Brother HL-4000CN, Service Manual

Page: 253 / 345

V-43
4.7 ESS Diagnosis
Function: Executing an ESS related diagnosis.
Operation procedure:
1. Enter the Diag. (C/E) mode.
2. Select [CE Maintenance ESS Diag] with the and buttons.
3. Press the Form Feed/Set button to advance to diagnostic menu selection in [CE
Maintenance ESS Diag].
4. Select a diagnostic item with the or button. (For the contents of the
diagnostic items, refer to the table below.)
5. Press the Form Feed/Set button to determine the selection.
Example: Code ROM test display screen
6.
Press the Form Feed/Set button again to execute the diagnosis. The LCD panel displays
the result ([No Problem]/[Error]).
Example: Code ROM test
7.
Press the Job Cancel/Back button to return to the previous screen.
Diagnostic items
Item Description
Normal Diag Executes a diagnosis in Normal mode.
CodeROM Test Calculates the ROM checksum and compares it with the stored value.
FontROM Test Calculates the font ROM checksum and compares it with the
stored value.
EEPROM Test Writes, reads, and verifies the EEPROM diagnostic area.
DRAM Test Performs a OPEN/SHORT test on the DRAM address line.
Writes, reads, and verifies the DRAM front.
Centro Test Performs a register check test.
USB Test Performs a register check test.
REMORA Test Performs a register check test.
Cont Panel Test Tests the LED, LCD, and buttons on the control panel.
IOT Test Tests IOT communications.
HD Test Tests the hard disk.
CodeROM Test
Start
CodeROM Test
Processing
CodeROM Test
No Problem