Timbergetter

asked Jul 8, 2015 at 6:32pm
Brother Brother MFC 6490CW

Brother Ink Jet - Print Qual Check Interpret

The Print Quality Check report from my MFC-6490CW ink jet printer presents the following results:

Black--------Yellow--------Cyan--------Magenta
xxxxxxxxxxxx x_x_x_x_x_x_ xxxxxxxxxxxx xxxxxxxxxxxx
xxxxxxxxxxxx
xxxxxxxxxxxx x_x_x_x_x_x_ xxxxxxxxxxxx xxxxxxxxxxxx
xxxxxxxxxxxx
xxxxxxxxxxxx x_x_x_x_x_x_ xxxxxxxxxxxx xxxxxxxxxxxx
xxxxxxxxxxxx
xxxxxxxxxxxx x_x_x_x_x_x_ xxxxxxxxxxxx xxxxxxxxxxxx
xxxxxxxxxxxx
xxxxxxxxxxxx x_x_x_x_x_x_ xxxxxxxxxxxx xxxxxxxxxxxx
xxxxxxxxxxxx
xxxxxxxxxxxx x_x_x_x_x_x_ xxxxxxxxxxxx xxxxxxxxxxxx
xxxxxxxxxxxx

Black, Cyan and Magenta are perfect. Yellow is missing every alternate bar. Cleaning does not improve this effect. With service manual in hand I did a teardown to see if I could get to Print Head without a problem. I reassembled printer and the exact same problem persists.

This does not seem to be the normal blocked nozzle problem because of the regular pattern of missing bars. I am tempted to lash out and get a new print head, thinking that it might be a signaling issue around the piezos within the head assembly.

What I would really like to do first would be to somehow interchange the data lines for yellow and say cyan between the main board and the head to see whether the problem migrated to the other colour. In that way I could be pretty sure that the head was, or was not, the fault.

Has anyone come across the pattern I’m getting and how would you interpret the alternating pattern?
I have now got a new print-head for my MFC-6490CW printer. Unfortunately it arrived without any Print Head Property Code. This code used to be prepared on the production line for each head and records the variability inherent in the manufacturing process of the piezos. This unique code would then be entered into the printer’s EEPROM to effectively iron out the variability. I wonder if Brother’s manufacturing process has improved to the point where consistent head performance has been achieved resulting in there being no need to calibrate them. If that is the case then what code needs to be present in EEPROM to support a new head? Has anyone had any recent experience with installing a new head in a Brother inkjet printer and be able to shed light on what is current practice with regards to the Print Head Property Code?
by Timbergetter on Aug 3, 2015 at 4:47pm Add comment
I have now got a new print-head for my MFC-6490CW printer. Unfortunately it arrived without any Print Head Property Code. This code used to be prepared on the production line for each head and records the variability inherent in the manufacturing process of the piezos. This unique code would then be entered into the printer’s EEPROM to effectively iron out the variability. I wonder if Brother’s manufacturing process has improved to the point where consistent head performance has been achieved resulting in there being no need to calibrate them. If that is the case then what code needs to be present in EEPROM to support a new head? Has anyone had any recent experience with installing a new head in a Brother inkjet printer and be able to shed light on what is current practice with regards to the Print Head Property Code?
by Timbergetter on Aug 3, 2015 at 4:47pm Add comment