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Vintage Computers Any vintage computer systems, calculators, video games etc., but with an emphasis on 1980s and earlier equipment.

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Old 27th Mar 2020, 8:38 am   #1
Tony Jaques
Triode
 
Join Date: Aug 2015
Location: Manchester, UK.
Posts: 23
Default HP Deskjet 690C. Transistor info needed.

Hi there,
Firstly I do apologise if this is in the wrong place, or even if it should not be here at all. If so I am sure that someone will berate me, but I could see nowhere else!
I have had the 690c passed on to me - not working of course. It has a PSU problem. On the only PCB (C6409-A-54) There is a surface mount transistor Q3. Unfortunately it has become upset beyond recognition. Service info seems to be unavailable, but someone somewhere must have it. Can that someone tell me what the transistor is please?
Even better - a circuit of this part of the board might save me a lot of tracing.
Thank you for at least considering this.
Tony...
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Old 27th Mar 2020, 9:56 am   #2
peter_scott
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Default Re: HP Deskjet 690C. Transistor info needed.

Hi Tony,

I would just try to guess at the characteristics. I would assume it's not a high frequency part so you only need to guess at the power ratings and gain.

Peter
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Old 27th Mar 2020, 11:30 am   #3
mervyn
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Default Re: HP Deskjet 690C. Transistor info needed.

From my days servicing HP laser printers , i very much doubt there will be any schematics available down to component level.. not outside HP or official service centres
Even with proper service manuals from HP it was usually a case of work to find area and then board swap or part swap
I think the previous reply would be the way i would go
regards
Merv
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Old Yesterday, 1:24 pm   #4
Tony Jaques
Triode
 
Join Date: Aug 2015
Location: Manchester, UK.
Posts: 23
Default Re: HP Deskjet 690C. Transistor info needed.

Hello Peter and Merve,
Thank you for taking the trouble to reply.
That is much as expected. That's a good point about the transistor type not being critical. It should not be a problem finding NPN or PNP from a circuit trace, and with a bit more, luck whether Bipolar of FET. I am sure that you will understand that I was just hoping, however optimistically, to shorten the process.
I will check back in a few days. You never know!
Thanks.
Tony...
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Old Yesterday, 2:04 pm   #5
Nickthedentist
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Default Re: HP Deskjet 690C. Transistor info needed.

I have a CD-ROM called "APS SERVICE MANUALS FOR HP DESKJET" which I would imagine might cover this model. Looks like a bootleg copy of something designed for HP service departments, bought on eBay in 2002.

However, I think it ran on Windows 98 so I can't check anything at the moment.

You're welcome to borrow it if you want - I can post.

Nick.
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