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FAX-2840
Service manual
Brother FAX-2840 Service Manual page 265
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Also See for FAX-2840
:
Basic user's manual
(143 pages)
,
Advanced user's manual
(56 pages)
,
Quick setup manual
(16 pages)
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Contents
Table of Contents
Troubleshooting
Bookmarks
Table of Contents
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1. WIRING DIAGRAM
Wiring diagram
REG_F
ADF COVER SENSOR
LCD
HVPS
CN1
CN2
1
FUSER_FAN_VCC
PGND
FUSER_FAN_SEN
3
FUSER_FAN_SEN
FAN
SW
COVER OPEN SW
DX
SW
sensor
Fuser
Thermistor
(Center)
Unit
Thermostat
TAB
TAB
Thermistor
(Edge)
TAB
Halogen
heater
TAB
TAB
TAB
UL1061
AWG#28
Relay
Triac
+3.3V
F2,3
F1
(LIVE)
(NEUTRAL)
PANEL PCB
CN4
CN
+5V
1
1
RESPONSE
COMMAND
PNL_CLK
GND
+3.3V
REG_R
SEN_REAR
SEN_FRONT
8
8
CN24
1
2
THERMISTOR
CN25
1
2
CN17
TNRLED_ON
1
1
+24V
+24V
FUSER_FAN
DISCHG-PRE
HV_ENABLE
GRIDC
FB_GRID
FB_DEV
FB_TRCCV
FB_TRCC
+3.3V
PWM_CHG
PWM_DEV
PWM_TRCC
PWM_TRCV
PGND
GND
+3VI
20
20
Eject-sensor
CN4
CN3
CN13
LED_VCC
1
2
DX_SEN
1
1
GND
GND
EJECT_SEN
DX_SEN
THM_FUSER_C
EJECT
+3.3V
THM_FUSER_E
+3.3V
8
8
CN2
2
THM_C
1
+3.3V
CN1
2
THM_E
1
+3.3V
CN1
REG_F
REG_R
4
GND
REG_R_SEN
LED VCC
Regist
1
REG_F_SEN
F/R sensor
B512315
CN102
CN14
UL1061
AWG#28
1
AC_ZEROX
1
HEAT_ON
HEAT_ON
RELAY1
RELAY2
REG_R_SEN
LED VCC
REG_F_SEN
7
VDD_CTRL_LV0
8
8
UL1061
CN15
CN101
AWG#22
1
S0V
1
+3.3V
P0V
+24V
+24V
+24V
+8V
P0V
+8V
7
7
HEAT_ON
LVPS
CN6
/B
4
B
/A
A
1
+5V
PNL_CLK
CN5
COMMAND
FG
12
RESPONSE
R-GND
GND
G-GND
+3.3V
B-GND
SEN_REAR
VLED
+5V(VDD_RHS)
CLK
TG
VREF
R3V
GND
MODE
AO
1
ADF COVER
GND
CN3
2
VOUT1
1
VOUT2
+3.3V
STHM
CN20
GIJI
1
TELOFF
MDM_MONI
CSn
RIn
RESETn
IRQ
GND
SPICLK
GND
SPIDO
+
3
.
3
V
SPIDI
GND
+24V
15
TNRLED_ON
+24V
CN22
+24V
2
GND
FUSER_FAN
1
HOOK
FUSER_FAN_SEN
DISCHG-PRE
HV_ENABLE
CN11
GRIDC
+24V
2
FB_GRID
REG_CLU
1
FB_DEV
FB_TRCCV
FB_TRCC
CN10
+3.3V
2
+24V
PWM_CHG
T1_CLU
1
PWM_DEV
PWM_TRCC
PWM_TRCV
CN9
PGND
GND
HU+
1
HU-
HV+
+3VI
HV-
HW+
HW-
GND
+3.3V
U
U
U
LED_VCC
V
V
GND
V
EJECT_SEN
W
W
DX_SEN
W
THM_FUSER_C
FG+
19
+3.3V
FG-
THM_FUSER_E
CN12
+3.3V
18
CENTER TAP
COIL U
COIL U
COIL V
COIL V
COIL W
COIL W
FG
11
BDN
10
+3.3V
LD_OFF
ENABLE
LD_REF
GND
VdoData_P
VdoData_N
GND
AC_ZEROX
+3VI
1
HEAT_ON
RELAY1
CN16
RELAY2
GND
1
TNR_SEN
REG_F_SEN
LED_VCC
LED VCC
PNEW_SEN
(26ppm model only)
PEDGE_SEN
5
REG_R_SEN
VDD_CTRL_LV0
CN19
Ethernet
(NETWORK MODEL
S0V
ONLY)
+3.3V
+3.3V
CN18
P0V
+24V
+24V
USB
Function
+24V
+8V
P0V
+8V
MAIN PCB
6-1
ADF MOTOR
CIS
SPEAKER
MODEM PCB
1
GIJI
TELOFF
MDM_MONITOR
RESETn
CSn
RIn
IRQ
GND
SCK
GND
SDO
+
3
.
3
V
SDI
GND
15
+24V
HOOK PCB
2
GND
(H/S MODEL ONLY)
1
HOOK
Regist
CLUTCH
Paper Feed
CLUTCH
HU+
1
Main
HU-
Motor Unit
HV+
HV-
HW+
HW-
GND
VCC3
U
U
U
V
V
V
W
W
W
FG+
19
FG-
1
CENTER TAP
Polygon
COIL U
Motor Unit
COIL U
COIL V
COIL V
COIL W
COIL W
8
FG
9
BDN
+3.3V
LD_OFF
ENABLE
LD_REF
GND
LVDS
VdoData_P
LVDS
VdoData_N
GND
18
+3VI
LD CTRL PCB
PE NEW SENSOR PCB
1
GND
CN2
LED VCC
1
TNR_SEN
GND
LED_VCC
PEDE_SEN
3
PNEW_SEN
PEDGE_SEN
5
Confidential
LINE
EXTERNAL
TELPHONE
H/S
Table of
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Chapters
Table of Contents
4
Chapter 1 Specifications
21
Chapter 2 Troubleshooting
36
Chapter 3 Disassembly/Reassembly
123
Chapter 4 Adjustments and Updating Settings As Required After Parts Replacement
205
Chapter 5 Service Functions
218
Table of Contents
Troubleshooting
CHAPTER 2 TROUBLESHOOTING
35
Paper Feeding Troubleshooting
97
Image Defect Troubleshooting
101
Troubleshooting according to image defect
102
Software Setting Troubleshooting
113
Document Feeding Troubleshooting
114
Scanning Image Defect Troubleshooting
115
Control Panel Troubleshooting
118
Troubleshooting of FAX/Telephone Problems
119
Other Troubleshooting
121
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This manual is also suitable for:
Fax-2845
Fax-2990
Fax-2890
Fax-2940
Fax-2950
Mfc-7240
...
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