Question about HP LaserJet 3100 All-In-One Printer
I need a free service manual for the hp laserjet 3100. I was changing the pickup roller and I had the white cable on of the side come unplugged and I can not find where the other end plugs in. Basically I need to plug the buried end of the cable in some how. If you see the diagram/instructions I am looking for in the manual, please let me know where. Thanks
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Jan 29, 2014 | HP LaserJet P2015 Printer
Jams in tray 2
Table 7-10 Causes of tray 2 jams
The feed or separation rollers are dirty, worn, or damaged. Clean the rollers. If they are dirty after cleaning, or if they are
worn or damaged, replace the rollers.
The pickup roller is worn or damaged. Replace the pickup roller.
The tray 2 paper pickup assembly drive gears are damaged
or the assembly is defective.
Check the drive gears in the paper pickup drive assembly.
Replace the pickup drive assembly if the gears are
damaged. See Paper-pickup drive assembly.
The tray 2 pickup solenoid (SL101) is damaged. 1 Disconnect the connector for the tray pickup solenoid
from the dc controller PCA (location J92).
2 Measure the resistance between the cable connectors.
3 If the measured resistance is not approximately
160 ohms for the HP LaserJet 4200/4300, or 110 ohms
for the HP LaserJet 4250/4350, replace the tray 2
The tray 2 lifter-drive assembly or the stack position
sensor (PS107) is defective.
Replace the lifter-drive assembly. See Tray 2 lifter-drive
assembly and/or Printer switches and sensors.
The dc controller PCA is defective. Replace the dc controller PCA. See Dc controller PCA.
Dirty, worn, or deformed pick-up roller, cassette separation
roller, and cassette feed roller.
Clean the rollers if they are dirty. Replace any worn or
deformed rollers. The cassette separation roller and the
cassette feed rollare are to be replaced together.
Damaged gears in the cassette pick-up drive unit. Move the gears in the cassette pick up drive unit. If the
gears are not rotating correctly, or are damaged or worn,
replace the cassette pick-up drive unit.
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I typically use "Chux" wipes and a shop-vac to start with. The wipes wipe up and REALLY HOLD the toner & paper particles, holds 'em tighter than a Hobo does a ham sandwich...
(I'll concede to the 'by-the-book' crowd that a specific (read EXPEN$IVE) type of vacuum cleaner is recommended by HP & most other service org's. I've used my shop-vac for 12+ years and have serviced thousands of HP LJ's, CLJ's, AiO's, MFM's, DJ's, OJ's, etc. I have never lost a single printer because I didn't use the 'right' type of vacuum...)
The Chux wipes are available from PartsNow, LLC; www.partsnow.com/.
They also carry maint kits for almost every HP printer made as well as Lexmark, Canon, Xerox, etc.
I use Cooper's Platen Cleaner (PartsNow) to clean the rollers using 2" x 2" gauze squares and nitrile gloves. Fedron works well too. HP's website mentions isopropyl alcohol and water as their recommended solvents. Use waht works best for you.
Having some 6-inch long cotton tipped applicators (wooden handled single ended Q-Tips...) helps tremendously.
In conjunction with the correct service manual, (in your case, Combined Service Manual for HP LaserJet 4L / ML & 4P / MPHP Publication Number C2005-90988, August 1993), a thorough cleaning is very easy for almost anyone to perform.
PartsNow and several other websites have HP Svc Man's online for free, Google around.
A legacy utility from HP that I've not yet tried can print and cycle cleaning sheets to clean mainly the fuser, but also claims to clean rollers as well. HP printer specialists will recognize 'cleaning sheets' from HP's newer models, built in to the menu structure. The utility will allow you to do the same for older (LJ 4, 5, & 6) printers. Find it at:
Another Combined Svc Man is available as well that covers:
HP LaserJet 4 / 4M
(C2001A / C2021A)
HP LaserJet 4 Plus / 4M Plus
(C2037A / C2039A)
HP LaserJet 5 / 5M / 5N
(C3916A / C3917A / C3952A)
HP Publication Number C3916-90984 (March 1996).
As far as Scheduled cleaning, the cleverly formatted (LOL) table below lists HP's recommended service intervals. Over the years, I've found that adhering to the schedule has reduced unplanned downtime by almost 80%!!
DESCRIPTION / QTY / EST. LIFE (pages) / REMARKS
1. Toner Cartridge / 1 / 6800 (note 1) / When print becomes faint, shake cartridge to distribute remaining toner.
2. MP (Tray 1) Pickup Roller Assembly / 1 / 200,000 / Replace roller and separation pad together.
3. PC (Tray 2) Pickup Roller / 1 / 200,000 / Look for glazing and cracks.
4. Separation Pad / 1 / 200,000 / Look for glazing and grooves. Replace together with Pickup Rollers.
5. Transfer Charging Roller / 1 / 200,000 / May affect print quality and/or paper jams.
6. Fuser Assembly (115 V, 50/60 Hz) / 1 / 200,000 / May affect print quality and/or paper jams. Look for marks on rollers.
6a. Fuser Assembly (220 V, 50 Hz) / 1 / 200,000
7. LC (Tray 3) Pickup Roller / 1 / 200,000 / Look for glazing and grooves. Replace the Separation Pad.
8. Exhaust Fan / 1 / 25,000 hrs. (I've only had to replace one in 12 yrs...)
Note 1: The estimated Toner Cartridge life is based on A4 or letter size prints with an average of 5% toner coverage, and with the density setting at 3.
Best of luck,
Oct 16, 2007 | HP LaserJet 4 plus Printer
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