Brother HL-4200CN - Page 353

1.1.1 When Controller Board (ESS) is replaced
 Take the EEPROM (U8) out of the Controller Board, then put it in the new U8
on Controller Board.
 Take out the NIC EXCORD ASSY, then put it on the new Controller Board.
1.1.2 When MCU PWBA is replaced
When you replace MCU PWBA, you must temporary save NV-RAM data in EEPROM of
Controller Board.
1. Turn the power on while pressing the [↑] and [↓] buttons together.
2. Enter the password.
(Password; Press the [ ↓ ] button twice and Form Feed/Set button).
3. Select [CE Maintenance / IOT Diag] with the [↑] and [↓] button, and press the [Set]
button.
4. Select [IOT Diag / Digital Input] with the [↑] or [↓] button and press the [Set] button.
5. Select [NVM Settings / NVM Save] and press the [Set] button.
6. Press the [Set] button to copy the MCU NV-RAM data to ESS NV-RAM.
7. Replace the MCU PWBA.
8. Turn the power on while pressing [↑] and [↓] buttons together.
9. Enter the password.
(Password; Press the [ ↓ ] button twice and the [Form Feed/Set] button).
10. Select [CE Maintenance / IOT Diag] with the [↑] or [↓] button, and press the [Set]
button.
11. Select [IOT Diag / Digital Input] with [↑] or [↓] button and press the [Set] button.
12. Select [NVM Settings / NVM Load] and press the [Set] button.
13. Press the [Set] button to copy the original MCU NV-RAM data to the new MCU
NV-RAM.