Ricoh BP20 Service Manual page 14

3.11 BYPASS TRAY UNIT AND FEED ROLLER ..........................................3-30
3.11.1 BYPASS TRAY UNIT ...................................................................3-30
3.12 PICK-UP ASSEMBLY AND SOLENOID................................................3-32
Pick-up Roller and By-pass Pick-up Roller .........................................3-34
Paper Feed Unit Pick-up Roller ..........................................................3-34
By-pass pick-up roller .........................................................................3-35
TROUBLESHOOTING
4. TROUBLESHOOTING ................................................................. 4-1
4.1 PAPER PATH............................................................................................4-1
4.1.1 PAPER JAM CONDITIONS..............................................................4-2
Jam0 .....................................................................................................4-2
Jam1 .....................................................................................................4-2
Jam2 .....................................................................................................4-3
4.2 CLEARING PAPER JAMS ........................................................................4-4
4.2.1 JAM2 (PAPER EXIT AREA) .............................................................4-4
4.2.2 JAM0 (PAPER FEED AREA)............................................................4-6
4.2.3 JAM1 (TONER CARTRIDGE AREA)................................................4-7
4.2.4 TIPS TO AVOID PAPER JAMS........................................................4-8
4.3 SAMPLE PATTERN ..................................................................................4-9
4.3.1 PRINTING A DEMO PAGE AND CONFIGURATION PAGE ............4-9
4.3.2 PRINTING A CLEANING SHEET ...................................................4-10
4.4 OPERATION PANEL DISPLAY...............................................................4-10
4.5 PERIODIC DEFECTIVE IMAGE..............................................................4-10
4.6 PRINTOUT PROBLEMS .........................................................................4-11
4.6.1 INCORRECT PRINT POSITION ....................................................4-11
4.6.2 VERTICAL BLACK LINE AND BAND .............................................4-11
4.6.3 VERTICAL WHITE LINE.................................................................4-11
4.6.4 HORIZONTAL BLACK BANDS ......................................................4-12
4.6.5 BLACK/WHITE SPOTS ..................................................................4-12
4.6.6 LIGHT IMAGE ................................................................................4-12
4.6.7 DARK/BLACK IMAGE ....................................................................4-13
4.6.8 UNEVEN DENSITY ........................................................................4-13
4.6.9 BACKGROUND ..............................................................................4-13
4.6.10 GHOST 1......................................................................................4-14
4.6.11 GHOST 2......................................................................................4-14
4.6.12 GHOST 3......................................................................................4-14
4.6.13 GHOST 4......................................................................................4-15
4.6.14 STAINS ON FRONT OF PAGE ....................................................4-15
4.6.15 STAINS ON BACK OF PAGE.......................................................4-15
4.6.16 BLANK PAGE 1 ............................................................................4-15
4.6.17 BLANK PAGE 2 ............................................................................4-16
4.7 PAPER FEED PROBLEMS .....................................................................4-17
4.7.1 INCORRECT PRINT POSITION ....................................................4-17
4.7.2 JAM 0 .............................................................................................4-17
4.7.3 JAM 1 .............................................................................................4-17
4.7.4 JAM 2 .............................................................................................4-18
G144/G145 ii SM