Canon np6221 jams at exit slot

[Dakaty]

I was lurking around here trying to find some prior posts for my problem but couldn't.

My Canon 6221 frequently jams at the exit roller device. Most of the time the copies come out perfect. However, sometimes the paper hangs up on the plastic fingers on the inside of the "exit door" leading to the sorter. Sometimes the paper hangs up on the right hand side and sometimes on the left. The paper is folded into a very small paper fan with about 1/4 " pleats. The teflon roller at the heat fuser has been replaced, but not the lower pressure roller.

I do not see any blockage at the exit slot and the plastic fingers do not appear to be damaged. There appears to be sufficient pressure/traction between the upper heating and lower pressure rollers as the paper is pushed into the fan as described above.

The problem is random as it may not happen for 20 copies, then, presto, paper fan!

Any suggestions?

THANKS


Bill

[blackcat4866]

NP2020/2120/6221 are officially termed "Jammomatics". They can jam often for no apparent reason. But there are a lot of good reasons to check for:

1) Misfeed occurs as the paper is leaving the drum, and is intermittent. Also motor noise may occur during the copy run that jams occur. Check the optics cooling fan for proper operation. Replace optical cooling fan (FH7-1734-000).
2) Misfeeds almost every copy. Check for loose ground wire connection from the transport bed to frame ground. A dark blue wire should be evident coming through rear frame of copier w/ fan and sensor harness. Noise can build up from the s/t corona if ground circuit not complete. Connect transport bed ground wire.
3) Misfeeds and dumps toner. Check to see if main motor runs backwards. Replace the main motor (FG9-0998-000).
4) Misfeeds at registration roller, narrow voids in the crossfeed direction. Also loud squeal, on NP1820, NP2120, NP6221. Rusted/seized upper vertical feed clutch. Green knob turns with difficulty, or not at all. Temporarily clean by soaking in alcohol. Clean clutch surfaces with folded paper and alcohol. Replace upper vertical feed clutch (FH7-5436-000) ASAP.
5) Misfeeds at the fuser. The waste toner may be overfull, stall the the main drive motor. Empty the waste toner.
6) Misfeeds at the registration roller, accompanied by a clunk at the start of the copy. Light source 1 hangs up on the white level reference. Reposition the white level reference (the three tabs interlock in the top left frame).
7) Misfeeds from cassette. Pickup clutch slips. Clean or replace pickup clutches. Lubricate only with Marvel Mystery Oil; not dry, not any other lubricant. New style clutches are available which also require the same lubrication.
8) Misfeeds from cassette. Broken or old style cassette body. Replace cassette body new style (FF2-3929-030), with the tapered front edge.
9) Misfeeds from cassette. Stripped screws or broken right cassette rail. Drill through the stripped hole and install a 4 mm x 20 mm machine screw and nut, or replace right cassette rail.
10) Misfeeds from cassette. The paper never leaves the cassette. The cassette latch may be bent, or the screws stripped because of customer misuse. Reform or replace the metal machine-side cassette latch.
11) Misfeeds from cassette. The paper never leaves the cassette. The paper lift springs may be weak. Stretch the cassette lift springs ~15 mm longer.
12) Misfeeds immediately at completion of warm-up. Copying begins, and a jam is shown. The bypass tray sensor range should be 0 to 5 VDC, changing state, at connector J13-8 on the DC controller. If significantly less than 5 volts, determine cause of draw down. Replace the operation panel.
13) Misfeeds in the delivery. Exit rollers become worn under normal use. They turn from light gray to black with deep cracks or grooves. Replace the exit roller shaft.
14) Misfeeds in the delivery. Inadequate pressure from upper idlers for the exit roller shaft. Reform the leaf springs for additional pressure.
15) Misfeeds in the delivery. Magnet on exit sensor is missing. Replace the magnet in the exit sensor.
16) Misfeeds in the fuser claws. The Copylite fuser roller builds up toner quickly when the customer runs heavy fill originals such as photos (60% fill or more), possibly two-sided. Install a Canon upper fuser roller FC2-2249-000) and claws (FB1-0301-000). Note: Heavy fill and two-sided can be particularly difficult for this model.
17) Misfeeds in the right door. The paper reaches the vertical rollers consistently, but no farther. The vertical feed idler pressure springs may be weak. Stretch the vertical feed idler pressure springs from 23 mm to 40 mm.
18) Misfeeds in the vertical path. Lower right door hinges are broken. Replace lower right door hinges (FA6-5606-000, FA6-5607-000) and door strap (FA6-5453-020).
19) Misfeeds intermittently on the bed. The pre-registration flag may be hanging up on a burr where it passes through the lower registration guide. File any burrs from the lower registration guide plate, where the pre-registration flag passes through it (yes, it must be removed). Also add (1) additional wrap to the pre-registration flag return spring.
20) Misfeeds on bed, 2 pages. Broken interlocks on bed pulleys. Temporarily install a small hose clamp between front and center bed pulleys. Replace bed pulleys ([3] FA6-5338-020) & tie wrap interlocks next call. When cleaning the bed section, clean all bushings and pulleys. No lubrication.
21) Misfeeds on bed, poor separation. Check for plastic covers on the transfer corona blocks. The arcing will cause the separation corona to fail. Replace s/t corona block covers.
22) Misfeeds on bed, poor separation. Separation static eliminator is shorting. Replace static eliminator.
23) Misfeeds on bed, very intermittently. Paper stalls on the bed or exits the copier skewed. The paper does not touch the runners between the bed belts. Poor bed suction because the bed fan duct is warped, and fits loosely. A 3mm gap at the edge nearest the fuser is not uncommon. With adequate suction paper is pulled down to the runners on all copies, even the second side. (2.5 hours to complete.) Strip the bed down and clean all parts, especially the metal frame and duct. Install the switch flag & duct. Seal edges of the duct with silicone sealer/adhesive. Install bed runners & seal the openings into the duct. Install bed fan & seal the edges.
24) Misfeeds on the bed. Bed handle breaks repeatedly. Loose screws in bed lift cams. Tighten screws in bed lift cams (FA6-5357-000). Replace bed handle (FA6-5358-000).
25) Misfeeds on the fourth copy. One sheet will be on the bed, and one will be near the registration roller. The copier will only jam when using ADF and non-AE mode. Check the reed switch in the exit area. Replace the exit reed switch (FH7-7237-000).
26) Misfeeds when auto cassette selects the paper deck. The copier requires a version 7 PROM or higher to be compatible with the paper deck. Install a DC controller with the latest PROM, version 7. See tech pub NP2120/2020-3.

This should keep you busy for a while......

Start with #25, #15, #13, #14, & #16.

=^..^=

[Dakaty]

Thanks for all of that. I will keep all for future (and current) reference.

My first inclination is to increase the spring tension between the fuser rollers. The "fanned" pages never reach the "exit" rollers so that is no likely the problem. The "fngers" may need to be replaced

There are two allen screws that will tighten the springs on both sides of the fuser rollers. Is there a "rule of thumb" on how tight these should be?

Thanks

Bill

[blackcat4866]

It's four millimeters nip wdith. The way you measure this is:

Key the front door switch so that you can copy with the front door open. Run a letter size sky shot (all black copy with the lid open). When the copy is ~ 1/3 way into the fuser pull the key to stop the copier. Count to ten (One one thousand, two one thousand, ....). Remove the piece of paper in one steady motion (remember it's only partially fused). You'll see a glossy stripe down the center of the page. Measure at both ends and the center. The ends should be 4mm and the center +/- 1mm (3 to 5 mm).

Keep in mind that you won't get very many consecutive sky shots through this copier without jamming. After 4, run some blank pages to clean the fuser.

=^..^=

[logonjim]

np6221

If I was you I would leave the nip wdth alone the type of jam you are getting is a concertina jam as we used to call it and the most likely reason for this is seperartion claws badly worn or the bushings in the top roller or the bearings seized on lower roller

[Dakaty]

Logonjim

Actually the bushings on the top roller were severly deterioated when the roller was changed. As I did not have these replacement bushings on hand, I re-installed them. The roller seeemed to turn properly, but the bushings were definately in need of replacement.

I will try to find those and replace.

Thanks

Bill

[blackcat4866]

That will make a huge difference.

If the bushings are worn, the roller repositions itself upward, changing the angle on the lower fuser inlet guide, changing the positioning ot the upper claws, and decreasing the nip width, changing the ring gear lash. Any one or two of these will cause you're problem.

Good catch. =^..^=

[yourownfree]

you have bad sep claws. They become worn jagged, and blunt on the ends. The paper comes through and because you dont have enough lead edge void it hangs on the fuser roller and hits the sep claws either front or rear. Thats what you said it hits the sep claws. Replace the sep claws and increase the lead edge void to at least 3mm. Also be sure that the paper is entering the fixing section straight. Which indicates some of the problems mentioned before, like transport belt not turning (one of them not turning) since the drive shaft tends to break for one of them and though the other will still turn. Cheat the door switch, look inside while it's copying, you will see what is happening to the paper.
Either way your sep claws are shot because the paper has been hacking at them and making the ends blunt and not smooth and sharp like it was new.
You still need to make sure the paper is entering into the fuser straight.
One thing to add to that long list is this:
The foam pad on the pick-up clutch solenoids become old and sticky, causing the solenoids to remain in the on state (without activation) and causing the pick-up clutch to rotate more times than needed. remove the sticky foam from the solenoid to resolve. Its a little noisier when the clutch fires, but at least it works.
Oh and dont forget to put in a new oil cleaning roller at the fuser. That will help with keeping the fuser roller clean and lubed so copies dont stick as well. Otherwise the teflon will get hot and dry and break down sooner. The lower fuser roller bearings and lower roller should be changed as well, since the bearings will eat the shaft away. Look for bearing dust below the bearings and you will know it is shot .

[blackcat4866]

I forgot about the pickup solenoid foam!

When I have the clutches out for cleaning, I usually make sure that the foam and adhesive is completely gone, and I'll put a small disk of black tape in its place to damp some of the noise.

Good Times! I could clean these clutches in my sleep I've done it so many times.

It's still a "Jammomatic".

=^..^=

[Dakaty]

Thanks

I've got upper & lower picker fingers and upper roller bushings on the way.

I'll start with those replacements, make the suggested checks, then work my way through the rest.

Thanks for all the help!

[amuba]

I was lurking around here trying to find some prior posts for my problem but couldn't.

My Canon 6221 frequently jams at the exit roller device. Most of the time the copies come out perfect. However, sometimes the paper hangs up on the plastic fingers on the inside of the "exit door" leading to the sorter. Sometimes the paper hangs up on the right hand side and sometimes on the left. The paper is folded into a very small paper fan with about 1/4 " pleats. The teflon roller at the heat fuser has been replaced, but not the lower pressure roller.

I do not see any blockage at the exit slot and the plastic fingers do not appear to be damaged. There appears to be sufficient pressure/traction between the upper heating and lower pressure rollers as the paper is pushed into the fan as described above.

The problem is random as it may not happen for 20 copies, then, presto, paper fan!

Any suggestions?

THANKS


Bill

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[Dakaty]

I changed out the upper and lower separater claws (fingers?). Man those little springs are booger bears!! I also replaced the upper teflon roller bushings.

So far... real good. No jamming all day!

Thanks for all the help guys. I really appreciate it.