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Xerox 1235/DX Service Guide - Page 46

Print engine troubleshooting, Testing the print engine

UPC - 042215474542

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Print engine troubleshooting This topic is a step-by-step procedure for systematically verifying particular aspects of the printer's operation. Following this procedure should lead to the cause of a printer's failure. Testing the print engine 1. If the printer does not power up, or does not initialize, or the printer initializes but the motors do not run properly, go to the later topic, "Verifying power supply operation" on page 34. 2. Observe that the Ready message is displayed on the front panel. If it is not, go to the later topic "Verifying power supply operation" on page 34. 3. To ensure the print engine operates correctly, print one of its internal test pages as explained in the topic "Test printing" on page 71. If the printer prints a test print, then the printer's print engine is working correctly. Proceed with the next topic, "Verifying printer operation by using its self-test print" on page 34. If the printer does not make the test print, then a problem exists with the print engine. Proceed with the topic, "Verifying power supply operation" on page 34. Service Guide 33

Section	Page
Cover Page	1
_Contents1235.pdf	4
Figures	9
Tables	12
01_gen-info.pdf	14
The Phaser 1235 Color Printer	15
Printer RAM and printer capabilities	17
CRU life counter behavior	17
Print engine assemblies	18
The image processor board	24
The control panel	25
On Line LED	25
! Fault	25
Rear panel	26
Accessing special operating modes	27
System controller board LEDs	27
Paper tray type sensing	28
Specifications	29
Regulatory specifications	32
03_troubleshoot.pdf	44
Power on self-diagnostic test	45
Print engine troubleshooting	46
Testing the print engine	46
Verifying printer operation byusing its selftest print	47
Verifying power supply operation	47
Measuring power supply voltages	47
Inspecting the low-voltage power supply fuse	49
Safety interlocks	49
Testing for a shortedmotor	50
Motor and fuser roller resistances	51
Media jams and the paper path	52
Media-based problems	52
Media problems	52
Multiple-sheet pick	52
The media skews passing through the paper path	53
Paper tray indicates it is empty when it is not	53
Jams	54
Wrong media	54
Paper jams at the paper tray	54
Manual bypass feeder feed jams	55
Paper jams at the registration rollers	55
Paper jams at the transfer belt	55
Fuser jams	56
Eject jams	56
Jams in the duplex unit	56
No drum imaging unit installed	57
Imaging drum unit up/down error	57
Fan error	57
Fuser unit error	58
Other problems	59
The printer continuously displays “Booting” or “Initializing.”	59
False “No toner cartridge installed” message	59
False “No fuser unit installed” message	59
Front door indicated being open when it is closed	60
High temperature error	60
Low temperature error	60
Invalid memory DIMM	60
Light or blurred images	61
Dark, stained background	62
Blank print	63
Black stripe in direction of paper travel	64
White stripe in direction of paper travel	65
Poor fusing, toner offsetting	66
Repeating defect or voids on print	67
Missing characters or voids in print	68
Color misalignments	69
Unexpected colors	70
Image is skewed on the paper	71
Image is not centered on the print	71
The print is wrinkled	71
Macintosh printing problems	72
Image never prints	72
Image is rotated 90 degrees	72
Image prints in black-andwhite	72
Printer isn’t in the Chooser	73
Windows printing problems	73
Image never prints	73
04_adjust.pdf	74
Diagnostics mode	74
Switch scan test	76
Motor and clutch tests	82
Test printing	84
Consumable count initialization	86
Consumable counter display	88
Consumable continuation counter display	89
Adjusting color density and balance	90
Printing a Test Page	90
Interpreting the Color Balance test print	90
What to look for	91
Making adjustments	91
Adjustment recovery	92
05_clean.pdf	94
Service preventive maintenance procedure	94
Recommended tools	95
Periodically replaced parts	95
Cleaning	96
Cleaning the LED bar	96
Cleaning the pickup roller	96
06_nvram.pdf	98
07_disass.pdf	98
Cabinet panels	100
Top cover	100
Left-side cover	101
Right-side cover	102
Rear cover	103
Front cover	104
Face-up tray	105
Frames components	106
Right shield plate	106
Electrical chassis (card cage)	107
Electrical chassis cooling fan	109
Printer unit chassis (and low-voltage power supply fan)	110
Main cooling fan	112
Top cover inner frame	113
Left/right top cover spring assembly	116
Left paper tray guide assembly	117
Right paper tray guide assembly	119
Left plate assembly	121
Electronic boards	122
System controller board	122
Print engine controller board	123
Toner sensor board	124
Entrance sensor board	126
High voltage power supply	127
Low voltage power supply	129
Control panel	130
Paper feed components	131
Tray 1 feed roller and nudger roller	131
Retard pad	132
Paper-size sensing board	133
Paper-size sensing actuator	135
Main feeder assembly	136
Tray 1 no-paper/low-paper sensors	138
Paper tray lift arm roller	139
Multi-sheet bypass feeder components	140
Multi-sheet bypass feeder	140
Multi-sheet bypass feeder entrance sensor actuator	142
Paper transport components	143
Tray 1 entrance sensor actuator	143
Belt entrance sensor actuator	144
Transfer belt unit	145
Registration components	146
Registration clutch	146
Registration motor assembly	147
Registration roller assembly A and drive gear	148
Registration roller assembly B	150
Exit assembly and fuser components	152
Fuser latching handle (left)	153
Fuser latching handle (right)	154
Fuser exit roller	155
Exit sensor assembly	157
Duplex guide assembly	159
Eject guide assembly	161
Stack full sensor	162
Drive assembly components	164
Main motor assembly	164
Main feeder drive motor	166
Transfer belt motor assembly	167
Xerographic components	169
Shutter plate	169
Color registration sensor assembly	170
Color registration solenoid	171
LED assembly	172
Drum contact assembly	173
Toner sensor actuators	174
Duplex unit	176
Optional paper feeder components	177
Idler roller assembly	177
Inner frame	179
Feeder clutch	182
Feeder motor	184
Feeder control board	186
Paper transport roll guide	188
Feeder drive assembly	190
Paper size sensing board	193
Lower connector	194
Tray 2/3 feed roller and nudger roller	198
08_fru.pdf	200
Using the parts list	200
09_testprint.pdf	224