Sonardyne 7986, Руководство по эксплуатации

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OM-7986
Page 14 of 23 Issue A - Rev 8
3. MAINTEINANCE
3.1 Battery Changing
The battery packs can be changed in the field without any specialist equipment. Ensure that
a clean dry environment is available when disassembling the unit.
Unscrew the two stainless steel M3 counter-sunk screws fitted to the release endcap by
approximately 7mm. There is no need to remove the screws. Remove the two stainless
steel 8mm diameter retaining bars by pushing them through from one end. Now pull on the
release nut or shaft to extract the inner assembly as shown in the picture below.
Using a pair of pliers carefully pull out the string-loaded red pressure-relief valve in the
release mechanism endcap. The valve is designed to vent any large build-up of internal
pressure due to gassing of alkaline or particularly lithium battery packs.
WARNING – Vent any build up of internal gas in a well ventilated area as possible gassing
from Lithium battery packs could be potentially dangerous.
Fig.9 – Outer Housing (above), Inner Pressure Housing,
2 x Retaining Bars and 3/8 inch OD Shackle
Now remove the transducer endcap by carefully rotating and pulling. It is not necessary to
disconnect the transducer wire. Disconnect the battery pack 3-way connector as shown in
the picture below and pull out the battery pack.
Insert the new battery pack and using a pair of needle nosed pliers reconnect the 3-way
connector to the socket marked ‘BATTERY’ (left of capacitor with capacitor uppermost).
Ensure that the o-rings and sealing surface of the pressure housing are clean and free from
dirt or hairs and undamaged, re-assemble the transducer endcap into the housing. If o-rings
or sealing surfaces are damaged then replace.
Positive internal pressure, due to compression by the endcaps, can be relieved by pulling out
the pressure relief valve. This aids assembly into the inner or outer housings.
Slide the assembly back in the outer housing, insert the retaining bars and tighten the
counter-sunk screws.
IMPORTANT - now test the transponder on the previously programmed identity using the
surface unit. If not tested soon after re-connection of the battery then the transponder may be
left in a high current state causing the battery pack to drain quickly.