Service manual

Circuit Description
3-1
3. Circuit Description
3-1 Main PBA
3-1-1 Summary
The main circuit that consists of CPU, MFP controller (built-in 32bit RISC processor core: ARM946ES) includ-
ing various I/O device drivers, system memory, scanner, printer, motor driver, PC I/F, and FAX transceiver con-
trols the whole system. The entire structure of the main circuit is as follows :
SDRAM DIMM
16MB
CN15(100P)
Flash DIMM
PS3
(2MB)
CN15(100P)
DEV MOTOR
SMPS / HVPS
+5V/+24V/+12V/+24Vs /Fuser
M
H
V
DE V
SUPPLY
BLADE
T
H
V
8P
FAN1
TONER_TX
TONER_RX
PTL
SOLENO ID
PICK_UP,DUPLEX,MP
PAPER
SENSOR
FEED+P.EMP,EXIT,MP
COVER OPEN
S/W
+24 V / +5V
LSU
11P
THERMISTOR
2P
3P
DEV_ID
3P
3P
4P
2P
4P
CCD MODULE
24P
22P
1
4P
FLAT MOTOR
5P
15P D -SUB
Option
MOTOR
DRIVER
3P x 2EA
MICOM
- LCD Drive
- Key Scan
LCD 20x2line
OPE
External
Auditron
D-SUB
CONN.
MODEM
EXT_PHONE
SEPRATING
PART
EXTERNAL
PHONE
INTERFACE
PART
EXTERNAL
PHONE
600/ / 600
Tx: Rx
TRANSFORMER
LINE
INT ERFACE
LINE1
10 P
FAN1
3P
FEED MOTOR
10P
C
N
1
4
C
N
3
3
C
N
2
1
C
N
6
C
N
1
0
C
N
2
3
C
N
1
1
C
N
7
C
N
4
C
N
1
8
C
N
2
9
C
N
2
6
CN 2 2
USB CABLE
CN 2 7
CN 3 0
CN 2 0 CN 2 4CN 3
CN 1
CN 2 8
Network CARD
CN8
OU T BIN F ULL
PCNT
DEV CNT
OPC
HYPER
SCF
C
N
3
1
C
N
2
5
C
N
1
9
C
N
1
7
C
N
1
6
C
N
1
3
C
N
5
C
N
1
2
C
N
1
9
36 P
8P
4P
2P
4P
4P
2P
4P
2P
2P
6P
2P
3P
3P
CN2
SCAN
MAIN PBA
CENTRONICS
CABLE
LIU
Platen
ADF
DADF MOTOR
PAPER SENSOR
POS,DET
<Block Diagram>