BES X Installation Manual, Rev.9, Jun 2018 LCOM line
P/N: 400288005 87
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 on screen.
4. Then, being extremely careful to do not 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 2nd(+) and 4th(-) 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 3rd(+) and 4th(-) 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 on screen.
10. Measure the voltage between the 2nd(-) and 3rd(+) pins directly on the C1 connector. The value
must be between 0.25 and 0.45 VDC. If not, the step 14 must be followed.
11. Measure the voltage between the 2nd(+) and 4th(-) pins directly on the C1 connector. The value
must be between 2.2 and 2.4 VDC. If not, the step 14 must be followed.
12. Measure the voltage between the 3rd(+) and 4th(-) pins directly on the C1 connector. The value
must be between 2.5 and 2.8 VDC. If not, the step 14 must be followed.
13. At this stage, the only way to find the defective switch is to check each LCOM device by inserting
them one by one in 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 advisable to disconnect one by one the
devices connected to the LCOM in order to find the one causing the defect. The suggested order of
procedures is the following (in the LCOM you are testing, only some of the subsequent boards are
present):
a. Turn the 4HD/5HD-HUB off and disconnect the camera assembly from the LCOM (it is
sufficient to disconnect the 2nd and 3rd wires). Turn the 4HD/5HD-HUB on and wait for the
error code 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 okay, 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
sufficient to disconnect the 2nd and 3rd wires). Turn the 4HD/5HD-HUB on and wait for the
error code 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 okay, switch off the 4HD/5HD-HUB, replace
the Pinspotter Interface and repeat previous procedures.
When after the disconnection of all electronic components from the LCOM line, the voltages on C1
are still not on the range indicated on steps 11 and 12, the problem surely has to be found in the
wires.
NOTE: a problem with the LCOM cable (i.e.: short circuit) can affect the entire scoring system causing a
reboot of the pair of lanes.
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