HP 750 User Manual

Page 204

10-6

C4705-90000

Product History and Service Notes

Firmware A.02.09

D The print modes with Glossy media and Print Quality Best are printed in 6 passes.
D Provides a significant improvement in paper advance error compensation, which is

optimized when we add a line on the mark encoder (Refer to Service Note ' page 10Ć18).

D Possible media jam when powering on the unit (3% or less). This problem is only present

in firmware revision A.02.08.

D Corner case when it does not find mark encoder, it ejects media continuously. This

problem is only present in firmware revision A.02.08.

D The I/O timeĆout was applied when sending PostScript jobs to the MIO port using all

protocols but EtherTalk (so, TCP/IP, Novell and DLC/LLC) in previous versions. Since

the front panel I/O timeĆout was 30 minutes by default, the symptom was having blocked

the I/O during this amount of time. The workaround was to manually set the frontĆpanel

timeĆout to 30 seconds.

D When printing through a Centronics (not BiĆtronics) port the plotter hangs after printing

around 30 PostScript plots. The problem can also occur with HPĆGL2 files but with less

severity. This problem only occurs in firmware revision A.02.08.

D Plotter hangs after sending several files with small margins. This bug is present in

firmware revision A.02.08.

Firmware A.02.08

D Banding Reference Localization of the mark encoder during the initialization: Firmware

revisions A.02.03 and A.02.04 have a certain variability detecting the reference of the paper

advance correction (mark encoder) during the initialization at the power up. If the error is

too high, the paper advance correction will not be efficient. This problem affects only the

units that require the paper advance correction (approximately about 30% of our units).

D The accuracy calibration changed to improve the performance of the calibration.
D Banding and pattern when printing with the following configuration:

Monochrome.

Coated, Heavyweight and Bond.

Best and Normal.

D When the plotter is set to SMALL MARGINS, the black pen is not serviced after cutting

the print. As a result, the black pen dries and may have startĆup problems. The new code

applies servicing to this pen after cutting.

D Japanese/Portuguese/Spanish/German localizations corrected.
D Service Configuration plot improvements :

Mono not grayscaling colors.

Showing all K pen drop detect infos.

D Plotter hangs after 20 plots when Maintenance Advised" message shows up on the front

panel display.

D MIO & JETADMIN: Out of memory" when receiving PML requests. JetAdmin polls the

printer every 2 seconds, and the PML requests sent to it remain in its memory. That

means that the memory is filled with PML packets. This fact can fill the memory

(DesignJet 750C with no extra memory: only 4 MB) after 55 minutes if only one device

has JetAdmin opened during all that time. If there are two, the time to obtain an Out of

memory" message is reduced to a half, and so on.