Color LaserJet 8500, 8550 Printers Family
Service Manual

$9.99
Color LaserJet 8500, 8550 Printers Family <br> Service Manual
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Color LaserJet 8500/8550 Printer Family Service Manual

This manual contains the necessary information to service the Color LaserJet 8500/8550
Printer Family Printers

Contents:

1 Product Information
Introduction
Printer features
Specifications
Site requirements
Media requirements
Identification (model and serial numbers)
Printer Information
Safety information

2 Service approach
Chapter contents
Introduction
Parts and supplies
Ordering
Technical assistance
Warranty

3 Operational overview
Chapter contents
Verifying package contents
Verifying the cables are installed
Connecting the printer to the network
Changing the printer control panel overlay
Printer control panel layout
Menu maps
Selecting the display language
Installing the consumables
Configuring input trays
Verifying the printer is installed correctly
Verifying DIMM installation
Duplex registration (HP Color LaserJet 8550)
Booklet printing
HP TonerGauge (HP Color LaserJet 8550)

4 Printer maintenance
Chapter contents
Cleaning procedures
Printer consumables

5 Theory of operation
Chapter contents
Introduction
Color theory
Image formation
Consumable detection mechanisms
Electrical systems
Mechanical systems
Paper path
Printer timing
EPH controller board
Duplexer
2,000-sheet input unit
Multi-bin mailbox
3,000-sheet stapler/stacker

6 Removal and replacement
Chapter contents
Introduction
Maintenance units
Doors and covers
Top assemblies
Front assemblies
Left assemblies
Right assemblies
Rear assemblies
2,000-sheet input unit
Multi-bin mailbox
3,000-sheet stapler/stacker and 3,000-sheet stacker

7 Troubleshooting
Chapter contents
Pre-troubleshooting checklist
Printer message troubleshooting
Aids to troubleshooting
Paper path troubleshooting
Image formation troubleshooting
Image defects troubleshooting
Color balance adjustment
Repetitive defects troubleshooting
Repetitive defects troubleshooting
2,000-sheet input unit troubleshooting
Multi-bin mailbox troubleshooting
3,000-sheet stapler/stacker troubleshooting
Communications troubleshooting
Diagrams

8 Parts and diagrams
Chapter contents
Overview
Ordering parts
Illustrations and parts lists
Numerical parts list
Alphabetical parts list
Index

FORMAT: High resolution PDF document
ZIP archive: 135 497 kB

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We are in business since 2002 and do our best to give our customers perfect service!

  MIZIKE G. 2025-11-14 16:23:29  
  11-14-2025 - I JUST USED THE DOWNLOADED UTLITY PROGRAM AND BOUGHT THEIR $9.99 CODE FOR PURPOSE OF RESETTING THE INK WASTE COUNTER BULLSHIT ( EPSON ET-4550 SEVERAL YEARS OLD ) WHICH I NEVER HEARD OF UNTIL LAST WEEK WHEN THE PRINTER WOULDN'T DO ANYTHING BUT TELL ME TO CONTACT EPSON. LOL- NOPE - CHAT GTP GAVE ME THE INFO FROM HERE, USED IT AND WORKED - TOOK ABOUT 5 MINUTES - ( I HOWEVER - DIDNT ACTUALLY CLEAN OR EMPTY THE INK WASTE OR WHATEVER - IM HOPING FOR THE BEST, ASSUMING ITS OLD ENOUGH THAT IT HAS DRYED ON ITS OWN. - THIS PART ISNT RECCOMENDED TO MY UNDERSTANDING - BUT ILL FIND OUT I SUPPOSE) BUT LONG STORY SHORT - EAST TO USE DOWNLOADED UTILITY, AND RESET KEY FOR 10 BUCKS WORKED - ABOUT 5 MINUTES OR LESS PROCESS. REAL SHIT - MIZIKE
  Johann van Heerden 2020-11-09 11:21:16  
  Thanks for realy very best helping to reset the Printer Counters Best regards, peter
  Tomas Jomad 2014-05-21 14:00:25  
  Just wanted to write and THANK YOU for making such GREAT products.

I just reset my Epson 1430 printer. I\'m using it with bulk pigmented ink...and a custom color profile. I love it...and thanks to you I\'ll be able to get several more years out of it.
Best regards.Tomas Jomad
  svenn svenson 2012-03-05 19:14:52  
  THIS IS A MUST HAVE UTILITY This reset key worked perfectly for my Epson Artisan 800. I tried the Epson reset utility (free from Epson) many times. It would "reset" the counter to "40%", then upon turning printer off - on, it would revert to "0%" with the error message that the inkpads had reached their end of life. This also happened whenever I performed a head cleaning. For those of us who use a CIS (I am not affiliated with inkproducts.com - but have been using their CIS for a couple of years and LOVE the quality and service) - it is imperative to be able to reset this waste ink counter. I should also add, the waste ink pad issue is real - don't expect to simply reset the waste ink counter and go happily on your printing way - you will have a disaster and you will experience frequent head clogging. You MUST use an external waste ink disposal system - either make your own for $5 or buy one. THIS + the reset utility is what enables you to get the true value from your CIS-modified printer.
  Alexey Scherbenko 2020-01-15 16:42:26  
  HELLO!!! Today I bought a key for updating the firmware of my SC P-600 printer. After activ ating the key, WIC started updating the firmware and the message "ROM is not writeable" popped up on the printer screen. Now when I power on printer - I get "Recovery mode". What can I do now?!

======Answer========

Please read how easily and quickly it can be solved -
www.wic.support/epson-wf-3720-stuck-in-recovery-mode-quick-and-esy-solution/
  sabir ali 2018-05-01 02:18:31  
  The procedure was easy. I used the trial version, and my printer is now working. I will buy the reset key next time. I recommend this fix. Thank you....
  Barbara Kocjančič 2010-08-12 10:00:08  
  This is fantastic!!!!! It works fine on my epson px710w!!! Just 3clicks and it done!! Thanks so much!!!
  Schaun Smuts 2015-10-23 11:16:13  
  I was amazed how easy that was. I was in doubt that this simple download would work... with my heart racing!

I entered the key,and there it was, all fixed.

2manuals, I must say, what you said it would do, it did, and I\'m so relieved and happy, and can work again.

The success of this has made me want to write a review on your product right away.

Thank you so much

Robert Dorsey President/CEO Cabin Watch Fine Time Wear
Write review