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Lexmark C750 Manual

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5060-00x 13. Turn each thumbwheel the appropriate number of clicks as indicated by the test page. 14. 15. For example, if the test page indicates a +10 as the misalignment, turn the thumbwheel 10 clicks in the positive direction indicated on the test page. Do this for both the front and rear. • Bias the printhead against both thumbwheels, and hold in place when tightening the printhead mounting screws. • Tighten the right rear printhead mounting screw. Then tighten the front screw followed by the left rear screw. Send the file PHALIGN6.FLS (Printhead Mechanical Alignment Test Page) from the CD to the printer to verify printhead alignment. If the printhead alignment is within ±5 for both front and rear positions, then proceed to electronic adjustment procedure. If not, repeat steps 12 through 15, until alignment is within ±5. If you are replacing the black printhead, make sure on the test page that black is within ±5 and also within ±1 between the front and rear side. For example, if the rear looks like it is at +3, then the front should be between +2 and +4. Note: When replacing the black printhead there is no Z value to reset. After the black printhead is mechanically aligned to the magenta printhead, it will be necessary to electronically align the three color printheads to the new black printhead. Printer registration (only for black printhead replacement) To perform the registration and alignment through the Diagnostics Menu: 1. Enter Diagnostics Mode. a. Turn the printer off. b. Press and hold Go and Return. c. Turn the printer on. d. Release the buttons when Performing Self Test displays. 2. Select Registration from the menu. Four margin offset settings are displayed. T= sxx L= sxx B=sxx R=sxx Where xx is the current value and s is the sign (+ or -) 3. Press Go to print the Quick Test Page. A-10 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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A-10

Service Manual

5060-00

13.

Turn each thumbwheel the appropriate number of

clicks

as indicated by the test page.

For example, if the test page indicates a +10 as the misalignment, turn the thumbwheel 10

clicks

in the

positive direction indicated on the test page. Do this for both the front and rear.

•

Bias the printhead against both thumbwheels, and hold in place when tightening the printhead

mounting screws.

•

Tighten the right rear printhead mounting screw. Then tighten the front screw followed by the left rear

screw.

14.

Send the file PHALIGN6.FLS (Printhead Mechanical Alignment Test Page) from the CD to the printer to

verify printhead alignment.

15.

If the printhead alignment is within ±5 for both front and rear positions, then proceed to electronic

adjustment procedure. If not, repeat steps 12 through 15, until alignment is within ±5.

If you are replacing the black printhead, make sure on the test page that black is within ±5 and also within

±1 between the front and rear side. For example, if the rear looks like it is at +3, then the front should be

between +2 and +4.

Note:

When replacing the black printhead there is no Z value to reset. After the black printhead is

mechanically aligned to the magenta printhead, it will be necessary to electronically align the three color

printheads to the new black printhead.

Printer registration (only for black printhead replacement)

To perform the registration and alignment through the Diagnostics Menu:

Enter Diagnostics Mode.

Turn the printer off.

Press and hold

and

Return

Turn the printer on.

Release the buttons when

Performing Self Test

displays.

Select

Registration

from the menu.

Four margin offset settings are displayed.

Where

is the current value and

is the sign (+ or -)

Press

to print the Quick Test Page.

sxx