Ricoh V-C3 D081, Руководство по обслуживанию на месте

Страница: 536 / 1092

Special Procedures
Correcting the Halo Effect
Images printed with the GW controller may show a "halo" effect when printing in 2-bit mode
(1800x600dpi) and in 4-bit mode (9600x600dpi).
Problem
• This problem is most visible when text is overlaid onto halftone areas in 2-bit mode or 4-bit mode. The
greater the difference in image density between text and halftone areas, the more noticeable the halo
effect.
• This problem is also evident when the mode is changed to 2-bit mode. (The default dithering pattern
for 2-bit mode is designed to improve gradation, but this can also make the halo effect more visible.)
• This problem is a product limitation for this model, as announced in the SLG (User/Sales/Service
Remarks #12).
Solution
The following solution is only effective when using the GW controller. There are two ways to reduce the
halo effect:
1. Print out the image using 1-bit mode (600x600dpi) instead, or
2. Change the dither pattern used in 2-bit mode (1800x600dpi).
As mentioned above, the default dither pattern for 2-bit mode is provided to improve gradation.
However, there is one more dither pattern (“Low halo effect dither”) that can be selected to reduce
the halo effect.
Procedure: To Change the Dither Pattern for 2-Bit Mode
Do the following procedure manually to change the dither pattern used in 2-bit mode to “Low halo effect
dither”.
1. Confirm that the Printer/Scanner firmware is Ver1.00.1 (D3765902A) or newer.
2. Execute SP5801-008 (Memory Clear Printer Application).
When you execute this SP, the following will be reset to factory settings:
• The gamma curve adjusted at the last Printer ACC execution.
• All Group SP1000 settings in Printer SP mode, which includes SP1104 (Gamma Adjustment)
and SP1106 (Toner Limit).
3. When you see the “Completed. You have to reboot.” message, turn the machine on.
4. Open Printer SP1001-002 (Bit Switch – Bit Switch 2 Settings).
5. Touch the “6” key, and then the [#] key on the operation panel.
The LCD display will change:
6. Troubleshooting
534
6