Brother MFC620CN Service Manual page 257

This chapter describes the maintenance mode which is exclusively designed for the purpose of
checks, settings and adjustments using the keys on the control panel.
In the maintenance mode, you can update memory (EEPROM: electrically erasable
programmable read-only memory) contents for optimizing the drive conditions of the
head/carriage unit, paper feed roller or paper ejection roller (if they have been replaced) or for
setting the CIS scanner area, for example. You can also customize the EEPROM according to
the shipment destination of the machine concerned. In addition, you can perform operational
checks of the LCD, control panel PCB or sensors, perform a print test, display the log
information or error codes, and modify firmware switches (WSW).
8.1 EMBEDDED AND FULL MAINTENANCE PROGRAMS ............................................... 8-1
8.2 ENTRY INTO THE MAINTENANCE MODE ................................................................... 8-3
8.3 LIST OF MAINTENANCE-MODE FUNCTIONS ............................................................. 8-4
8.4 USER-ACCESS TO THE MAINTENANCE MODE ......................................................... 8-5
8.5 DETAILED DESCRIPTION OF MAINTENANCE-MODE FUNCTIONS ......................... 8-7
8.5.1 EEPROM Parameter Initialization (Function code 01, 91) .................................. 8-7
8.5.2 Printout of Scanning Compensation Data (Function code 05) ............................ 8-8
8.5.3 Test Pattern (Function code 09) ........................................................................ 8-10
8.5.4 Firmware Switch Setting and Printout (Function codes 10 and 11) .................. 8-12
8.5.5 Operational Check of LCD (Function code 12) ................................................. 8-17
8.5.6 Operational Check of Control Panel PCB (Function code 13) .......................... 8-19
8.5.7 Sensor Operational Check (Function code 32) ................................................. 8-21
8.5.8 Transfer of Received FAX Data and/or Equipment's Log (Function code 53) .. 8-23
8.5.9 Fine Adjustment of Scanning Start/End Position (Function code 54) ............... 8-25
8.5.10 Acquisition of White Level Data and CIS Scanner Area Setting
(Function code 55)............................................................................................. 8-26
8.5.11 Updating of Paper Feeding Correction Value (Function code 58) .................... 8-27
8.5.12 CIS Travel Check (Function code 59) ............................................................... 8-31
8.5.13 Travel Check of the Head/Carriage Unit and Initial Setup Mode
(Function code 63)............................................................................................. 8-33
8.5.14 Alignment of Vertical Print Lines in Monochrome (Function code 65) .............. 8-34
8.5.15 Margin Adjustment in Near-edge Printing (Function code 66) .......................... 8-37
8.5.16 Updating of Property Data (Function code 68).................................................. 8-40
8.5.17 Initial Adjustment of PWM Value (Aging of the Head/Carriage Unit)
(Function code 69)............................................................................................. 8-42
CHAPTER 8 MAINTENANCE MODE
CONTENTS
Confidential