AR-M550 (serv.man5). CIRCUIT DIAGRAM - Sharp Copying Equipment Service Manual (repair manual). Page 10

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AR-550/555/620/625/700/705  BLOCK DIAGRAM / 
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4. PCU PWB
ADDRESS(A0 
– A20)
DATA(D0 
– D15)
System 
CLOCK
CLOCK
Analog output
DATA,CLOCK
PCU_RESET
RESET
UART
UART(DTR, DSR)
RES
POF
Clutch, solenoid, relay
Brushless motor, LED,
+24V1
+5V2
+12V2
+3.3V1
FW
RESET
ANALOG-OUT
FWS
Analog input (Fusing thermistor)
High 
temperature 
protection
Thermistor open detection 
Thermistor open detection
Fusing control signal 
DATA,
CLOCK
Oscillator
(LSU,MOTOR,PWM)
UART(TXD,RXD)
UART(DTR,DSR)
+5VLD
+12VS power
+5VS power
PROFF_CNT,PRON_FAX
DC power
Analog 
power
(Vref)
+12V2
+5VS power
FW-SUB
+12VS power
Brush motor
Synchronous motor
(PPD, ADU/DV signal)
Sensor input
High voltage trouble detection
PGM clock, control signal 
DCCNT (Power relay control)
Fusing thermistor
Temperature/humidity 
sensor
AC voltage monitor
Process/developing 
unit signal 
Analog input
Power switch 
monitor 
(MSW-MON)
/PCU_RESET
System
CLOCK
CLOCK
UART(TXD,RXD)
(LCC, FINISHER,
INSERTER)
(LCC, FINISHER,
INSERTER)
(LCC, FINISHER,
INSERTER)
High voltage control signal (Enable, PWM output)
Brushless motor
Clutch, solenoid, relay
PWM output 
(FAN)
Sensor input
+24V1
+24V
(Interlock line)
Flash ROM write control (FWP)
(Interlock line)
+24V
(Interlock line)
+24V
(Interlock line)
+24V
BD, control signal, VIDEO signal
Paper width detection
+24V
(Interlock line)
Door open/close detection (Interlock switch)
Sensor input (Manual unit)
Sensor input
PWM output (FAN)
FWS
Fusing control signal 
Option detection
CLOCK
Fusing heater control
Direct control mode 
select signal
+38V monitor
INT_PR (Relay)
BUP_PR (Relay)
HSYNC, PAGE
VIDEO signal
(+12VS power monitor)
/PCU_RESET
Stepping motor control signal
Fusing 
control 
signal 
Fusing heater 
relay control 
I/O
I/O
PMC
ANALOG
IC
SWITCH
OP-AMP
OP-AMP
XTAL
COMPARATOR
ROM
FLASH
COMPARATOR
EEPROM
OSC
COMPARATOR
BUCKUP CIRCUIT
IC
REGURATOR-
OP-AMP
ASIC
ASIC
FPGA
CPU
DACs
S-RAM
SWITCH
DOOR
GATE-ARRAY
DRIVE
CIRCUIT
COMPARATOR
DCPS
PCU
LSU
HV un
AC PWB
CONTROLLER
SUB DCPS
SUB DCPS
PWB
DRIVER
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