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SECTION 5
DIAGRAMS
5-1.
BLOCK DIAGRAM
ANT1
(ANTENNA)
462MHz to 468MHz
RF
LOW PASS
SWITCH
B.P.F.
IN
1st
RF AMP
1
FILTER
D1 – 3
BPF1
Q1
MIX
462.5625MHz to 467.7125MHz
LOCAL
OSC
3
TX POWER AMP
RF AMP
Q6
Q4, 5
LCD1 – LCD17
76 – 80, 1 – 12
58
59
55
56
X101
X102
4.194304MHz
32.768kHz
• SIGNAL PATH
: RF (RX)
: RF (TX)
: AF (RX)
: AF (TX)
05
– 9 –
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CF2
450kHz
2nd MIX, 3rd IF AMP, DET
IC2
XF1
IF
MIX
MIX
CF1
IF
21.7MHz
1st IF
OUT
2nd IF AMP
IN
2nd
OUT
450kHz
IN
3rd IF
6
16
3
5
AMP
Q2
MIX
AMP
LOCAL
OSC
1st MIX,
1st IF AMP
IC1
1
13
RIPPLE FILTER
PLL B+
Q7
D901
BUFFER
VCO BUFFER
+
Q3
Q901
L.P.F.
X1
XIN
21.25MHz
DO
CHARGE
OSC
PHASE
2
5
PUMP
COMPARATOR
CIRCUIT
LD
LOCK
XOUT
14
1
DET
PROGRAMMABLE
DIVIDER/COUNTER
FIN
8
PRESCALER
SHIFT
C53
REGISTER &
LATCH
PLL REFERENCE
FREQUENCY
PLL FREQUENCY
SYNTHESIZER
IC3
11 9 10
43
60
45
LCD18, LCD19
21, 22
38
40
44
46
50
LIQUID CRYSTAL DISPLAY
CPU B+
LCD101
S101
S102
S104
S106
S105
(CH/GROUP)
POWER
S103
+
–
MODE
CH
LIGHT/BATT
H
GROUP
10
CTCSS ENCODER/DECODER
RV104
IC109
TONE
AF
MODULATION
RX
QUADRATURE
OUT
AUDIO IN
L.P.F.
9
23
DET
AUDIO
TX
FILTER
AUDIO OUT
FIL IN
20
NOISE
FILTER/
8
DET
NOISE AMP
RV102
RV104
TONE
TONE IN/
IN
SQUELCH
24
DECODE
FILTER
TX TONE
OUT
16
TONE
OUT
FILTER
DIGITAL INTERFACE
CLOCK
GENERATOR
2
3
X103
1MHz
SYSTEM CONTROLLER
IC101
47
63
B+ SWITCH
TX SYSTEM B+
Q123 – 125
7
COMPARATOR
IC103 (1/2)
– 10 –
RV106
VOL
RX AUDIO OUT
19
TX AUDIO IN
22
MUTING
Q108, 110
TONE
TONE DETECT
WAVE
MUTING CONTROL
DECODE
AMP
SHAPER
D102
TONE
OUT
Q101
Q102, 103
DECODE
15
LOGIC
14
BUFFER
AF AMP
+
IC106 (1/2)
IC106 (2/2)
RV103
MODULATION
SENSITIVITY
TX MUTE
SWITCH
Q117
7
8 4
13
64
52
42
36
53
31
32
34
68
37
66
67
61 62 13
1
COMPARATOR
IC103 (2/2)
BATTERY CHECK
Q114
RESET SIGNAL
GENERATOR
IC104
CPU B+
SYSTEM CONTROLLER (IC101) B+
POWER AMP (IC102) B+
CTCSS ENCODER/
PLL B+
DECODER (IC109) B+
TX
SYSTEM B+
B+ SWITCH
AUDIO CIRCUIT B+
Q126
6
5
B+ SWITCH
B+ SWITCH
RX SYSTEM B+
Q122
Q121
AUDIO
CIRCUIT B+
RV107
TX POWER
ICB-U655
AF POWER AMP
J101
IC102
SP @
SP101
(SPEAKER)
SWITCH
Q112
B+
BATT B+
SWITCH
Q119
J102
MIC
TONE OUT
S107
DETECT SWITCH
TALK
Q115, 116
MIC101
MIC AMP
Q118
MIC
39
35 51
29
BATT B+
VOLTAGE DETECT
D106
IC105
(LCD BACK LIGHT)
Q120
3
LED DRIVE
2
2.9V
J103
DC IN 4.5V
–
+
D104
+3V REGULATOR
IC110
B+ SWITCH
Q113
DRY BATTERY
SIZE "AA"
(IEC DESIGNATION R6)
3PCS. 4.5V
+2.9V REGULATOR
IC111
+2.9V REGULATOR
IC107
B+
(2.9V)
– 11 –
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