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Xerox 1235N Service Guide - Page 50

Inspecting the low-voltage power supply fuse, Safety interlocks, When the front cover door is

UPC - 042215474580

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Inspecting the low-voltage power supply fuse The 115 VAC power supply features a 20 A fuse. The 220 VAC power supply fuse uses a 10 A fuse. 1. Turn off the printer. 2. Disconnect the power cord from the printer. 3. Remove the left-side cover as described in "Left-side cover" on page 88. 4. Remove the main cooling fan as described in "Main cooling fan" on page 99. The fuse is now accessible. If the fuse is good, but the printer's power supply does not output DC voltages, replace the low-voltage power supply. Safety interlocks The printer features two safety interlock switches: s Top door-opened switch. s Front door-opened switch. When the top cover switch is opened, the +32 VDC supply to the motors is shut down, as well as the high-voltage power supply. When the front cover door is opened, the +32 VDC supply to the duplex unit and high-voltage power supply is disabled. 5. Turn off the printer. 6. With a DMM set to measure resistance, test each switch when it is opened and closed. 7. Inspect each switch's wiring harness for pinches, nicks or open connections. If you ﬁnd a switch that is defective, replace it. If no motors appear to be at fault, replace the engine controller board. 36 Phaser 1235 Network Color Printer

Section	Page
_Contents1235.pdf	10
Tables	13
01_gen-info.pdf	15
The Phaser 1235 Color Printer	16
Printer RAM and printer capabilities	18
CRU life counter behavior	18
Print engine assemblies	19
The image processor board	25
The control panel	26
On Line LED	26
! Fault	26
Rear panel	27
Accessing special operating modes	28
System controller board LEDs	28
Paper tray type sensing	29
Specifications	30
Regulatory specifications	33
03_troubleshoot.pdf	45
Power on self-diagnostic test	46
Print engine troubleshooting	47
Testing the print engine	47
Verifying printer operation byusing its selftest print	48
Verifying power supply operation	48
Measuring power supply voltages	48
Inspecting the low-voltage power supply fuse	50
Safety interlocks	50
Testing for a shortedmotor	51
Motor and fuser roller resistances	52
Media jams and the paper path	53
Media-based problems	53
Media problems	53
Multiple-sheet pick	53
The media skews passing through the paper path	54
Paper tray indicates it is empty when it is not	54
Jams	55
Wrong media	55
Paper jams at the paper tray	55
Manual bypass feeder feed jams	56
Paper jams at the registration rollers	56
Paper jams at the transfer belt	56
Fuser jams	57
Eject jams	57
Jams in the duplex unit	57
No drum imaging unit installed	58
Imaging drum unit up/down error	58
Fan error	58
Fuser unit error	59
Other problems	60
The printer continuously displays “Booting” or “Initializing.”	60
False “No toner cartridge installed” message	60
False “No fuser unit installed” message	60
Front door indicated being open when it is closed	61
High temperature error	61
Low temperature error	61
Invalid memory DIMM	61
Light or blurred images	62
Dark, stained background	63
Blank print	64
Black stripe in direction of paper travel	65
White stripe in direction of paper travel	66
Poor fusing, toner offsetting	67
Repeating defect or voids on print	68
Missing characters or voids in print	69
Color misalignments	70
Unexpected colors	71
Image is skewed on the paper	72
Image is not centered on the print	72
The print is wrinkled	72
Macintosh printing problems	73
Image never prints	73
Image is rotated 90 degrees	73
Image prints in black-andwhite	73
Printer isn’t in the Chooser	74
Windows printing problems	74
Image never prints	74
04_adjust.pdf	75
Diagnostics mode	75
Switch scan test	77
Motor and clutch tests	83
Test printing	85
Consumable count initialization	87
Consumable counter display	89
Consumable continuation counter display	90
Adjusting color density and balance	91
Printing a Test Page	91
Interpreting the Color Balance test print	91
What to look for	92
Making adjustments	92
Adjustment recovery	93
05_clean.pdf	95
Service preventive maintenance procedure	95
Recommended tools	96
Periodically replaced parts	96
Cleaning	97
Cleaning the LED bar	97
Cleaning the pickup roller	97
06_nvram.pdf	99
07_disass.pdf	99
Cabinet panels	101
Top cover	101
Left-side cover	102
Right-side cover	103
Rear cover	104
Front cover	105
Face-up tray	106
Frames components	107
Right shield plate	107
Electrical chassis (card cage)	108
Electrical chassis cooling fan	110
Printer unit chassis (and low-voltage power supply fan)	111
Main cooling fan	113
Top cover inner frame	114
Left/right top cover spring assembly	117
Left paper tray guide assembly	118
Right paper tray guide assembly	120
Left plate assembly	122
Electronic boards	123
System controller board	123
Print engine controller board	124
Toner sensor board	125
Entrance sensor board	127
High voltage power supply	128
Low voltage power supply	130
Control panel	131
Paper feed components	132
Tray 1 feed roller and nudger roller	132
Retard pad	133
Paper-size sensing board	134
Paper-size sensing actuator	136
Main feeder assembly	137
Tray 1 no-paper/low-paper sensors	139
Paper tray lift arm roller	140
Multi-sheet bypass feeder components	141
Multi-sheet bypass feeder	141
Multi-sheet bypass feeder entrance sensor actuator	143
Paper transport components	144
Tray 1 entrance sensor actuator	144
Belt entrance sensor actuator	145
Transfer belt unit	146
Registration components	147
Registration clutch	147
Registration motor assembly	148
Registration roller assembly A and drive gear	149
Registration roller assembly B	151
Exit assembly and fuser components	153
Fuser latching handle (left)	154
Fuser latching handle (right)	155
Fuser exit roller	156
Exit sensor assembly	158
Duplex guide assembly	160
Eject guide assembly	162
Stack full sensor	163
Drive assembly components	165
Main motor assembly	165
Main feeder drive motor	167
Transfer belt motor assembly	168
Xerographic components	170
Shutter plate	170
Color registration sensor assembly	171
Color registration solenoid	172
LED assembly	173
Drum contact assembly	174
Toner sensor actuators	175
Duplex unit	177
Optional paper feeder components	178
Idler roller assembly	178
Inner frame	180
Feeder clutch	183
Feeder motor	185
Feeder control board	187
Paper transport roll guide	189
Feeder drive assembly	191
Paper size sensing board	194
Lower connector	195
Tray 2/3 feed roller and nudger roller	199
08_fru.pdf	201
Using the parts list	201
09_testprint.pdf	225