Read Sony MHC-W77AV / STR-W77 Service Manual online
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SECTION 4
EXPLANATION OF IC TERMINALS
IC501 ASD0205GF-015-3BA (SYSTEM CONTOROL)
1
VDD
–
Power supply.
2
CLK OUT
O
Direct output for communications with HCD-W55.
3
RDY IN
I/O
Direct input / output for communications with HCD-W55.
4
POWER ON / OFF
O
L : Relay ON
5
MUTE
O
Mute output to transistor. L : Mute ON
6
PROLOGIC LATCH
O
Latch output to IC3001 (LA2785).
7
VOL. LATCH
O
Latch output to IC2002 (TC9210P).
8
427LAT
O
Latch output to IC105 (M62427FP).
9
LED LAT
O
Latch output to IC504 (M66313FP-200C).
10
RESET
I
Reset terminal.
11
X2
–
Oscillator connection terminal. (5MHz)
12
X1
–
Oscillator connection terminal. (5MHz)
13
IC
–
Ground connection.
14
XT2
–
Oscillator connection terminal. (32MHz)
15
XT1
–
Oscillator connection terminal. (32MHz)
16
VDD
–
Power supply.
17
BACK UP
I
AC Power supply OFF.
18
COM CLK
O
Transfer clock output serial data.
19
COM DATA
O
Serial data output.
20
ST DATA IN
I
Serial data input from IC 1.
21
ST CE
O
Chip enable output to IC 1.
22
STEREO
I
Stereo signal input.
23
TUNED
I
Tuned signal input.
24
AUB OUT
O
Audio bus output.
25
AVSS
–
Ground.
26
PROLOGIC. RY
O
Rear and center speaker relay ON/OFF control.
27
SUFFIX
I
Input for model select.
28
SPE
I
Spectrum analyzer signal input.
29
SPE
I
Spectrum analyzer signal input.
30
SPE
I
Spectrum analyzer signal input.
31
SPE
I
Spectrum analyzer signal input.
32
KYE 1
I
Key data input (A/D converter).
33
KYE 2
I
Key data input (A/D converter).
34
AVDD
–
Power supply for anlog.
35
AV REF
–
Reference voltage for A/D converter.
Pin No.
Pin name
I/O
Description
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