Figure 3-3. Serial And Parallel Loopback Connectors - HP 6000 Service Manual

Note that the serial and parallel port tests are more thorough if you connect a loop-back connector to
the port before running the test for that port. See the wiring diagrams below.
HP Omnibook 6000/6100
5
9
6
1

Figure 3-3. Serial and Parallel Loopback Connectors

13
25
These connections
are not used.
Diodes are 1N4004
or equivalent
(I =1A, V
F
V =30-400V)
R
14
1
Troubleshooting and Diagnostics
=1V@1A,
F
3-19