Furuno GP-90 - Page 6

1. Circuit Description
3
To LCD Unit
To LCD Unit
To PNL Unit
From Personal Computer, Beaco
n
Receiver
From Built-in Beacon Receiver
Program
ROM
(Flash ROM)
8 Mbit
U16
CR7
#26
#30,#41
#27
#31
MPU
TMP68301
#43
#50-52
DATA 1 DATA 3
#40 #41 #44
RS-232C (5 V),
RS-422 (0 V)
DATA 2
J3
MOB IN
RXD
TXD
U29 #18,U30 #4
#14 #11
CH A CH B
SIO
RS-232C(U29)
RS-422(U30)
Selector
U29,U30
U23
+
12 V
+5 V
-20.5 V
DATA 4
POWER
Address
G/A
ACRTC Controller, LCD I/F, KEY I/F
16 MHz
8 MHz
U15
RAM
2 Mbit
CG
ROM
4 Mbit
VIDEO
RAM
3 Mbit
6.2 MHz
Address Data
ACRTC
U5
Key Data Picture Data
←Lat/Long,SPD/CRS,Time Date,etc
+5 V
GPS INITIAL SETTING→
U12, U13 U21, U27 U14 U24
U25
U26
CFL Regulator
Contrast Adjuster.
#6
JP1
BT1
#3
BAT VOLT
Detector
U22
#2
VBAK
(
+3V
)
Tout1
Connected to temperature sensing resister(2.7 V at about 20°C)
Vo (-16 V to –20 V)
J4
J10
14
J9 J11
To GPS RECEIVER
2
1, 4
5
3, 4
1, 2 1, 2
3, 4
1 3 2 3 3 1
1, 2
Brilliance and Contrast Adjuster. (D/A CONV.)
U2
TXD
RXD
11 - 14
1 - 10
U3
Q6,Q7,T1,U1
J2
ON/OFF
Switching
Regulator
Controller
Switching
Regulator
Q16
U8
U38
TXD RXD
RXD
TXD
JP4, JP5
CONTACT
SIG. GEN
Fig.1.2 Block diagram of NP board