— 13 —
— 14 —
3-6. IC BLOCK DIAGRAMS
• Main section
IC701
µ
PC1237HA
1
2
3
4
5
6
7
8
OVER LOAD DET
F/F
OFFSET DET
LATCH/
AUTORESET
V
CC
ON
MUTE
AC OFF
DET
V
CC
• Panel section
IC902 X24C01
IC904 BA6208
8
VCC
7
TEST INPUT
6
SCL
5
SDA
1
NC
2
NC
3
NC
4
VSS
START
STOP
LOGIC
CONTROL
LOGIC
START CYCLE
H.V. GENERATION
TIMING
& CONTROL
E PROM
32 x 32
2
32
XDEC
INC
LOAD
5
R/W
PIN
2
8
D
OUT
CK
32
WORD
ADDRESS
COUNTER
YDEC
D
OUT
ACK
DATA REGISTER
1
2
3
4
5
6
7
8
9
NC
OUTPUT 2
Vcc
GND
NC
INPUT 2
INPUT 1
NC
MOTOR
DRIVE
MOTOR
DRIVE
REG
SWITCH
SWITCH
OUTPUT1
Clock
Data
Down
Up
CD input relay signal output
Mute Control signal output when switching (Mute: H)
AUX input relay signal output
Connected to ground
TAPE input relay signal output
MD input relay signal output
Relativity position detection signal of rotary switch
(One of them terminal: L, the other terminal: H)
Function LED drive signal (ON: L)
Ground
Not used
Function LED drive signal (ON: L)
Not used
Test terminal (Not used)
Oscillation signal 8MHz
Reset signal (Reset: L)
Cancellation of hold mode signal (Start: H)
TUNER input relay signal output
PHONO input relay signal output
SIRCS signal (Active: L)
Not used
Power supply (+5V)
Pin No.
Pin Name
I/O
Function
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25 to 29
30
31
32
33
34
35
36
37
38 to 41
42
RCL
RDT
VDW
VUP
CD
MUT
AUX
T3
T2
T1
0
1
2
3
4
5
PHONO
TUNER
CD
AUX
GND
T2
T1
TEST
XIN
XOUT
RESET
HOLD
TUNER
PHONO
SIRCS
+5V
O
I/O
O
O
O
O
O
I
O
O
I
I
I
I
I
I
O
O
O
O
–
–
O
O
–
I
I
O
I
I
O
O
I
–
–
3-7. IC PIN FUNCTION
• IC901 TMP47C200BN-H371 (INPUT CONTROL, LED DRIVE)
Serial data of EEPROM (X24C01)
VR motor control signal (Active: H, Stop: L-L, Brake: H-H)
