Ricoh C231 Service Manual page 24

6.4 IMAGE PROCESSING ............................................................................6-13
6.4.1 OVERVIEW ....................................................................................6-13
6.4.2 AUTO BACKGROUND CORRECTION ..........................................6-14
6.4.3 AUTO SHADING ............................................................................6-14
6.4.4 MTF FILTER...................................................................................6-14
6.4.5 MAIN SCAN ENLARGEMENT/REDUCTION .................................6-14
6.4.6 BINARY PROCESSING .................................................................6-15
6.4.7 FINE MODE....................................................................................6-15
6.4.8 THERMAL HEAD............................................................................6-16
Specifications......................................................................................6-16
Thermal head control ..........................................................................6-16
Thermal head protection .....................................................................6-16
Remarks for Handling the Thermal Head............................................6-17
6.5 MASTER FEED .......................................................................................6-18
6.5.1 OVERVIEW ....................................................................................6-18
Procedure ...........................................................................................6-18
6.5.2 MASTER FEED MECHANISM .......................................................6-19
Mechanism .........................................................................................6-19
Procedure ...........................................................................................6-19
Notes ..................................................................................................6-19
6.5.3 CLAMPER AND TENSION ROLLER MECHANISM.......................6-20
Mechanism .........................................................................................6-20
Notes ..................................................................................................6-20
6.5.4 CUTTER MECHANISM ..................................................................6-21
6.5.5 MASTER SET COVER SENSOR ...................................................6-21
6.6 DRUM......................................................................................................6-22
6.6.1 OVERVIEW ....................................................................................6-22
Procedure ...........................................................................................6-22
Notes ..................................................................................................6-22
6.6.2 DRUM DRIVE MECHANISM ..........................................................6-23
Mechanism .........................................................................................6-23
Notes ..................................................................................................6-23
6.6.3 INK SUPPLY MECHANISM............................................................6-24
Mechanism .........................................................................................6-24
Notes ..................................................................................................6-24
6.6.4 INK ROLLER MECHANISM ...........................................................6-25
Mechanism .........................................................................................6-25
Notes ..................................................................................................6-25
6.6.5 INK SUPPLY CONTROL ................................................................6-26
Mechanism .........................................................................................6-26
Notes ..................................................................................................6-26
6.6.6 DETECTION OF MASTERS ON THE DRUM ................................6-27
6.7 PAPER FEED..........................................................................................6-28
6.7.1 OVERVIEW ....................................................................................6-28
6.7.2 PAPER FEED MECHANISM ..........................................................6-29
Mechanism .........................................................................................6-29
Notes ..................................................................................................6-29
6.7.3 PAPER FEED / SEPARATION PRESSURE MECHANISM ...........6-30
6.7.4 REGISTRATION ROLLER MECHANISM.......................................6-31
C231/C237/C238/C248/C267
xii
Rev. 01/2006
SM