Ricoh Aficio MP 2550B, Service Manual

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SM ix D017/D018/D019/D020
5.13.4 NEW DEBUG LOG CODES.....................................................5-223
SP5857-015 Copy SD Card-to-SD Card: Any Desired Key ..............5-223
SP5857-016 Create a File on HDD to Store a Log ...........................5-223
SP5857-017 Create a File on SD Card to Store a Log .....................5-223
DETAILED SECTION DESCRIPTIONS
6. DETAILED SECTION DESCRIPTIONS ....................................... 6-1
6.1 OVERVIEW ................................................................................................6-1
6.1.1 MECHANICAL COMPONENTS ........................................................6-1
6.1.2 PAPER PATH....................................................................................6-3
6.1.3 ELECTRICAL COMPONENT DESCRIPTIONS ................................6-4
6.1.4 DRIVE LAYOUT ..............................................................................6-11
6.2 BOARD STRUCTURE..............................................................................6-12
6.2.1 MAIN BOARDS ...............................................................................6-12
6.2.2 CONTROLLER BOARD ..................................................................6-14
6.3 COPY PROCESS .....................................................................................6-16
6.4 SCANNING...............................................................................................6-18
6.4.1 OVERVIEW .....................................................................................6-18
6.4.2 SCANNER DRIVE ...........................................................................6-19
6.4.3 ORIGINAL SIZE DETECTION.........................................................6-20
6.4.4 ANTI-CONDENSATION HEATER...................................................6-21
6.5 IMAGE PROCESSING .............................................................................6-22
6.5.1 OVERVIEW .....................................................................................6-22
6.5.2 SBU (SENSOR BOARD UNIT)........................................................6-23
Monochrome Scanner Unit .................................................................6-23
Color Scanner Unit..............................................................................6-24
6.5.3 AUTO IMAGE DENSITY .................................................................6-25
6.5.4 ORIGINAL TYPE SETTINGS ..........................................................6-26
6.5.5 IPU (IMAGE PROCESSING UNIT) .................................................6-27
Overview.............................................................................................6-27
6.6 LASER EXPOSURE .................................................................................6-29
6.6.1 OVERVIEW .....................................................................................6-29
6.6.2 AUTO POWER CONTROL (APC)...................................................6-30
6.6.3 LD SAFETY SWITCH......................................................................6-31
6.7 PHOTOCONDUCTOR UNIT (PCU) .........................................................6-32
6.7.1 OVERVIEW .....................................................................................6-32