It will not print and is reading 935.15 Service Printhead Error what do i need to do to fix this?

help in the link, but you may need service

https://www.google.com/search?q=HP+6600+print+head+cannot+move

..

Hi
"VHT leak detection error of left printhead,
in case of VHT exceeds rated value or falls
below the rated value."
So, error shows left printhead feeding voltage problem. It can be result of fault:
-printhead;
-Carriage relay board;
-flexible cable
-main controller.
Low speed of printing can be when printhead have overrange with it temperature; and when printing, printer makes a pauses to cold printhead. More information you can get from file PRINT INF under SERVICE MODE.
If you are a "ordinary user", looks like you can only try to change left printhead (success not guaranted!).

The printhead on a 6520 is not removable.

0xF1 means there is a paper jam.

Epson WorkForce WF 3520 All in One Printer

how did you fix this problem?

Replace with new printhead if the print head is past it's service life. If not past it's service life when you get that error message press the online button and it should print fine.

13,327.42: The Printhead reservoir thermistor returned a bad reading, or the
reading was corrupted by ESD.

Try :

• Are all components grounded properly?
• Run the Printhead Reservoir Temperatur test. Did the test pass? If not replace the Printhead.
• if it did pass check and reseat all wiring to the Printhead.
  Did this correct the problem? if not replace the print print head.
  
• 
  
• Go to www.iteminceonline.com and order a new one they will send you the instructions on step by step how to replace the print head and you can call them for free technical support. Goodluck
  

a 935 printhead error is a fatal error which means the scanner motor has failed to initialize. the term printhead is short for printhead scanner. this error can be caused by either the engine board or the scanner % wise 40%engine board 60% scanner ive done 120 repairs on lexmark laser for the last 7 years trust me one of these is the problem

Send it back. The printhead voltage is innnnn disorder. Netxt will be Error 41 (Every Error starting with 4 means probs with printhead and in 99,9% the head has to be changed and cant be fixed!)