Ricoh TH-C1b Service Manual page 6

3.11.3 MAIN MOTOR ..............................................................................3-54
3.11.4 PCU GEAR BOX ..........................................................................3-55
3.11.5 FUSING UNIT MOTOR ................................................................3-55
3.11.6 PAPER FEED CLUTCH 1 ............................................................3-56
3.11.7 PAPER FEED MOTOR.................................................................3-56
3.11.8 PAPER FEED CLUTCH 2 ............................................................3-57
3.11.9 REGISTRATION CLUTCH ...........................................................3-57
3.11.10 OIL PUMP ..................................................................................3-58
3.12 COPY ADJUSTMENT ...........................................................................3-59
3.12.1 PRINTING ....................................................................................3-59
Registration - Leading Edge/Side-to-Side...........................................3-59
Blank Margin.......................................................................................3-60
Main Scan Magnification.....................................................................3-60
3.12.2 SCANNING...................................................................................3-61
Scanner Sub-Scan Magnification........................................................3-61
Scanner Leading Edge and Side-to-Side Registration........................3-61
Main Scan Dot Position Correction .....................................................3-62
3.12.3 ARDF IMAGE ADJUSTMENT ......................................................3-63
ARDF Side-to-Side and Leading Edge Registration ...........................3-63
ARDF Skew Adjustment .....................................................................3-64
3.13 COLOR ADJUSTMENT.........................................................................3-65
3.13.1 AUTO COLOR CALIBRATION (ACC) ..........................................3-65
3.13.2 PRINTER GAMMA CORRECTION ..............................................3-66
Copy Mode .........................................................................................3-66
Printer Mode .......................................................................................3-70
3.14 SCANNER WHITE LEVEL ADJUSTMENT ...........................................3-72
White Level Check ..............................................................................3-72
White Level Adjustment ......................................................................3-72
3.15 TOUCH SCREEN CALIBRATION .........................................................3-75
3.16 CHECKING THE BREAKER SWITCH ..................................................3-76
3.16.1 BREAKER ....................................................................................3-76
4. TROUBLESHOOTING ................................................................ 4-1
4.1 SERVICE CALL.........................................................................................4-1
4.1.1 SERVICE CALL CONDITIONS ........................................................4-1
4.1.2 SC TABLE ........................................................................................4-3
4.2 SELF-DIAGNOSTIC MODE ....................................................................4-22
4.2.1 OVERVIEW ....................................................................................4-22
4.2.2 DETAILED SELF-DIAGNOSTICS ..................................................4-23
4.3 IMAGE TEST MODE ...............................................................................4-24
4.3.1 OVERVIEW ....................................................................................4-24
4.3.2 VPU TEST ......................................................................................4-24
SP4-907-1: VPU Test Pattern: R ........................................................4-24
SP4-907-2: VPU Test Pattern: G ........................................................4-24
SP4-907-3: VPU Test Pattern: B ........................................................4-24
4.3.3 IPU TEST .......................................................................................4-24
4.3.4 GAVD TEST ...................................................................................4-24
4.4 ELECTRICAL COMPONENT DEFECTS ................................................4-25
4.4.1 SENSORS ......................................................................................4-25
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