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To determine if the fiber is broken, a laser module is out, or the board is malfunctioning, first:
Verify that the optical transceiver is tight in its socket.
Verify that shunts (jumpers) are placed per system jumper configuration.
Check all fiber optic connections including WDM/CWDMs and slip rings to make sure that they
are not causing the problem.
Check that the optical fiber cable is straight at connectors on board for minimum optic loss.
1.3.8 Video Section Testing
If one or more video channels are tearing or have a low video level:
First, try to adjust the gain on the Mini4 Input board, utilizing trim pots VR1 thru VR4. These trim
pots are next to the video connectors.
Next, try to adjust the gain on Mini4 Output board, utilizing trim pots VR1 thru VR4. These trim
pots are next to the video connectors.
If one or more video channels are out:
Verify that Mini4 Input board is installed on camera side of link (Usually ROV end) and that
Mini4 Output board is installed in the monitor side of the link (usually the surface unit).
Inspect cameras, cables, connectors, and monitors for damage and repair/replace if necessary.
Verify that the video level LEDs on the Video Input board is lit to indicate that a video signal is
present at the video input connector. Check the video signal at the connector with a monitor or an
oscilloscope.
If a video signal is present at the Video Input board, replace the board with a spare. If this does not
fix the problem, replace the Video Output board with a spare.
1.3.9 Data Section Testing
If one or more RS-232 data channels are out or has errors:
Run RS-232 data into appropriate pins of connector J5 of the channel being tested. The RS-232 data
can be input into either the remote vehicle or surface Mini4 board.
On the other end of the link, short the same pins of connector J3 of the Mini4 RS-232 channel being
tested. This will allow the two Mini4 boards to talk to each other in loop back. Both RX and TX
LEDs on both boards should be lit and/or flickering in response to the data traffic.
If the RS-232 data channel is not operating correctly, first check the RS-232. If the wiring appears
correct, then first replace the Video Input board with a spare and check the RS-232 channel again. If
the problem is still there, return the original Video Input board, replace the Video Output board with a
spare and check the RS-232 again.
If any of the LEDs are not operating correctly check one of the other channels. If the LEDs operate
on that channel, replace the Mini4 board with a spare board or use the working channels only.
If one or more RS-485 data channel is out or has errors:
Run RS-485 data into appropriate pins of connector J5. The RS-485 data can be input into either the
remote vehicle or surface Mini4 board.
Mini4, Rev C
(201580-xxx And 201590-xxx)
Page 17 of 19
February 23, 2009
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