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6.2 DRAM Test
(1) To start up the test program:
While pressing the
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
The following table is the reference.
Table 6.1 Video Controller DRAM Address Corresponding Table
$08000000
-$081FFFFF
$08200000
-$099FFFFF
*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.
Switch (RESET switch), turn the power on. "DRAM CHECK" will be
WRITE data
Address
Lower order
address
0, 4, 8, C
1, 5, 9, D
2, 6, A, E
3, 7, B, F
VI - 25
READ data
Part replacement
#32
#30
#27
#22
Replace with SIMM
corresponding to
memory map.
*1
*2
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