4 Electronic Circuit Description and Diagrams

4.1. Block Diagram

Noise
Filter
Rectifier
Thermistor
Voltage Control
Circuit Voltage
Detector
+24V
+5V
Fuser Driver Heat Lamp
Thermal
Fuse
Thermostat
Thermister
TH
+24V IR
nCHGCTL
nDBCTL
nTRCTL
nDB
nTR
TE_LED Charger
Current
Grid Voltage
Transfer (+, - 2 way)
OPC
Drum
DEV BIAS Toner
Box
Developer
High Voltage
Circuit
Front Door
Interlock Switch
+24V IR
+24V
+5VGND
Temp. Limit
Fuser
Control
Circuit HV Driver
TH from Thermister nFSRCTL
OPC Drum Unit
Interlock Switch
+5V
LD
Driver
+5V IR
nHSYNC
nVIDEO
nLDENB
nADJUST
+24V IR
APC
Controller
KME_ASIC
nHSYNC
nVIDEO
TH
DOPEN
+24V IR
53.84MHz
Dot Clock
13.46 MHz x 4
ASIC1 IC3
Video
I/F
Parallel
I/F
Decomp.
Circuit
DMA Arbitor
I/O Exit
DRAM
Controller
TTL
TTL
Parallel
Print Data
Status Data
TTL
DRAM 2MB
1MW x 16bit
12MHz
ROM 4KB
RAM
128 BYTE
CPU IC1
RST
nRST
LED Driver
Ready Error Toner/Process Switch
Indicator Board Top
Sensor
Registration
Sensor
nREGSEN
nEXITSEN
RESET IC
12MHz Clock
Exit
Sensor
Toner Empty
(TE) Sensor 
A
B
Bipoler
Driver
A
B
nCS
SCK2
SO2
SI2
ROM
16KB
RAM
512 Byte
CPU PUCTL
REGCTL
EXITCTL
REF CTL +24V IR
Pick Driver
Regist Driver
Exit Driver
+24V
+24V
Pick Solenoid
Regist Solenoid
Switchback Solenoid

M

SNRCLK
nSNRCNT
nSNRLK
PUNIT
nPRINT
nPURGEnTOPPPRDY
nPRDY
Direct
Comm.
EEPCS
EEPCLK
EEPDO
EEPDI
EEPROM
2 k bit
PSAVE
CCLK
nSBSY
nCBSY
SXD
CXD
Serial
Comm.
nRST
to USB Chip
12MHz
MPU I/F
12MHz Clock
USB-Parallel
Bridge Chip
D+
D-
PV-EPP
Conv.
Cotrol
Signals
Cotrol
Signals
Data Signals
USB
2ch Stepping
Motor Controller
CH1
CH2
nTOPSEN
Centronics-USBData Selector&DRAM RAS-CASGeneraterVideo Signals
Power Supply Unit Fuser Unit
Main Control Board
High Voltage Supply
OPC Drum Unit
LSU
FAN
Control Circuit
FANERR
FANPWR FAN
FAN
ERR
FANCTL
+24V IR
TESEN
IC11IC9IC5
IC6
IC6
IC6 IC10IC12
IC6
IC6
IC4
+24V
49
KX-P7100