Trouble code
Description
Main
code
Sub
code
EE EL Content Auto developing tone adjustment trouble
(overtoner error)
Detail A sample data is less than 0 when auto
developing adjustment is executed.
Cause Toner density sensor defective
Charging voltage or developing voltage
improper.
Toner density improper
Developing unit defective
PCU PWB defective
Check
and
remedy
Make auto developing adjustment with
SIM25-2.
EE EU Content Auto developing adjustment trouble
(undertoner error)
Detail A sample data is less than 99 when auto
developing adjustment is executed.
Cause Toner density sensor defective
Charging voltage or developing voltage
improper
Toner density improper
Unit defective
PCU PWB defective
Check
and
remedy
Make auto developing adjustment with
SIM25-2.
U0
U9
E7
F9
82
83
84
Content U0–**: communication trouble between
MAIN and SUB (MAIN detection)
U9–**: communication trouble between
MAIN and OPE (MAIN detection)
E7–**: communication trouble between
MAIN and ICU (MAIN detection)
F9–**: communication trouble between
MAIN and PRT (MAIN detection)
Detail The slave unit does not turn On/Off the
DSR_XXX signal line as specified, when
establishing communications. (XXX is a
slave unit signal name.)
Cause Improper connection of salve unit PWB
connector
Defective harness between slave unit PWB
and Main PWB
Broken connector pin of slave unit PWB
mother board
Slave unit ROM is defective/missing/in
reverse/broken leg
Check
and
remedy
Check the connection of connector and
harness between slave unit PWB and Main
PWB.
Check slave unit PWB ROM.
Trouble code
Description
Main
code
Sub
code
U0
U9
E7
F9
85
86
8L
Content U0–**: communication trouble between
MAIN and SUB (MAIN detection)
U9–**: communication trouble between
MAIN and OPE (MAIN detection)
E7–**: communication trouble between
MAIN and ICU (MAIN detection)
F9–**: communication trouble between
MAIN and PRT (MAIN detection)
Detail Framing error/parity error occurred on the
RXD_XXX signal line. (XXX is a slave unit
signal name.)
Cause Improper connection of slave unit PWB
connector
Defective harness between slave unit PWB
and main PWB
Noise occurred on RXD_XXX signal line
Check
and
remedy
Check the connection of connector and
harness between slave unit PWB and main
PWB.
Check the copier for grounding
Check for noise around the copier.
U0
U9
E7
F9
87
88
89
8H
8C
8U
8F
Content U0–**: communication trouble between
MAIN and SUB (MAIN detection)
U9–**: communication trouble between
MAIN and OPE (MAIN detection)
E7–**: communication trouble between
MAIN and ICU (MAIN detection)
F9–**: communication trouble between
MAIN and PRT (MAIN detection)
Detail A protocol error occurred between main
and slave units
(XX-87/89 means that data from slave unit
could not be processed within specified
time)
(XX-88 means that slave unit does not
respond within specified time.)
(XX-8H means that slave unit does not
send ROM version within specified time.)
Cause Software bug
Check
and
remedy
Check reproducibility
U0
U9
E7
F9
90
91
Content U0–**: communication trouble between
MAIN and SUB (SUB detection)
U9–**: communication trouble between
MAIN and OPE (OPE detection)
E7–**: communication trouble between
MAIN and ICU (ICU detection)
F9–**: communication trouble between
MAIN and PRT (PRT detection)
Detail The main unit does not turn On/Off
DTR_XXX signal line as specified, when
establishing communication. (XXX is a
slave unit signal name.)
Cause Improper connection of slave unit PWB
connector
Defective harness between slave unit PWB
and main PWB
Broken connector pin on mother board of
slave unit PWB
Check
and
remedy
Check the connection of connector and
harness between slave unit PWB and main
PWB.
9 – 98
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