Ricoh A231 Service Manual - Page 12

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2. DETAILED DESCRIPTION........................................................ 12-7
2.1 ORIGINAL FEED-IN PREPARATION MECHANISM.............................. 12-7
Original Stopper Release (top diagram):............................................ 12-7
Pick-up Roller Release (bottom diagram): ......................................... 12-7
2.2 PICK-UP AND SEPARATION MECHANISM.......................................... 12-8
2.3 ORIGINAL FEED MECHANISM ............................................................. 12-9
2.4 ORIGINAL FEED DRIVE MECHANISM ............................................... 12-10
Original Feed Start ........................................................................... 12-10
Original Feed.................................................................................... 12-10
2.5 ORIGINAL SIZE DETECTION .............................................................. 12-11
2.6 ORIGINAL TRANSPORT MECHANISM............................................... 12-12
2.7 ORIGINAL SKEW CORRECTION MECHANISM ................................. 12-13
2.8 ORIGINAL INVERSION AND FEED-OUT MECHANISM ..................... 12-14
2.8.1 GENERAL OPERATION.............................................................. 12-14
2.8.2 ORIGINAL INVERSION MECHANISM ........................................ 12-15
2.8.3 ORIGINAL EXIT MECHANISM
(SINGLE-SIDED ORIGINAL MODE) ........................................... 12-16
2.8.4 ORIGINAL EXIT MECHANISM
(DOUBLE-SIDED ORIGINAL MODE).......................................... 12-17
2.9 STAMP ................................................................................................. 12-18
2.10 JAM CONDITIONS ............................................................................. 12-19
2.11 TIMING CHARTS ............................................................................... 12-20
2.11.1 A4 SIDEWAYS: ONE-SIDED ORIGINAL
(3 ORIGINALS).......................................................................... 12-20
2.11.2 A4 SIDEWAYS: TWO-SIDED ORIGINAL
(2 ORIGINALS).......................................................................... 12-21

3. SERVICE TABLES .................................................................. 12-22

3.1 DIP SWITCHES.................................................................................... 12-22
3.2 TEST POINTS ...................................................................................... 12-22
3.3 VARIABLE RESISTORS....................................................................... 12-22
3.4 FUSES.................................................................................................. 12-22
4. REPLACEMENT AND ADJUSTMENT.................................... 12-23
4.1 COVER REPLACEMENT ..................................................................... 12-23
Front Cover Removal ....................................................................... 12-23
Rear Cover Removal........................................................................ 12-23
Left Cover Removal ......................................................................... 12-23
Upper Exit Cover Removal............................................................... 12-23
Original Tray Removal ..................................................................... 12-23
Upper Cover Removal...................................................................... 12-23
4.2 FEED UNIT REMOVAL AND SEPARATION ROLLER
REPLACEMENT ................................................................................... 12-24
4.3 FEED BELT REPLACEMENT .............................................................. 12-25
4.4 SENSOR REPLACEMENT................................................................... 12-26
4.4.1 ORIGINAL SET, ORIGINAL WIDTH AND
REGISTRATION SENSORS ....................................................... 12-26
Original Set Sensor .......................................................................... 12-26
SM
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A230/A231/A232