MX3500N SELF DIAG AND TROUBLE CODE 8 – 5
E7 20 LSU BD detection trouble PCU
21 LSU LD deterioration trouble PCU
28 LSU control ASIC connection abnormality PCU
29 LSU-ASIC frequency abnormality PCU
50 Engine connection trouble PCU
55 PWB information sum error (Engine detection) PCU
60 Controller connection trouble (Engine detection) MFP
61 Controller connection trouble (Engine) MFP
62 Controller connection trouble (Scanner) MFP
65 PWB information sum error (Controller detection) MFP
70 Scanner connection trouble SCU
75 PWB information sum error (Scanner detection) SCU
80 Communication trouble between the controller and the
scanner
MFP
90 Communication trouble between the controller and the
engine
MFP
EE EC Auto developer adjustment trouble (The sample level
for every rotation is other than 128 ± 10.)
PCU
EL Auto developer adjustment trouble (overtoner error) PCU
EU Auto development adjustment trouble (Under-toner
abnormality)
PCU
F1 00 Finisher communication trouble (Machine side
detection)
PCU
02 Saddle finisher transport motor trouble PCU
03 Finisher paddle motor trouble (MX-FNX2), finisher
swing motor trouble (MX-FNX1)
PCU
08 Finisher stapler shift motor trouble PCU
10 Finisher staple motor abnormality PCU
11 Finisher bundle process motor abnormality PCU
15 Finisher tray lift motor abnormality PCU
19 Finisher pre-alignment motor abnormality PCU
20 Finisher after-alignment motor abnormality PCU
21 Finisher fan motor abnormality (MX-FNX1), Finisher
interface fan motor abnormality (MX-FNX2)
PCU
31 Finisher folding sensor trouble (MX-FNX2) PCU
32 Communication trouble between the finisher and the
punch unit (MX-FN2)
PCU
33 Finisher punch shift motor trouble PCU
34 Finisher punch motor trouble PCU
35 Finisher punch side registration sensor trouble (MX-
FNX2)
PCU
36 Finisher punch registration sensor trouble (MX-FNX2) PCU
37 Finisher backup RAM trouble PCU
38 Finisher punch backup RAM trouble (MX-FNX2) PCU
39 Finisher punch dust sensor trouble (MX-FNX2) PCU
40 Saddle finisher punch power interruption trouble (MX-
FNX2)
PCU
50 Finisher incompatibility trouble PCU
F2 39 Process thermistor trouble PCU
40 Toner empty sensor abnormality (BLACK) PCU
41 Toner empty sensor abnormality (CYAN) PCU
42 Toner empty sensor abnormality (MAGENTA) PCU
43 Toner empty sensor abnormality (YELLOW) PCU
44 Black exclusive image density sensor trouble (Transfer
belt surface reflection ratio abnormality)
PCU
45 Color exclusive image density sensor trouble
(Calibration plate surface reflection ratio abnormality)
PCU
49 LSU thermistor trouble PCU
50 K phase sensor sensing trouble PCU
51 CL phase sensor sensing trouble PCU
58 Process humidity sensor trouble PCU
64 Toner supply abnormality error (BLACK) PCU
65 Toner supply abnormality error (CYAN) PCU
66 Toner supply abnormality error (MAGENTA) PCU
67 Toner supply abnormality error (YELLOW) PCU
70 Toner cartridge improper cartridge detection (BLACK) PCU
71 Toner cartridge improper cartridge detection (CYAN) PCU
72 Toner cartridge improper cartridge detection
(MAGENTA)
PCU
Trouble code
Trouble code content Remarks
Trouble
detection
Mechanism Option Electricity FAX Supply
Main
code
Sub
code
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