Canon PC920 Sheet feader won't feed from tray

[Michael_V]

Hi, My Church school has a Canon PC920. It will process a manually fed cut sheet, but will not take the sheets from the paper tray. I have taken the machine apart, cleaned the white gear assembly (the "clutch" for the larger gear, which is just a spring, does not seem to keep the gear from spinning as I can turn the gear in the other direction against the clutch) and can manually turn the feed rollers to feed a sheet of paper. The solenoids are working properly. Any advice to help me get the unit going again would be greatly appreciated.

I am no longer a tech, but was certified on HP, OCE and Xerox wide format machines. I started as a tech when they used ammonia to make blue-line prints, a looong time ago. Oddly enough the manufacturer's name was Blu-ray.

Thanks,
Michael

[teckat]

Hi, My Church school has a Canon PC920. It will process a manually fed cut sheet, but will not take the sheets from the paper tray. I have taken the machine apart, cleaned the white gear assembly (the "clutch" for the larger gear, which is just a spring, does not seem to keep the gear from spinning as I can turn the gear in the other direction against the clutch) and can manually turn the feed rollers to feed a sheet of paper. The solenoids are working properly. Any advice to help me get the unit going again would be greatly appreciated.

I am no longer a tech, but was certified on HP, OCE and Xerox wide format machines. I started as a tech when they used ammonia to make blue-line prints, a looong time ago. Oddly enough the manufacturer's name was Blu-ray.

Thanks,
Michael

Canon PC920 Supplies and Parts (All)

Canon PC920 Clutches
lube collar spring goes on / if there is one/should be a one way clutch ???
may have a cracked paper feed sensor arm
clutch feed lever position

how are the feed rollers

FB2-5163-000 spring
H0025.jpg

FS5-0883-000 34t gear clutch
H0670.jpg

check this gear below for cracks
Gear 25T Drives Paper Feed Roller
E3881.jpg

make sure small spring is not missing on gear below
E4702.jpg

[teckat]

(Multifeeder type)

pu1.JPG

[Michael_V]

Gentlemen,
Thanks for the timely responses.
I will check further tomorrow. The clutch spring seems to be in tact. I sanded the metal ring with some fine (600 grit wet or dry) sandpaper as it seemed somewhat worn after I cleaned the grease off, but when I installed it, the clutch seemed to slip more so I hit it with some 180 grit. I don't think I took enough off to decrease the diameter of the ring, but I may have.
The feed rollers look OK. The thing grinds a little because the feed roller gear comes up just shy of the drive gear. It'll work if I just persuade it a little, then the feed rollers turn ok and the paper comes up out of the tray. The spring on the feed roller shaft which pulls the shaft looks ok as well.

Thanks again,
Michael

[teckat]

never sand the inside of a one way spring or the gear hub it sits on/ it is that gear hub & inside of spring that wears down/ i would order one of each/ & lightly use some silicone oil on inside of spring/ do not use any 3in1 oil /or household oil on spring-

FB2-5163-000 spring
FS5-0883-000 34t gear clutch

[Michael_V]

Thanks teckat,

I'll post the results after I replace the parts you recommended.

[Michael_V]

I installed the parts but put the new spring in the feed clutch and replaced the 32t gear. The rubber on one of the feed rollers was pulled out on 1 end, possibly due to the tray being removed during a paper jamb. I pushed the rubber back into place. Now the feed rollers turn properly (when there is no tray), however they do not have enough umph to pull out a piece of paper from the tray. I have ordered a ring rachet and another spring. How hard is it or is it even possible to take the hub off and put it on another gear? One of the 3 pieces I wanted to replace (the feed clutch) is unfortunately NLA.

[teckat]

I installed the parts but put the new spring in the feed clutch and replaced the 32t gear. The rubber on one of the feed rollers was pulled out on 1 end, possibly due to the tray being removed during a paper jamb. I pushed the rubber back into place. Now the feed rollers turn properly (when there is no tray), however they do not have enough umph to pull out a piece of paper from the tray. I have ordered a ring rachet and another spring. How hard is it or is it even possible to take the hub off and put it on another gear? One of the 3 pieces I wanted to replace (the feed clutch) is unfortunately NLA.

what part # is not available ???

did u check SLI
how old is the rubber rollers/ are they skipping over the paper

never tried it before, the gear clutch hub must match the spring

[Michael_V]

Pardon my ignorance, what's SLI? The rubber rollers are original. I can see the feed roller turning (I took the cover off from the vertical transport area and bypassed a sensor) when there is no paper tray. When I put the paper tray back in, the rollers turn just enough to contact the paper and then stop.
The tech at Precision Roller does not give out the OEM #'s, at least to me. PR has their own numbering system which they use when parts are ordered, to keep the OEM #'s from being used.
According to him, there is a gear, ring rachet and spring. The gear and the spring are NLA. That's why I ordered another FB2-5163-000 spring and the ring rachet.

[teckat]

Pardon my ignorance, what's SLI? The rubber rollers are original. I can see the feed roller turning (I took the cover off from the vertical transport area and bypassed a sensor) when there is no paper tray. When I put the paper tray back in, the rollers turn just enough to contact the paper and then stop.
The tech at Precision Roller does not give out the OEM #'s, at least to me. PR has their own numbering system which they use when parts are ordered, to keep the OEM #'s from being used.
According to him, there is a gear, ring rachet and spring. The gear and the spring are NLA. That's why I ordered another FB2-5163-000 spring and the ring rachet.

do u see that picture above with the SL1= Solenoid 1/

that controls the release and gear drive/ if it slips back down while the pic up roller turns, u will lose the drive to continue pick up

[Michael_V]

teckat,
Here's what I found.
Looking into the machine during the pick up cycle, I can see all the rollers and solenoids operating as (I think) they should. If I drag my finger on any of the gears that transfer the rotation energy to the feed rollers, the gears on the feed roller side of the pickup clutch stop turning . This is with a minimum amount of force. It seems that the pickup clutch is slipping. I cleaned all the excess grease from the hub and spring inside, but it didn't seem to help. I was thinking if I could heat up the hub enough to remove it and not distort it or the gear, I may be able to swap it with the hub from the 34t gear.
I know I'm grasping at straws, but "I'm on a mission from God" so I'm willing to try anything to get this going again.

[teckat]

teckat,
Here's what I found.
Looking into the machine during the pick up cycle, I can see all the rollers and solenoids operating as (I think) they should. If I drag my finger on any of the gears that transfer the rotation energy to the feed rollers, the gears on the feed roller side of the pickup clutch stop turning . This is with a minimum amount of force. It seems that the pickup clutch is slipping. I cleaned all the excess grease from the hub and spring inside, but it didn't seem to help. I was thinking if I could heat up the hub enough to remove it and not distort it or the gear, I may be able to swap it with the hub from the 34t gear.
I know I'm grasping at straws, but "I'm on a mission from God" so I'm willing to try anything to get this going again.

Check your PM
PC1.JPGPC.JPG

[Michael_V]

Well I finally got the right part from world of fax. PC920 Clutch.jpg
They sent me the wrong part and won't take it back because I chose it from a parts breakdown they faxed me (which was for a similar, but wrong machine). I installed the part and made a few copies. Everything seemed OK, except the registration was slightly off, so I put the machine back together. Now it only copies the first half of the original on the trailing half of the copy paper. It will copy the whole page using the manual feed section, if I slip a second sheet overlapping the first. Back to the drawing board. I tried adjusting the registration settings, but it's more than that. I'll check the sensors and post my findings. Copy quality is pretty good with new cartridge. It was too dense actually, so I'll adjust it once I get the registration issue resolved.

[teckat]

sounds like a reg.roller timing issue
From the cassette, multifeeder, or single-feeder, copy paper is picked up and is controlled by the registration roller so that its leading edge will match the leading edge of the image on the photosensitive drum; it is then moved through the transfer,
separation, feeding, and fixing assemblies to reach the copy tray.

The machine has three types of pickup rollers, i.e., cassette pickup roller, multifeeder pickup roller, and single-feeder pickup roller, and each of these rollers are operated by the drive of the main motor switched by means of a gear unit. (In other words, only one roller is driven at any one time.)

Controlling the Registration Roller
The registration roller is controlled by a spring clutch, control ring, pre-registration roller paper sensor (Q751), and registration clutch solenoid (SL2).
The microprocessor on the DC controller PCB turns on the registration clutch solenoid at a specific timing in response to the paper detection signal from the pre-registration roller paper sensor.
When the registration clutch solenoid turns on, the claw will leave the control ring, and the drive of the main motor will reach the registration roller to move the copy paper to the photosensitive drum.
reg.JPG


The machine is equipped with four sensors used to monitor the movement of copy paper.
PS3=Delivery sensor
PS4=Vertical path roller paper sensor
PS5=Single-feeder paper sensor>=Single-feeder model only
Q751=Pre-registration roller paper sensor

Check the registration clutch.
Check the pickup roller, pickup clutch, and cassette position

check that Cassette spring force

[Michael_V]

OK, OK, I'm stupid. Or at least I was stupid when I put the gear assembly of the registration roller back together. I checked and re-checked everything. FINALLY, I noticed the control ring was turned around. I put it in the wrong way! Dumb dumb. I turned it back around and low and behold 5 beau-ti-ful copies came out of the machine. I just have to tweak the registration adjustments to get the lead edge where I want it to be. Well it only took a month, but I got it, by George I've got it.

Huge thank you, a gold star for patience and my respect go to teckat. Thanks for all your assistance. Merry Christmas from Woostah, Massachusetts
Thank you to all the people of copytechnet.com. I could not have done this with your forum