User Guide

8081
8081
N/B Maintenance
N/B Maintenance
110
8.5 Memory Test Error
Extend DDRAM is failure or system hangs up.
Memory Test Error
One of the following components or signals on the motherboard
may be defective ,Use an oscilloscope to check the signals or
replace the parts one at A time and test after each replacement.
Test
OK?
Replace the faulty
DDRAM module.
Yes
No
Parts:
RP2~RP14
RP505~RP517
RP18~RP21
U502
U9
U512
U1~U4
U507~U510
J503
Q19
Q20
R606
R607
R629
Signals:
1.If your system installed with expansion
SO-DIMM module then check them for
proper installation.
2.Make sure that your SO-DIMM sockets
are OK.
3.Then try another known good SO-DIMM
modules.
If your system host bus clock running at
266MHZ then make sure that SO-DIMM
module meet require of PC 266.
Test
OK?
Yes
No
+1.25V_DDR
+2.5V_DDR
+DDR_VREF
CKE [0:3]
CS# [0:3]
SMA [1,2,4,5]
SMAB [1,2,4,5]
NB_MA [0,3,6:12]
NB_MD [0:63]
NB_DQS [0:7]
NB_BA [0,1]
NB_CB [0:7]
NB_DM [0:8]
NB_RAS#
NB_CAS#
NB_WE#
Board-level
Troubleshooting
Replace
Motherboard
Replace the faulty
DDRAM module.
SMB_DATA
SMB_CLK
HCLK_MCH
HCLK_MCH#
66M_MCH
CLK_DDR [0:4]
CLK_DDR [0:4]#