Reset Irregular Power Supply Detection Counter Of Low-Voltage Power Supply Pcb; Firmware Installing Mode; Ready State Of Maintenance Mode For Service Personnel - Brother HL-2290 Service Manual

1.4.14 Reset irregular power supply detection counter of low-voltage power
supply PCB
This function is used to reset the number of irregular power supply errors in the main PCB
after replacing the low-voltage power supply PCB.
<Operating Procedure>
(1) Open the front cover while the power switch is turned OFF.
(2) Press and hold the [Go], and turn ON the power switch. The Toner, Drum, and Paper
LEDs light.
(3) Release the [Go]. All LEDs go out.
(4) Press the [Go] twice. The Toner, Drum, and Paper LEDs light.
(5) Press the [Go] 12 times. Toner, Drum, and Paper LEDs go out in a second and the
irregular power supply detection error is released. Close the front cover. When the error
is released, the machine returns to the ready state.

1.4.15 Firmware installing mode

This mode is used to write the firmware (main program).
Refer to "1.2 Installing Firmware (Sub firmware and main firmware)" in Chapter 4
detailed procedure.

1.4.16 Ready state of maintenance mode for service personnel

Drivers of the same number of virtual USB devices are required for the computer to
recognize the USB-connected terminals. If the machine is connected to the computer at each
time any repair work is performed, virtual USB devices with the same number of the repaired
machines are automatically configured on the computer. To prevent numerous virtual USB
devices from being configured, entering maintenance mode for service personnel enables
your computer to identify multiple terminals via one single virtual USB device.
Enter this mode when using the download utility or service setting tool by installing the
maintenance driver.
<Operating Procedure>
(1) Open the front cover while the power switch is turned OFF.
(2) Press and hold the [Go], and turn ON the power switch. The Toner, Drum, and Paper
LEDs light.
(3) Release the [Go]. All LEDs go out.
(4) Press and hold the [Go] until the Paper LED lights, then release the [Go]. The machine
returns to the ready state of maintenance mode for service personnel. Close the front
cover.
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