![](/images/new-backgrounds/1220849/220849165x1.webp)
Note that the serial and parallel port tests are more thorough if you connect a
5 9
16
1 3
2 5
These connections are not used.
Diodes are 1N4004
or equivalent
(IF=1A, VF=1V@1A,
1 1 4
Figure 3-3. Serial and Parallel Loopback Connectors
HP Omnibook 500 | Troubleshooting and Diagnostics |