Furuno CH-250 ユーザーズマニュアル

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3. ADJUSTMENTS 
3.1 General 
Checks 
Table 3-1 General checks 
On-keel Installation
Off-keel Installation
Within 1 m
1 cm
400 stroke: 
Minimum 30 cm
250 stroke:
Minimum 22 cm
Check Item
Check point, Rating
Retraction tank level
Clearance between transducer and 
bottom of retraction tank when 
transducer is completely retracted 
by hand crank
Transducer travel 
(lowered by hand clank)
Note: When checking, a clearance 
of approximately 1 meter is required 
under the bottom of the transducer.
Transducer heading
Bow mark on the shaft sleeve should face 
ship's bow.