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From: [SMF] on 28 Jan 2010 16:43
On 1/27/2010 10:56 PM, DaveC wrote:
> I'm trying to troubleshoot an error with an HP ink jet printer (Photosmart
> 3210) that says "Ink System Failure". All other components seem functional.
>
> In the printer there is a small PCB with a few soldered components that
> appear to sense ink flow or pressure. It is in series with the pump output.
>
> <http://i48.tinypic.com/o8xz84.jpg>
>
> <http://i49.tinypic.com/r76kib.jpg>
>
> How does this work? Are these 6 LEDs and photodiodes? Just detecting the
> presence of ink doesn't seem likely. Wouldn't movement or pressure be what is
> detected?
>
> What does this PCB do and how does it do it?

Oh, and I believe that is the heater circuit for the jets.
From: DaveC on 28 Jan 2010 20:49
> Have you actually looked for the repair manual for that printer online?
> I found the one for my Epson R200 without much problems.
> All parts are listed...

Yes. Nothing turned up.

If someone knows where to find the manual for HP Photosmart 3110/3210/3310
all-in-one printers (not the LaserJet 3210 -- why a company would duplicate
model numbers...?) please let me know.

Thanks for your reply.

From: DaveC on 28 Jan 2010 20:53
> Oh, and I believe that is the heater circuit for the jets.

There is 18 inches (45 cm) between this pcb and the print head. Hmm...

Thanks for your reply.

From: Royston Vasey on 29 Jan 2010 00:06

"DaveC" <invalid(a)invalid.net> wrote in message
news:0001HW.C7877F9000B954ACB08A39AF(a)news.eternal-september.org...
>> Oh, and I believe that is the heater circuit for the jets.
>
> There is 18 inches (45 cm) between this pcb and the print head. Hmm...
>
> Thanks for your reply.
>

I had a wild guess along the same lines (not saying SMF was guessing - just
me). Maybe a heater element inside the black cylinders causes air expansion,
pushing air down the tubes as a purge function?????????


From: DaveC on 29 Jan 2010 13:07
> No diode effect measured. Resistance between each of the 6 pairs of "probes"
> is 100K ohms. This, of course, is the measurement of the parallel SMD
> resistor.

A correction: R1, R5, R6 measure 100K; R2, R3, R4 measure 200K. This is true
of 2 different PCBs (the "subject" printer and a used spare), both from
printers with the same error code.

Maybe a manufacturing error (ie, these were supposed to all be the same
value)?

Ideas?

Thanks.

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