Read Sony XR-1100 (serv.man2) Service Manual online
21
5-7.
IC PIN FUNCTION DESCRIPTION
•
MAIN BOARD IC1 LC72322N-9914 (SYSTEM CONTROLLER)
Pin No.
Pin Name
I/O
Description
1
XIN
I
System clock input terminal (4.5 MHz)
2
TEST2
I
Connected to ground
3, 4
NC
I
Not used (fixed at “L”)
5
SD
I
Station detector detect input from the FM/AM tuner unit (TU100)
Stop level for SEEK, A MEM, etc. is determined SD is present at input of “H”
Stop level for SEEK, A MEM, etc. is determined SD is present at input of “H”
6
STEREO
I
Stereo detection signal input from the FM/AM tuner unit (TU100) (Commonly used for stereo
display input) FM stereo detection at input of “L”
display input) FM stereo detection at input of “L”
7 to 10
NC
O
Not used (open)
11
BEEP
O
Beep sound signal output to the power amp (IC500) “H” active
12
MUTE-REQ
I
Muting request signal input terminal (“H” active) “L”: accessory on, “H”: accessory off
13
ILL-ON
O
Power on/off control signal output for the liquid crystal display driver (IC900), illumination lamp
and back light lamp “H”: power on
and back light lamp “H”: power on
14
N/R
I
Tape direction switch (S901) input terminal “L”: reverse side, “H”: forward side
15
TAPE-IN
I
Tape in detection switch (S903) input terminal “L”: tape in
16
FF-REW
I
17
K1
I
Key matrix return signal input terminal Not used (fixed at “L”)
18
K0
I
Key matrix return signal input terminal (Connected to T2 (pin eh))
19
MOTOR
O
Capstan/reel motor (M901) drive signal output “H”: motor on
20
SEEK
O
Seek control signal output to the FM/AM tuner unit (TU100) “H” active
21
NC
O
Not used (open)
22
LOCAL/DX
O
Local/DX selection signal output to the FM/AM tuner unit (TU100) “L”: DX, “H”: local
23 to 27
KS0 to KS4
O
Key matrix scan signal output terminal
28
LCD-CLK
O
Serial data transfer clock signal output to the liquid crystal display driver (IC900)
29
LCD-CE
O
Chip enable signal output to the liquid crystal display driver (IC900) “H” active
30
LCD-DATA
O
Serial data output to the liquid crystal display driver (IC900) “H” active
31
VDD
—
Power supply terminal (+5V)
32 to 34
KIN0 to KIN2
I
Key matrix input terminal
35
BAND-KEY
I
TUNER A MEM switch (S900, 901) input terminal “L” is input when pressing the switch
36
T2
O
Key matrix scan signal output terminal (Connected to K0 (pin qk))
37, 38
T1, T0
O
Key matrix scan signal output terminal Not used (open)
39, 40
NC
O
Not used (open)
41
MUTE
O
Audio muting on/off control signal output terminal “H”: muting on
42
NC
O
Not used (open)
43
AMP-MUTE
O
Amp muting on/off control signal output to the power amp (IC500) “L”: muting on
44
ANT-REM
O
Control signal output for the external power antenna and external amp “H” active
45 to 48
NC
O
Not used (open)
49
VOL-CE
O
Chip enable signal output to the electrical volume (IC400) “H” active
50
VOL-DI
O
Serial data output to the electrical volume (IC400) “H” active
51
VOL-CL
O
Serial data transfer clock signal output to the electrical volume (IC400)
52 to 54
NC
O
Not used (open)
55
POWER-ON
O
Power on/off control signal output terminal “H”: power on
56
AM-ON
O
AM system power supply on/off control signal output terminal “H”: AM on
57 to 60
NC
O
Not used (open)
FF/REW detection switch (S902) input terminal “L”: FF/REW mode
At this time, the current display such as run display will blinking at every 1Hz.
When the ATA function is ON, entering “L” in the tape mode causes the mode to be changed
over to the radio monitor mode
At this time, the current display such as run display will blinking at every 1Hz.
When the ATA function is ON, entering “L” in the tape mode causes the mode to be changed
over to the radio monitor mode
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