Ricoh G147 Service Manual page 17

5.11.2 I/O BOARD: DIP SW101 ........................................................5-121
5.12 USING DEBUG LOG .....................................................................5-122
5.12.1 SETTING UP "SAVE DEBUG LOG".......................................5-122
5.12.2 RETRIEVING THE DEBUG LOG FROM THE HDD...............5-128
5.12.3 MORE ABOUT DEBUG LOG .................................................5-128
DETAILED DESCRIPTIONS
6. DETAILED DESCRIPTIONS ................................................... 6-1
6.1 MACHINE OVERVIEW..........................................................................6-1
6.1.1 COMPONENT LAYOUT...............................................................6-1
6.1.2 PAPER PATH...............................................................................6-3
6.1.3 DRIVE LAYOUT ...........................................................................6-4
6.2 BOARD LAYOUT ..................................................................................6-5
6.2.1 BOARD BLOCK DIAGRAM..........................................................6-5
6.2.2 CONTROLLER BLOCK DIAGRAM ..............................................6-7
6.3 PRINTING PROCESS OVERVIEW.....................................................6-10
6.4 LASER EXPOSURE............................................................................6-12
6.4.1 LASER EXPOSURE OVERVIEW...............................................6-12
6.4.2 AUTO POWER CONTROL (APC)..............................................6-13
6.4.3 DUAL-BEAM WRITING ..............................................................6-13
6.4.4 LASER BEAM PITCH CHANGE MECHANISM..........................6-14
6.4.5 LD SAFETY SWITCHES ............................................................6-15
6.5 PHOTOCONDUCTOR UNIT (PCDU)..................................................6-16
6.5.1 OVERVIEW OF THE PCDU .......................................................6-16
6.5.2 DRUM DRIVE MECHANISM......................................................6-17
6.5.3 DRUM PAWLS ...........................................................................6-17
6.5.4 DRUM TONER SEALS...............................................................6-18
6.5.5 NEW PCDU UNIT DETECTION .................................................6-18
6.6 DRUM CHARGE .................................................................................6-21
6.6.1 OVERVIEW OF DRUM CHARGE ..............................................6-21
6.6.2 CHARGE ROLLER VOLTAGE CORRECTION ..........................6-22
6.6.3 ID SENSOR PATTERN PRODUCTION TIMING........................6-23
6.6.4 DRUM CHARGE ROLLER CLEANING......................................6-25
6.7 DEVELOPMENT .................................................................................6-26
6.7.1 OVERVIEW OF DEVELOPMENT ..............................................6-26
6.7.2 DRIVE MECHANISM..................................................................6-27
6.7.3 DEVELOPER MIXING................................................................6-27
6.7.4 DEVELOPMENT BIAS ...............................................................6-28
6.7.5 TONER SUPPLY........................................................................6-29
6.7.6 TONER NEAR END/END DETECTION .....................................6-32
6.7.7 TONER END RECOVERY .........................................................6-32
6.7.8 TONER SUPPLY WITH ABNORMAL SENSORS ......................6-33
6.8 DRUM CLEANING AND TONER RECYCLING...................................6-34
6.8.1 DRUM CLEANING .....................................................................6-34
6.8.2 TONER RECYCLING .................................................................6-35
SM v G147