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• IC Block Diagrams – MAIN BOARD –
IC61 HA12181FP-EL
16
IF AGC
IF
LPF
DETECTOR
AMP
PULSE
DETECTOR
SW1
REFERENCE
VOLTAGE
CIRCUIT
1
2
3
IC91 BU2624FV-E2
REFERENCE
XIN
1
DIVIDER
CE
2
I/O
CK
4
SHIFT REGISTER LATCH
CTL
DA
5
CD
6
P0
7
9
P1
10
P3
15
AF
HPF1
LPF
AMP
REFERENCE
CURRENT
CIRCUIT
HIGH PASS AMP
PHASE
SW2
(WAVEFORM COMP.)
CURRENT
LEVEL
DIFFERENCE
SW3
DETECTION
4
5
PHASE
DET
MAIN
PRESCALER
COUNT
IF COUNT
CTL
20BIT COUNT
14
13
12
VCC
OR
PULSE
AF
NOISE
DETECT
AGC
AGC
1
HPF
PULSE
DETECT
2
GATE PULSE 1
SW4
REFERENCE
CURRENT CIRCUIT
(WAVEFORM COMP.)
GND
6 7 8
IC201 LB1638M
GND
20
XOUT
19
VSS
18
PD
17
VDD
FMIN
16
AMIN
15
GND
P2
14
13
IFIN
12
SD
11
P4
– 37 –
11
10 9
GATE PULSE
GENERATOR
GATE PULSE 2
BUFFER
AMP
SW5
1
2
IN1
VCC
3
IN2
4
5
10
N.C.
9
OUT1
8
VS
7
OUT2
6
N.C.
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