4250 Jamming from tray 2

[theengel]

Re: 4250 Jamming from tray 2

Try doing it this way:

Sticky Solenoids

[j2shortt]

Re: 4250 Jamming from tray 2

If you just remove the sticky pad, you end up with the same problem because the metal plate on the solenoid gets magnetized and still sticks.

Well, I'll be God damned! I was puzzled why the solenoid kept sticking after I removed the pad! Thanks for the Info!

[Wild Bill]

Re: 4250 Jamming from tray 2

This is so common I thought I would give some help. This video show how to determine if the solenoid is bad without taking covers off. This test can be used on many other Laserjet printers.

[theengel]

Re: 4250 Jamming from tray 2

TO be fair, Elmtech was the first to point to that.

[blackcat4866]

Re: 4250 Jamming from tray 2

Congratulations on your success!

The definitive test if a solenoid pad is sticking is to press the solenoid down with your finger (or a tool) and hold it down hard for a minute or so. If there's any delay at all in release, take a look at the sound damping pad. I've seen some that are stuck so well, they take a good 10 seconds to get unstuck from the pad. If it's a paper tray that might be 4 pieces of paper multiple fed. If it's a duplex gate it might divert your copy to the exit instead of the duplexer (or vice-versa). If it's a flapper in a finisher you might get 4 or 5 revolutions instead of 1. The possibilities are endless. =^..^=

[Buddy]

Re: 4250 Jamming from tray 2

Turned out to be the #2 solenoid. As Engle mentioned, it got magnetized and would not release once it fired.

THANK YOU EVERYONE! (This forum is awesome.)

[Printerdude]

Re: 4250 Jamming from tray 2

You mention tray 2 paper pickup roller keeps cycling up and down, is it picking up paper when this happens? If not, check the paper tray back stop is set to correct position and not broken. If yes, replace or repair tray 2 paper pickup solenoid.

[Buddy]

Re: 4250 Jamming from tray 2

Thank Engel. I'm going to give that another look.

[theengel]

Re: 4250 Jamming from tray 2

From your post, I can't tell whether or not you're understanding what we mean by 'checking' the solenoid. The solenoid activates the feed from tray 2. There's a sponge pad on it, just like the one on the exit flaps you said were sticking. So the solenoid appears to work, if you're looking at it while running. The problem is, the sponge disintegrates and the solenoid sticks... not in the 'off' position but in the 'on' position. So it keeps feeding even though it shouldn't. This will cause a bunch of different jam codes--none of which really make sense.

If you just remove the sticky pad, you end up with the same problem because the metal plate on the solenoid gets magnetized and still sticks. Every tech has a different solution for this. Some replace the whole solenoid. Some replace the pad on the solenoid with something. Personally, I remove the pad and then bend the metal stopper up a little so that the plate doesn't come into full contact with the magnet. Iv'e done it to hundreds of machines (HP, Brother, Dell, Canon, etc.,) and have never been called back on one.

I might be telling you something you already know... I just couldn't tell, so don't feel insulted if you're well aware of all this.

[subaro]

Re: 4250 Jamming from tray 2

This machine is kicking my butt.

I tried oiling what I could, took the solenoid and gear assembly out. Didn't see any problems. Watched the solenoid - it's working ok. It feeds from the bypass and tray three ok. Checked the pickup roller black plastic guide - looked ok. It is giving me different codes and it's jamming in different places. Codes: 13.0, 13.98, 13.02 Getting z-fold jams intermittently at the registration roller.

Cleaned sticking exit actuator sponge pads that were causing sticking. Paper tray guides all look good.

Did notice that the paper lift didn't always work unless I really pushed tray 2 hard.

BELOW Is the sequence of the print cycle for tray two. Look at the items involved. Also the tray paper size switch pcb can cause problem, if they are not working properly and causing the machine to see the wrong paper size. Also did you remove tray1 completely and clean the pre feed roller assy[behind the feed and check that the ps102 actuator is working smoothly, even though it works fine from tray3.

Printing from tray 2
When the DC controller PCA receives print command, the main motor (M101) and scanner
motor start rotation. When the main motor reaches its prescribed speed, the feed roller clutch
(CL101) and tray 2 pickup solenoid (SL101) are activated. (The tray 2 pickup roller, tray 2 feed
roller, tray 2 separation roller, and paper feed rollers are driven by the main motor rotation.)
The tray 2 pickup roller, activated by the pickup solenoid, rotates once and picks up the media in
the tray. The unnecessary sheets are removed by the separation roller and the media is fed to
the pre-feed sensor (PS102).
The sheet then reaches the registration assembly, where its skew is corrected. Then it goes
through transfer, separation, and fusing stages; passes through the delivery unit; and is
delivered to the output bin.

The pre-feed, top of page, and fuser assembly delivery sensor (PS102, PS103, PS108) detect
arrival and passing of media along the paper path. If the paper does not reach or pass these
sensors within a specific amount of time the microprocessor on the DC controller PCA halts the
printer functions and a jam error message will appear on the control-panel display

[Elmtech]

Re: 4250 Jamming from tray 2

Check all sensors and re assy. Also see what paper size the machine auto detects. Could be one of those switched is intermittently going.

[Buddy]

Re: 4250 Jamming from tray 2

This machine is kicking my butt.

I tried oiling what I could, took the solenoid and gear assembly out. Didn't see any problems. Watched the solenoid - it's working ok. It feeds from the bypass and tray three ok. Checked the pickup roller black plastic guide - looked ok. It is giving me different codes and it's jamming in different places. Codes: 13.0, 13.98, 13.02 Getting z-fold jams intermittently at the registration roller.

Cleaned sticking exit actuator sponge pads that were causing sticking. Paper tray guides all look good.

Did notice that the paper lift didn't always work unless I really pushed tray 2 hard.

[Buddy]

Re: 4250 Jamming from tray 2

Thanks for the tips Subaru. I'm heading back out there tomorrow. Yes, it is jamming in the same place, right as it exits the fuser and is about to exit the rollers at the top. Also jamming in the #2 tray on a multiple run (a pcl printout).

[subaro]

Re: 4250 Jamming from tray 2

where in the printer is the paper stopping when it is jammed ?. Is it at the same place or at different points. I have repaired hundreds of these machines and found that a good cleaning and lubrication is all it needs, together with the swing plate assy if it is worn. The feed unit that sits just behind the manual or as it is also used and called tray1 needs to be cleaned and the bushings lubed with a drop or two if triflow oil. Also the torque limmiter on the tray itself can cause feed issues. Also make sure that the exit actuator is moving freely and not sticky. never had to replace or repair a solenoid on these machines, the older hp laserjet that was an issue.

Also examine the paper tray carefully and make sure the guides are in the right position and no broken parts. open and close the tray a couple of times and check the machine is seeing the correct paper size all the time. print from the bypass tray and see if it jams from there too. that actually is the first thing i would do.

[Buddy]

Re: 4250 Jamming from tray 2

I did replace the pick up roller, Engle.