Klein Marine Systems, Inc. HYDROCHART 3500, Operation And Maintenance Manual

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4-2
CHAPTER 4 Maintenance
HydroChart 3500 Sonar System Operations and Maintenance Manual P/N 11210087, Rev. 03
4.3 Disassembling and Reassembling the Sonar
Head Unit
For troubleshooting purposes and for repair, it may be required to remove and
replace major components of the Sonar Head Unit. Instructions are provided in the
following pages for the disassembly of the Sonar Head Unit and the removal of the
transducer arrays and sonar electronics chassis.
The following tools are recommended:
• 4-mm hex key
• Phillips screw driver
• 10-mm diameter, 1.5-mm pitch, 7 inches or longer threaded rod
• Lint-free cloth or paper towels
• Silicone grease, such as Dow-Corning DC4
4.3.1 Disassembling
the Sonar Head
Unit
To disassemble the Sonar Head
Unit:
1.
Turn off the TIU.
2.
Disconnect the deck cable
from the Sonar Head Unit
and set the Sonar Head
Unit on a clean flat surface
such that the carrying
handles face up.
3.
Remove the twelve
M6 x 16 mm Phillips head
screws that secure the top
of the forward and aft
fairings to the frame.
Figure 4-1:
Removing the Phillips Head Screws
from the Top of the Forward and Aft Fairings
Fairing