Read Sony CDX-S2020 Service Manual online
28
CDX-S2020
• IC501 MN101E01KDC2 (SYSTEM CONTROL) (MAIN BOARD (2/2))
Pin No.
Pin Name
I/O
Pin Description
1
DAVDD
—
D/A converter power supply (+) pin (+3.3 V)
2
NCO
O
Not used. (Open)
3
DAVSS
—
D/A converter power supply (–) pin
4
UNISO
O
Not used. (Open)
5
UNISI
I
Not used. (Fixed at L in this set)
6
UNICKO
O
Not used. (Fixed at L in this set)
7
RETRA
O
Not used. (Open)
8, 9
NCO
O
Not used. (Open)
10
VDD1
—
Power supply pin (+3.3 V)
11
MMOD
I
Not used. (Fixed at L in this set)
12
OSCOUT
O
Main clock output (27 MHz)
13
OSCIN
I
Main clock input (27 MHz)
14
VSS1
—
Ground
15
XIN
I
Sub clock input (32.768 kHz)
16
XOUT
O
Sub clock output (32.768 kHz)
17
VDD2
—
Power supply pin (+3.3 V)
18
MOD1
—
Not used. (Fixed at H in this set)
19
RESET
I
Microcomputer reset input
20
RCIN1
I
Rotary commander SHIFT key input
21
ACCIN
I
Accessory power supply detection input
22
TESTIN
I
Test mode detection input
23
TELATT
I
Telephone attenuator detection input
24
ATT
O
Audio mute control output
25
XKEYON
O
Key power supply control output
26
NCO
O
Not used. (Open)
27
KEYACK
I
Key acknowledge detection input
28
TU_ATTIN
I
Mute zero cross detection input from tuner unit.
29, 30
NCO
O
Not used. (Open)
31
BUIN
I
Backup power supply detection input
32
CD_INTQ
I
CD text pack synchronization signal input from CD servo IC.
33
CD_SO
O
Serial data output to CD servo IC.
34
CD_SI
I
Serial data input from CD servo IC.
35
CD_SCK
O
Serial clock output to CD servo IC.
36
BUSON
O
Not used. (Fixed at H in this set)
37
SYSRST
O
Not used. (Fixed at H in this set)
38
CD_RFOK
I
RFOK signal input from CD servo IC.
39
CD_RST
O
Reset signal output to CD servo IC.
40
CD_A0
O
Command/parameter discrimination signal output to CD servo IC.
41
CD_STB
O
Data strobe signal output to CD servo IC.
42
CD_MUTE-R
I
Mute zero cross detection input (R-ch) from CD mechanism deck.
43
CD_MUTE-L
I
Mute zero cross detection input (L-ch) from CD mechanism deck.
44
CD_INSW
I
Disc in switch detection input from CD mechanism deck.
45
CD_SELFSW
I
Self switch detection input from CD mechanism deck.
46
CD_LM_LO
O
Loading motor control output to CD mechanism deck. (Loading direction)
47
CD_LM_EJ
O
Loading motor control output to CD mechanism deck. (Eject direction)
48
CD_DSW
I
Down switch detection input from CD mechanism deck.
49
CD_LIMIT
I
Limit switch detection input from CD mechanism deck.
50
AMPATT
O
Not used. (Fixed at L in this set)
51
AREASEL2
O
Not used. (Open)
52
AREASEL1
O
Not used. (Open)
53
AREASEL0
I
Destination area initial setting input (Fixed at H in this set)
54
COL_SW
I
1 color/2 color select input (1 color) (Fixed at L in this set)
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