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If only the +3.3V Power LED is out:
• Verify +5VDC at F1 or J8 (replace board if +5VDC is not available)
• Verify +3.3VDC across C33 on top of board
• If +3.3V is not available replace the board with a spare.
• If +3.3V is available check the display LED (D5).
1.3.6 Optical Section Testing
For surface boards, if the "FIBR A" or "FIBR B" LED is off or flickering, one or more of
the following conditions is likely:
• The fiber is broken or damaged.
• The optical transceiver module is defective at either the surface or subsea board.
• Excessive light loss (low received optical power) is being experienced.
• The Mini4 board (not the optical transceiver module) is malfunctioning.
• There is not enough attenuation in the optical link and the receiver is saturating.
If excessive optical loss is being experienced, the following conditions may be present:
• May have sonar data errors.
• Check the optical level with an optical power meter and inspect all fiber optic
connections including CWDMs and slip rings.
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 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.
1.3.7 Sonar Testing
If one or both sonar data channels (links) are out or has errors:
• Using a signal generator set for about 5MHz squarewave with a amplitude of about
1Vp-p, insert this signal into appropriate connector (J5 or J9) of the channel being
tested. The test signal should be input into subsea (vehicle) Dual Sonar board.
• On the other end of the link, connect an oscilloscope to the corresponding connector (J5
or J9). Verify that there is a 5MHz squarewave being output from the surface Dual
Sonar board and that the signal is not distorted or has glitches (noise) in the signal.
• If the channel is not operating correctly, first check the field wiring. If the wiring
appears correct, then first replace the subsea Dual Sonar board with a spare and check
the sonar link again. If the problem is still there, replace the surface Dual Sonar board,
with a spare and check the link again.
201630-xxx Mini4 Dual Sonar Board Manual, Preliminary
Page 12 of 14
2/23/09
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