Replacement printhead Printhead requires replacing due to shortcircuit on circuit board

You are correct, Below is that section from the manual. Before you follow this, i've found in the past that the cable connector is not seated properly on the rip board, so check this first.
If you require any of the instructions on replacing the printhead or board let me know.


Yellow Printhead Lost Hsync
Check for the correct installation of the all the cables to the RIP
Board assembly and to the Printhead assembly; J2, J3, and J4 on
the RIP Board. Go to "RIP Board" on page 5-11. If the cables are
connected correctly to the RIP Board and to the Printhead
assembly, replace the following FRU:
"RIP Board" on page 4-11 If this does not fix the problem replace:
Yellow Printhead Assembly - Go to "Printheads" on page 4-33.
Note: Whenever a printhead assembly is replaced, it is necessary
to perform the "Printhead Adjustments" on page 4-1.

Epson printer Support - Drivers, FAQs, Troubleshooting, Technical Support, Documents & Manuals for Epson Products - Epson America, Inc. if you are face any problem you can visit our site. https://www.epsonprintersupport247.com/fix-epson-printer-error-code-031008/

This error usualy relate to internal software, and internal hardware communications.
Check cabling and connectors to the PH (PrintHead) unit and the printed circuit board (PWB-A).
If they are OK, the change the PH (PrintHead) unit or the PWB-A

Most likely a PH unit (laser scanner) failure...

This will need a service technician to repair, as after replacing the PH unit, there are several adjustments that are required to be done,

20 times Other hardware error [6500] - Logic board ***'y (QM2-2670)*1

Its the small circuit board next to the carriage unit

You can get one for about $30 from this company web site.

www.euro-parts.it/download/slowmover_oct-2008.xls

You probably have to contact them directly to get your exact circuit board.

Hi,

It's likely that your printheads have just been knocked about a bit when you cleared the jam and all you need to do is to remove and then reseat them again properly...

Try this:

• Open the main printer lid (not the scanner) :-)
• wait for the printer LED to show the message about replacing printheads
• Press and hold the OK button for 5+ seconds.
• Wait for the printheads to move into the replacement position and wait 5 seconds more to be sure the printer isn't messing with you as sometimes it likes to move a bit more before it settles.
• Lift the blue lid clear
• Remove the printheads one at a time and check for any ink smear on the back part where a circuit board sits... This may need some gentle cleaning with a cotton bud
• Check the contact circuit board in the actual printhead carriage (the bit where the printheads actually sit normally) and clean these with a cotton bud if these have become soiled
• Replace the printheads in the correct slots and carefully push them into position
• Close the blue lid and then close the printer lid

If the printheads are ok you should find that this will solve the problem and re-establish connection with the printer, cancelling the error. If not, it's possible the printhead is damaged but I'd give HP support a call first and request a replacement if you can (check the warranty on the printhead - they have this printed on them).

Hope this helps.

93x Printhead Error
Each printhead error has its own error code number. The error codes and their respective meanings are listed below, together with some actions you can take to resolve the problem. 


ALL printhead errors:
If this is the first time the error has occurred, try turning the printer off and on. 
Let it sit turned off for at least 20 seconds before powering it back on. 
If powering off and on the printer clears the error, please continue using the printer but watch it to see if any printhead errors return. 
If your printer continues to display a Printhead Error message, make sure it is plugged straight to the wall and not through a surge device or power strip. Power strips and uninterrupted power supplies can cause a low amperage problem in your printer. This can trigger a printhead error even if the printer has worked on this surge device for months. 
  
If the printer continues to post a 930 Printhead Error, it thinks the wrong printhead unit is installed. 
  
If the printer was recently serviced, make sure the correct parts were used. This is especially true if the parts replaced were either the printhead unit or the printer's engine/system board. It is in one of these two parts that the printer is detecting the problem. Note: If you are the person repairing such a printer, please be aware that parts from different, though similar, printer models may not be compatible with this printer. Also make sure to check the laser cable going from the printer's engine board to the printhead unit, as it reads that signal. 
If the printer was not recently serviced before this error occurred and powering the printer off and on does not help, the printhead unit and possibly the laser cable or the engine/system board to this printer may need to be replaced. 
 
If the printer continues to post a 931 Printhead Error, it thinks there is an error in the signal going to the laser or the Hsync part of the printhead assembly. 
If the printer continues to post a 932 Printhead Error, it thinks there is an Hsync error occurring in the printhead assembly. 
If the printer continues to post a 933 Printhead Error, it thinks there is a failure in either the Hsync signal or with the mirror motor unit of the printhead.  
If the printer continues to post a 934 Printhead Error, it thinks there is a "lock" failure with the mirror motor assembly within the printhead assembly. 
If the printer continues to post a 935 Printhead Error, it thinks the mirror motor unit within the printhead unit cannot reach its operating speed.
 
If powering the printer off and on does not clear any of these errors and it is already connected directly to the wall, your printer may require service. It could have a defective printhead unit or there might be a problem with the engine board or one of the printhead cables. Note: If you are the person repairing such a printer, check all of the cables going from the printer's engine board to the printhead unit for any damage. Also check the continuity across these cables. 


Source: Lexmark KnowledgeBase

Things to check:

1. Move the pressure arm further towards the outside of the printhead. Adjust if needed using only the minimum pressure required in order to achieve uniform print quality.

2. Inspect the printhead to ensure it has properly engaged the alignment pins. I have had after-market printheads that did not line up correctly and required "surgery" to make them properly seat on the mounting pins.

3. Check for worn platen roller bearings. If they're are sufficiently worn, one side of the platen roller will be slightly lower than the other.

4. Consider replacing the platen roller. They do wear out and require replacement. Zebra part number 40038M IIRC.

5. Check the printhead parallelism adjustment. The procedure is in the maintenance manual.

Steve

Basically this is a Lexmark printer.

Try these if no result replace printhead ( can be expensive will try to find the comparable to the lexmark.

93x Printhead Error

Each printhead error has its own error code number. The error codes and their respective meanings are listed below, together with some actions you can take to resolve the problem.

ALL printhead errors:

1. If this is the first time the error has occurred, try turning the printer off and on.
2. Let it sit turned off for at least 20 seconds before powering it back on.
3. If powering off and on the printer clears the error, please continue using the printer but watch it to see if any printhead errors return.
4. If your printer continues to display a Printhead Error message, make sure it is plugged straight to the wall and not through a surge device or power strip. Power strips and uninterrupted power supplies can cause a low amperage problem in your printer. This can trigger a printhead error even if the printer has worked on this surge device for months.
   
   • If the printer continues to post a 930 Printhead Error, it thinks the wrong printhead unit is installed.
     
     • If the printer was recently serviced, make sure the correct parts were used. This is especially true if the parts replaced were either the printhead unit or the printer's engine/system board. It is in one of these two parts that the printer is detecting the problem. Note: If you are the person repairing such a printer, please be aware that parts from different, though similar, printer models may not be compatible with this printer. Also make sure to check the laser cable going from the printer's engine board to the printhead unit, as it reads that signal.
     • If the printer was not recently serviced before this error occurred and powering the printer off and on does not help, the printhead unit and possibly the laser cable or the engine/system board to this printer may need to be replaced.
       
   • If the printer continues to post a 931 Printhead Error, it thinks there is an error in the signal going to the laser or the Hsync part of the printhead assembly.
   • If the printer continues to post a 932 Printhead Error, it thinks there is an Hsync error occurring in the printhead assembly.
   • If the printer continues to post a 933 Printhead Error, it thinks there is a failure in either the Hsync signal or with the mirror motor unit of the printhead.
   • If the printer continues to post a 934 Printhead Error, it thinks there is a "lock" failure with the mirror motor assembly within the printhead assembly.
   • If the printer continues to post a 935 Printhead Error, it thinks the mirror motor unit within the printhead unit cannot reach its operating speed.
     
5. If powering the printer off and on does not clear any of these errors and it is already connected directly to the wall, your printer may require service. It could have a defective printhead unit or there might be a problem with the engine board or one of the printhead cables. Note: If you are the person repairing such a printer, check all of the cables going from the printer's engine board to the printhead unit for any damage. Also check the continuity across these cables.

I guess you're getting an error message which is normally one of the below (causes underneath)

Error Code 931
No first HYSNC Signal
Error Code 932
Lost HYSNC =

These errors usually indicate a
failure in the HYSNC signal to the
printhead. Check the continuity of
the cables connected to J3 and J8
on the engine board. If incorrect,
replace the defective cable. The
voltage at J8-4 measures
approximately +5 V dc. If incorrect,
replace the engine board. The
voltage at J3-7 measures
approximately +24 V dc. If incorrect,
replace the engine board. If correct,
replace the printhead assembly.


Error Code 934
Mirror Motor Lost Lock
Error Code 935
Mirror Motor unable to
reach operating speed =

These error codes indicate a
problem with the mirror motor circuit
in the printhead assembly or the
mirror motor cable to the engine
board cable or engine board
assembly. Check the continuity of
the mirror motor cable connected to
J3 on the engine board. If incorrect,
replace the cable. The voltage at
J3-7 measures approximately
+24 V dc. If incorrect, replace the
engine board. If correct, replace the
FRUs in the following order:
engine board
printhead assembly

You are correct, Below is that section from the manual. Before you follow this, i've found in the past that the cable connector is not seated properly on the rip board, so check this first.
If you require any of the instructions on replacing the printhead or board let me know.


Yellow Printhead Lost Hsync
Check for the correct installation of the all the cables to the RIP
Board assembly and to the Printhead assembly; J2, J3, and J4 on
the RIP Board. Go to “RIP Board” on page 5-11. If the cables are
connected correctly to the RIP Board and to the Printhead
assembly, replace the following FRU:
“RIP Board” on page 4-11
If this does not fix the problem replace:
Yellow Printhead Assembly - Go to “Printheads” on page 4-33.
Note: Whenever a printhead assembly is replaced, it is necessary
to perform the “Printhead Adjustments” on page 4-1.