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3-6. IC BLOCK DIAGRAMS
• Main section
IC701
PC1237HA
OVER LOAD DET
F/F
OFFSET DET
LATCH/
AUTORESET
AC OFF
DET
1
2
3
4
5
6
• Panel section
IC902 X24C01
VCC
TEST INPUT
SCL
SDA
8
7
6
5
START CYCLE
H.V. GENERATION
TIMING
START
& CONTROL
STOP
LOGIC
CONTROL
LOGIC
E PROM
2
XDEC
32
32 x 32
LOAD
INC
WORD
ADDRESS
COUNTER
32
5
2
R/W
YDEC
8
CK
D
PIN
DATA REGISTER
D
OUT
ACK
1
2
3
4
NC
NC
NC
VSS
IC904 BA6208
MOTOR
SWITCH
DRIVE
MOTOR
SWITCH
DRIVE
REG
1
2
3
4
5
6
7
8
V
ON
CC
MUTE
V
CC
7
8
OUT
9
— 13 —
3-7. IC PIN FUNCTION
• IC901 TMP47C200BN-H371 (INPUT CONTROL, LED DRIVE)
Pin No.
Pin Name
I/O
1
RCL
O
Clock
Serial data of EEPROM (X24C01)
2
RDT
I/O
Data
3
VDW
O
Down
VR motor control signal (Active: H, Stop: L-L, Brake: H-H)
4
VUP
O
Up
5
CD
O
CD input relay signal output
6
MUT
O
Mute Control signal output when switching (Mute: H)
7
AUX
O
AUX input relay signal output
8
T3
I
Connected to ground
9
T2
O
TAPE input relay signal output
10
T1
O
MD input relay signal output
11
0
I
12
1
I
13
2
I
Relativity position detection signal of rotary switch
14
3
I
(One of them terminal: L, the other terminal: H)
15
4
I
16
5
I
17
PHONO
O
18
TUNER
O
Function LED drive signal (ON: L)
19
CD
O
20
AUX
O
21
GND
–
Ground
22
–
Not used
23
T2
O
Function LED drive signal (ON: L)
24
T1
O
25 to 29
–
Not used
30
TEST
I
Test terminal (Not used)
31
XIN
I
Oscillation signal 8MHz
32
XOUT
O
33
RESET
I
Reset signal (Reset: L)
34
HOLD
I
Cancellation of hold mode signal (Start: H)
35
TUNER
O
TUNER input relay signal output
36
PHONO
O
PHONO input relay signal output
37
SIRCS
I
SIRCS signal (Active: L)
38 to 41
–
Not used
42
+5V
–
Power supply (+5V)
Function
— 14 —
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