Ricoh C231 Service Manual page 14

Original Background Correction..........................................................2-12
Peak Hold ...........................................................................................2-12
2.2.3 BINARY PROCESSING .................................................................2-13
Data Compensation Processing .........................................................2-13
MTF Correction ...................................................................................2-14
Binary Processing in Letter/Photo Mode.............................................2-14
Error Diffusion .....................................................................................2-15
2.2.4 MAIN SCAN MAGNIFICATION ......................................................2-16
2.2.5 IMAGE POSITION ADJUSTMENT IN THE MAIN
SCAN DIRECTION.........................................................................2-17
2.2.6 PASTE SHADOW ERASE MODE ..................................................2-17
2.2.7 THERMAL HEAD............................................................................2-18
Specifications......................................................................................2-18
Thermal Head Control.........................................................................2-18
Thermal Head Protection ....................................................................2-18
Remarks for Handling the Thermal Head............................................2-19
2.3 MASTER EJECT .....................................................................................2-20
2.3.1 OVERALL .......................................................................................2-20
2.3.2 MASTER CLAMPER OPEN MECHANISM ....................................2-21
Drum Position Lock Mechanism .........................................................2-21
2.3.3 MASTER EJECT ROLLER MECHANISM ......................................2-22
2.3.4 PRESSURE PLATE MECHANISM.................................................2-23
2.4 MASTER FEED .......................................................................................2-24
2.4.1 OVERALL .......................................................................................2-24
2.4.2 MASTER FEED MECHANISM .......................................................2-25
2.4.3 MASTER CLAMPER OPERATION AND TENSION ROLLER
RELEASE MECHANISM ................................................................2-26
2.4.4 CUTTER MECHANISM ..................................................................2-27
2.5 DRUM......................................................................................................2-28
2.5.1 OVERALL .......................................................................................2-28
2.5.2 DRUM DRIVE MECHANISM ..........................................................2-29
2.5.3 INK SUPPLY MECHANISM............................................................2-30
2.5.4 INK ROLLER MECHANISM ...........................................................2-31
2.5.5 INK SUPPLY CONTROL ................................................................2-32
2.5.6 DETECTION OF MASTERS ON THE DRUM ................................2-33
2.6 PAPER FEED..........................................................................................2-34
2.6.1 OVERALL .......................................................................................2-34
2.6.2 PAPER FEED MECHANISM ..........................................................2-35
2.6.3 PAPER FEED/SEPARATION PRESSURE ADJUSTMENT
MECHANISM .................................................................................2-36
2.6.4 REGISTRATION ROLLER MECHANISM.......................................2-37
Registration Roller Drive .....................................................................2-37
Registration Roller Up/Down Mechanism ...........................................2-38
2.6.5 PRINTING PRESSURE MECHANISM ...........................................2-39
2.6.6 PAPER TABLE MECHANISM ........................................................2-40
Table Up and Down Mechanism .........................................................2-40
Paper End Detection Mechanism .......................................................2-40
Paper Table Side Fence Mechanism ..................................................2-41
Paper Table Side-to-Side Shift Mechanism ........................................2-41
C231/C237/C238/C248/C267
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SM