Furuno FM-8800D Service Manual page 150

5.4.5 CPU (05P0773)
25.6MHz
TCXO
U37
Y1:
25.6 MHz
J13
U37
J3
U37
J11
Divider
Q10 U37
U33
1/2 x3
CH70 RX
05P0775
CH70 TEST
J1
CH70 IF OUT(37.5kHz)
AGC CONT
TX/RX IF OUT
+1.9V
+1.9V AVR
For
U23, Q8,
- DSP
CR16
+5V
+3.3V
+3.3V AVR
For
- CPU U28
- Logic ICs
+3.3V1
+3.3V AVR
For
U27
- D-RAM
- EEPROM
U37
For CLK
- CPU
- DSP
- DDS
- CODEC
DSP CLK
38.4MHz
U18
SEL
U11
U22
BPF
DDS
U43
U25
(AD9834BRU)
45MHz
(Modulated)
POW. CONT.
TX ON
RX ON
J7
TEST ON
TX/RX
05P0774
25.6MHz
R. VSWR
F. VSWR
J8
PLL DATA
DUP RX
PLL STB2
IF OUT
PLL CLK
DUP RX
05P0777
25.6MHz
PLL2 UNLOCK
J2
DUP INST
+15V
PWR
+5V AVR
05P0776
U25
+15V
Fig. 5.4.13 CPU Block Diagram
U16
LPF
U5
LPF
U16
LPF
U9
LPF
EEPROM
U29
(AT26BV256)
D-RAM
U31
(IC41LV16100S)
KEY ALM
SYNC
Timing SCLKD
BIT CLK
U39, 40
Loop
back
Parallel
to
Serial
U21,24
DSP CLK
38.4MHz
CR6
PLL DATA CHECK
PLL STB1
PLL CLK
PA TEMP
PLL1 UNLOCK
RX ON
SCLK
SIO
RTC
CE
05P0804
PWR SW
Note;
RTC board is installed in the Russian Ver.,
5-18
5.4 Block Description
+5V
J5
U42
HANDSET MIC
Handset SP
U6
U5
SP Connector
U12
TDA2003
SP
T1
U4
Q2
U15,14
TXD/RXD
NMEA
I/F
U13
DATA A/B
RS-485
I/F
Wing handset MIC1, 2 PTT
U1, 2, 3, 8
CENTRONICS
I/F
RESET
U34
U36
(S1D13704F00A)
LCD
CONT
U36
LED BRGT
VADJ
PWR SW
CH1
CH
CH2
Enter
Handset Hook SW
Handset PTT
Handset MIC
Handset SP
Wing
Handset MIC
Remote
Line IN
Wing SP1
Wing SP2
Remote
Line OUT
EXT SP
VDR AF
EXT Alarm
IEC61162-1
(NMEA)
DATA A/B
Wing Handset
MIC1, 2 PTT
Printer
KEY
PANNEL
05P0772
LCD
(EW50343FLWP)
Alarm
SQ VR
SQ Auto
AF Vol
POW
nob
Push to
Enter
HANDSET
&
HANGER