Dram Test Mode - Brother HL-2600CN Service Manual

2.3

DRAM Test Mode

This mode tests DIMMs installed on the main (video controller) PCB.
<Procedure>
1) To start the test program:
While holding down the Go button and + button, turn on the power. "DRAM
CHECK START" will be displayed. Press the Job Cancel button to start the DRAM
check.
2) The LCD will display "START DRAM TEST", and the Data LED blinks.
3) On satisfactory completion of all the RAM tests, the LCD will display: "DRAM OK!!",
and the Alarm LED is on.
4) If any DRAM error has occurred, the LCD will display a fail message as follows;
RAM Address
5) Enter the hidden menu mode as follows to confirm the current memory map;
i) Press the -, + and Set buttons in this order while holding down the Go button.
ii) The LCD will display "HIDDEN PANEL"
iii) Select the "DRAM ADDRESS" menu using the scroll buttons.
iv) Whenever the Set button is pressed, the LCD will display the DRAM error
address on Slot 1, Slot 2, and Slot 3 in turn.
6) If a DIMM DRAM has an error, replace the DIMM corresponding to the above
memory map information.
Note:
x
There may be a case where the above sequence does not work correctly due to
complete RAM failure, or in faulty assembly such as a solder bridge or ineffective
soldering etc.
x
"PRINT CHECK" may be displayed when exiting from the Test mode. It will disappear
in 20 or 30 seconds, displaying "READY" on the LCD. It is not a fault.
WRITE data
V-7
READ data