– 6 –
2-1.
IC PIN FUNCTION DESCRIPTION
•
MAIN BOARD IC501
µPD17707GC-528-3B9 (SYSTEM CONTROL)
SECTION 2
DIAGRAMS
1
NIL
–
Not used (Fixed at “L”)
2, 3
POS3, POS2
I
Tape position detection pin
4, 5
POS0, POS1
I
Tape position detection pin
6
TAPEON
O
Tape power supply control pin
7
CM_ON
O
Capstan motor control pin
8
LM_LOD
O
Loading motor control pin (loadig direction)
9
LM_EJ
O
Loading motor control pin (eject direction)
10
TUNON
O
Tuner power supply control pin
11
FM_ON
O
FM power supply control pin
12
PW_ON
O
System power supply control pin
13
MUTE
O
System muting control pin
At muting: “H”
14
VOLCE
O
Chip enable output pin to electrical volume
15
VOLCKO
O
Clock output pin to electrical volume
16
VOLSO
O
Data output pin to electrical volume
17
AMPON
O
Power amp power supply control pin
18
AMPMUT
O
Power amp muting control pin
At muting: “L”
19
DX_LO
O
DX/local selection control pin
20
NC1
–
Not used
21
G N D
–
G N D
22
DSTSEL
I
Destination setting pin (A/D input) (Fixed at “L”)
23
D_BASS
I
D-BASS switch input pin (A/D input)
24,25 KEYIN1,KEYIN0
I
Key input pin (A/D input)
26
RC_IN0
I
Rotary remote commander input pin (A/D input)
27
V S M
I
FM/AM signal meter voltage detection pin (A/D input)
28
AMIFIN
I
AM(MW,SW) IF input pin
29
FMIFIN
I
FM IF input pin
30
V D D
–
Power supply
31
FM_OSC
I
FM OSC signal input pin
32
AM_OSC
I
AM OSC signal input pin
33
G N D
–
G N D
34
NC2
–
Not used
35
EO1
O
Main charge-pump output pin
36
TEST0
I
Test pin
37
SECU-OUT
O
Not used
38
SEKOUT
O
SEEK control signal output pin
39
MW_SW
O
MW/SW power supply select pin
40
BEEP
O
Beep sound output pin
41
KEYACK
O
Key acknowledge signal input pin
42
BU_IN
I
Back up power supply detection pin
METAL control input/output pin
At initial mode: auto/manual selection input of METAL function
“L”: manual
43
MTLSEL
I/O
At manual mode: METAL on/off output
“H”: on
At auto mode: input at
%ª MTLIN
DOLBY control input/output pin
44
DOLON
I/O
At initial mode: valid/invalid selection input of DOLBY function
At normal mode: DOLBY on/off output
45
AMSIN
I
Tape music with/without detection pin
“L”: with music
46
ST
I/O
Stereo detection signal input and forced monaural signal output pin
Pin No.
Pin Name
I/O
Function
