Lexmark C750 Service Manual - Page 152

2-118

Service Manual

5060-00

x

Close door/HVPS/printhead interlock switch service check

Note:

There are two separate cables that contain two microswitches and a cable. These cable/switches provide

separate interlocks for the printhead and HVPS. One switch in each cable is mounted in the front access door

support and the other switch in each cable is mounted on the ITU light shield assembly. The HVPS/cover open

cable is connected to J86 on the engine board and the printhead/cover open cable is connected to J12 on the

RIP board.

POR incomplete, Close Door constantly displays

This symptom is usually associated with the lower switch mounted on the front access door support and with the

left switch mounted in the ITU light shield.

Note:

When the printer is powered on for some time with this symptom displayed, the printer may then display a

902 Service Error.

Step

Action and questions

Yes

No

1

Make sure that the ITU light shield is not out of position.

Is the ITU light shield out of position?

Properly align the

ITU light shield.

Go to step 2

2

Make sure the ITU assembly interlock switch actuator

is not damaged or broken and actuates the switches

correctly.

Is the actuator damaged or broken?

Replace the ITU

assembly. See

“ITU assembly

removal” on

page 4-37

.

Go to step 3

3

Front cover assembly

Does the front cover close correctly?

Go to step 4

Install the front

cover correctly or

repair as

necessary

4

Front cover assembly

Make sure the front cover flag is not broken or

damaged and actuates the switches correctly.

Is the flag broken or damaged?

Replace the front

cover assembly.

See

“Front cover

assembly

removal” on

page 4-10

.

Go to step 5

5

Printhead/cover open interlock cable assembly

Make sure the cable is correctly connected to J12 on

the RIP board.

Is the cable connected correctly?

Go to step 6

Install the cable

correctly.

6

Make sure the front cover is closed and the ITU is

correctly installed. Disconnect J12 from the RIP board

and check for continuity between pins J12-1 and J12-3.

Do you measure continuity?

Replace the RIP

board. See

“RIP

board removal”

on page 4-70

.

Replace the

printhead interlock

cable/switch

assembly.

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 152

Lexmark C750 Manual

Page 152 highlights