Read Sony HT-K250 / STR-VE250 Service Manual online
STR-VE250
12
12
3-5.
IC PIN FUNCTION DESCRIPTION
• IC203
MB90553ABPF-G-235-BND SYSTEM CONTROL (MAIN Board)
Pin No.
1
2 to 8
9, 10
11
12 to 17
18
19
20
21
22
23
24
25
26
27
28, 29
30
31
32, 33
34
35
36
37
38
39
40, 41
42
43
44
45, 46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
I/O
O
—
—
—
—
—
O
I
O
O
—
—
O
—
—
—
O
I
—
—
—
—
—
I
I
—
—
I
I
—
—
I
I
I
I
I
—
I
—
I
—
—
O
I
O
O
I
I
Pin Name
LED/DIM
P21 to P27
P30, P31
VSS
P32 to P37
P40
FALSH DATA OUT
COMOUT
FALSH DATA IN
COMIN
LCD DATA
LCD CLK
VCC
P37
LCD LATCH
P47
C
P50, P51
BUSYOUT
BUSYIN
P54, P55
AVCC
AVRH
AVRL
AVSS
KEY INPUT1
KEY INPUT2
P62, P63
VSS
JOGA
JOGB
P66, P67
P70
STOP
MD0
MD1
MD2
HST
P72
SIRCS
P74
POWER SW
P76
P77
TUNER CLK
TUNER DO
TUNER DATA
TUNER CE
TUNED
STEREO
Description
Backlight LED control signal output “H” : ON
General purpose I/O port Not used (ground)
General purpose I/O port Not used (ground)
Ground
General purpose I/O port Not used (ground)
General purpose I/O port Not used (ground)
UART serial data output to the subwoofer unit and flash programming port
UART serial data input from the subwoofer unit and flash programming port
Serial data output to the liquid crystal display (LCD201)
Clock output to the liquid crystal display (LCD201)
Power supply
General purpose I/O port Not used (open)
Latch signal output to the liquid crystal display (LCD201)
Not used (ground)
Capacitor connection terminal for regulating the power supply
Not used (ground)
Busy signal output to the subwoofer unit
Busy signal input from the subwoofer unit
Not used (ground)
A/D converter power supply
A/D converter external reference voltage source
A/D converter external reference voltage source
A/D converter power supply
Key signal input from the function switches (S207 to S209)
Key signal input from the function switches (S204 to S206)
General purpose I/O port Not used (ground)
Ground
Rotary encoder data input from the master volume (RV201)
Rotary encoder data input from the master volume (RV201)
General purpose I/O port Not used (ground)
General purpose I/O port Not used (ground)
AC OFF signal input “L” : AC OFF
Operation mode setting input (normally fixed at “H”)
Operation mode setting input (Vcc)
Operation mode setting input (normally fixed at “L”)
Hardware standby signal input (connected to RESET)
Not used (ground)
Remote control receiver data input from the IC201
Not used (ground)
Power key input
General purpose I/O port Not used (ground)
General purpose I/O port Not used (ground)
Serial data transfer clock output to the tuner
Serial data input from the tuner
Serial data output to the tuner
Chip enable signal output to the tuner
Tuning detection signal input from the tuner
Stereo tuning detection signal input from the tuner
Pin No.
65
66
67
68
69
70
71 to 74
75
76
77
78 to 80
81
82
83
84
85 to 92
93 to 100
I/O
O
O
O
O
O
—
—
O
—
I
—
—
—
—
—
—
—
Pin Name
TUNER MUTE
CTLA
CTLB
CTLC
CTLD
CTLE
P94 to P97
RST OUT
PA1
RESET
PA2 to PA3
VSS
X0
X1
VCC
P00 to P07
P10 to P17
Description
Muting signal output to the tuner
Analog input selection signal output
Analog input selection signal output
Digital input selection signal output
Digital input selection signal output
Not used (ground)
General purpose I/O port Not used (ground)
Subwoofer reset signal output “L” : reset
General purpose I/O port Not used (ground)
Reset signal input
General purpose I/O port Not used (ground)
Ground
Oscillation pin
Oscillation pin
Power supply
General purpose I/O port Not used (ground)
General purpose I/O port Not used (ground)
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