LCOM line BES X Installation Manual, Rev.9, Jun 2018
86
86 P/N: 400288005
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 multi-meter 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 (in the LCOM network you are testing only some of the
following boards may be present):
The camera assembly should have on some segment or dot.
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 all right: 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 all right 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 on again. If you still have LCOM problems start 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.
Since 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 have to unplug the LCOM from the 4HD/5HD-HUB
and wait for 1 minute to let the AUTO-FUSE reset thus restoring the LCOM power.
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 power wires do not originate LCOM problems, first of all it is necessary to check the
communication wires in order to verify their being neither shorted nor broken. It is only after this that the
following steps must be followed:
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