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SECTION 6
DIAGRAMS
6-1.
IC PIN FUNCTION DESCRIPTION
•
MAIN BOARD IC501
µ
PD17708GC-567-3B9 (SYSTEM CONTROLLER)
Pin No.
Pin Name
I/O
Function
1
AMSSEL
I
Setting terminal for the AMS selection fixed at “L”
2
POS3
I
3
POS2
I
4
POS0
I
5
POS1
I
6
TAPEON
O
Tape system power supply on/off control signal output terminal “H”: tape on
7
CM ON
O
Capstan/reel motor (M901) drive signal output terminal “H”: motor on
8
LM LOD
O
Loading/tape operation motor control signal output to the LB1638M (IC351)
(For the loading direction and forward side operation) *1
(For the loading direction and forward side operation) *1
9
LM EJ
O
Loading/tape operation motor control signal output to the LB1638M (IC351)
(For the eject direction and reverse side operation) *1
(For the eject direction and reverse side operation) *1
10
TUNON
O
Tuner system power supply on/off control signal output to the BA3918 (IC611) “H”: tuner on
11
FM ON
O
FM system power supply on/off control signal output to the BA3918 (IC611) “H”: FM on
12
PW ON
O
Main system power supply on/off control signal output to the BA3918 (IC611) “H”: power on
13
MUT
O
Line muting control signal output terminal “H”: line muting on
14
VOLCE
O
Chip enable signal output to the electrical volume (IC331)
15
VOLCKO
O
Serial data transfer clock signal output to the electrical volume (IC331)
16
VOLSO
O
Serial data output to the electrical volume (IC331)
17
AMPON
O
Standby control signal output to the power amplifier (IC751) “L”: standby
18
AMPMUT
O
Muting control signal output to the power amplifier (IC751) “L”: muting on
19
DX/LO
O
Local/DX selection signal output to the FM/AM tuner unit (TU1) “L”: DX, “H”: local
20
AM MONO
O
AM forced monaural signal output terminal Not used (open)
21
GND
—
Ground terminal
22
DSTSEL
I
Destination setting terminal (frequency select switch (S502) input terminal)
“L”: AM 9k step or FM 50k step, “H”: AM 10k step or FM 200k step
“L”: AM 9k step or FM 50k step, “H”: AM 10k step or FM 200k step
23
DBASIN
I
D-BASS switch (SW951) input (A/D input)
24
KEYIN1
I
Key input terminal (A/D input)
6, INTRO 1, REPEAT 2, SHUF 3, BL SKIP 6, ATA 5, 4, PRESET DISC +/– keys input
(LSW921 to LSW927, LSW929 and LSW930)
6, INTRO 1, REPEAT 2, SHUF 3, BL SKIP 6, ATA 5, 4, PRESET DISC +/– keys input
(LSW921 to LSW927, LSW929 and LSW930)
25
KEYIN0
I
Key input terminal (A/D input)
OFF, SOURCE, MODE
OFF, SOURCE, MODE
*, + ) + SEEK AMS, – = 0 SEEK AMS, VOLUME –,
SEL, VOLUME +, ATT , DSPL, BTM, LCL keys input (LSW901 to LSW912)
26
RC IN0
I
Rotary remote commander shift key A/D input terminal
27
VSM
I
FM and AM signal meter voltage detection input from the FM/AM tuner unit (TU1)
28
AMIFIN
I
AM intermediate frequency detection signal input from the FM/AM tuner unit (TU1)
29
FMIFIN
I
FM intermediate frequency detection signal input from the FM/AM tuner unit (TU1)
30
VDD2
—
Power supply terminal (+5V)
31
FM OSC
I
FM local oscillator detection signal input from the FM/AM tuner unit (TU1)
32
AM OSC
I
AM local oscillator detection signal input from the FM/AM tuner unit (TU1)
33
GND
—
Ground terminal
34
NCO
O
Not used (open)
35
EO1
O
Main charge-pump control signal output terminal
36
TEST0
I
Setting terminal for the test (fixed at “L”)
37
NCO
O
Not used (open)
38
SEKOUT
O
Seek control signal output to the FM/AM tuner unit (TU1)
39
MW/SW
O
MW/SW selection signal output to the FM/AM tuner unit (TU1) “L”: MW, “H”: SW
40
BEEP
O
Beep sound output terminal
Tape position detect input from tape operation switch on the mechanism block
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