LCOM line BES X installation manual
70 P/N: 400288005; Rev: L, 09/21
2. Care must be taken to make note of the wiring sequence on the four-conductor cable, as it is
imperative that these wires are connected to the replacement device in the same way.
If, for any reason, you are unsure how to do a re-connection, check the LCOM line starting from the
4HD/5HD-HUB C1 - LCOM connector.
3. Reconnect the main voltage to the 4HD/5HD-HUB only after you are absolutely sure that the correct
connections have been made.
6.3 Solving problems on the LCOM line
Introduction
As the four wires constituting the LCOM network are shared by all the devices connected to it, a fault in any
one of the devices can cause the malfunction of the entire LCOM network. This situation is initially detected
by the 4HD/5HD-CPU during the lane boot-up and an error code is displayed on the monitors of both lanes.
In order to determine the cause of the problem, which could be due to: a bad connection, a damaged
electronic board, or a damaged cable, the following tests can be done.
Power wires
The 4HD/5HD-HUB C1 - LCOM connector supplies the power to all the LCOM electronic devices. The first wire
on top is the positive power, while the fourth wire on the bottom is the negative; this pair of wires is also
called LCOM power wires.
LCOM power check
Use a multimeter to check the LCOM power voltage on all the LCOM connections; its value should be at least
16 VDC but no more than 23 VDC (the optimal voltage is around 18-19 VDC).
Look at the status of the indicators listed below (only some of the following boards may be present in the
LCOM network you are testing):
• The camera assembly display should have some segments or dot on.
• The Pinsetter Interface with the power on should have some LEDs blinking or on.
The result of the above-mentioned operations should be one of the following:
1. If both the voltage and the status LEDs are OK, the problem is associated with the communication
wires of the LCOM network.
2. If the power is present only on certain connectors, it is evident that there is a problem within the
cables or connections to the affected device(s) since the power source is the 4HD/5HD-HUB, the
problem should be easily detected.
3. If the power voltage is OK everywhere, but one of the device indicators is off, then in this case the
board with the indicator off is probably broken. Switch the 4HD/5HD-HUB off, replace the broken
board and switch the 4HD/5HD-HUB back on again. If you still have LCOM problems, repeat all the
above tests again.
4. If the whole LCOM power fails, the possible causes are:
• The 4HD/5HD-HUB LCOM power supply section is broken;
• The LCOM power wires are shorted.
As the LCOM power supply is protected by an AUTO-FUSE located inside the 4HD/5HD-HUB, a short
circuit to the power wires causes the ‘blowing’ of this AUTO-FUSE and the power supply on the LCOM
network is shut down.
In order to understand if this is the problem, you must unplug the LCOM from the 4HD/5HD-HUB
and wait for 1 minute to let the AUTO-FUSE reset, thus restoring the LCOM power.
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