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3. Tests and Diagnostics 3.5 PIO Loopback Test
3.5 PIO Loopback Test
The PIO loopback test will check below items through PIO loopback connector.
External Interrupt
External Loopback
- including Pattern test, Data Pin test, Control register test & Control pin/ Status
pin
test.
NOTE: Remember to connect a PIO loopback connector to the computer's printer port
before test begins.
The screen should display as below, indicating whether the test is passed or failed when
finished.
3-8 Satellite P20-25 Series Maintenance Manual