Ricoh G186 Service Manual page 14

3.7 DRIVE.......................................................................................................3-32
3.7.1 MAIN DRIVE UNIT ..........................................................................3-32
3.7.2 DEVELOPMENT DRIVE UNIT ........................................................3-33
3.8 OTHERS...................................................................................................3-36
3.8.1 MAIN PCB .......................................................................................3-36
3.8.2 CONNECTOR PCB .........................................................................3-37
3.8.3 SOLENOIDS ...................................................................................3-38
3.8.4 DUPLEX SOLENOID.......................................................................3-40
3.8.5 HOLDER PAD UNIT........................................................................3-41
3.8.6 TONER SENSOR PCB ...................................................................3-42
3.8.7 ENGINE PCB ..................................................................................3-44
3.8.8 DC FAN ...........................................................................................3-46
TROUBLESHOOTING
4. TROUBLESHOOTING ................................................................. 4-1
4.1 PROCEDURE OF CHECKING SYMPTOMS .............................................4-1
4.2 THE CAUSES AND SOLUTIONS OF BAD IMAGES .................................4-2
4.2.1 VERTICAL BLACK LINE AND BAND................................................4-2
4.2.2 VERTICAL WHITE LINE ...................................................................4-2
4.2.3 HORIZONTAL BLACK BAND............................................................4-3
4.2.4 BLACK/WHITE SPOT .......................................................................4-4
4.2.5 LIGHT IMAGE ...................................................................................4-5
4.2.6 DARK IMAGE OR BLACK PAGE ......................................................4-6
4.2.7 UNEVEN DENSITY ...........................................................................4-7
4.2.8 BACKGROUND.................................................................................4-7
4.2.9 GHOST (1) ........................................................................................4-8
4.2.10 GHOST (2)...................................................................................4-9
4.2.11 GHOST (3): FUSER...................................................................4-10
4.2.12 STAINS ON THE FACE OF PAGE ............................................4-10
4.2.13 STAINS ON THE BACK OF PAGE............................................4-11
4.2.14 BLANK PAGE PRINT OUT (1)...................................................4-12
4.2.15 BLANK PAGE PRINT OUT (2)...................................................4-12
4.3 THE CAUSES AND SOLUTIONS OF BAD DISCHARGE ........................4-14
4.3.1 WRONG PRINT POSITION ............................................................4-14
4.3.2 JAM 0 ..............................................................................................4-14
4.3.3 JAM 1 ..............................................................................................4-15
4.3.4 JAM 2 ..............................................................................................4-16
4.3.5 DUPLEX JAM 1 ...............................................................................4-17
4.3.6 DUPLEX JAM 0 ...............................................................................4-18
4.3.7 MULTI-FEEDING.............................................................................4-18
4.3.8 PAPER ROLLED IN THE FUSER ...................................................4-19
4.3.9 PAPER ROLLED ON THE OPC DRUM ..........................................4-19
4.4 MALFUNCTION CAUSES AND SOLUTIONS..........................................4-21
4.4.1 FUSER ERROR ..............................................................................4-21
4.4.2 LSU (LASER SCANNING UNIT) ERROR .......................................4-21
4.4.3 MALFUNCTION OF THE GEAR OF THE FUSER DUE TO MELTING4-22
4.4.4 PAPER EMPTY ...............................................................................4-22
G186 ii SM