ii
4. TROUBLESHOOTING................................................................. 4-1
4.1 TOOLS FOR TROUBLESHOOTING ........................................................ 4-1
4.2 DIAGNOSTICS ......................................................................................... 4-2
4.2.1 ERROR MESSAGES....................................................................... 4-2
4.3 PRINT QUALITY....................................................................................... 4-3
4.4 NOTE FOR REPLACING MAIN BOARD .................................................. 4-4
4.5 TROUBLESHOOTING FLOW CHART ..................................................... 4-5
4.5.1 VERTICAL BLACK LINE BAND....................................................... 4-5
4.5.2 NO IMAGE ....................................................................................... 4-6
4.5.3 LIGHT IMAGE.................................................................................. 4-8
4.5.4 ALL BLACK...................................................................................... 4-9
4.5.5 VERTICAL WHITE LINE (BAND)................................................... 4-10
4.5.6 DARK IMAGE ................................................................................ 4-11
4.5.7 DIRTY BACKGROUND ................................................................. 4-12
4.5.8 GHOST .......................................................................................... 4-13
4.5.9 BLACK SPOT ................................................................................ 4-14
4.5.10 HORIZONTAL BAND................................................................... 4-15
4.5.11 TONER CONTAMINATIONS BACK OF PAPER ......................... 4-16
4.5.12 PARTIAL BLANK IMAGE (NOT PERIODIC)................................ 4-16
4.5.13 PARTIAL BLANK IMAGE (PERIODIC) ........................................ 4-17
4.5.14 IRREGULAR DENSITY................................................................ 4-18
4.5.15 WHITE SPOT............................................................................... 4-18
4.5.16 TREMBLING AT THE END WHEN OHP PRINTING ................... 4-19
4.5.17 POOR FUSING GRADE .............................................................. 4-19
4.5.18 NO POWER (LCD NO DISPLAY LED OFF) ................................ 4-20
4.5.19 FUSING UNIT ERROR ................................................................ 4-21
4.5.20 PAPER JAM (MISFEEDING) ....................................................... 4-22
4.5.21 PAPER JAM (JAM1) .................................................................... 4-23
4.5.22 LSU ERROR ................................................................................ 4-24
5. SERVICE MODE ......................................................................... 5-1
5.1 TECH MODE ............................................................................................ 5-1
5.1.1 ACCESSING TECH MODE ............................................................ 5-1
To Access TECH Mode........................................................................ 5-1
To Return to the Normal User Mode .................................................... 5-1
5.1.2 SYSTEM DATA LIST IN TECH MODE ............................................ 5-2
5.1.3 TECH MODE OPTIONS .................................................................. 5-3
MODEM SPEED
.................................................................................. 5-3
DIALING MODE
................................................................................... 5-3
SEND FAX LEVEL
............................................................................... 5-3
PAUSE TIME
....................................................................................... 5-3
REDIAL INTERVAL
.............................................................................. 5-3
REDIAL COUNT
.................................................................................. 5-4
DP MAKE/BREAK
................................................................................ 5-4
SILENCE TIME
.................................................................................... 5-4
ERROR RATE
...................................................................................... 5-4
IGNORE TONER EMPTY
.................................................................... 5-4
