Furuno CH-270 - Manual (Page 107)

6. MAINTENANCE, TROUBLESHOOTING
6-3
Hull unit CH-184
1. Turn off the breaker switch on the hull unit.
2. Slightly loosen the bolts fastening the shaft retainer.
3. Raise and lower the shaft by hand to confirm that it raises and lowers smoothly. If it
does not rise or lower smoothly, do not use force; the shaft may bend.
4. Tighten bolts on shaft retainer. (Torque: 20-25 Nm)
5. Turn on the breaker switch.
6.4 Transducer Maintenance
When the ship is dry-docked, remove marine growth from the transducer with fine
sandpaper or a piece of wood.
CAUTION
Do not paint the transducer face.
Loss of sensitivity will result.
Do not use chemical-based cleaners to
clean the transducer.
They can damage the transducer.
6.5 Fuse Replacement
The fuses in the hull and transceiver units protect them from overcurrent, equipment fault
and reverse polarity of the ship’s mains. If the power cannot be applied the fuse in the
transceiver unit may have blown. Have a suitably qualified technician check the fuse.
CAUTION
Use the proper fuse.
Use of a wrong fuse can cause fire or
damage the equipment.