Olivetti d-color MF651, Service Manual, Page: 945 / 1053

Field Service Ver. 2.0 Jul. 2009 22. IMAGE QUALITY PROBLEM
885
TROUBLESHOOTING
13 Image Process
Adjustment
o
Gradation
Adjust
(Service Mode)
“Conv. Value” falls within the
specified range as checked through
gradation adjust.
Dark: 0 ± 100
Highlight: 0 ± 60 YES Go to step 17.
14 Image Process
Adjustment
o
D Max Density
(Service Mode)
The problem has been eliminated
through the adjust of D Max. NO Go to next step.
15 Image Process
Adjustment
o
Stabilizer
o
Init Image
Stabilization
(Service Mode)
After the Init Image Stabiliza-
tion sequence has been completed,
run gradation adjust. NO Go to next step.
16 Printer control
board (PRCB)
PH relay board
(REYB/PH) Check the connection of connectors,
harness, and flat cables between
PRCB and REYB/PH, and correct if
necessary. NO Change printer control board.
Change PH relay board.
17 The problem has been eliminated
through the checks of steps up to 16. NO Change imaging unit.
o Change PH unit.
o Change high voltage unit/2.
Step Section Check item Result Action
Y110571-1 Service Manual