REPAIRING AND NOT THROWING AWAY

Richtige Fernseher haben Röhren!

Richtige Fernseher haben Röhren!

In Brief: On this site you will find pictures and technical information about Service Modes, Circuit Diagrams, Firmware Update procedure, Disassemble procedure, Universal remote control set-up codes, Troubleshooting and more....

If you go into the profession, you will obtain or have access to a variety of tech tips databases HERE IT IS Master Electronics Repair !.

These are an excellent investment where the saying: 'time-is-money' rules. However, to learn, you need to develop a general troubleshooting approach - a logical, methodical, method of narrowing down the problem. A tech tip database might suggest: 'Replace C536' for a particular symptom. This is good advice for a specific problem on one model. However, what you really want to understand is why C536 was the cause and how to pinpoint the culprit in general even if you don't have a service manual or schematic and your tech tip database doesn't have an entry for your sick TV or VCR.

While schematics are nice, you won't always have them or be able to justify the purchase for a one-of repair. Therefore, in many cases, some reverse engineering will be necessary. The time will be well spent since even if you don't see another instance of the same model in your entire lifetime, you will have learned something in the process that can be applied to other equipment problems.
As always, when you get stuck, checking out a tech-tips database may quickly identify your problem and solution.In that case, you can greatly simplify your troubleshooting or at least confirm a diagnosis before ordering parts.

Happy repairing!
Today, the West is headed for the abyss. For the ultimate fate of our disposable society is for that society itself to be disposed of. And this will happen sooner, rather than later.

How to use the site:

- If you landed here via any Search Engine, you will get what you searched for and you can search more using the search this blog feature provided by Google. You can visit more posts scrolling the left blog archive of all posts of the month/year,
or you can click on the main photo-page to start from the main page. Doing so it starts from the most recent post to the older post simple clicking on the Older Post button on the bottom of each page after reading , post after post.

You can even visit all posts, time to time, when reaching the bottom end of each page and click on the Older Post button.

- If you arrived here at the main page via bookmark you can visit all the site scrolling the left blog archive of all posts of the month/year pointing were you want , or more simple You can even visit all blog posts, from newer to older, clicking at the end of each bottom page on the Older Post button.
So you can see all the blog/site content surfing all pages in it.

- The search this blog feature provided by Google is a real search engine. If you're pointing particular things it will search IT for you; or you can place a brand name in the search query at your choice and visit all results page by page. It's useful since the content of the site is very large.

Note that if you don't find what you searched for, try it after a period of time; the site is a never ending job !

..............The bitterness of poor quality is remembered long after the sweetness of todays funny gadgets low price has faded from memory........ . . . . . .....
Don't forget the past, the end of the world is upon us! Pretty soon it will all turn to dust!

©2010, 2011, 2012, 2013, 2014 Frank Sharp - You do not have permission to copy photos and words from this blog, and any content may be never used it for auctions or commercial purposes, however feel free to post anything you see here with a courtesy link back, btw a link to the original post here , is mandatory.
All posts are presented here for informative, historical and educative purposes as applicable within fair use. NOTHING HERE IS FOR SALE !

Tuesday 2 April 2019

HP8500 – 8550 PRINTER FAMILY HP COLOR LASER-JET CLEANING PROCEDURE

HP COLOR LASER-JET CLEANING PROCEDURE- 8500 – 8550 Printer Family

Cleaning procedure that user can do.
CLEANING POST CHARGER
Clean the post charger on the transfer drum if there are light streaks in halftone areas.
To clean the post charger
1 Open the right upper door.
2 Locate the post charger unit cleaner next to the transfer drum handle.
3 Slide the post charger unit cleaner across the bar several times.
4 Push the cleaner back into place.
5 Close the right upper door.
Cleaning the density sensor
Clean the density sensor after replacing the imaging drum and when printed colors are inaccurate.
To clean the density sensor and erase lamp.
1 Open the right upper door.
2 On the inside of the door, locate the density sensor and the density sensor brush. Use the brush to brush off toner particles from the density sensor and the erase lamp.  Note:  You can also use a hand wipe to clean the density sensor. To prevent scratches on the sensor, do not use any paper products, such as tissue or paper towels, to clean the sensor.
3 Replace the brush.
4 Close the right upper door.
Cleaning the transfer charger
Clean the transfer charger when irregular wavy patterns appear in solid backgrounds.
To clean the transfer charger
1 Open the front door.
2 Find the knob below the transfer charger.
3 Pull the knob out and push it back in.
4 Close the front door.
Cleaning the toner catch tray
The toner catch tray will not normally have much toner in it. Clean the toner catch tray before moving the printer to another location or when performing routine maintenance at the customer site.
1 Open the front door.
2 Remove the toner catch tray cover by releasing the tab on the right side of the cover with a small screwdriver.
3 Remove the toner catch tray.
4 Vacuum toner out of the tray, or use a hand wipe to clean the tray if there is a small amount of toner in the tray.
WARNING:  Do not use a regular vacuum to clean up toner. The toner can penetrate the vacuum bag, and toner might be harmful if inhaled.
5 Re-install the toner catch tray and cover, and close the front door.
Cleaning the toner catch tray
The toner catch tray will not normally have much toner in it. Clean the toner catch tray before moving the printer to another location or when performing routine maintenance at the customer site.
1 Open the front door.
2 Remove the toner catch tray cover by releasing the tab on the right side of the cover with a small screwdriver.
3 Remove the toner catch tray.
4 Vacuum toner out of the tray, or use a hand wipe to clean the tray if there is a small amount of toner in the tray.
WARNING:  Do not use a regular vacuum to clean up toner. The toner can penetrate the vacuum bag, and toner might be harmful if inhaled.
5 Reinstall the toner catch tray and cover, and close the front door.