HP 750 User Manual

Page 181

Print Quality

C4705-90000

9-3

4 Cartridges

51644M Magenta Problem

51644M Magenta Cartridge: Replace the cartridges built from 12/95 through 3/96

(expiry dates from 6/97 to 9/97). These cartridges can cause banding problems

(misdirection) and color shift (greenish black).

Cartridge Troubleshooting Process

If you don't have any samples yet, reproduce the original problem with the correct

printer settings.

Perform the service test 15 Area fill PQ Plot" (details ' page 8Ć35) with the following

configuration:
PQ:

Best

Media setting: HP HighĆGloss Photo, HighĆGloss Film media or

HP Heavy coated media

You can identify the cartridges that are failing by checking the area fills. These are

the area fills that will be affected by a cartridge problem (nozzle out or misdirected):

Defective

Cartridge

Area Fills Affected

Magenta

Magenta, Red (MY), Blue (MC), Black (CMY),

Greenish Black (CMY)

Cyan

Cyan, blue (CM), green (CY), black (CMY), Reddish black (CMY)

Yellow

Yellow, red (MY), green (CY), black (CMY), Bluish black (CMY)
(Artifacts in the Yellow block are difficult to see)

To check the nozzle checkĆout and the Pen to pen alignment, perform the service test

14 Color PQ Plot" (details ' page 8Ć35) with the following configuration:
PQ:

Fast

Media setting: Opaque Bond

Replace the cartridges if a problem is detected.

Cartridge Alignment

Perform the cartridge alignment (details ' page 8Ć40) using HP Matte Film or

HighĆGloss Film. If not available, use Coated media or opaque bond if required.

If you get an Alignment Error", ensure that the carriage does not have a pen

insertion problem (refer to service note ' page 10Ć20) and replace it if necessary.