Furuno FCV-1200L Service Manual page 15

3.3.2 ES Board 02P6271
Figure 3.5 shows the block diagram of the ES board.
TP30
DIODE
Filter
TP39
TRAP
LPF
TP13
DIODE
Filter
TP12
TRAP
CR29 VTX-H
J4
TX AMP.
1
3
Q9 - Q16
J3
TX AMP.
1
3
Q1 - Q8
VTX-L
CR16
J1
JP1
TRXST1 L
13
TRXST2 L
JP2
14
J2
JP7 TRXST1 H
13
JP8 TRXST2 H
14
Frequency
Up to 200kHz 400kHz
JP1 short open
JP2 short short
JP7 short open
JP8 short short
The transmitting and receiving amplifier circuits are the same circuits for all frequencies between 15
and 200 kHz except 400 kHz. When the ES board is set to 400 kHz, the connector CN3 is marked
by "400 kHz"
Jumper settings, J1 and J7, depend on the frequency of the ES board and are detected by the CPU on
the MAIN board to generate the transmission signal and 1
signal from the connector J2 is displayed on the right side screen (H) and the signal from the J1 is
displayed on the left side screen (L) when the dual display mode is selected.
Jumpers, J2 and J8, are set depending on the presence of the ES board.
Transmitting
The transmission output voltage is determined by the VTX voltage which is controlled by the CPU
in accordance with the "SUPPLY VOLTAGE" set on the XDCR SETTING menu.
The maximum output power of the transmission circuit is 3 kW.
1st LOCAL H-H
TP40
TP31
X Filter
TP33
TP32
246 kHz
1st LOCAL H-C
1st LOCAL L-H
TP16
TP14
Filter
X
TP15 TP17
246 kHz
1st LOCAL L-C
TP48 TP50
TX0 L
U29
TP49
TP47
TX1 L
TP4
TP6
TX0 H
U1
TP5
TP1
TX1 H
TP25
12VP
TP2
TP24
V REF
12VA
TP3
5VA P
TP29
5VA M
Figure 3.5 Block diagram of ES board
TP45
TVG - H
TRX TVG H-H
TVG REG.
2nd LOCAL H-H
TP34
TP41
Amp.
Filter
X
TP35
246 kHz
V REF
2nd LOCAL H-C
TP7
TRX TVG L-H
TVG - L
TVG REG.
2nd LOCAL L-H
TP8
TP26
Amp. Filter
X
TP18
246 kHz
V REF
2nd LOCAL L-C
1st LOCAL H-H
1st LOCAL H-C
1st LOCAL L-H
1st LOCAL L-C
2nd LOCAL H-H
2nd LOCAL H-C
2nd LOCAL L-H
2nd LOCAL L-C
J1 J2
8
9
11
st
local carrier signals to the ES board. The
12
TP42 TP36
TRX SIG H-H
BPF
TP37
TP43
TRX SIG H-C
11 kHz
TP27
TP19
TRX SIG L-H
BPF
TP28
TP9
TRX SIG L-C
246 kHz
TP46
LOCAL 1-H
TP44
LOCAL 1-L
TP11
TP10
LOCAL 2-H
TP20
TP21
LOCAL 2-L
TP22
TP23
KP TX0 L
KP TX1 L
KP TX0 H
KP TX1 H
TRX TVG H-H
TRX TVG L-H
VTX-H
VTX-L
J2
17
18
J1
17
18
J2
4
J1
4
J2
6
J1
6
J1
1
2
J2
1
2
15
15
20
20