BES X installation manual LCOM line
P/N: 400288005; Rev: L, 09/21 71
Now check the voltage directly on the C1 - LCOM male connector being very careful not to short the
connector’s pins!!!
If the voltage between the 1st and 4th pin is not around 18-20 VDC, then the failed device is either
the 4HD/5HD-HUB or the problem is a short circuit on the LCOM power wires.
NOTE: A short circuit on the female connector giving power to the camera assembly can cause an
overload on the LCOM power supply. In this case, the AUTO-FUSE intervenes after a few seconds (or
minutes) depending on the intensity of the overload. In this situation, the origin of the failure can be
very difficult to find. It must be remembered that the duration of an overload of this kind can cause
unrecoverable damage to the AUTO-FUSE.
LCOM communication wires
When the LCOM problems do not originate from the power wires, first of all it is necessary to check the
communication wires in order to verify that they are not shorted or broken. It is only after this has been done
that the following steps must be followed:
1. Turn the 4HD/5HD-HUB off.
2. Unplug the C1 - LCOM connector from the 4HD/5HD-HUB.
3. Turn the 4HD/5HD-HUB on again and wait for the LCOM error code to appear on screen.
4. Then, being extremely careful not to cause a short circuit, measure the voltage between the 2nd (-)
and 3rd (+) pins of the C1 male connector. The value must be between 0.30 and 0.75 VDC. If not, the
problem is in the 4HD/5HD-HUB itself.
5. Measure the voltage between the 2
nd
(+) and 4
th
(-) pins. The value must be between 2.0 and 2.3VDC.
If not, the problem is in the 4HD/5HD-HUB itself.
6. Measure the voltage between the 3
rd
(+) and 4
th
(-) pins. The value must be between 2.7 and 2.9 VDC.
If not, the problem is in the 4HD/5HD-HUB itself.
7. Turn the 4HD/5HD-HUB off.
8. Insert the C1 - LCOM connector again. A short discharge normally occurs in this case and it is due to
4HD/5HD-HUB internal capacitors.
9. Turn the 4HD/5HD-HUB on again and wait for the LCOM error code to appear on screen.
10. Measure the voltage between the 2
nd
(-) and 3
rd
(+) pins directly on the C1 connector. The value must
be between 0.25 and 0.45 VDC. If not, step 14 must be followed.
11. Measure the voltage between the 2
nd
(+) and 4
th
(-) pins directly on the C1 connector. The value must
be between 2.2 and 2.4 VDC. If not, step 14 must be followed.
12. Measure the voltage between the 3
rd
(+) and 4
th
(-) pins directly on the C1 connector. The value must
be between 2.5 and 2.8 VDC. If not, step 14 must be followed.
13. At this stage, the only way to find the defective switch is to check each LCOM device by moving them
one-by-one on to another pair of lanes.
14. The following test must be done only if one of the procedures in steps 10, 11 and 12 has not been
successful.
If the wires have already been carefully checked, it is recommended to disconnect the devices
connected to the LCOM one-by-one in order to find the one causing the defect. The suggested order
of procedures is the following (only some of the subsequent boards may be present in the LCOM
network you are testing):
a. Turn the 4HD/5HD-HUB off and disconnect the camera assembly from the LCOM (it is enough
to disconnect the 2nd and 3rd wires). Turn the 4HD/5HD-HUB on and wait for the error code
to appear on screen. Then, leaving C1 plugged into the 4HD/5HD-HUB, check the voltages as
stated in steps 11 and 12. If these voltages are OK, switch off the 4HD/5HD-HUB and retry
the whole system by replacing the camera board (or the whole camera assembly).
b. Turn the 4HD/5HD-HUB off and disconnect the Pinspotter Interface from the LCOM (it is
enough to disconnect the 2nd and 3rd wires). Turn the 4HD/5HD-HUB on and wait for the
error code to appear on screen. Then, leaving C1 plugged on the 4HD/5HD-HUB, check the
voltages as stated in steps 11 and 12. If these voltages are OK, switch off the 4HD/5HD-HUB,
replace the Pinspotter Interface and repeat the previous procedures.
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