Sony CDX-4000RV Service Manual page 19

• IC501 MB90574BPMT-G-266-BND (SYSTEM CONTROL) (MAIN BOARD)
Pin No. Pin Name
1 TUNON
2 —
3 BUSON
4 – 6 —
7 ILLON
8 VCC
9 E2P SIO
10 E2P CKO
11 SYSRST
12 DOORSW (WRITE OUT)
13 LCDSO (WRITE IN)
14 LCDCKO
15 LCDCE
16 BEEP
17 UNISI
18 UNISO
19 UNICKO
20 UNICKI
21 CD MD
22 FLASHW
23 —
24 SIRCS
25 – 28 —
29 DOORIND
30 IFWIDTH
31 —
32 NS MASK
33 VSS
34 C
35 AD ON
36, 37 REIN0, 1
38 DVCC
39 DVSS
40, 41 —
42 AVCC
43 AVRH
44 AVRL
45 AVSS
46, 47 KEYIN0, 1
48 RCIN0
49 DSTSEL
50 QUALITY
51 FMAGC
52 MPTH
53 VSM
54 VCC
55 RAMBU
56 TUNATT
57 VOLATT
58 ATT
59 AMPON
60 AMPATT
I/O
O Tuner power control output (+5 V)
— Not used. (Open)
O SONY-BUS ON control output
— Not used. (Open)
O Illumination power control output
— Power supply pin (+5 V)
I/O E 2 P SONY-BUS serial data input/output
2
I/O E P SONY-BUS serial clock input/output
O SONY-BUS system reset output
I DOOR OPEN/CLOSE detection input ("L": CLOSE, "H": OPEN)
O LCD serial data output
O LCD serial clock output
O LCD chip enable output
O BEEP output
I SONY-BUS serial data input
O SONY-BUS serial data output
O SONY-BUS serial clock output
I SONY-BUS serial clock input
I CD/MD select input ("L": CD, "H": MD) (Fixed at "L" in this set)
I Flash memory write mode detection input
— Not used. (Open)
I Remote commander (infrared ray reception) input
— Not used. (Open)
O DOOR indicator output
O Not used in this set.
— Not used. (Open)
O Noise mask output
— Ground
— Condenser connection pin of power stabilization.
O Power control output for A/D converter.
I Rotary encoder 0, 1 input
— D/A converter Vref pin (+5 V)
— D/A converter ground pin
— Not used. (Open)
— Analog power supply pin (+5 V)
— A/D converter Vref+ pin (+5 V)
— A/D converter Vref– pin
— Analog ground
I Key 0, 1 input
I Rotary commander key input
I Destination setting input (Fixed at "L" in this set)
I Noise detection input
I FM AGC detection input
I Multi path detection input
I Signal meter detection input
— Power supply pin (+5 V)
I RAM reset detection input
O TUNER mute control output
O Electric volume mute output
O LINE mute output
O Power amplifier standby control output
O Power amplifier mute control output
Pin Description
19