Ricoh LDD250, Service Manual

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SM vii C262/C265
5.5.2 PREPARING TO DOWNLOAD FIRMWARE ..................................5-53
5.5.3 DOWNLOADING THE FIRMWARE TO THE MACHINE ................5-54
5.5.4 ERRORS DURING FIRMWARE UPDATE .....................................5-59
5.6 SP MODE SETTINGS AFTER REPLACING AN NVRAM .......................5-60
5.6.1 NVRAM FOR THE ACU .................................................................5-60
5.6.2 NVRAM FOR THE ECU .................................................................5-60
DETAILED SECTION DESCRIPTIONS
6. DETAILED SECTION DESCRIPTIONS ....................................... 6-1
6.1 MECHANISM OVERVIEW ........................................................................6-1
6.1.1 MAJOR PARTS ................................................................................6-1
6.1.2 ELECTRICAL COMPONENT LAYOUT ............................................6-2
Printed circuit board layout ...................................................................6-2
Scanner Section ...................................................................................6-2
Paper Feed Section ..............................................................................6-3
Drum Unit..............................................................................................6-3
Master Eject, Pressure Cylinder, and Other Sections ...........................6-4
Paper Delivery Section .........................................................................6-4
Master Making Unit ...............................................................................6-5
6.1.3 TABLE OF ELECTRICAL COMPONENTS.......................................6-6
Boards ..................................................................................................6-6
Motors...................................................................................................6-6
Switches ...............................................................................................6-7
Sensors.................................................................................................6-8
Solenoids ............................................................................................6-10
Others .................................................................................................6-10
6.1.4 DRIVE LAYOUT .............................................................................6-11
Overview.............................................................................................6-11
Main Drive...........................................................................................6-12
6.2 SCANNER AND OPTICS ........................................................................6-13
6.2.1 OVERVIEW ....................................................................................6-13
6.2.2 SCANNER DRIVE ..........................................................................6-13
6.2.3 ORIGINAL SIZE DETECTION IN PLATEN MODE.........................6-14
6.2.4 AUTO BACKGROUND CORRECTION ..........................................6-16
6.3 IMAGE PROCESSING ............................................................................6-17
6.3.1 OVERVIEW ....................................................................................6-17
6.3.2 AUTO SHADING ............................................................................6-18
6.3.3 FILTERING.....................................................................................6-19
Types of Filters ...................................................................................6-19
Filters for each Original Type..............................................................6-19
Features of the filters ..........................................................................6-19
6.3.4 MAIN SCAN MAGNIFICATION/REDUCTION ................................6-19
6.3.5 CENTERING ..................................................................................6-20
6.3.6 BINARY PROCESSING .................................................................6-20
6.3.7 ERASE SHADOW ..........................................................................6-20
6.3.8 MEMORY FUNCTION ....................................................................6-21
6.4 THERMAL HEAD ....................................................................................6-22