Brother 1660e - B/W Laser Printer, Руководство по обслуживанию

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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.
Address
Part replacement
Lower order address
0, 4, 8, C
2, 6, A, E
Replace with SIMM
corresponding to
memory map.
*1
#32, 21
#16, 17
*2
Table 6.1 Video Controller DRAM Address Corresponding Table
*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.