Service manual

FrameMaker Ver.5.5E(PC) Di350 TROUBLESHOOTING
98.12.09
T- 4 8
(4) Foggy Background
Section Step Check Item Result Action
——
1 Is sunlight or any other extrane-
ous light entering the copier?
YES Protect the copier from extrane-
ous light.
Engine 1 Is the PC Drum dirty with foreign
matter?
YES Clean the PC Drum.
2 Is the PC Drum charge voltage
terminal in good condition?
NO Check and change as neces-
sary.
3 Is the grid voltage terminal in
good condition?
NO Check and change as neces-
sary.
4 Is the developing bias terminal in
good condition?
NO Check and change as neces-
sary.
5 Is the Charge Neutralizing Sheet
voltage terminal in good condi-
tion?
NO Check and change as neces-
sary.
6 Is Eraser Lamp LA1 dirty? YES Clean.
7 Does foggy background persist
even after the I/C has been
replaced with a new one?
NO This completes the procedure.
8 Does foggy background persist
when the “Image Density” value
is changed toward the minus
side? “Image Density” can be
selected as follows: Tech. Rep.
Mode
→
Tech. Rep. Choice
→
Printer.
NO This completes the procedure.
9 Does foggy background persist
when the “VG Adjust” value is
changed toward the minus side?
“VG Adjust” can be selected as
follows: Tech. Rep. Mode
→
Tech. Rep. Choice
→
Printer.
YES Change HV1, PH Unit, or PWB-
A, in that order.
NO This completes the procedure.
IR 1 Are the mirrors and lens dirty? YES Clean or change.
2 Is the Exposure Lamp dirty or
deteriorated?
YES Clean or change.
3 Do the connections between the
Exposure Lamp and INV remain
intact?
NO Reconnect.
4 Do the connections from INV to
BCR remain intact?
NO Reconnect.
5 Do the connections from BCR to
HGB remain intact?
NO Reconnect.
6 Do the connections from HGB to
UN2 remain intact?
YES Change INV, BCR, HGB, or
UN2, in that order.
NO Reconnect.