Determine laser printer problem

[Paul Lady]

Anyone know a site that gives good info on diagnosis of HP 1100 laser
printer problem?

I have dug up the manual but am getting no joy with it.

The engine printer test produces the intended page full of thin lines wall
to wall and spaced about 1/8" apart.

The lines come out of the printer not completely fused to the page in many
areas and create a lot of internal dirt on the rollers.

TIA, pjl

 

[bmoag]

A replacement laser printer will be cheaper than a repair.

 

[Darrell]

Agree with other response, replace would be best choice.
The 1100 did have a nice print quantity for the price; however, it had
a paper feed issue that caused multiple pages to feed. A repair was
free years ago but no longer available.

There are plenty of newer models in that range (I have the 1100, a
newer 1300, and now a color all-in-one 2840) (plus dozens of varieties
at work), which print faster and still give high number of prints per
cartridge.

 

[Tony]

Anyone know a site that gives good info on diagnosis of HP 1100 laser
printer problem?

I have dug up the manual but am getting no joy with it.

The engine printer test produces the intended page full of thin lines wall
to wall and spaced about 1/8" apart.

The lines come out of the printer not completely fused to the page in many
areas and create a lot of internal dirt on the rollers.

TIA, pjl

If the page is not correctly fused then the fuser is at fault, in this case you
should consider replacement (as others have suggested).
Tony
MS MVP Printing/Imaging

 

[ato_zee]

A replacement laser printer will be cheaper than a repair.

May not be the fuser, so money spent on replacing it may be
wasted. The fuser houses the fuser temperature sensor, but the
control electronics may be causing the problem.

 

[Paul Lady]

Thank you all who have added to my insight.

First, to the replacement issue, at some point things get to be a crusade,
not therefore logical. Know what I mean? I came to own three of these
printers via my spouse's work, who considered them junk (probably
correctly).

Now it has become a challenge to try to get at least one working. I have
been successful with the paper feed issue and have that solved. I have one
working rather well as an optional paper type on my home network. The
remaining two seem to have the identical problem. I had hoped to salvage at
least two of the three by mixing and matching the correct parts.

Is there a good way to prove that the fuser is the problem? The manual
seems stuck on replacing the ECU or the laser scanner assembly to solve
problems.

TIA, again, pjl

 

[Paul Lady]

More thoughts after checking the manual:

Now that I know what the "fuser" is in the printer, here's the status:

I have checked the resistance specs given in the manual and the heating
element seems to be OK.

The element itself, when removed and inspected reveals a lot of carbon
buildup on the cylinder of film that is the outside of the working part of
the element. I have cleaned this area, but this "dirt" seems a strong
indicator that the problem is in this section. After running a page thru
this section, the local temperature increases, indicating that the heating
element is working.

Now I've got conflicting data and don't know where to go from here. Is
there more to the fuser working properly, like controls on the ECU? Or a
local temperature sensor that is shutting off the heater before it gets to
working heat?

Looking and hoping for more expert advice so that I might swap parts and get
one printer functioning.

Thx, pjl

 

[Tony]

The fuser has a thermister that controls the temperature, if that has failed
(ie turns the heater off too early the printer may not fuse the toner
correctly).
I was unaware that you have access to other parts but in that case I suggest
you replace the fuser first and see if that works, failing that the ECA can be
the cause although that is less likely to be the cause. The scanner will not
cause poor fusing.

More thoughts after checking the manual:

Now that I know what the "fuser" is in the printer, here's the status:

I have checked the resistance specs given in the manual and the heating
element seems to be OK.

The element itself, when removed and inspected reveals a lot of carbon
buildup on the cylinder of film that is the outside of the working part of
the element. I have cleaned this area, but this "dirt" seems a strong
indicator that the problem is in this section. After running a page thru
this section, the local temperature increases, indicating that the heating
element is working.

Now I've got conflicting data and don't know where to go from here. Is
there more to the fuser working properly, like controls on the ECU? Or a
local temperature sensor that is shutting off the heater before it gets to
working heat?

Looking and hoping for more expert advice so that I might swap parts and get
one printer functioning.

Thx, pjl

Tony
MS MVP Printing/Imaging

 

[ato_zee]

Do wish people would search first then ask.

http://www.eserviceinfo.com/
Enter 1100 and hp in the mfr box and the service manual can be
downloaded for free. I regularly get manuals from there.
HP Laser Jet 1100 Laser Jet 1100A.rar 31-05-2004 Service manual Printers 877 kB 9132
HP Laserjet 1100 jmbnjorge (194)
hp1100service.rar 29-07-2004 hp-1100 Service Printers 1547 kB 8150 HP 1110 voivoda
(27334)

There may be a temp setting diddle pot in the ECU so mfr can compensate
for variations in thermistors, or, you can fake it by modifying the thermistor
so that the ECU sees a different (lower) temp than the thermistors temp, so turns
up the wick a bit further. Just add an extra resistor to make the ECU think the
fuser is at a lower temp.

 

[Paul Lady]

Very, very helpful. Thx guys, i'm off to the work bench.

pjl

 

[Paul Lady]

Thx for all the help. I scored three for three. Two in excellent shape,
one pretty good.

thx again, pjl