Ricoh AC205 Service Manual - Page 17

DETAILED DESCRIPTIONS, Transfer High Voltage THV - all in one laser printer

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DETAILED DESCRIPTIONS 6. DETAILED DESCRIPTIONS 6-1 6.1 PRINTER COMPONENT LAYOUT 6-1 6.1.1 FRONT VIEW 6-1 6.1.2 REAR VIEW 6-2 6.2 SYSTEM LAYOUT 6-3 6.2.1 PAPER FEED 6-3 6.2.2 TRANSFER ASSEMBLY 6-3 6.2.3 DRIVE ASSEMBLY 6-3 6.2.4 FUSING ASSEMBLY 6-4 Thermostat 6-4 Thermistor 6-4 Hot Roller 6-4 Pressure Roller 6-4 Safety Features 6-4 Safety Devices 6-4 6.2.5 SCANNING UNIT 6-5 CCD Module Specifications 6-5 6.2.6 LASER SCANNING UNIT (LSU 6-5 6.2.7 TONER CARTRIDGE 6-6 6.2.8 NEW AIO DETECTION 6-7 6.2.9 TONER END DETECTION 6-7 6.3 CONTROLLER 6-8 6.3.1 MAIN PBA 6-8 6.3.2 ASIC 6-9 Main Function Block 6-9 6.3.3 MEMORY 6-9 6.3.4 FLASH MEMORY 6-9 6.3.5 SDRAM 6-9 6.3.6 BATTERY BACKUP 6-9 6.3.7 SENSOR INPUT CIRCUIT 6-10 Paper Empty Sensor 6-10 By-pass Tray Sensor 6-10 Paper Feed Sensor 6-10 Paper Exit Sensor 6-10 Cover Open Sensor 6-10 DC Fan/Solenoid Driving 6-10 Motor Driving 6-10 6.4 SMPS AND HVPS 6-11 6.4.1 HVPS 6-12 Transfer High Voltage (THV 6-12 Charge Voltage (MHV 6-12 Cleaning Voltage (THV 6-12 Developing Voltage (DEV 6-12 Supply Voltage (SUP 6-13 OPC Ground ZENER Voltage 6-13 6.4.2 SMPS(SWITCHING MODE POWER SUPPLY 6-14 SM v B273

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SM
v
B273
DETAILED DESCRIPTIONS
6.
DETAILED DESCRIPTIONS
........................................................
6-1
6.1
PRINTER COMPONENT LAYOUT
...........................................................
6-1
6.1.1
FRONT VIEW
...................................................................................
6-1
6.1.2
REAR VIEW
.....................................................................................
6-2
6.2
SYSTEM LAYOUT
....................................................................................
6-3
6.2.1
PAPER FEED
...................................................................................
6-3
6.2.2
TRANSFER ASSEMBLY
..................................................................
6-3
6.2.3
DRIVE ASSEMBLY
..........................................................................
6-3
6.2.4
FUSING ASSEMBLY
........................................................................
6-4
Thermostat
............................................................................................
6-4
Thermistor
.............................................................................................
6-4
Hot Roller
..............................................................................................
6-4
Pressure Roller
.....................................................................................
6-4
Safety Features
....................................................................................
6-4
Safety Devices
......................................................................................
6-4
6.2.5
SCANNING UNIT
.............................................................................
6-5
CCD Module Specifications
..................................................................
6-5
6.2.6
LASER SCANNING UNIT (LSU)
......................................................
6-5
6.2.7
TONER CARTRIDGE
.......................................................................
6-6
6.2.8
NEW AIO DETECTION
....................................................................
6-7
6.2.9
TONER END DETECTION
...............................................................
6-7
6.3
CONTROLLER
..........................................................................................
6-8
6.3.1
MAIN PBA
........................................................................................
6-8
6.3.2
ASIC
.................................................................................................
6-9
Main Function Block
..............................................................................
6-9
6.3.3
MEMORY
.........................................................................................
6-9
6.3.4
FLASH MEMORY
.............................................................................
6-9
6.3.5
SDRAM
.............................................................................................
6-9
6.3.6
BATTERY BACKUP
.........................................................................
6-9
6.3.7
SENSOR INPUT CIRCUIT
.............................................................
6-10
Paper Empty Sensor
...........................................................................
6-10
By-pass Tray Sensor
..........................................................................
6-10
Paper Feed Sensor
.............................................................................
6-10
Paper Exit Sensor
...............................................................................
6-10
Cover Open Sensor
............................................................................
6-10
DC Fan/Solenoid Driving
....................................................................
6-10
Motor Driving
......................................................................................
6-10
6.4
SMPS AND HVPS
...................................................................................
6-11
6.4.1
HVPS
..............................................................................................
6-12
Transfer High Voltage (THV+)
............................................................
6-12
Charge Voltage (MHV)
........................................................................
6-12
Cleaning Voltage (THV-)
.....................................................................
6-12
Developing Voltage (DEV)
..................................................................
6-12
Supply Voltage (SUP)
.........................................................................
6-13
OPC Ground ZENER Voltage
.............................................................
6-13
6.4.2
SMPS(SWITCHING MODE POWER SUPPLY)
.............................
6-14