Figure 3-3. Serial And Parallel Loopback Connectors - HP Omnibook XT6050 Service Manual

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Note that the serial and parallel port tests are more thorough if you connect a loop-back connector to
the port and enable the external loopback option before running the test for that port. See the wiring
diagrams below.
HP Omnibook XT6050, XT/VT6200
5
9
6
1

Figure 3-3. Serial and Parallel Loopback Connectors

1 3
2 5
These connections
are not used.
Diodes are 1N4004
or equivalent
(I =1A, V
F
V =30-400V)
R
1 4
1
Troubleshooting and Diagnostics
=1V@1A,
F
3-21