Problems with printing blues and green - HP 6978

[Dr_Nano]

I'm having a problem with the 6978 printing blues and greens as shown below.  The color just seems to drop out on some lines.  I suspect it's with the cyan cartridge.  It started when the ink was low but not tapped out.  I replaced all cartridges and the problem remains.  I've done all cleaning procedures and the usual diagnostics.

BTW, the yellow is perfectly OK.  That's in the graphic.

Thanks!

[Echo_Lake]

@Dr_Nano

Thank you for posting on HP Support Community.

Don't worry as I'll be glad to help, I have a few troubleshooting steps we could try to fix the issue:  

Print a Print Quality Diagnostic Page, and then evaluate the results.

1. Load plain white paper in the input tray.

2. From the printer control panel, open the Setup menu.

3. Open the Reports or Tools menu.

4. Touch Print Quality Report.

   A Print Quality Diagnostic Page prints.

   

Evaluate Test Pattern 1 on the Print Quality Diagnostic Page to make sure the lines are straight and connected.

• If the lines in Test Pattern 1 are straight and connected, skip to the step to examine Test Pattern 2.

• If the lines in Test Pattern 1 are not straight and connected, continue to the next step to align the printhead.

Hope this helps! Keep me posted for further assistance.
Please click “Accept as Solution” if you feel my post solved your issue, it will help others find the solution.

[Dr_Nano]

Thanks very much!  Here's the scan you requested.

[Dr_Nano]

I don't know why, but the graphic is showing up when I write the reply but not when I post it.

[Dr_Nano]

[Dr_Nano]

[Dr_Nano]

I am sorry but your website does not allow me to post this.  The images are constantly rejected.

[Betty0610]

Do you have another cyan cartridge to try with?

[ROBERTSALERNO]

FACENDO L'ALLINIAMENTO DELLA TESTINA E PULENDO LE TESTINE , NELLA STAMPA DEI COLORI NON COMPARE IL BLU ED IL MAGENTA. LE CARTUCCE SONO NUOVE APPENA COMPRATE. SI PUò FARE UN RESET DI FABBRICA?

aLTRIMENTI UN CENTRO ASSISTENZA HP PIù VICINO A sALERNO DOVE STA?

SALUTI

[Betty0610]

@ROBERTSALERNO

Welcome to the HP Support Community.

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