I have replace the printer heads on my printer, only to have it work for a week and come up with the same error. "the following printheads has a problem" the same head i just repalced

Yes, the error code indicates it is a thermistor problem and it means the problem is with the printhead of the printer, the solution for this problem is replacing the printhead, but before that, you can try to remove the printhead from the printer and then clean the contacts with a cotton swab and distilled water, after that dry them up and reseat the printhead very carefully.

You can take help from the service manual, which you can download from the link below.

http://www.americaninkjetsystems.com/epson_mimaki_roland_printer_rep/9800svc_manual.pdf

A lot of Canon printer's users come across with the error message, "U052 This type of print head is incorrect." It is a very common error on Canon printers and is fairly easy to troubleshoot.

There are two different scenarios related to U052 kind of error message.One is where the print head is not installed at all and then it is giving the 'U052 This type of print head is incorrect' error message.

And, the second scenario is where the print head is installed nut it is not functioning properly or probably not working at all. The below section will show step by step troubleshooting of both the scenarios.

U052 This type of print head is incorrect

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.

Solution 1:

• Remove and replace the cartridges.

Solution 2:

• Insert new cartridges

Solution 3:

• Reseat the print head to correct print issues or clear an error.

Solution 4:

• The print head is broken and it must be changed by a new one.

Source:
http://fix-your-printer.blogspot.com/2010/11/error-u052-on-canon-printers.html

Updating the firmware for your Lexmark Pro901 printer will help fix the problem. You will need to get rid of the error first before you can successfully update your printer. Follow the steps below:

1. Open the cover of the printer > remove the printhead. If the printhead will not go to the center, turn off the printer and pull the printhead to the center.

2. Once you have the printhead removed, close the cover of the printer and turn on the printer.

3. It will ask you to "Open Cover to Install the Printhead". Press the Home icon.

4. It should take you back to the Main menu.

5. Proceed with the firmware update, go to http://bit.ly/p905fw.

6. Once the firmware update is successful, you may reinstall the printhead. Follow the steps on the printer screen.

Source: There is a Problem with the Printhead

take it out. Shake real hard over a sink. Worked with mine after spending 30 minutes with support...

Error code 3807 means printhead problem. IF new printhead has been installed, printer needs to be replaced. Call 1.800.235.6325

Hi follow the instructions as above...
ie Remove inks and print head...

But instead...
Whilst Canon print head is out...

Use cotton wool and alcohol and clean electrical contacts on back of print head and where they make contact inside printer.

Then install print head and inks and test.

If it does not work you may need to replace print head.
Hope it helps!
Good Luck!

John
https://magicinkjetflush.com