HP 750 - Manual (Page 181)

Print Quality C4705-90000 9-3
4 Cartridges
51644M Magenta Problem
D 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
D If you don't have any samples yet, reproduce the original problem with the correct
printer settings.
D 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)
D 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
D Replace the cartridges if a problem is detected.
Cartridge Alignment
D 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.
D 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.