Furuno FM-8800D Service Manual page 142

5.4.3 TX/RX (05P0774)
CH70 RX out
J5
ANT
J3
DUP IN2
J4
DUP IN1
J2
DUP OUT
CM Coupler
U2
T/R
(DCS3D2D)
SW
J1
Jumper:
SIMP only
T+15V
F-VSWR DET
CR8
U3(1/2)
R-VSWR DET
CR6
U3(2/2)
TX/RX
05P0774A (For FM-8800S)
05P0774B (For FM-8800D)
CR9
RF AMP
MIX
ATT
(2SC3356)
BPF(L/C) BPF(L/C)
Q7
TP1
Rx Local
(F0+51.2375MHz)
PA
DRIVE BPF(L/C)
(RA35H1516M)
Q1
U1 Q5
PWR
BIAS
CONT
UN LOCK T+15V
TEST ON
Q2,10,102
Q3,4,9,8,11 T15V, +15V
U4
U4
(2/2)
(1/2)
R52
CR103
TEST ON
PWR CONT
F VSWR
R VSWR
Q112, 113
AGC CONT
(Not used)
CR13
FL2
MIX
CR104 ( 51.2375MHz)
CR106
Q6 Q111
TP4
R+15V
2nd Lo
(51.2MHz)
FL1: 45MHz
45 MHz
U5
MIX
CR101
F0
Q101 SW
U8
Q13
Tx Local
BPF(L/C)
uPC2745TB
(F0+45MHz)
2SC3356
T15V
R15V
TP3
T+15V
R+15V
+15V
+5V
TEMP. Sensor
Fig. 5.4.5 TX/RX (05P0774) Block Diagram
5-10
5.4 Block Description
J9-#25 AGC CONT
RX IF OUT(37.5kHz)
J9-#27
Q114
Q20
J7
45 MHz 45 MHz
U10
(Modulated)
X2
J8
25.6MHz
U11
TC75HU04F
+8V REG
VCO
Q14, Q116
CR11,12
2SC3356
1SV229
TP2
LPF
Q15
PLL1 DATA
51.2MHz
PLL
J9-#17-19 (STB/DATA/CLK)
U12
PLL1 UN-LOCK
J9-#21
(LMX2353TMX)
Q21
TEST ON
J9-#24
J9-#10 PWR CONT
J9-#12 F VSWR
J9-#13 R VSWR
J9-#23 RX ON
Q12, 17
J9-#22 TX ON
Q16, 18
J9-#1-4 +15V
J9-#9 +5V
PA TEMP
J9-#15
U13
(LM60CIM3)
U17
CODEC
U20
DSP
U25
DDS
Ref. OSC
CPU
05P0773
U30
CPU