Ricoh G157 Service Manual page 15

After replacement ...............................................................................3-34
3.13.3 NCU (NETWORK CONTROL UNIT) ............................................3-36
3.13.4 NCU BATTERY ............................................................................3-36
3.13.5 POWER SUPPLY UNIT (DIRECT CURRENT).............................3-37
3.13.6 HIGH VOLTAGE UNIT .................................................................3-38
3.14 DRIVE PATH .........................................................................................3-39
3.14.1 MAIN MOTOR DRIVE PATH ........................................................3-39
3.14.2 DEVELOPMENT MOTOR DRIVE PATH......................................3-41
3.15 EXHAUST FAN .....................................................................................3-42
3.15.1 OPTICS UNIT FAN.......................................................................3-42
3.15.2 PSU FAN ......................................................................................3-42
3.15.3 SPEAKER.....................................................................................3-43
3.15.4 FUSING FAN ................................................................................3-43
3.16 INTERLOCK SWITCH ...........................................................................3-44
3.16.1 FRONT COVER SWITCH ............................................................3-44
3.16.2 TOP AND REAR COVER SWITCHES .........................................3-44
3.17 REGISTRATION....................................................................................3-45
3.17.1 LEADING EDGE REGISTRATION ...............................................3-45
3.17.2 SIDE-TO-SIDE REGISTRATION..................................................3-45
TROUBLESHOOTING
4. TROUBLESHOOTING ................................................................. 4-1
4.1 ERROR INDICATION................................................................................4-1
4.1.1 EQUIPMENT ERRORS ....................................................................4-1
Error messages appearing on the LCD.................................................4-1
MACHINE ERRORxx (xx indicates the error code number) .................4-4
Copier Errors ......................................................................................4-10
4.1.2 COMMUNICATION ERRORS ........................................................4-15
Definition of error codes on the communications list...........................4-15
4.2 PAPER TRANSPORT ERRORS .............................................................4-19
4.2.1 OVERVIEW ....................................................................................4-19
4.2.2 JAM RECOVERY PROCEDURES .................................................4-20
Feed Jam............................................................................................4-20
Inner Jam............................................................................................4-20
4.3 SOFTWARE PROBLEMS .......................................................................4-21
4.4 IMAGE QUALITY.....................................................................................4-23
4.4.1 BACKGROUND ..............................................................................4-23
Symptom.............................................................................................4-23
Possible Cause ...................................................................................4-23
Countermeasures ...............................................................................4-23
4.4.2 MISSING IMAGE AT EDGE ...........................................................4-23
Symptom.............................................................................................4-23
Possible Cause ...................................................................................4-23
Countermeasures ...............................................................................4-23
4.4.3 JITTER ...........................................................................................4-24
Symptom.............................................................................................4-24
Possible Cause ...................................................................................4-24
SM iii G157