Ess Diagnosis - Brother HL-4000CN Service Manual

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
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
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
Normal Diag
CodeROM Test
FontROM Test
EEPROM Test
DRAM Test
Centro Test
USB Test
REMORA Test
Cont Panel Test
IOT Test
HD Test
or
CodeROM Test
Processing
Executes a diagnosis in Normal mode.
Calculates the ROM checksum and compares it with the stored value.
Calculates the font ROM checksum and compares it with the
stored value.
Writes, reads, and verifies the EEPROM diagnostic area.
Performs a OPEN/SHORT test on the DRAM address line.
Writes, reads, and verifies the DRAM front.
Performs a register check test.
Performs a register check test.
Performs a register check test.
Tests the LED, LCD, and buttons on the control panel.
Tests IOT communications.
Tests the hard disk.
V-43
and buttons.
button. (For the contents of the
CodeROM Test
Start
CodeROM Test
Description
No Problem