Path: ...!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!eternal-september.org!.POSTED!not-for-mail
From: bp@www.zefox.net
Newsgroups: sci.electronics.repair
Subject: Re: HP printer trouble
Date: Fri, 18 Apr 2025 14:59:16 -0000 (UTC)
Organization: A noiseless patient Spider
Lines: 67
Message-ID: <vttpc4$37ned$1@dont-email.me>
References: <v695dlxnii.ln2@Telcontar.valinor> <bei20k9ciaavlgv63vsqo6b00et2093qh1@4ax.com> <bb38dlx84h.ln2@Telcontar.valinor> <vtrqpp$4j6d$1@dont-email.me> <p6v9dlxmtn.ln2@Telcontar.valinor>
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Injection-Date: Fri, 18 Apr 2025 16:59:17 +0200 (CEST)
Injection-Info: dont-email.me; posting-host="5f800ad09cf81348bc3168500bdad27e";
	logging-data="3399117"; mail-complaints-to="abuse@eternal-september.org";	posting-account="U2FsdGVkX1/EmTR6qzjOHj6a0m16BPyQCWryD2CkRXs="
User-Agent: tin/2.6.4-20241224 ("Helmsdale") (FreeBSD/14.2-STABLE (arm64))
Cancel-Lock: sha1:x8CsOzBnRenorHHWurXxLxgWwzM=
Bytes: 4260

Carlos E.R. <robin_listas@es.invalid> wrote:
> On 2025-04-17 23:11, Jeff Layman wrote:
>> On 17/04/2025 21:02, Carlos E.R. wrote:
>>> On 2025-04-17 20:56, Jeff Liebermann wrote:
>>>> On Wed, 16 Apr 2025 20:23:59 +0200, "Carlos E.R."
>>>> <robin_listas@es.invalid> wrote:
>>>>
>>>>> But today it claimed to have a paper jam. I opened the paper drawer, 
>>>>> the
>>>>> back panel, the toner drawer. No paper jam at all. I closed it again,
>>>>> the printer tried again, and after two tries it continued printing 
>>>>> happily.
>>>>
>>>> There are various plastic "paddle" sensors along the paper path that
>>>> are used to detect paper jams or misfeeds.  If the rubber paper feed
>>>> roller slips slightly when trying to feet a page, the printer will
>>>> detect that the paper is "late".  The printer then declares a paper
>>>> jam.  If it correctly feeds a few pages, but then jams, my guess would
>>>> be the same as the other Jeff's.  You might have lint, dust, clay
>>>> paper coating, loose toner, shreded paper, insects, etc that are
>>>> causing the rubber rollers to slip on the paper.
>>>>
>>>> For the CP1515, it's likely that the rubber has been polished smooth
>>>> by the slightly abrasive paper.  That will also make the roller slip.
>>>> Try removing the rubber part of the roller from the plastic drum and
>>>> flipping it over.  That should give the roller a 2nd life.  However,
>>>> what works every time is to purchase and install a rebuild kit.  At a
>>>> minimum, you need at least the feed roller RM1-4426 and the separation
>>>> roller RM1-4425. For example:
>>>> <https://www.ebay.com/sch/i.html?_nkw=cp1515%20rebuild%20kit>
>>>>
>>>> I can think of a few uncommon failures that might cause a paper jam
>>>> indication.  Try roller cleaning and replacement before we go down the
>>>> rabbit hole.
>>>>
>>>
>>> Well, your explanation allows me to understand what is going on, but I
>>> don't think I would be able to disassemble the thing.
>> 
>> You could try that tonerbuzz tip of soaking the centre of a sheet of 
>> paper with alcohol and running it a few times through the printer. No 
>> disassembly required.
> 
> Won't it damage the... what's the name, toner cylinders when the paper 
> gets to that section?

It's certainly best not to touch the "drum", the photoconductive layer 
that forms the printed image. Whether the drum will be damaged by the
solvent depends on the coating and solvent. But, again, what's to lose?
If you could get the paper transport to at least try to pick up a page
without the drum being present it'd be helpful. Also unlikely 8-(

A volatile solvent like alcohol has a good chance of being harmless. A
chemical softener for the rollers, like light oil or glycol-based brake
fluid, will almost certainly wreck the drum. But, drums are wear items
and don't last forever. It'd be worthwhile to check the price, though.

> 
> I might be able to reach the roller with my hand and tissue paper or a 
> brush.

A wad of cloth taped to a stick would be better than nothing. 

Good luck, I hope you get it working!

bob prohaska