be used,
>but generally, it's a common power transistor. Yes, I know you said to-220.
>That is why I said "something like".
>
> 
>>Hi Paul,
>>
>>Thanks for replying.
>>
>>The part# of the power supply is SPL150-S109.
>>
>>Here are some pics of it:
>>http://kunst.phlimburg.be/~dvdborn/powersupply1.jpg
>>http://kunst.phlimburg.be/~dvdborn/powersupply2.jpg
>>http://kunst.phlimburg.be/~dvdborn/powersupply3.jpg
>>
>>I got in touch with Power-One but the replacement power supply (Map140)
>they suggested doesn't have the needed specifications.
>>
>>The EIII needs: +15V, -15V, +5V, -5V and +12V. (3A)
>>I'd be happy if anyone can suggest a replacement power supply or can find a
>replacement part for the Motorola 21407 K.
>>
>>Best,
>>David
>>http://dvdborn.blogspot.com
>>
>>>-----Original Message-----
>>>From: Paul Perry [mailto:pfperry at melbpc.org.au]
>>>Sent: Friday, July 14, 2006 03:11 AM
>>>To: 'David Vandenborn'
>>>Subject: Re: [sdiy] What's this component?
>>>
>>>David, I can't find NY reference to a motorola semi like that.
>>>(the 8835 is probably the date code, 35th week of 1988. They
>>>statred making the EIII in 1987).
>>>
>>>I'd ask Power One if they had a modern replacement for the whole power
>>>supply.
>>>It's possible..sizes have come down.
>>>Have you got a part # for the power supply as a whole?
>>>
>>>best, paul perry Melbourne Australia
>>>----- Original Message ----- 
>>>From: "David Vandenborn" <dvdborn at pandora.be>
>>>To: <synth-diy at dropmix.xs4all.nl>
>>>Sent: Friday, July 14, 2006 12:48 AM
>>>Subject: [sdiy] What's this component?
>>>
>>>
>>>> Hi,
>>>>
>>>> I am trying to repair the switching power supply of my Emulator III.
>>>>
>>>> The component I need to replace is a Motorola 21407 8835 K. It's in a
>>>> 3 pin TO220 package. So it could be a power transistor or FET or such.
>>>>
>>>> Does anybody know what it is, where to find this component or know a
>>>> replacement part for it?
>>>> I googled everywhere but no info was to be found.
>>>>
>>>> Some extra info: The Power Supply I'm repairing is a Power-One SPL150-
>>>> S109. I contacted Power-one but they don't give any support for it
>>>> anymore. So no luck there.
>>>>
>>>> Best,
>>>> David Vandenborn
>>>> http://dvdborn.blogspot.com
>>>>
>>>
>>>
>>>
>>
>>
>>
>_______________________________________________________________________
>Ken Stone   sasami at hotkey.net.au or sasami at cgs.synth.net
>Modular Synth PCBs for sale <http://www.blaze.net.au/~sasami/synth/>
>Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>
>
>
_______________________________________________________________________
Ken Stone   sasami at hotkey.net.au or sasami at cgs.synth.net
Modular Synth PCBs for sale <http://www.blaze.net.au/~sasami/synth/>
Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>