Ricoh B173 Service Documentation page 17

6.2.1 FEEDING SECTION.........................................................................6-2
6.2.2 TRANSFER ASSEMBLY ..................................................................6-2
6.2.3 DRIVER ASSEMBLY........................................................................6-2
6.2.4 FUSING ............................................................................................6-3
Thermostat............................................................................................6-3
Thermistor.............................................................................................6-3
Heat Roller............................................................................................6-3
Pressure roller ......................................................................................6-3
Safety Features ....................................................................................6-3
6.2.5 SCANNER ........................................................................................6-4
Hardware: .............................................................................................6-4
Mechanical:...........................................................................................6-4
6.2.6 LSU (LASER SCANNER UNIT)........................................................6-4
6.3 CRU (ALSO KNOWN AS AIO) ..................................................................6-5
6.3.1 NEW CRU (AIO) DETECTION .........................................................6-6
6.3.2 TONER END DETECTION...............................................................6-6
6.4 MAIN BOARD............................................................................................6-7
6.4.1 ASIC (CHORUS2) ............................................................................6-7
Main function block ...............................................................................6-7
6.4.2 FLASH MEMORY .............................................................................6-8
6.4.3 SDRAM.............................................................................................6-8
6.4.4 SENSOR INPUT CIRCUIT ...............................................................6-8
Paper Empty Sensor:............................................................................6-8
MP Sensing: .........................................................................................6-8
Paper Feed and Toner Cartridge Sensor:.............................................6-8
Paper Exit Sensor: ................................................................................6-8
Cover Open Sensor: .............................................................................6-9
DC FAN / SOLENOID Drive:.................................................................6-9
Motor Drive: ..........................................................................................6-9
6.5 SMPS & HVPS (ALSO KNOWN AS PSU AND POWER PACK).............6-10
6.5.1 HVPS (HIGH VOLTAGE POWER SUPPLY) ..................................6-10
6.5.2 SMPS (SWITCHING MODE POWER SUPPLY) ............................6-11
6.6 ENGINE F/W ...........................................................................................6-12
6.6.1 FEEDING........................................................................................6-12
Jam 0 ..................................................................................................6-12
Jam 1 ..................................................................................................6-12
Jam 2 ..................................................................................................6-12
6.6.2 DRIVE.............................................................................................6-12
6.6.3 TRANSFER ....................................................................................6-12
6.6.4 FUSING ..........................................................................................6-13
Error Type...........................................................................................6-13
6.6.5 LSU.................................................................................................6-13
Error Type...........................................................................................6-13
6.7 LIU BOARD .............................................................................................6-14
6.8 OPE BOARD ...........................................................................................6-14
SM v B173