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Lexmark C750 Service Manual - Page 427

Lexmark C750 Manual

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5060-00x Appendix A-Service tips Printhead diagnostics If you get a printhead error, follow this diagnostic to find the specific failure. 1. Verify that all the printhead cables are properly seated. 2. If the printhead cables are properly seated and the error remains, record the error code. Continue to the next step. Determine how to setup the printhead diagnostic tool. a. If the printhead diagnostic tool is not configured as in the illustration below, reconfigure it to match. Y/M Motor Y/M Video C/K Motor C/K Video b. Select which pair of printheads to switch based on the error code. If the printer displays the codes that indicate yellow or cyan, use the tool to switch the yellow and cyan signals. If the error code indicates a magenta or black error, use the tool to switch the magenta and black signals. Connect tool here for yellow/cyan Connect tool here for magenta/black Appendix A-Service tips A-1

Section	Page
Table of contents	3
Notices and safety information	11
Laser notice	11
Safety information	17
Preface	20
Definitions	20
1. General information	21
Tools required for service	21
Options and features	22
High performance	22
Print quality	22
Heavy volume reliability	22
Automatic calibration	22
Resolution	23
Toner darkness	23
Printer specifications	23
Dimensions	23
Power and electrical specifications	23
Electrical specifications	24
Operating clearances	24
Fuser web oiler upgrade kit and replacements	24
Upgrade kit	24
Replacements	24
Acoustics	25
Environment	25
Print speed and performance print speed	26
Performance	26
Time to first print	26
Processor	26
Duty cycle	26
Memory configuration	27
Available memory options	27
Media specifications	27
Acronyms	33
2. Diagnostic information	35
Start	35
POR (power-on reset) sequence	36
Symptom tables	37
Symptom table-base printer	37
Symptom table-500-sheet drawer option	38
Symptom table-HCIT 2000-sheet option	38
Symptom table-output expander option	39
Symptom table-5-bin mailbox option	39
Symptom table-finisher option	39
Error code table	40
Sub error code table	51
Programming errors - P101 through P116	54
Understanding the printer operator panel	54
Operator panel buttons	54
Color Menu	56
Utilities Menu	57
User attendance message table	62
Service checks	76
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