Yamaha A-S3000, Service Manual

Page: 39 / 101

• Microprocessor extended port
IC402: LC709004AMJ-AH (FRONT (1) P.C.B.)
I/O-expander for microprocessor
C
ontr
ol logic
port 0 I/O buffer
Serial/parallel converter/shift register
I/O control/output register
DIN
VDD
DOUT
VSS
CLK#
CS#
RES#
P00 P07
2
1
5
7
3
4
6
24 17
VDDP1
16
port 1 I/O buffer
P1
0
P1
7
15 8
Pin
No.
Port Name
Function Name
(P.C.B.)
I/O Detail of Function
1 DOUT DOUT SO Data Out
2 DIN DIN SI Data In
3 CLK# CLK SI Clock
4 CS# CS I Chip Select
5 VDD VDD Power supply
6 RES# RES I Initial Clear
7 VSS VSS GND
8 P17 NC
9 P16 MTR MT O H/HiZ: OFF, L: ON (Mute)
10 P15 COLOR I Color of main unit: H: BL, L: SI
11 P14 MTR_ATT O H/HiZ: OFF, L: ON (ATT.)
L (ON) when without HP, H (OFF) with HP inserted
12 P13 PK/N_VU O H: Peak mode, L: VU mode
13 P12 MTR_OFF O / HiZ High/Open becomes Mute off by using Mute/Low
14 P11 RY_HP O On when Headphone is detected
15 P10 LED_MT HiZ
LED is turned on when Mute lever on the front and Mute key of remote controller are
activated
16 VDDP1 VDDP1 +5S power supply
17 P07 LED_MDIR HiZ LED tuned on when INPUT MAIN DIRECT is selected
18 P06 LED_PHONO HiZ LED turned on when INPUT PHONO is selected
19 P05 LED_BAL2 HiZ LED turned on when INPUT BAL 2 is selected
20 P04 LED_BAL1 HiZ LED turned on when INPUT BAL 1 is selected
21 P03 LED_LINE2 HiZ LED turned on when INPUT LINE 2 is selected
22 P02 LED_LINE1 HiZ LED turned on when INPUT LINE 1 is selected
23 P01 LED_TU HiZ LED turned on when INPUT TUNER is selected
24 P00 LED_CD HiZ LED turned on when INPUT CD is selected
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A-S3000
A
-S30
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0