Lexmark C750 Service Manual - Page 184

2-150

Service Manual

5060-00

x

Tray 1 paper size sensing service check

The printer does not sense the size of the media installed in tray 1.

Note:

If there is a problem when installing tray 1, tray 1 is difficult to remove or does not stay locked in position,

go to

“Tray 1 service check” on page 2-149

.

Step

Action and questions

Yes

No

1

Make sure tray 1 is installed and seated correctly in the

printer.

Is the tray correctly installed?

Go to step 2

Install Tray 1

correctly. If there is

still a problem, go

to

“Tray 1 service

check” on

page 2-149

.

2

Is another 500-sheet tray available?

Go to step 3

Go to step 4

3

Try another 500-sheet tray in place of the internal tray 1

paper tray.

Does this fix the problem?

Go to step 4

Go to step 7

4

Check tray 1 for broken parts, especially the teeth on

the back restraint.

Is the back restraint broken or any of the teeth broken

or missing?

Replace the Back

Restraint

Go to step 5

5

Check the following parts to make sure they are

installed correctly and they are not damaged or broken.

•

Size sensing gear cover

•

Size sensing gear

•

Size sensing barrel cam

Note

: Make sure the size sensing barrel cam is

correctly installed. Observe the position of the cam tab

through the size sensing gear cover. Observe the cam

position through the cover by moving the back restraint

and observe the cam detent. In the A5 media position

the detent should be visible through the opening in the

gear cover.

Are all the parts installed correctly, and not broken or

missing?

Go to step 6

Replace tray 1.

6

Make sure the following parts in the printer are

operating correctly. Check for any signs of broken or

missing parts.

•

Size sensing springs

•

Size sensing links

•

Size sensing bracket

Are there broken or missing parts?

Repair or replace

parts as necessary

Go to step 7

7

Check paper size sensing assembly to make sure that

the size sensing links correctly actuate the paper size

switches on the engine board.

Does tray 1 correctly actuate the paper size switches

on the engine board?

Replace the engine

board. See

“Engine board

removal” on

page 4-29

Repair or replace

parts as necessary

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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Lexmark C750 Service Manual - Page 184

Lexmark C750 Manual

Page 184 highlights