Olivetti d-Copia 6500MF Plus Service Manual page 487

1-4-4 Image formation problems
Isolate the component an image defect has occurred from.
<A guide to isolate the component of the cause.>
Run U089 to print a test page and check whether an image defect happens.
YES: Main unit as the cause of defect
NO: Scanner as the cause of defect
Perform enlarged or reduced copying and verify if the defective images are enlarged or reduced, accordingly.
YES: Scanner as the cause of defect
1. Scanner as the cause of defect:
If the defect occurs with copying or sending, refer to P.1-4-161.
(Defects caused by a reading error that occurs at the original (glass) LED lamp to CCD (DP: CIS).)
Isolate the problem at the location that the originals are scanned.
a. Single side DP (read by Main CCD)
b. On the contact glass (read by Main CCD)
c. Back side DP (For DP mounted with CIS)
2. Main unit as the cause of defect: refer to P. 1-4-161.
(A defect of image forming occurs from the rendering process that involves charging, drum, LSU,
developer, and primary transferring.)
<Flow of image data>
Copying :
LED lump CCD
→
CIS
→
(DP: back)
Sending :
LED lump CCD
→
CIS
→
(DP: back)
Printing data from PC :
Printer
Driver → (DDR mem-
Y116520-3
ISC
→
PWB
→
DP relay
memory)
PWB
ISC
→
PWB
→
DP relay
memory)
PWB
Main PWB
→ HDD →
ory
Main
PWB
→ HDD →
(DDR
Main
PWB
→ HDD →
(DDR
Main PWB
(DDR mem- →
ory
1-4-159
Engine
LSU
PWB
→ relay
(DDR
PWB
memory)
Main
PWB
→ PC
(DDR
memory)
Engine
LSU relay
PWB →
PWB
2N8/2N7
LS
→
U
→ LSU
Service Manual