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Lexmark C750 Service Manual - Page 150

Lexmark C750 Manual

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5060-00x Step D Step 1 Action and questions Enter the Diagnostics Mode and select the Tray 1 Sensor Test from the Input Tray Tests menu. You can activate the paper level sensor inside the printer. The paper level sensor is a dual sensor and checks the following levels for tray 1. The tray 1 level sensor is a dual sensor assembly that senses when tray 1 is empty, nearly empty, or partially empty. Does the sensor test pass? 2 Paper level sensing assembly-make sure the assembly is not loose or damaged. Make sure the arm is not broken. Are any parts loose or broken? 3 Check the paper level sensing cable for correct installation at J69 on the engine board and to the paper level sensing dual sensor assembly. Is the cable connected correctly? 4 Check the paper level sensing assembly flag for correct installation and the flag is not broken or damaged. Is the paper level sensing assembly installed correctly and the flag not broken or damaged? 5 Check continuity of the paper level sensing cable. Is there continuity? 6 Check the voltage at J69-1. It should measure approximately +5 V dc. Is the voltage correct? Replace the level sensing assembly. Go to step 6 Go to step 5 Install correctly or replace the flag if damaged or broken Go to step 4 Install the cable correctly Repair or replace parts as necessary. Go to step 3 Yes Call your next level support. No Go to step 2 Replace the level sensing cable Replace the engine board. See "Engine board removal" on page 4-29. Step E Step 1 Action and questions Check the make sure that the transparency material installed in Tray 1 meets machine requirements. Does the media meet requirements? 2 Check the following for correct installation and signs of broken or damaged parts: • Transparency lift arm • Transparency lift link Is the transparency sensor assembly installed correctly, not damaged or broken? Go to step 3 Replace the autocompensator. See "Autocompensat or pick assembly removal" on page 4-17. Yes Go to step 2 No Inform the customer 2-116 Service Manual

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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