Konica Minolta bizhub PRO 1050 Service Manual page 456

10. SERVICE MODE
No.1 Overall halftone (8-bit output)
(created by random dot pattern)
[Check item]
• When density is set to 70 (halftone)
If there are white stripes, black stripes, determine whether the fault is with the scanner system or the proc-
ess system.
[Recommended checkpoints]: Developing unit, cleaning unit, charger unit, transfer/separation charger
unit, scanner mirrors, slit glass, original glass
• When density is set to 0 (white)
If the test pattern is gray background image, determine whether the fault is with the process.
[Recommended checkpoints]: Charger, high voltage contact
• When density is set to 255 (black)
If the density is light, determine whether the fault is with the process.
[Recommended checkpoints]: Write unit
* For information about setting the density, see
Note
• All print outputs in the user mode are outputted with 1-bit or 2-bit error diffusion. However, since
this pattern is output in 8-bit, an uneven density is apt to conspicuous. Therefore, when check-
ing an uneven density in halftones (other than 0 and 255 in the density setting), be sure to use
the test pattern No. 9.
Test patterns
When the density is set to 70
422
"10.8.2 Test pattern
When the density is set to 0
Field Service Ver3.0 Nov.2006
density".
When the density is set to 255
1050fs3011c