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Lexmark C750 Service Manual - Page 189

Lexmark C750 Manual

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5060-00x Print quality For a transparency of the defect locator chart, go to the back of the hard copy service manual. Note: If you want to copy the chart, then the following should be observed. Since fax machines, digital scanners, and xerographic copiers can distort images, charts should be printed using the transparent copy provided in the service manual. In order to maintain the accuracy of the edge rulers, the following steps should be heeded when printing a copy of the Defect Location Chart. 1. When printing this document, make sure "Fit the page" is NOT selected. 2. Measure the distance between the reference line and the 110 mm calibration mark to verify that it is correct. If the distance is inaccurate, the bottom registration margin setting can be adjusted to correct the discrepancy. Increasing the bottom margin value stretches the image, reducing the bottom margin value shrinks the image. Original margin settings should be noted in case these changes adversely effect the print quality or registration when printing normal documents. Partial Print Test This procedure is also available in color. See "Partial Print Test" on page A-16. Diagnostic procedure for missing or faded planes 1. 2. 3. 4. 5. 6. 7. Turn the printer off. Remove all cartridges and the ITU. Inspect the bellcranks. Enter the Configuration Menu. See "Entering CONFIG MENU" on page 3-7. Select Prt Quality Pgs and press Select. Open the vacuum transport belt (VTB) jam access door and watch the test pages pass from left to right over the VTB. There is a delay between the first and second page. Once the pages are printed, examine the pages for to confirm the color plane is not printing. Note: The third page is particularly important since it is the image on the belt when the test printed. Open the VTB through the access door and, once again, watch the test pages pass over the VTB. 8. Select Prt Quality Pgs and press Select. 9. When the top half of the second page passes over the VTB, quickly open the front cover. The printing stops. Approximate final stopping place Diagnostic aids 3-5

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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Match case Limit results 1 per page

Diagnostic aids

3-5

5060-00

Print quality

For a transparency of the defect locator chart, go to the back of the hard copy service manual.

Note:

If you want to copy the chart, then the following should be observed.

Since fax machines, digital scanners, and xerographic copiers can distort images, charts should be printed using

the transparent copy provided in the service manual. In order to maintain the accuracy of the edge rulers, the

following steps should be heeded when printing a copy of the Defect Location Chart.

When printing this document, make sure “Fit the page” is NOT selected.

Measure the distance between the reference line and the 110 mm calibration mark to verify that it is

correct. If the distance is inaccurate, the bottom registration margin setting can be adjusted to correct the

discrepancy. Increasing the bottom margin value stretches the image, reducing the bottom margin value

shrinks the image. Original margin settings should be noted in case these changes adversely effect the

print quality or registration when printing normal documents.

Partial Print Test

This procedure is also available in color. See

“Partial Print Test” on page A-16

Diagnostic procedure for missing or faded planes

Turn the printer off.

Remove all cartridges and the ITU.

Inspect the bellcranks.

Enter the Configuration Menu. See

“Entering CONFIG MENU” on page 3-7

Select

Prt Quality Pgs

and press

Select

Open the vacuum transport belt (VTB) jam access door and watch the test pages pass from left to right

over the VTB.

There is a delay between the first and second page.

Once the pages are printed, examine the pages for to confirm the color plane is not printing.

Note:

The third page is particularly important since it is the image on the belt when the test printed.

Select

Prt Quality Pgs

and press

Select

Open the VTB through the access door and, once again, watch the test pages pass over the VTB.

When the top half of the second page passes over the VTB, quickly open the front cover. The printing

stops.

Approximate

final stopping

place