Furuno FS-1570 - Page 47

2.5 Antenna coupler
2-22
Fig.2.5.3 AT-1560-15/25 with dummy board removed
T1: VSWR detector
T2: Phase detector
TB3: Terminal
1. I ANT 5. DUMMY
2. TUNE OK 6. +15 V
3. THROUGH 7. 0 V
4. TUNE
S2: DIP SW
U1: HD6475328CP
(H8 MPU)
S3: TUNE SW
(ON: For auto tuning)
R63: Ia ADJ.
LED for CPU RUN
(
Blinkin
g
normall
y)
TUNE LED lights during
tuning
THROUH LED lights when
matching circuit is bypassed.
“Dummy ON/OFF” LED lights when
dummy is connected.
S2-#2: ON
S3 (TUNE SW) ON:
For self test
S1 [AUTO/MANUAL]
Tuning mode selector
S4, S5 and S6: DIP SW
used to adjust 2182 kHz
with S1 set to MANUAL.