Furuno FS-1570 Service Manual page 121

Board Type
TX FIL 05P0736
SW REG 05P0737
RELAY 05P0744
T-IF 05P0731
MB 05P0742 Mother board
DRV 05P0738
PA 05P0739
COMB 05P0740
W/R2 05P0734
MB 05P0743 Mother board
1) Consisting of 7 band pass filters.
2) The filter eliminates and suppresses unwanted
signal generated at PA.
Check signal output to T-CPU: IN-Vr/Vf, OUT-Vr/Vf
and ALC
Input voltage: 24 VDC
Output voltage: +15 VDC (5 A max)
Switching frequency: 220 kHz.
Consisting of;
1) On/Off relay in 24 V lines for PA1 and PA2
2) 25 A breakers in 24 V lines for PA1 and PA2
3) +12 V AVR
4) 16 V lowvoltage protector
5) 35 V overvoltage protector
Consisting of;
1) Connectors and terminal board for external
equipment
2) Amplifiers for LINE IN and LINE OUT signals.
2 stage push-pull amplifier; output power: 30 W;
power gain: 20 dB.
Check signal output to T-CPU: TEMP
Single stage push-pull amplifier; output power: 125
W; Power gain: 10 dB
Check signal output to T-CPU: TEMP, VC and IC
Mixes outputs of PA-1 and PA-2 to obtain 250W.
Check signal output to T-CPU: COMB CHK
DSC general frequency receiver, identical to W/R1.
T-CPU recognizes W/R2 by INST2 signal.
T-CPU sends frequency data to be scanned to TX/RX
board at the absence of INST2 signal.
5-4
Function
5.1 Configuration
Remarks
FS-1570T/
2570T
FS-1570T
FS-2570T