Mita-Kyocera FS175375 T R O U B L E S H O O T I N G
Troubleshooting
Board layouts
Chapter Six
TROUBLESHOOTING
6-1
FS-1750/FS-3750 Series
Troubleshooting
Board layouts
Chapter Six
Board layouts 6-4
Liaison board/KP-504 6-4
Scanner interface board/KP-488 6-5
Engine board connectors/KP-535 6-5
Fuser board/KP-499 6-6
Drum connector/YC-741 (KP-500 board) 6-6
General wiring diagram ➊ 6-76-6
General wiring diagram ➋ 6-8
Diagnostic 6-9
Engine diagnostics flow 6-10
Logic controller diagnostics flow 6-11
General error handling 6-12
Priority 6-12
User-recoverable errors 6-14
Memory card errors 6-17
Service errors 6-19
E0 - Communication error 6-19
E1 - Main motor error 6-19
E2 - Laser scanner motor error 6-21
E3 - Laser beam detection error 6-23
E4 - Fuser heater error 6-25
E5 - Eraser error 6-27
E6 - Flash ROM error 6-29
E9 - Toner motor error 6-29
F0 - Front control panel error 6-31
F1 - System ROM error 6-31
F2 - Main memory error 6-31
F3 - General failure 6-31
False errors - “Paper Feed Unit Open” 6-32
False errors - “Top Cover Open” 6-33
False errors - “Side cover Open” 6-34
False errors - “Missing Waste-toner bottle” 6-35
TROUBLESHOOTING6-1
Print quality problems 6-36
Completely blank printout 6-36
All-black printout 6-36
Dropouts 6-37
Black dots 6-38
Horizontal streaks 6-38
Black vertical streaks 6-39
Unsharp printing 6-39
Grey background 6-40
Dirt on the top edge or back of the paper 6-41
REPETITIVE DEFECTS GAUGE 6-43
6-2
FS-1750/FS-3750 Series
CHECKING CASSETTE SIZE SENSORS 6-44
Drum cleaning 6-45
Troubleshooting
Board layouts
6-3
FS-1750/FS-3750 Series
Board layouts
Relay board/KP-504
Troubleshooting
Board layouts
Symbol
(above)
➊
➋
➌
➍
➎
➏
➐
➑
Connector Connected to: Check point
YC806 Fan (large)
YC802 Main motor E1, Pin 3 (MOTOR*)/Pin 1 (+24V)
YC808 Fan (small)
YC803 Registration clutch
YC804 Paper feed clutch
YC801 Engine board E1, Pin 12 (MOTOR*)
YC805 Manual feed clutch
YC807 Front operator panel
6-4
FS-1750/FS-3750 Series
Scanner interface board/KP-488
Troubleshooting
Board layouts
YC675
4 - SCANR*
Engine board connectors/KP-669
+24V - 13
10 - PD*
13 - LASR*
7 - DSCLK
1 - +24V
YC203 (To
scanner
unit)/See
LASR* - 1
PD* - 6
SCNCLK - 8
12 - SCANR*
6-5
FS-1750/FS-3750 Series
Fuser board/KP-499
Troubleshooting
Board layouts
Drum connector/YC-741 (KP-500 board)
Pin 13
Pin 1
YC721 (➲KP-492)
5 - THERM* 8 - +5V
KP-500 board
6-6
FS-1750/FS-3750 Series
General wiring diagram(FS-1750)
AC IN
S02013
1
2
(CN1)
SWITCH
1
2
(CN2)
S02039 : E
S02012 : U
THERMO CUT OUT
HEATER
SENSOR
FULL
SOLENOID
UP/DOWN
S02021
SENSOR
C
1
E
2
2
ZENER PWB
(KP-501)
TRANSFER ROLLER
MAG ROLLER
TONER
SENSOR
TNEND*
2
2
GND
1
1
TDRV
2
2
+24V
1
1
S02029
S02023
TONER
MOTOR
S02036
POWER
THERMISTER
THERM*
S02019
PAPAER
+5V
1
1
PAPFL*
2
2
GND
3
3
FCUP*
FACE
1
1
+24V
2
2
FDOWN*
3
3
TNFULL PWB
(KP-506)
(YC841)
(YC842)
121
ERASER
TNEND*
1
1
GND
2
2
TDRV
3
3
+24V
4
4
S02022
FEED ROLLER
+5V
1
1
2
2
1
1
2
2
3
3
1
1
2
2
3
3
S02018
+5V
1
1
TNFULL*
2
2
TSEN*
3
3
S02043
ERASER
GND
1
2
HIGH VOLTAGE UNIT
3
4
5
6
7
8
1
1
9
2
2
10
11
12
(CN1)
(CN2)
5
5
13
6
6
14
MANUAL PAPER
POWER SUPPLY UNIT
(CN4)
1
1
6
+24V
(YC702)
+24VCOM
+24VCOM
+24VCOM
SENSOR PWB
(KP-498)
(YC723) (YC724) (YC722)
FUSER PWB
(KP-499)
(YC743)
(YC741)
1
1
2
2
DRUM PWB
3
3
(KP-500)
(YC742)
121
121
2
2
S02381
(旧S02008)
+24V
1
MHVDR*
2
THVDR*
3
HVMON*
4
HVISEL
5
HVCK
6
PSEL*
7
TEND
8
+5V
9
GND
10
MICR
11
GND
12
SCAN
13
MDRV
14
PAPER SENSOR
MANUAL FEED
3
3
2
2
1
1
GND
PD*
+5V
65432
65432
+5V
12345
1
2
3
4
5
6
7
8
9
10
11
12
13
14
1
2
3
4
(CN3)
5
6
7
8
9
10
(旧 S02011)
S02385
1
2
3
4
5
6
(YC701)
7
8
9
10
11
12
13
14
15
1
2
(YC721)
3
4
5
6
7
8
(YC821)
(YC822)
1
1
2
2
3
DRUM RELAY
PWB
3
4
4
5
5
(KP-505)
6
6
7
7
8
8
(YC355)
10
8
9
10
8
9
HANDS*
+5V
GND
S02382
GND
1
GND
GND
+5V
+5V
+5V
ZCROSS
HEAT*
PSAVE
+24V
(旧S02010)
SCOVER*
PAPER*
FEEDS*
TNCON*
+24V
+24V
+24V
+24V
FCOVER*
TCOVER
CAST2
CAST1
CAST0
GND
1
2
3
4
5
6
7
8
(旧S02007)
TSEN*
TNFULL*
ERASER
EECSEL
EEDAT
EESCK
GND
+5V
(YC381)
(YC382)
1
2
2
3
3
(YC352)
4
4
5
5
6
6
7
7
8
8
9
9
10
10
S02384
1
1
2
2
3
3
4
4
5
5
6
6
7
(YC358)
7
8
8
9
9
10
10
11
11
12
12
13
13
14
14
15
16
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
10
EPAP*
1
2
3
4
5
6
7
8
9
(YC353)
(YC356)
EMOT*
EUNIT*
(KP-502)
(KP-701)
1234567
1234567
+24V
1234567
1234567
CONNECT PWB
(YC351)
10
10
S02386(旧 S02016)
GND
10
S02036
15
16
S02009
FCUP*
+24V
FDOWN*
PAPFL*
THERM*
EXITJ*
GND
+5V
S02380
1
2
3
4
5
6
7
8
9
10
(YC357) (YC354)
GND
HANDS*
PUNIT*
ENVEROP
FEEDER
PWB
To PF-7E
Engine Controller
(KP-699)
(YC202)
SEL10
SEL11
SEL12
SDATI
SDATO
To OPTION UNIT
(YC201)
(YC204)
10
11
12
(YC203)
10
11
12
13
14
REDY
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
+5V
1
2
3
4
5
6
7
8
9
10
11
12
1
2
3
4
5
6
7
8
9
10
11
12
13
14
SCLK*
(YS1)
(YS2)
(YC1)
(YS3)
S02020
GND
FPCLK
FPDIR
FPDATA
+5V
FAN*
FEDDR*
MFDDR*
MTRCLK
REGDR*
MOTOR
+24V
S02046
LASER*
LONB*
VDO+
+5V
VDOPD*
LSGND
SCNCLK
LSGND
SCRDY*
GND
SCANR*
+24V
GNDP
123456789
123456789
+24V
123456789
(YC4)
S02038
10
12
11
13
14
11
12
10
S02383(旧 S02015)
PC-Card
PC-SIMM
PC-SIMM
PowerPC603e
-100MHz
XLI
ROM (DIMM)
(KP-710)
RELAY PWB
(KP-504)
2
2
1
1
4
4
3
3
6
6
5
5
8
8
7
7
10
9
9
12
11
(YC801)
13
14
APC RELAY PWB
11
12
9
9
10
7
7
8
8
(KP-488)
5
5
6
6
3
3
4
4
1
1
2
2
(YC675)
10
10
+24V
GND
10
(YC354)
(YC371)
Troubleshooting
Board layouts
Centronics
(YC2)
(KP-725)
(YC3)
FUP*
S02044
1
2
3
4
5
6
7
1
2
3
1
2
3
4
5
6
7
8
1
2
3
4
5
FOP*
(YC5)
1
1
1
2
2
2
3
3
3
4
4
4
Regist
Clutch
Feed
Clutch
M.Feed
Clutch
Motor
Box Fan
Motor
1
2
3
1
2
3
4
5
6
7
8
1
2
3
4
5
123456789
123456789
MON*
123456789
RS-232C
OPTION I/F
Main Motor
Fan
Front Panel
(KP-503)
S02037
PD PWB
(KP-483)
APC PWB
(KP-705)
Polygon Motor
VLOW*
S02014
Main Controller
(KP-724)
+24V
(YC802)
1
1
GND
2
2
MOTOR*
3
3
MTRCLK
4
4
S02047
(YC803) (YC804) (YC805) (YC806)
+24V
1
1
REGDR*
2
2
+24V
1
1
FEDDR*
2
2
+24V
1
1
MFDDR*
2
2
FANCOM
1
1
FANDR*
2
2
(YC808)
BFANCOM
1
1
BFANDR*
2
2
S02001
+5V
1
1
FPDAT
2
2
+5V
(YC807)
3
3
FPDIR
4
4
GND
5
5
FPCLK
6
6
GND
7
7
S02025
(YC674)
+5V
1
PD*
2
GND
3
+5V
1
LONB*
2
LASR*
3
(YC673)
VDO+
4
VDO-
5
LSGND
6
LSGND
7
GND
8
+24V
1
1
GND
(YC671)
2
2
SCANR*
3
3
SCRDY*
4
4
SCNCLK
5
5
(YC359)
HSCOPN
HSPAP*
UNIT*
FUX PWB
(KP-493)
To HS-20
S02006
S02004
S02005
(GND)
6-7
FS-1750/FS-3750 Series
General wiring diagram(FS-3750)
Troubleshooting
Board layouts
TDK HF70T18*6*10
1
2
1
2
THERMO CUT OUT
HEATER
S02021
SENSOR
C
1
E
2
ZENER PWB
(KP-501)
TRANSFER ROLLER
TONER
SENSOR
TNEND*
2
2
GND
1
1
2
2
1
1
S02029
TONER
MOTOR
AC IN
S02013
(CN1)
POWER
SWITCH
(CN2)
S02039 : E
S02012 : U
THERMISTER
SENSOR
PAPAER
FULL
SOLENOID
UP/DOWN
FACE
(YC842)
121
2
MAG ROLLER
1
2
TDRV
3
+24V
4
S02023
S02036
+5V
1
1
PAPFL*
2
2
GND
3
3
FCUP*
1
1
+24V
2
2
FDOWN*
3
3
TNFULL PWB
(KP-506)
ERASER
TNEND*
1
GND
2
TDRV
3
+24V
4
S02022
FEED ROLLER
1
1
6
+5V
(YC723) (YC724) (YC722)
1
1
THERM*
2
2
S02019
1
1
2
2
3
3
1
1
2
2
3
3
S02018
(YC841)
+5V
1
1
TNFULL*
2
2
TSEN*
3
3
S02043
ERASER
GND
1
2
HIGH VOLTAGE UNIT
3
4
5
6
7
8
1
1
9
2
2
10
11
12
(CN1)
(CN2)
5
5
13
6
6
14
MANUAL PAPER
POWER SUPPLY UNIT
(CN4)
+24VCOM
+24VCOM
+24VCOM
+24V
(YC702)
SENSOR PWB
(KP-498)
FUSER PWB
(KP-499)
(YC743)
(YC741)
1
1
2
2
DRUM PWB
3
3
(KP-500)
(YC742)
121
121
2
2
S02381
+24V
1
MHVDR*
2
THVDR*
3
HVMON*
4
HVISEL
5
HVCK
6
PSEL*
7
TEND
8
+5V
9
GND
10
MICR
11
GND
12
SCAN
13
MDRV
14
PAPER SENSOR
MANUAL FEED
GND
3
3
PD*
2
2
+5V
1
1
65432
65432
12345
10
11
12
13
14
+5V
1
2
3
4
5
6
7
8
9
(旧 S02011)
(YC821)
PWB
(KP-505)
(YC355)
10
10
GND
1
GND
2
GND
3
+5V
4
(CN3)
+5V
5
+5V
6
ZCROSS
7
HEAT*
8
PSAVE
9
+24V
10
S02385
SCOVER*
1
PAPER*
2
FEEDS*
3
TNCON*
4
+24V
5
+24V
6
(YC701)
+24V
7
+24V
8
FCOVER*
9
10
TCOVER
11
CAST2
12
CAST1
13
CAST0
14
GND
15
FCUP*
1
1
+24V
2
2
FDOWN*
(YC721)
3
3
PAPFL*
4
4
THERM*
5
5
EXITJ*
6
6
GND
7
7
+5V
8
8
S02380
(YC822)
TSEN*
1
1
TNFULL*
2
2
ERASER
3
DRUM RELAY
3
EECSEL
4
4
EEDAT
5
5
EESCK
6
6
GND
7
7
+5V
8
8
8
9
8
9
HANDS*
+5V
GND
(YC381)
(YC382)
S02382
1
1
2
2
3
3
(YC352)
4
4
5
5
6
6
7
7
8
8
9
9
10
10
S02384
1
1
2
2
3
3
4
4
5
5
6
6
7
(YC358)
7
8
8
9
9
10
10
11
11
12
12
13
13
14
14
15
16
1
2
3
4
5
6
7
8
10
EPAP*
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
9
EUNIT*
(KP-502)
CONNECT PWB
(KP-701)
(YC353)
(YC356)
1234567
1234567
+24V
EMOT*
1234567
1234567
S02386(旧 S02016)
S02036
(YC351)
10
10
GND
10
(YC202)
SDATI
SDATO
To OPTION UNIT
15
16
S02009
1
2
3
4
5
6
7
8
9
10
(YC357) (YC354)
GND
HANDS*
PUNIT*
ENVEROP
FEEDER
PWB
To PF-7E
(YC201)
Engine Controller
1
1
2
SEL11
(YC203)
SEL10
(YC204)
10
11
12
10
11
12
13
14
REDY
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
10
11
12
TDK HF70T25*13*15
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
10
11
12
13
14
SCLK*
+5V
(KP-699)
SEL12
(YS1)
(YS2)
(YC1)
(YS3)
S02020
GND
FPCLK
FPDIR
FPDATA
+5V
FAN*
FEDDR*
MFDDR*
MTRCLK
REGDR*
MOTOR
+24V
S02046
LASER*
LONB*
VDO+
+5V
VDOPD*
LSGND
SCNCLK
LSGND
SCRDY*
GND
SCANR*
+24V
GNDP
123456789
123456789
+24V
123456789
(YC4)
XLI
ROM (DIMM)
(KP-710)
S02038
(KP-504)
2
2
1
1
4
4
3
3
6
6
5
5
8
8
7
7
10
10
9
9
12
12
11
11
(YC801)
TDK HF70T18*6*10
13
13
14
14
11
11
12
12
9
9
10
10
7
7
8
8
5
5
6
6
3
3
4
4
1
1
2
2
(YC675)
10
10
S02383(旧 S02015)
10
(YC354)
(YC371)
PC-Card
PC-SIMM
PC-SIMM
PowerPC603e
Main Controller
-166MHz
(KP-707)
+24V
(YC802)
1
1
GND
2
2
MOTOR*
3
3
RELAY PWB
MTRCLK
4
4
S02002
(YC803) (YC804) (YC805) (YC806)
+24V
1
1
REGDR*
2
2
+24V
1
1
FEDDR*
2
2
+24V
1
1
MFDDR*
2
2
FANCOM
1
1
FANDR*
2
2
(YC808)
BFANCOM
1
1
BFANDR*
2
2
S02001
+5V
1
1
FPDAT
2
2
+5V
(YC807)
3
3
FPDIR
4
4
GND
5
5
FPCLK
6
6
GND
7
7
S02025
(YC674)
+5V
1
PD*
2
GND
3
APC RELAY PWB
+5V
1
LONB*
2
LASR*
3
(YC673)
VDO+
4
VDO-
5
LSGND
6
LSGND
(KP-488)
7
GND
8
+24V
5
5
GND
(YC671)
4
4
SCANR*
3
3
SCRDY*
2
2
SCNCLK
1
1
(YC359)
HSCOPN
HSPAP*
UNIT*
+24V
GND
(KP-493)
To HS-20
(YC3)
S02006
S02044
S02005
FUP*
(GND)
S02044
1
2
3
4
5
6
7
1
2
3
1
2
3
4
5
6
7
8
5
4
3
2
1
FOP*
(YC2)
(YC5)
1
1
1
2
2
2
3
3
3
4
4
4
Regist
Clutch
Feed
Clutch
M.Feed
Clutch
Motor
Box Fan
Motor
1
2
3
1
2
3
4
5
6
7
8
5
4
3
2
1
123456789
123456789
MON*
123456789
Centronics
(KP-708)
RS-232C
OPTION I/F
TDK HF70T18*6*10
Main Motor
Fan
Front Panel
(KP-503)
S02037
PD PWB
(KP-483)
APC PWB
(KP-482)
Polygon Motor
VLOW*
S02014
6-8
FS-1750/FS-3750 Series
Diagnostic
Troubleshooting
User-recoverable errors
The printer automatically executes its self-diagnostic test when it is powered up (displaying Selftest). The sequence and the items to be diagnosed are explained below.
When the printer locates the error with a specific item, it calls for o perator’s attention by showing
the appropriate message on the operator panel display.
The diagnostic test is done on the following systems simultaneously:
• Engine system (
• Controller system (
Flowcharts on the following pages show the order and the items diagnosed in each system.
Note. Diagnostic test is cancelled if one of the user-accessible covers is opened
during the test.
errors)
E
errors)
F
6-9
FS-1750/FS-3750 Series
Engine diagnostics flow
Power on
Troubleshooting
User-recoverable errors
1
2
Engine ROM cheksum
OK?
Yes
3
Fuser thermistor OK?
The heater lamp is turned on.
Yes
The scanner polygon motor revolves.
4
Polygon motor OK?
The polygon motor stops revolving.
Yes
The main motor revolves.
The eraser array turns on.
5
Eraser array OK?
No
No
E6 - Engine ROM error
No
No
9
10
E4 - Fuser error
11
E2 - Polygon motor
error
12
E5 - Eraser error
Yes
The eraser array turns off.
6
Main motor OK?
Yes
7
Heater temperature
OK?
The main motor turns off.
Yes
8
Engine is ready.
No
No
13
E1 - Main motor error
14
E4 - Heater error
6-10
FS-1750/FS-3750 Series
Logic controller diagnostics flow
1
Power on
Troubleshooting
User-recoverable errors
2
System ROM cheksum
OK?
Yes
3
Communication
established between
engine and main
CPUs?
Yes
4
System memory OK?
Yes
5
Controller is ready.
No
No
No
6
F1 - System ROM error
7
E0 - Communication
error
8
F2 - System memory
error
For details on how to react to the results of diagnostics, refer to section
Service errors
on page 6-19.
6-11
FS-1750/FS-3750 Series
General error handling
Priority
Each error message has a priority over the others. Thus, if two or more error messages are given
simultaneously, the error message having the highest priority is shown. The priority is as follows
(from the highest to the lowest):
Troubleshooting
General error handling
❂
=Short audio alarm/✺=Long audio alarm
Error message Category Remarks
Call service person …
Call service person F0
I/F occupied
Top cover open
Paper feed unit open
Side cover open
Paper handler cover open
Option stacker cover open
Opt. Feeder 1 (2) rear cover
open
Opt. Stacker unit rear cover
open
Duplex unit rear cover open
Replace Toner/Clean printer❂
Missing Waste-toner bottle
Replace Waste-toner bottle❂
Service error See
Service error See
User-recoverable error If not user-recoverable, see
User-recoverable error If not user-recoverable, see
User-recoverable error If not user-recoverable, see
User-recoverable error When a HS-20/HS-21 is installed.
User-recoverable error When a HS-3E is installed.
User-recoverable error When a PF-20/PF-21 is installed.
User-recoverable error When a SO-6/ST-20 is installed.
User-recoverable error When a DU-20/DU-21 is installed.
User-recoverable error
User-recoverable error If not user-recoverable, see
User-recoverable error
Diagnostics
Diagnostics
“Top Cover Open”
“Paper Feed Unit Open”
“Side cover Open”
“Missing Waste-toner bottle”
section.
section.
, page 6-33.
, page 6-32.
, page 6-34.
False errors -
False errors -
False errors -
False errors -
, page 6-35.
Clean printer … Press CONTINUE❂
Paper jam❂
Remove Opt. Stacker paper❂
Option Stacker paper full❂
Face-down tray paper fill❂
Paper path error❂
User-recoverable error
User-recoverable error
User-recoverable error
User-recoverable error HS-3E
User-recoverable error FS-3750 only
User-recoverable error
6-12
FS-1750/FS-3750 Series
Error message Category Remarks
MEMORY CARD err Insert again
Insert the same MEMORY CARD
Print Cancel?
Memory overflow … Press
CONTINUE❂
Print overrun … Press CONTINUE❂
KPDL error … Press CONTINUE❂
MEMORYCARD err … Press
CONTINUE❂
Opt. ROM error … Press
CONTINUE❂
Troubleshooting
General error handling
User-recoverable error
User-recoverable error
User-recoverable error
User-recoverable error
User-recoverable error
User-recoverable error
User-recoverable error
Set paper/Press CONTINUE❂
Load paper❂
Add paper✺
Self test
Sleeping
Please wait
PJL OPMSG/STMSG
Processing
Waiting
FormFeed TimeOut
Option interface Error
Toner low TK-20/Clean printer
Warning/Low memory
Battery error/MEMORY CARD
Format error/MEMORY CARD
Warning battery/MEMORY CARD
Ready
User-recoverable error
User-recoverable error
User-recoverable error
-
-
-
-
-
-
User-recoverable error
User-recoverable error
User-recoverable error
User-recoverable error
User-recoverable error
—
6-13
FS-1750/FS-3750 Series
User-recoverable errors
User-recoverable errors do not normally require a service call unless the suggested remedy does
not solve them. The instructions below indicate how to respond to problems indicated by the
operator panel symbolic indicators and by the panel display.
Troubleshooting
User-recoverable errors
Indicator Corrective action
ATTENTION
Message Corrective action
Flashing
Lit
Fast flashing
Slow flashing
Lit
Flashing
Lit
The printer has run low on toner. The toner should be replaced as soon as
possible.
Install a new toner kit. S ee chapter 1.
There is a paper jam. There is a possibility that paper may be jammed at the
point indicated by flashing, open and remove any jammed paper. See
Section
The paper has run out in the paper cassette or multi-purpose tray. Please
insert paper. See Section
This indicates either the current paper feeder or the paper output point.
The printer has insufficient memory available or the printer is warming up
(Pleasewait). Confirm the message indicated on the message display. See
Section
Note the maintenance message on the message display and consult Table
Top cover Open
Side cover Open Open the side cover, then close tightly.
Paper feed unit Open Open the paper feed unit, then close tig htly.
Face-down tray pap er full The face-down tray has become full (approx. 250 pages). Remove all
Add paper Add paper to the paper cassette or multi-purpose tray.
Set paper/Press CONTINUE Add a sheet of paper to the multi-purpose tray (
Open the top cover, then close tight ly.
printed pages from t he face-down tray. When the printer senses that the
face-down tray is empty again, it will continues printing into the facedown tray. (Model FS-3750 only)
6-14
manual mode
FS-1750/FS-3750 Series
), and press
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