Furuno CN-24, Service Manual

Page: 34 / 90

4-4
4.2.2 Sounding Rate
The sounding rate is set with S2 (#1) DIP switch on the CONT-B 01P5741 board. The
switch is factory-set to "HIGH" (190 times/min).
When "LOW" is selected, the rate is down to 1/3 approximately. See table below.
The relation between sounding rates and Upward/Downward ranges is shown below.
RANGE
(Up/Down) 80/
80 160/
80 160/
160 320/
80 320/
160 320/
320 640/
80 640/
160 640/
320 640/
640
Sounding Rate LOW 63 59 55 51 48 43 37 36 33 27
HIGH 190 177 165 154 145 130 113 108 99 81
4.2.3 Signal Transmitting Power
The signal transmitting power can be changed from 2.4W to 10 W or vice versa by
changing the jumper connections (Jxx1 and Jxx2) on the CONT-A Board (01P5740).
Note: Increasing output power decreases the battery operating hour by 50%
approximately.
The factory setting of the Output Power is 2.4 W
Jumper Settings TX Freq.
Jxx1 Jxx2 Jxx3
Output Power
A-LA B-LB 2.4W 33kHz
A-HA B-HB
2
10 W
A-LA B-LB 2.4W 40kHz
A-HA B-HB
2
10 W
A-LA B-LB 2.4W 50kHz
A-HA B-HB
1
10 W
The jumper Jxx3 must be set according to the frequency.
Fig. 4.3 Location of Jumper Blocks