Foggy Background - Minolta Di350 Service Manual

FrameMaker Ver.5.5E(PC) Di350 TROUBLESHOOTING
98.12.09

(4) Foggy Background

Section Step
1 Is sunlight or any other extrane-
——
ous light entering the copier?
Engine 1 Is the PC Drum dirty with foreign
matter?
2 Is the PC Drum charge voltage
terminal in good condition?
3 Is the grid voltage terminal in
good condition?
4 Is the developing bias terminal in
good condition?
5 Is the Charge Neutralizing Sheet
voltage terminal in good condi-
tion?
6 Is Eraser Lamp LA1 dirty?
7 Does foggy background persist
even after the I/C has been
replaced with a new one?
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.
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.
IR 1 Are the mirrors and lens dirty?
2 Is the Exposure Lamp dirty or
deteriorated?
3 Do the connections between the
Exposure Lamp and INV remain
intact?
4 Do the connections from INV to
BCR remain intact?
5 Do the connections from BCR to
HGB remain intact?
6 Do the connections from HGB to
UN2 remain intact?
Check Item
T-48
Result
YES Protect the copier from extrane-
ous light.
YES Clean the PC Drum.
NO Check and change as neces-
sary.
NO Check and change as neces-
sary.
NO Check and change as neces-
sary.
NO Check and change as neces-
sary.
YES Clean.
NO This completes the procedure.
NO This completes the procedure.
YES Change HV1, PH Unit, or PWB-
A, in that order.
NO This completes the procedure.
YES Clean or change.
YES Clean or change.
NO Reconnect.
NO Reconnect.
NO Reconnect.
YES Change INV, BCR, HGB, or
UN2, in that order.
NO Reconnect.
Action