Brother HL 1240 - B/W Laser Printer Service Manual page 7

CHAPTER 6 TROUBLESHOOTING........................................................6-1
1. INTRODUCTION ................................ ................................ ................................ .....6-1
1.1 Initial Check ......................................................................................................................6-1
1.2 Warnings for Maintenance Work.......................................................................................6-2
1.3 Identify the Problem ..........................................................................................................6-3
2. OPERATOR CALLS & SERVICE CALLS ................................ ................................ 6-4
2.1 Operator Calls...................................................................................................................6-4
2.2 Service Calls .....................................................................................................................6-4
3. ERROR MESSAGES................................ ................................ ............................... 6-6
3.1 Error Messages in the Status Monitor ..............................................................................6-6
3.2 Error Message Printouts ...................................................................................................6-8
4. PAPER PROBLEMS................................ ................................ ................................ 6-9
4.1 Paper Load Problems .......................................................................................................6-9
4.2 Paper Jams.....................................................................................................................6-10
4.2.1 Clearing the jammed paper............................................................................................... 6-10
4.2.2 Causes & countermeasures.............................................................................................. 6-11
4.3 Paper Feeding Problems ................................................................................................6-12
5. SOFTWARE SETTING PROBLEMS ................................ ................................ .....6-14
6. MALFUNCTIONS................................ ................................ ................................ ...6-18
7. IMAGE DEFECTS................................ ................................ ................................ ..6-23
7.1 Image Defect Examples..................................................................................................6-23
7.2 Troubleshooting Image Defect........................................................................................6-24
7.3 Location of Grounding Contacts .....................................................................................6-41
7.3.1 Drum unit .......................................................................................................................... 6-41
7.3.2 Printer body & paper cassette........................................................................................... 6-41
8. INCORRECT PRINTOUT ................................ ................................ ...................... 6-42
9. INSPECTION MODE ................................ ................................ ............................. 6-45
9.1 Test Print Mode...............................................................................................................6-45
9.2 Inspection Mode..............................................................................................................6-46
APPENDICES
1. SERIAL NO. DESCRIPTIONS ................................ ................................ ................ A-1
2. DIAMETER / CIRCUMFERENCE OF ROLLERS................................ .................... A-3
3. PRINT SPEEDS WITH VARIOUS SETTINGS ................................ ........................ A-4
4. HOW TO KNOW DRUM UNIT LIFE & PAGE COUNTER ................................ ...... A-5
5. HOW TO USE THE SELF-DIAGNOSTICS TOOLS ................................ ............. A-10
6. NVRAM DEFAULT VALUE ................................ ................................ ................... A-14
7. PAPER CASSETTE INFORMATION (FOR EUROPE ONLY)............................... A-15
8. CONNECTION DIAGRAM, HL-1240................................ ................................ ..... A-16
9. CONNECTION DIAGRAM, HL-1250................................ ................................ ..... A-17
10. MAIN PCB CIRCUIT DIAGRAM, HL-1240 (1/2)................................ .................... A-18
v
TABLE OF CONTENTS