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Patrick

Thu Feb 27 2014, 06:37AM

Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639

I have a HP P1102w laser printer for printing PCB transfers. But now it just prints solid black pages.

So is the corona wire inside the toner cartridge? And what happens if it breaks?

Wastrel

Thu Feb 27 2014, 12:45PM

Registered Member #4095 Joined: Thu Sept 15 2011, 03:19PM
Location: England.
Posts: 122

I think without a working corona you wouldn't get toner sticking to the drum. While pretty much anything could be broken it sounds consistent with a dead laser, assuming a laser is even used in this model.

Edit, It seems that a dead laser or a stopped scanner would bring up an error.

Shrad

Thu Feb 27 2014, 03:07PM

Registered Member #3215 Joined: Sun Sept 19 2010, 08:42PM
Location:
Posts: 780

laser modulation always on, I'd say, as this is the polarization from the laser beam which enables toner powder to be deposited... (or inverse if this is a negative image as corona is negative and a negative charge should attract more than a positive ^^)

testtest

Thu Feb 27 2014, 09:25PM

Registered Member #3271 Joined: Mon Oct 04 2010, 02:29AM
Location: Canada
Posts: 159

Patrick wrote ...

I have a HP P1102w laser printer for printing PCB transfers. But now it just prints solid black pages.

So is the corona wire inside the toner cartridge? And what happens if it breaks?

My HP33440 service manual has the following diagnostics:

Full black page:
1) No primary corona to apply negative charge to the drum surface.
2) Controller PCA. If the laser was continually "on" the surface of the drum would constantly be discharged by the laser. this results in a black page.
3) Beam detect circuit problem. If no laser beam is detected or not able to see its position at the end of scan and regulate its intensity, the feedback and timing circuit will try to increase the laser light output (see 2 above) until it is maxed out.

Full white page:
1) No developing bias to pass the drum charge to the toner.
2)No drum ground path. Discharging effects of the laser will not occur and the highly negative charge placed on the drum by the primary corona would repel all toner leaving a white page.
3)Drum not rotating
4) no toner in cartridge
5) sealing tape not removed from new cartridge
6)Beam to drum mirror blocked
7) transfer corona wire broken or no high voltage

Hope that helps your troubleshooting.

Patrick

Fri Feb 28 2014, 12:32AM

Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639

My HP33440 service manual has the following diagnostics:

Full black page:
1) No primary corona to apply negative charge to the drum surface.
2) Controller PCA. If the laser was continually "on" the surface of the drum would constantly be discharged by the laser. this results in a black page.
3) Beam detect circuit problem. If no laser beam is detected or not able to see its position at the end of scan and regulate its intensity, the feedback and timing circuit will try to increase the laser light output (see 2 above) until it is maxed out.

Its near impossible to take apart, plastic and screws in wierd places... i suspect its a non-repairable type model....

Chit! this means i cant print circuit board transfers now.... Grrrr!

grrrr! i have 2 Brother laser printers and a canon ink jet, none of which can be used for transfers! grrrr!

sigh...might as well try.

testtest

Fri Feb 28 2014, 02:08AM

Registered Member #3271 Joined: Mon Oct 04 2010, 02:29AM
Location: Canada
Posts: 159

I have three old (25 years) HP printers based on the venerable Canon engines. Not sexy by today's standards grant you but built like a thank. Everything is repairable and there are plenty of info on the web. For doing "non conventional" stuff they are perfect since they were made for office use with thousands of several pages a month duties.. Cartridges are still available they are cheap to get too if you don't mind a few fixes. have a look at HP LaserJet series II and III and so on... You can probably print a waffle or a pizza on these and they wont mind...

Patrick

Fri Feb 28 2014, 02:30AM

Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639

Hp P1102w is in the trash can, bad laser.

im going to mod my brother HL- 2170W to take generic or HP toner.

Patrick

Fri Feb 28 2014, 03:48AM

Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639

ok brother cartridge has hp toner now....

Shrad

Fri Feb 28 2014, 07:43AM

Registered Member #3215 Joined: Sun Sept 19 2010, 08:42PM
Location:
Posts: 780

hmm laserjet IIIP is the cream of the cream...

I might just try to get one again... this thread has subliminal effects

Wastrel

Fri Feb 28 2014, 08:28PM

Registered Member #4095 Joined: Thu Sept 15 2011, 03:19PM
Location: England.
Posts: 122

Apparently I'm ignorant. While I'm reading up on my blindspot...

Try taking out the print cartridge, giving it a shake and putting it back in and then reinstalling the drivers. There is a report of this working on the net. If that doesn't work try another cartridge. Try printing a test page to rule out driver problems.

Service manual here.

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