Brother International HL-1660E Service Manual - Page 101

6.2 DRAM Test (1) To start up the test program: While pressing the Switch (RESET switch), turn the power on. "DRAM CHECK" will be displayed. Then press CONTINUE switch to start DRAM checking. (2) The LCD will display "START DRAM TEST" and the DATA lamp or ALARM lamp will be flashing. (3) On satisfactory completion of all the RAM test, the LCD will display: "DRAM OK!!". (4) If any DRAM has an error, the LCD will display: RAM address WRITE data READ data The following table is the reference. Table 6.1 Video Controller DRAM Address Corresponding Table Address Part replacement Lower order address 0, 4, 8, C 2, 6, A, E #32, 21 *1 #16, 17 Replace with SIMM corresponding to *2 memory map. *1: Replace the DRAM on the Main PCB. *2: Replace the SIMM. Note1: There may be the case that the above sequence doesn't work correctly according to the contents of RAM failure, or in faulty assembly such as soldering bride or ineffective soldering etc. Note2: "PRINT CHECK" may be displayed when getting out from TEST mode. It will disappear in 20 or 30 seconds, displaying "READY" on LCD. It is not a trouble. VI - 25