Document: 990-0000046-1000
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7
TROUBLESHOOTING & REPAIR
This section provides information on isolating problems to the major component or subassembly
level. Once the problem area is isolated, the defective item should be replaced and returned to
EdgeTech for disposition. It is recommended that a complete set of spare boards and replaceable
subassemblies be kept onboard or at a readily accessible service center or depot facility.
The circuit boards contain static-sensitive devices. These devices are extremely sensitive to
static electrical charges that may develop on the body and clothing. Extreme care should be
taken when handling these components. Use anti-static protection materials and personnel
grounding straps during handling.
It is recommended that all attempts be made to see if a problem is external to the towfish
before opening it. Only open the towfish body as a last resort when it has been established
that the problem is internal to the towfish.
7.1
A
CCESS
/R
EMOVAL
Follow the procedures below to gain access to the internal components. Reverse the order to
reassemble. Note: Except for the transducers, all external hardware is mounted to the towfish
body with 4mm socket hex bolts.
Warning
Potentially Lethal Voltages Are Present in the Instrument
when it is powered from the topside or any other power unit.
7.1.1
T
OOLS
Tools for access and service include:
•
Phillips-head screw driver #2
(1)
•
Flat-blade screw driver 1/8
•
Socket driver 8mm
(1)
•
Allen key 4mm
(1)
•
Needle-nose pliers
(1)
•
Silicone grease
(1)
•
O-ring 2-154 N1470-70
(1)
Note:
(1)
These items are included in spares kit
7.1.2
P
RELIMINARY
Prior to servicing the towfish, disconnect the mechanical and electrical connections to the tow
cable. Protect all disconnected underwater connectors. Ensure that they are kept clean and
