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Lexmark X7500 Service Manual - Page 50

Image unclear, Large jitter

UPC - 734646391306

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4036-501 Image unclear Cause Lamp too dark Dirt on calibration reference Dirt on the mirrors Dirt on the lens Relevant unit Lamp Flatbed platen glass Mirrors Lens Check method Visual check. Visual check of white calibration strip on underside of flatbed glass. Visual check. Visual check. Maintenance method Replace lamp. Clean the flatbed platen glass with isopropyl alcohol. Clean the mirrors with isopropyl alcohol. Clean the lens with isopropyl alcohol. Large jitter Cause Relevant unit Main drive motor assembly connection failure Main drive motor failure Dynamic motor damper failure None Main drive motor Dynamic motor damper Check method Visual check. Visual check. Visual check. Maintenance method Connect the connector. Replace the motor. Replace the dynamic damper. 2-10 Service Manual

Section	Page
Table of Contents	2
Notices and Safety Information	6
Preface	10
1. General Information	11
Maintenance Approach	11
Tools Required for Service	11
Acronyms	12
Preparing the scanner for shipping	13
Duplex Auto Document Feeder (DADF) Power Principles of Operation	14
DADF Control	14
DADF Control Components	16
Mechanical Drive	18
DADF Mechanical Drive Components	19
DADF Paper Path	20
Operational Pattern 1	22
Operational Pattern 2	28
DADF Paper Path Components	32
Scanner Principles of Operation	33
Scanner Power	33
Scanner Control	34
Scanner Control Components	36
Mechanical Drive	38
Mechanical Drive Components	39
Scanning Methods	40
2. Diagnostic Information	41
Start	41
Scanner Errors	42
MFD Controller Cage Errors	44
Symptom Tables	47
Power does not come on.	47
Strange sound generated (DADF)	48
Frequent paper jam, double feed or skew	49
Image unclear	50
Large jitter	50
Image does not appear	51
3. Diagnostic Aids	53
4. DADF Repair Procedures	55
Preparation	55
Notations in the Removal Replacement text	56
Adjustments	57
DADF Assembly Height Adjustment	57
DADF Assembly Paper Skew Adjustment	58
Adjusting the Position of Full Rate/Half Rate Carriages	60
Configuring the MFD Controller Card	62
DADF Repair Procedures	63
DADF Assembly Removal	63
DADF Front Cover, Handle, and Magnet Removal	65
DADF Cushion Removal	66
DADF Exit/Reverse Solenoid Removal	68
DADF Input Tray Assembly Removal	69
DADF Jam Access Door Assembly Removal	70
DADF Top Cover Removal	72
DADF Rear Cover Removal	73
DADF Jam Door Open Switch Removal	74
Mylar Paper Guide Strip Removal	75
DADF Left and Right Hinge Removals	76
DADF Controller Card Assembly Removal	78
DADF Registration Roll Drive Motor Assembly Removal	80
DADF Main Drive Motor Assembly Removal	82
DADF Separator Pad Assembly Removal	84
DADF Separator Pad Removal	85
DADF #1 and #2 Linkage Removals	86
Linkage Cover Removal	87
Paper Stop Spring and Paper Stop Removal	88
DADF Roller Engagement Shaft Assembly Removal	90
DADF Paper Present Sensor Removal	92
DADF Paper Present Indicator Card Assembly Removal	93
Paper Present Sensor Flag Removal	94
DADF Pick Roller with Separator Pad Kit Assembly Removal	95
Registration Sensor Removal	96
DADF Gear #3 Bearing Removal	97
Tension Roller Spring and Tension Roller Removal	98
DADF Upper Paper Guide Removal	99
DADF #4 Gear Removal	100
Scanner Repair Procedures	102
User Interface Panel Removal	103
Flatbed Scanner Top Cover Assembly Removal	104
Flatbed Center Platen Glass Plate Removal	106
Left DADF Platen Glass Plate Removal	108
Scanner Main Drive Motor Assembly Removal	109
Scanner Motor Card Assembly Removal	110
Flatbed Open Sensor Removal	111
Registration Sensor Assembly Removal	112
Plate Switch Assembly Removal	113
Scanner System Card Assembly Removal	114
Charge Couple Device Card Assembly Removal	116
Automatic Paper Size Sensor Removal	118
Full Rate Carriage Lamp Assembly Removal	119
Cable Assembly-Scan, Rear Removal	120
Full Rate Carriage Lamp Cable Removal	125
5. Connector Locations	127
Location Maps	128
Wiring Diagrams and Signal Information	134
DADF Master Wiring Diagram	135
DADF Controller Card Assembly ´ DADF Document In Sensor ´ PWBA Size ´ DADF LED PWD	136
DADF Controller Card Assembly ´ DADF Jam Cover Open Switch	137
DADF Controller Card Assembly ´ DADF Pick Up Sensor PWD	138
DADF Controller Card Assembly´PWBA Tray Sensor	138
DADF Controller Card Assembly ´ Stamp Solenoid	139
DADF Controller Card Assembly ´ DADF Reverse Sensor	140
DADF Controller Card Assembly ´ DADF Exit/Reverse Solenoid	142
Scanner Master Wiring Diagram	143
Scanner System Card IPS LX ´ CCD PWBA ´ CCD SNR	144
Scanner System Card LX ´ Lamp Invertor Power Supply	145
Scanner System Card IPS ´ Size Detect	146
Scanner System Card IPS ´ Scan Drive ´ IIT Motor	147
Scanner System Card IPS ´ Control Panel (LCD)	148
Scanner System Card IPS ´ Flash ROM (1/2)	150
Scanner System Card IPS ´ Flash ROM (2/2)	152
Scanner System Card IPS ´ DADF	154
Scanner System Card IPS ´ MFD (1/4)	156
Scanner System Card IPS ´ MFD (2/4)	159
Scanner System Card IPS ´ MFD (3/4)	160
Scanner System Card IPS ´ MFD (4/4)	161
External Low Voltage Power Supply	162
6. Preventive Maintenance	163
Maintaining Your Multifunction Product (MFP)	163
CleaNing the touchscreen	163
Cleaning the scannerbed	163
Cleaning the scanner rollers	163
Cleaning the scanner pick pads	165
7. Parts Catalog	167
How to Use This Parts Catalog	167
Assembly 1: DADF Cover and Solenoid	168
Assembly 2: DADF Cover, Switch, and Hinge (Rear)	170
Assembly 3: DADF Control Board and DADF Registration Roll Drive Motor Assembly	172
Assembly 4: DADF Separator Pad Asm. and Paper Stop	174
Assembly 5: DADF Pick Roller	176
Assembly 6: DADF Document Registration	178
Assembly 7: DADF Wiring Harness	180
Assembly 8: Scanner Platen Glass and IPS PWB	182
Assembly 9: Scanner Lens Assembly and CCD Card	184
Assembly 10: Scanner Carriage Motor and Cable	186
Assembly 11: Scanner Full Rate and Half Rate Carriage	188
Assembly 12: Scanner Top Cover	190
Assembly 13: Multifunction Device Controller Cage Electronics	192
Index	195
A	195
C	195
M	195
O	195
P	195
R	195
S	195
T	196
W	196