Brother HL-4570CDW - If You Replace the Laser Unit; Sensitivity Adjustment of Density Sensor (Maintenance Mode: Code 72); Performing the Developing Bias Voltage Correction (Maintenance Mode: Code 83); Performing the Adjustment of Inter-Color Position Alignment (Maintenance Mode: Code 66)

4-8
Confidential
5. IF THE MACHINE ERROR EF IS DETECTED
AND THE LOW-VOLTAGE POWER SUPPLY
PCB ASSY IS REPLACED
5.1 Reset of Irregular Power Supply Detection Counter
The irregular power supply detection counter is counted up when the printer detects irregular
power supply. If the counter reaches to the limit, the printer shows the service error to replace
the low-voltage power supply PCB because it might be damaged by recursive irregular power
supply.
5.1.1 Reset of irregular power supply detection counter using the PJL file
(1) Press the OK button and then the Go button while the printer is in the ready state. Next,
press the button four times to enter the maintenance mode.
The printer displays on the LCD.
(2) Connect the PC to the printer with the USB cable.
(3) Double-click the “FILEDG32.EXE” to start. The following screen appears. Select the
“Brother Maintenance USB Printer”.
(4) Click the “Brother Maintenance USB Printer” icon to select. Drag the SQWAVE.PJL and
drop it.
5.1.2 Reset of irregular power supply detection counter using the
maintenance tool
(1) Check that the printer is in the ready state, and then connect it to the PC with the USB
cable.
(2) Double-click “brmainte.exe” file (maintenance tool) copied to the “hl4000” folder to
activate it.
(3) Click About.
Note:
The maintenance driver must have been installed. (Refer to APPENDIX 3.)
Note:
The printer driver of the relevant model must have been installed.
Note:
Ignore it when a dialog box saying that “New hardware is found” is displayed.