Question about HP LaserJet 2420n Printer

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2420n I recently tried to install a maint kit for a Laserjet 2420n. This however came with no instructions. When it came to replacing the Tray 1 Separation Pad & Pickup Roller, it came as a complete part, including the bar that the Pickup roller is attached to. Without the instructions I stupidly tried to change the whole thing and broke one of the white plastic pieces that are attached to the bar. this white plastic piece, I believe, detects how much paper is in the tray. I cannot seem to get this bar out to change the broken piece. Anyone got any instructions on how to do this?

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Posted on Apr 04, 2008

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Proper Manual cleaning


 

 

Hi Gidget,

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:

http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?lang=en&cc=us&taskId=125&prodSeriesId=25484&prodTypeId=18972&prodSeriesId=25484&objectID=bpl03846

 

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,

Foxfur

Oct 16, 2007 | HP LaserJet 4 plus Printer

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