Ricoh C249 Service Manual page 221

5.9.3 SP8-2: UPLOAD MAIN FIRMWARE...............................................5-31
5.9.4 SP8-10: TEST PATTERNS ............................................................5-31
5.9.5 SP 8-18 - TEMPORARY SECURITY OFF......................................5-31
5.9.6 SP8-21: PAPER FEED TEST (15 RPM).........................................5-32
5.9.7 SP8-22: FREE RUN PAPER FEED (15 RPM) ...............................5-32
5.9.8 SP8-23: 30-45-60 RPM PRINT MODE ...........................................5-32
6. DETAILED SECTION DESCRIPTIONS ....................................... 6-1
6.1 MECHANISM OVERVIEW ........................................................................6-1
6.1.1 COMPONENT LAYOUT ...................................................................6-1
6.1.2 ELECTRICAL COMPONENT LAYOUT ............................................6-2
Boards ..................................................................................................6-4
Motors...................................................................................................6-4
Sensors.................................................................................................6-5
Solenoids ..............................................................................................6-5
Switches ...............................................................................................6-6
Counters ...............................................................................................6-6
Others ...................................................................................................6-6
6.1.3 DRIVE LAYOUT ...............................................................................6-7
6.2 MASTER EJECT UNIT ..............................................................................6-8
6.2.1 OVERVIEW ......................................................................................6-8
Overview...............................................................................................6-8
Procedure .............................................................................................6-8
6.2.2 MASTER CLAMPER OPENING MECHEANISM..............................6-9
Clamper Mechanism .............................................................................6-9
6.2.3 MASTER EJECT ROLLER MECHANISM ......................................6-10
Mechanism .........................................................................................6-10
Procedure ...........................................................................................6-10
6.2.4 PRESSURE PLATE MECHANISM.................................................6-11
Mechanism .........................................................................................6-11
Procedure ...........................................................................................6-11
6.3 SCANNER UNIT......................................................................................6-12
6.3.1 OVERVIEW ....................................................................................6-12
6.4 IMAGE PROCESSING ............................................................................6-13
6.4.1 OVERVIEW ....................................................................................6-13
6.4.2 MTF FILTER...................................................................................6-14
6.4.3 SMOOTHING FILTER ....................................................................6-14
6.4.4 MAIN SCAN ENLARGEMENT/REDUCTION .................................6-14
6.4.5 THERMAL HEAD............................................................................6-15
Specifications......................................................................................6-15
Thermal head control ..........................................................................6-15
Thermal head protection .....................................................................6-15
6.5 MASTER FEED .......................................................................................6-16
6.5.1 OVERVIEW ....................................................................................6-16
Procedure ...........................................................................................6-16
6.5.2 AUTO ADJUSTABLE MASTER SET..............................................6-17
Procedure ...........................................................................................6-17
6.5.3 THERMAL HEAD DRIVING MECHANISM.....................................6-18
Mechanism .........................................................................................6-18
SM v C264