Sony CDX-3900R, Service Manual

Page: 19 / 54

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• IC501 MB90574PMT-G-266-BND (SYSTEM CONTROL) (MAIN BOARD)
Pin No. Pin Name I/O Pin Description
1 TUNON O Tuner power control output (+5 V)
2 — — Not used. (Open)
3 BUSON O SONY-BUS ON control output
4 – 6 — — Not used. (Open)
7 ILLON O Illumination power control output
8 VCC — Power supply pin (+5 V)
9 E2P SIO I/O E 2 P SONY-BUS serial data input/output
10 E2P CKO I/O E
2
P SONY-BUS serial clock input/output
11 SYSRST O SONY-BUS system reset output
12 DOORSW (WRITE OUT) I DOOR OPEN/CLOSE detection input (“L”: CLOSE, “H”: OPEN)
13 LCDSO (WRITE IN) O LCD serial data output
14 LCDCKO O LCD serial clock output
15 LCDCE O LCD chip enable output
16 BEEP O BEEP output
17 UNISI I SONY-BUS serial data input
18 UNISO O SONY-BUS serial data output
19 UNICKO O SONY-BUS serial clock output
20 UNICKI I SONY-BUS serial clock input
21 CD MD I CD/MD select input (“L”: CD, “H”: MD) (Fixed at “L” in this set)
22 FLASHW I Flash memory write mode detection input
23 — — Not used. (Open)
24 SIRCS I Remote commander (infrared ray reception) input
25 – 28 — — Not used. (Open)
29 DOORIND O DOOR indicator output
30 IFWIDTH O Not used in this set.
31 — — Not used. (Open)
32 NS MASK O Noise mask output
33 VSS — Ground
34 C — Condenser connection pin of power stabilization.
35 AD ON O Power control output for A/D converter.
36, 37 REIN0, 1 I Rotary encoder 0, 1 input
38 DVCC — D/A converter Vref pin (+5 V)
39 DVSS — D/A converter ground pin
40, 41 — — Not used. (Open)
42 AVCC — Analog power supply pin (+5 V)
43 AVRH — A/D converter Vref+ pin (+5 V)
44 AVRL — A/D converter Vref– pin
45 AVSS — Analog ground
46, 47 KEYIN0, 1 I Key 0, 1 input
48 RCIN0 I Rotary commander key input
49 DSTSEL I Destination setting input (Fixed at “L” in this set)
50 QUALITY I Noise detection input
51 FMAGC I FM AGC detection input
52 MPTH I Multi path detection input
53 VSM I Signal meter detection input
54 VCC — Power supply pin (+5 V)
55 RAMBU I RAM reset detection input
56 TUNATT O TUNER mute control output
57 VOLATT O Electric volume mute output
58 ATT O LINE mute output
59 AMPON O Power amplifier standby control output
60 AMPATT O Power amplifier mute control output
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