JRC JFV-130HP Series, Installation Manual

Page: 31 / 60

30
JP2 and JP3 setup
×＝
Not a jumper switch,
○＝
A jumper switch
High frequency JP2 Low frequency JP3
Polarity of sig-
nal
1 - 2 3 - 4 5 - 6 1 - 2 3 - 4 5 - 6
+signal
× ○ ○ × ○ ○
−
signal
○ × × ○ × ×
After setting up the jumper switches, select “ON” for the S.Split display from the “Fish
Finding Menu”. For the procedure, see page 36 in the Instruction Manual.
Adjust the reception signal according to the following procedure:
1. After the jumper switch setup is complete, adjust RV1, RV2, RV3 and RV4.
2. When adjusting the high frequency, connect the oscilloscope to TP2, then using RV3,
adjust its level at no signal state to 0.3V. Connect GND to TP101.
3. Using RV1, adjust level of transmission wave to 3.6V.
4. Repeat the above steps 2 and 3.
5. When adjusting the low frequency, connect the oscilloscope to TP1, then using VR4,
adjust its level at no signal state to 0.3V. Connect GND to TP101.
6. Using RV2, adjust level of the transmission wave to 3.6V.
7. Repeat the above steps 5 and 6.
When you cannot properly display the transferred image, polarity of the fish
finding signal is most probably reversed. Change polarity of JP2 and JP3.
For the entire view of the CML-478A, refer to Figure 2.5 in page 32.