Read Sony XR-2800 / XR-2803 Service Manual online
– 31 –
6-5.
IC PIN FUNCTION DESCRIPTION
•
MAIN BOARD IC501
µ
PD17707GC-529-3B9 (SYSTEM CONTROLLER)
Pin No.
Pin Name
I/O
Function
1
ILLIN
I
Not used (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 MM1322XFBE (IC361)
(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 MM1322XFBE (IC361)
(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 (IC601) “H”: tuner on
11
FM ON
O
FM system power supply on/off control signal output to the BA3918 (IC601) “H”: FM on
12
PW ON
O
Main system power supply on/off control signal output to the BA3918 (IC601) “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 (IC401)
15
VOLCKO
O
Serial data transfer clock signal output to the electrical volume (IC401)
16
VOLSO
O
Serial data output to the electrical volume (IC401)
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 (XR-2800: fixed at “L”, XR-2803: fixed at center voltage)
23
D-BASS
I
D-BASS switch (SW970) input (A/D input)
24
KEYIN1
I
Key input terminal (A/D input)
6, INTRO 1, REPEAT 2, 3, BL SKIP 6, ATA 5, METAL 4 keys input (LSW921 to LSW927)
6, INTRO 1, REPEAT 2, 3, BL SKIP 6, ATA 5, METAL 4 keys input (LSW921 to LSW927)
25
KEYIN0
I
26
RC IN0
I
Rotary remote commander shift key A/D input terminal
27
VSM
I
FM and AM (MW/LW) signal meter voltage detection input from the FM/AM tuner unit (TU1)
28
AMIFIN
I
AM (MW/LW) 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 (MW/LW) local oscillator detection signal input from the FM/AM tuner unit (TU1)
33
GND
—
Ground terminal
34
N.C.
—
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
N.C.
O
Not used (open)
38
SEKOUT
O
Seek control signal output to the FM/AM tuner unit (TU1)
39
N.C.
O
Not used (open)
40
BEEP
O
Beep sound output terminal
41
KEYACK
I
Input of acknowledge signal for the key entry Acknowledge signal is input to accept function
and eject keys in the power off status On at input of “L”
and eject keys in the power off status On at input of “L”
Tape position detect input from tape operation switch on the mechanism block
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)
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