138
7321 N/B Maintenance
7321 N/B Maintenance
Try another known good KB.
SIO test error
Board-level
Troubleshooting
Yes
No
Re - test
OK?
1. Check whether cables , KB& KB
driver are installed properly.
2. Check if KB is on and in ready status.
Yes
No
BIOS
Setup
OK?
Correct it.
Correct it
One of the following parts or signals on the motherboard may be
Defective, plug in SIO loop back at SIO port and run SIO test
program then use an oscilloscope to check the following signals
or replace the parts one at a time and test after each replacement.
Parts:
U24 U1
Q1 Q2
D1 CA2
CA1 C12
C288 J505
Signals:
Ok?
Yes
Replace
KB.
No
S_RTE# S_TXD#
S_DTR# S_CTS#
S_RXD# S_DCD#
S_DSR# S_RI#
SUSA# COM1R#
Replace
M/B board
8.13 SIO Port Test Error
Symptom:
When a SIO device(Such as SIO KB) command is issued, SIO device can not active.
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