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Lexmark C750 Service Manual - Page 78

Lexmark C750 Manual

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5060-00x Step 10 Action and questions Check to see if the ITU drive motor is turning during POR. Observe the ITU motor during POR by removing the rear cover. Is the ITU drive motor turning? Yes Replace the ITU assembly. See "ITU assembly removal" on page 4-37 Go to step 12 No Go to step 11 11 Make sure the ITU drive motor assembly cable is correctly installed to the ITU drive motor and at connector location J64 on the engine board. Is the cable correctly installed? Install the cable correctly 12 Make sure the ITU autoconnect cable is installed correctly at connector location J72 on the engine board. Is the cable correctly installed? Go to step 13 Install the cable correctly 13 Make sure the ITU autoconnect connector in the printer is seated correctly in the connector plate. Is the connector seated correctly? Go to step 14 Install the connector/cable correctly Replace the ITU autoconnect cable 14 Check continuity of the ITU autoconnect cable. Is there continuity? Replace the following FRUs in the order shown: 1. ITU assembly. See "ITU assembly removal" on page 4-37 2. Engine board. See "Engine board removal" on page 4-29 120 Error code An incorrect hot roll lamp is installed. CAUTION: Make sure the lamp is cool before removing it from the assembly. The Hot Roll and Backup Roll may have the wrong voltage lamp installed. Step 1 Action and questions Is the correct fuser assembly installed in the printer? See "Fuser" on page 7-8 for the part number. Yes Go to step 2 No Install the correct fuser assembly. See "Fuser assembly removal" on page 4-31. Install the correct fuser lamp in the fuser assembly. 2 Is the correct fuser hot roll lamp installed in the fuser assembly? See "Fuser" on page 7-8 for the part number. Go to step 3 2-44 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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2-44

Service Manual

5060-00

120 Error code

An incorrect hot roll lamp is installed.

CAUTION:

Make sure the lamp is cool before removing it from the assembly.

The Hot Roll and Backup Roll may have the wrong voltage lamp installed.

Check to see if the ITU drive motor is turning during

POR. Observe the ITU motor during POR by removing

the rear cover.

Is the ITU drive motor turning?

Replace the ITU

assembly. See

“ITU assembly

removal” on

page 4-37

Go to step 11

Make sure the ITU drive motor assembly cable is

correctly installed to the ITU drive motor and at

connector location J64 on the engine board.

Is the cable correctly installed?

Go to step 12

Install the cable

correctly

Make sure the ITU autoconnect cable is installed

correctly at connector location J72 on the engine

board.

Is the cable correctly installed?

Go to step 13

Install the cable

correctly

Make sure the ITU autoconnect connector in the printer

is seated correctly in the connector plate.

Is the connector seated correctly?

Go to step 14

Install the

connector/cable

correctly

Check continuity of the ITU autoconnect cable.

Is there continuity?

Replace the

following FRUs in

the order shown:

1. ITU assembly.

See

“ITU

assembly

removal” on

page 4-37

2. Engine board.

See

“Engine

board

removal” on

page 4-29

Replace the ITU

autoconnect cable

Step

Action and questions

Yes

Is the correct fuser assembly installed in the printer?

See

“Fuser” on page 7-8

for the part number.

Go to step 2

Install the correct

fuser assembly.

See

“Fuser

assembly

removal” on

page 4-31

Is the correct fuser hot roll lamp installed in the fuser

assembly? See

“Fuser” on page 7-8

for the part

number.

Go to step 3

Install the correct

fuser lamp in the

fuser assembly.

Step

Action and questions

Yes