MX-C311 - (etc) L4-16 Pressure Release issues still occurring after "updates"

[RascalMJ]

Re: MX-C311 - (etc) L4-16 Pressure Release issues still occurring after "updates"

I can verify this; it can and will break the actuator flags. The sub power should go off first, when screen is black, the main power gets turned off. If the main power is tripped, the pressure stays on. Not only will this break fuser parts, but it can give some real nice flat spots on the press roll.

Wow, awesome.... Thanks for this!

[ZOOTECH]

Re: MX-C311 - (etc) L4-16 Pressure Release issues still occurring after "updates"

Now, this is interesting..... this latest customer when she gets a jam, she has been known to kill the main power (despite my best efforts), but I didn't make a connection to this issue.

It's all about teaching (if possible) the customer (and unfortunately, some techs) that throwing the main power switch first or pulling the AC cord is not the way to shut down the copier.
Thanks Mojo for confirming what I had suspected.

[blackcat4866]

Re: MX-C311 - (etc) L4-16 Pressure Release issues still occurring after "updates"

... Its a shame you cant use the mono fusers (B42FU1) as these things NEVER give that code. Not to mention the press rolls can look like deep fried sausage and the CQ is still good.

Most of the ones I'm seeing are the B401 fusers, and most of the time it's the cam splitting, and just falling off in the bottom of the fuser.

I haven't been able to verify the problem that when the copier is powered down incorrectly, it could cause the actuator to be in the wrong position when powered back up.

I'll confirm from techs that have done it to themselves. You can't pull the fuser unit until the fuser is in the pressure off condition. If you do, the first thing the machine does at power up is bust the flag, with a distinct crunch.

Best I can give you is this bulletin.

[ATTACH]21903[/ATTACH]

States that machines produced after March 2010 will have the upgraded pressure release actuators. The bulletin you linked was the 2013 improvement where it adds .05mm to the diameter of the actuator so it doesn't get destroyed by the heat. Two different problems with the same part really, in one case you'll have it bent in half and snap off (2010 change) from hitting the sensor, in the other it'll crack around the shaft and fall straight off (I assume, haven't had that one happen to me)....

That's been our experience. I just can't imagine where the load is coming from on the miniscule flag, weighing a few grams, resting on cam, with a light return spring. I can only think that the cam has some sort of inherent weakness in the molding process that is exacerbated by the constant heating and cooling of the fuser environment.

And thanks for the bulletin, by the way. =^..^=

[mojorolla]

Re: MX-C311 - (etc) L4-16 Pressure Release issues still occurring after "updates"

The B401 still used the C32FU1. It wasn't until the B402 and B402SC that the B42FU1 was introduced. Zero issues and a breeze to rebuild.
B401 also had a black DV cart instead of a DV unit and developer on the B402 and B402SC.
Pretty solid boxes with the exception of fuser and doc feeder.

I am curious about something while we are talking Frontier machines............................
In our North American manuals, the secondary transfer unit (color and mono) is listed as MX-C31U2 and is rated at 60k life span. There is another Sharp part, MX-B42U2, it is rated at 120k. I have been using the B42U2 on B401,402,SC machines for over a year now with twice the life span and zero problems.

Does anyone else use these?

When this is searched in Sharp web sites, no results are found. There is no mention of it in any manual I have found. I even asked a few Sharp guys and they had never heard of it.

[spanky]

Re: MX-C311 - (etc) L4-16 Pressure Release issues still occurring after "updates"

See attached bulletin. The actuator for the fuser pressure has been changed again. The new one has an A4 stamped on it. I have had new machines and new fusers from Sharp with the A3 version of the actuators installed in them. I check all new machines and fusers for the new actuator. I also verify that the pressure plate is white.

[blackcat4866]

Re: MX-C311 - (etc) L4-16 Pressure Release issues still occurring after "updates"

... I am curious about something while we are talking Frontier machines............................
In our North American manuals, the secondary transfer unit (color and mono) is listed as MX-C31U2 and is rated at 60k life span. There is another Sharp part, MX-B42U2, it is rated at 120k. I have been using the B42U2 on B401,402,SC machines for over a year now with twice the life span and zero problems.

Does anyone else use these?

When this is searched in Sharp web sites, no results are found. There is no mention of it in any manual I have found. I even asked a few Sharp guys and they had never heard of it...

I'm not sure how it translates, but the number we've been using is DUNT-8344DS14. Most of the transfer belts I've seen on this series are not ripped, but badly textured from the inside at 74.5mm intervals, leaving silhouettes of the texture pattern in the heavy fill areas. I'm not terribly impressed by the thin mylar-like belt material.

That's good information about the MX-B42U2 and the B42FU1. If the opportunity presents itself I may make a suggestion to that effect.

Oh, and by the way, another source of L4-16, L4-12, and F5-64 codes can be dirty power. The location I have in mind was sagging to 100VAC and ground to neutral 9VAC, every time the refrigerator cycled. I wonder what the problem could be? =^..^=

[RascalMJ]

Re: MX-C311 - (etc) L4-16 Pressure Release issues still occurring after "updates"

See attached bulletin. The actuator for the fuser pressure has been changed again. The new one has an A4 stamped on it. I have had new machines and new fusers from Sharp with the A3 version of the actuators installed in them. I check all new machines and fusers for the new actuator. I also verify that the pressure plate is white.

Yeah, I just saw that late last week. I ordered some of the parts, and actually got an A4. WoHOO!!

Most of the ones we have in the field now are the "double dot" version. We seemed to skip right over the A3 ones. ha

[RascalMJ]

Re: MX-C311 - (etc) L4-16 Pressure Release issues still occurring after "updates"

I'll confirm from techs that have done it to themselves. You can't pull the fuser unit until the fuser is in the pressure off condition. If you do, the first thing the machine does at power up is bust the flag, with a distinct crunch.

YIKES!!! With all the fuser swapping we have had to do to keep these things "in service", we usually do pull them "hot" for testing and what not. May be contributing to some of our issues... although I have never had one break while I was servicing one. Good to know for future reference though to adjust our procedures.

Thanks

[pbbsinc]

Re: MX-C311 - (etc) L4-16 Pressure Release issues still occurring after "updates"

^{In addition to all of the above, I have found many fusers where all of these items are fine (& some where techs have replaced some or all of them) & the fuser still frequently fails to pressurize or release, generating the L4-16 code. The ratchet system consists of 2 one way bearings, one in the ratchet arm, & another at the other end of the shaft, If the one in the arm fails, the shaft wont turn, but if the opposite one fails, the shaft will wobble back & forth until the machine times out & throws the code. I just (because I was tired of ordering fusers at far below their yield) pulled several "bad" fusers off of the shelf & ripped into them. After cleaning & "scotch-briting the shafts under both, I now have a few more "good" ones. Hope this saves some of you a few bucks.}

[planker101]

Re: MX-C311 - (etc) L4-16 Pressure Release issues still occurring after "updates"

Bringing back a super old post, haha. I just picked up one of these printers with the L4-16 error code for free. Based on what I have read it does need a new fuser (the visible gear takes a lot of effort to turn) however, the gear that turns the gear on the fuser is destroyed (most of the teeth are broken off). I can not seem to find a parts diagram or part number for this gear. It looks super easy to replace, if anyone can give me a part number I would be very appreciative.

Thanks,
Pat

PS: if anyone knows how to check toner levels I would appreciate that information as well.

[blackcat4866]

Re: MX-C311 - (etc) L4-16 Pressure Release issues still occurring after "updates"

How many teeth did it used to have?:

item 21 Gear 24T: NGERH1983FCZZ
item 23 Gear 30T: NGERH1982FCZZ

Coupler.JPG

=^..^=

[planker101]

Re: MX-C311 - (etc) L4-16 Pressure Release issues still occurring after "updates"

30t
found and ordered. Thank you bery much for your help!


If anyone knows how to check toner levels I'd still be interested in that information. I found a few user manuals online (one 800+ pages) and couldn't find any mention of it. I did not go through all 800 pages, but did try the sections that seemed relevent.

[ZOOTECH]

Re: MX-C311 - (etc) L4-16 Pressure Release issues still occurring after "updates"

30t
found and ordered. Thank you bery much for your help!


If anyone knows how to check toner levels I'd still be interested in that information. I found a few user manuals online (one 800+ pages) and couldn't find any mention of it. I did not go through all 800 pages, but did try the sections that seemed relevent.

Press and hold the 'Copy' mode button on the display - meters and toner level. I don't have access to the info on a machine level soft switch now, but will input on Monday, if someone answers first,

[ZOOTECH]

Re: MX-C311 - (etc) L4-16 Pressure Release issues still occurring after "updates"

Press and hold the 'Copy' mode button on the display - meters and toner level. I don't have access to the info on a machine level soft switch now, but will input on Monday, if someone answers first,

Simulation 55-3, switch 22, change bit 5 to a one - the toner remaining will show below the Status on the display.