Xerox Phaser 7700DN: Yellow prints blotchy

Most likely the cyan ink is burnt. If the ink sticks are left unused (printing more black than color, this will happen.

Print the test pages for PQ troubleshooting from the control panel and examine each print. Cyan will probably have very dark streaks down the page, magenta should look normal, and yellow also will have dark stripes. You need to replace this burnt ink, and the only way is to print. From within paint (or similar accessory in other OS) Create a full page of cyan, and print about 100 - 200 pages, or until the cyan starts to clear up. Yes it is a waste, but much cheaper than a print head, Do this for yellow as well.

Your machine uses solid ink wax blocks. So no calibration is necessary. Does the self test print look good. I suspected not.
Check out the Xerox.com website. It could be a problem as you machine is no longer sold.
Sorry.

try to clean the laserwindows of the printer.

the problem is not with the printer but it is with the ink that might be damaged, this is located inside the printer

This is a faily common problem with the Phaser 7700. The yellow developer needs to be replaced. Parts at: http://www.lpscomputer.com/p-3063-1-116-1115-00-developer-housing.aspx The manual can be downloaded from: www.lpscomputer.com/ec/Phaser_7700_Service_Manual.pdf

Hi armaskopljak:
You have replaced the toner cartridge but you still have to replace the imaging unit which is the drom that the toner cartridge attaches to.
Toner Cartridge OK, Low, Empty When 15,000
(high-capacity cartridge) or
7,500 (standard-capacity
cartridge) pages are
printed (5% print density).
Imaging Units At/Near end-of-life When 30,000 pages are
printed out or when the
pixel counts are
exceeded.
A fuse in the new
imaging unit will blow
upon installation,
resetting the counter.
Verify color calibration. Clean lenses.

Xerox Part Numbers

Toner Cartridges:
Standard Capacity Yellow 016-1975-00
Standard Capacity Magenta 016-1974-00
‘ Standard Capacity Cyan 016-1973-00
Standard Capacity Black 016-1976-00
High Capacity Yellow 016-1979-00
High Capacity Magenta 016-1978-00
High Capacity Cyan 016-1977-00
High Capacity Black 016-1980-00

Imaging Units
Cyan 016-1993-00
Magenta 016-1994-00
Yellow 016-1995-00
Black 016-1996-00
Hope this helps

What you are describing is a bad print head. You can try running the eliminate light stripes several times, and jet substitution, but most likely the print head will have to be replaced to remedy your problem.
You can try googling. Phaser printer print heads or phaser printheads.
There seems to be a secondary market appearing for those print heads. I can tell you from Xerox, if you have no maintenance agreement, they cost $750 per print head.
Honestly, having worked on about every type of color printer known to man, the new solid ink phaser printers, produce a dry ink image of 2400 x 2400 dpi with ink particles that align end to end. The resolution of those printers are remarkable and can be purchased for less than the price of one of those new print heads.
Now for reliable, albeit somewhat not as sharp a color image, but still exceptional, you really can not beat an HP.
The ink stick technology really no longer has the color vividness advantage it initially had. The inks that align end to end, have ended that advantage and are sure a lot cheaper to operate per page.

Hi,
Use the following procedure to troubleshoot Error Codes 009-910 through 009-913 
1. Check the installation of the Print Cartridge. 2. Clear the Tech Rep Fault for errors 009-910 through 009-913 (see instructions below). 3. Try changing the indicated Print Cartridge. 4. Check for an open wire or poor contact between the Print Cartridge and the Engine Control Board. a. Yellow, J-151 to J-405 b. Magenta, J-152 to J-405 c. Cyan, J-153 to J-405 d. Black, J-154 to J-405 5. Replace the engine control board
NOTE:  Before troubleshooting for an open circuit (Step 4) or replacing the Engine Control Board (Step 5), clear the Tech Rep Fault for any of these codes first using the following steps: 1. Enter Service Diagnostics. 2. Highlight NVRAM Access and press OK. 3. Highlight Clear Tech Rep Faults and press OK. 4. Highlight link codes 009-910 through 009-913 and press OK.

Hope my info solves your problem..... Thanx for using fixya......

You need a cyan developer housing.

Do you have the operators manual? Run it through a cleaning cycle. Also Xerox's website will guide you through some maintenance steps. If you are using generic wax, you may have clogged the jets.

I’m happy to help further over the phone at https://www.6ya.com/expert/jayw_0e86fb055a7b73de