7-4 Troubleshooting
Serial device does not work Check if device driver is installed properly.
Check if serial device is connected properly.
Check the device drive installation for any IRQ or I/O
address conflict.
Replace serial device.
Check the I/O controller chip on the main board for any
cold or loose soldering.
Replace the I/O board.
Parallel device does not work Check all connections.
Check if external device is turned on.
Check the device drive installation for any IRQ or I/O
address conflict.
Test another parallel device.
Check I/O controller chip on the main board for any
cold or loosed soldering.
Replace the I/O board.
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