Furuno CH-270, Service Manual

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5.7 Tilt Code Disk Alignment
When the tilt gear bos is reinstalled, alignment of the tilt code disk is required.
The tilt code disk has three slits; two narrow slits for 30° signal and one wide slit +8° and 93°
signals. Two narrow slits should be located in the center of photo sensors on tilt signal (1) and
(2) boards. Note that improper alignment causes the error message “TILT NG” and stoppage of
whole operation; if the mechanical stopper works 8° or 93° signal is produced or if the
two sensors are not activated simultaneously at 30° tilt, the error message is generated.
1) Remove the tilt signal (2) pcb 06P0156.
2) Loosen two socket set-screws on the shaft of the tilt code disk.
Figure 5.13
3) Place the soumdome assembly vertically.
4) Tilt the transducer exactly 30°
Figure 5.14 Placing Soundome Vertically Figure 5.15 Tilting Transducer 30 °