Sony CDX-C7850 Service Manual ▷ View online
– 25 –
Pin No.
Pin Name
I/O
Pin Description
106
AVSS2
—
R-ch, Analog GND.
107
ROUT2
O
R-ch, LINE output. (Not used.)
108
AIN2
I
R-ch, OP amplifier input. (Connect to GND.)
109
AOUT2
O
R-ch, Analog output. (Not used.)
110
AVDD2
—
R-ch, Analog power supply.
111
AVSS2
—
R-ch, Analog GND.
112
VSS0
—
Digital GND
– 26 –
• IC501 MB90574PFV-G-182-BND (SYSTEM CONTROL) (MAIN BOARD)
Pin No.
Pin Name
I/O
Pin Description
1
SEKOUT
O
SEEK OUT output
2
AF-SEEK
O
AF SEEK output (Not used in this set.)
3
WIDE
O
WIDE/NARROW select output
4
ST-MONO
I/O
Use a thing both as ST-IND display input and force MONO output.
5
TUNMUTE
O
Tuner mute output
6
FM-ON
O
FM ON output
7
TU-ON
O
Tuner ON output
8
VCC
—
Power supply pin (+5 V)
9
CSV-RST
O
Audio composition IC reset output
10
BUSON
O
Bus ON control output
11
SYSRST
O
System reset output
12
DOORSW
I
Door OPEN/CLOSE detection input
13
LCDSO
O
LCD serial data output
14
LCDCKO
O
LCD serial clock output
15
BEEP
O
BEEP output
16
LCDCE
O
LCD chip enable output
17
UNISI
I
Serial data input
18
UNISO
O
Serial data output
19
UNICKIO
I/O
Serial clock input/output
20
SD-IN
I
Signal detector input
21
CSV-SO
O
Audio composition serial data output
22
CSV-CKO
O
Audio composition serial clock output
23
CSV-CE
O
Audio composition chip enable output
24
SIRCS
I
Remote commander input
25
PLLSI
I
PLL data input
26
PLLSO
O
PLL data output
27
PLLCKO
O
PLL clock output
28
PLLCE
O
PLL chip enable output
29
ILL-ON
O
Illumination power control output
30
DIMMER
O
Dimmer control output
31
TIRIND
O
TIR indicator control output
32
LCDINH
O
LCD blank display control output
33
VSS
—
GND
34
C
—
Power stabilization capacitor pin
35
AD-ON
O
Power control output of A/D conversion.
36, 37
RE-IN0, 1
I
Rotary encoder input 0, 1
38
DVCC
—
D/A converter VREF input
39
DVSS
—
GND of D/A converter.
40
NCO
O
Not used.
41
LCDANG
O
LCD view angle alignment output
42
AVCC
—
Analog power supply pin (+5 V)
43
AVRH
—
A/D converter VREF+ input
44
AVRL
—
A/D converter VREF- input
45
AVSS
—
Analog GND
46, 47
KEYIN0, 1
I
Key input 0, 1
48
RC-IN0
I
Rotary commander input 0
49
DSTSEL0
I
Destination select input 0 (Fixed at “L” in this set.)
50
DSTSEL1
I
Destination select input 1 (Fixed at “H” in this set.)
51
DSTSEL2
I
Destination select input 2 (Fixed at approx. 3.8 V in this set.)
52
MTP
I
Tuner multi-pass input (Not used in this set.)
53
VSM
I
S-Meter voltage detection input
54
VCC
—
Power supply pin (+5 V)
– 27 –
Pin No.
Pin Name
I/O
Pin Description
55
RAMBU
I
RAM reset detection input
56
POWSEL
I
Power select initial setting input
57
EQ-SEL
I
Equalizer connection with/without detection initial input
58
TESTIN
I
Test mode setting detection input
59
DOORIND
O
Door indicator output
60
EJECT-OK
O
Eject control output
61, 62
SUB-SW1, 0
O
Simple SUB WOOFER control output 1, 0
63
VSS
—
GND
64
VOLCE
O
Electric volume serial chip enable output
65
MUTE
O
System mute control output
66
VOLSO/SUBSO
O
Main/Sub volume serial data output
67
VOLCKO/SUBCKO
O
Main/Sub volume serial clock output
68
SUBCE
O
Sub volume serial chip enable output
69
FLASH-W
I
Flash write in mode detection input
70
I2CSIO
I/O
RDS serial data input/output (Not used in this set.)
71
I2CCKO
O
RDS serial clock output (Not used in this set.)
72
RC-IN1
I
Rotary commander input
73
X1A
—
Low speed oscillation input (32.768 kHz)
74
X0A
—
Low speed oscillation input (32.768 kHz)
75
DAVN
I
RDS IC data taking in detection input (Not used in this set.)
76
KEYACK
I
Key input acknowledge
77
BU-IN
I
Back-up power detection input
78
ILLIN
I
Illumination line detection input
79
TELMUTE
I
Telephone mute detection input
80
NOSESW
I
Front panel detachable detection input
81
ACCIN
I
Accessory power detection input
82 – 85
TIR-D0 – D3
I/O
TIR IC command input/output 0 – 3 (Not used in this set.)
86
(VCC)
—
Connect to power supply pin.
87
(VSS)
—
Connect to GND.
88, 89
(VCC)
—
Connect to power supply pin.
90
RST
—
Microcomputer reset input
91
VSS
—
GND
92
X0
—
High speed oscillation input (3.68 MHz)
93
X1
—
High speed oscillation input (3.68 MHz)
94
VCC
—
Power supply pin (+5 V)
95
ATT-IN
I
CD mute signal input
96
TIR-WR
O
TIR IC data write in pulse output (Not used in this set.)
97, 98
TIR-CE
O
TIR IC chip enable output (Not used in this set.)
99
TIR-RES
O
TIR IC reset/power down output (Not used in this set.)
100
TIR-PDWN
O
TIR IC power down output (Not used in this set.)
101
TIR-RD
O
TIR IC data read in pulse output (Not used in this set.)
102
MTLIN
I
Auto METAL detection input (Not used in this set.)
103
AM STIN
I
AM stereo detection input (Not used in this set.)
104
REEL
I
Tape reel table rotation detection input (Not used in this set.)
105
POS0
I
Tape position detection input 0 (Fixed at “H” in this set.)
106
POS1
I
Tape position detection input 1 (Fixed at “H” in this set.)
107
POS2
I
Tape position detection input 2 (Fixed at “H” in this set.)
108
POS3
I
Tape position detection input 3 (Fixed at “H” in this set.)
109
LM-EJ
O
Tape loading motor control output (Eject direction) (Not used in this set.)
110
LM-LOD
O
Tape loading motor control output (Loading direction) (Not used in this set.)
111
CM-ON
O
Tape capstan motor control output (Not used in this set.)
112
TAPEON
O
Tape power control output (Not used in this set.)
113
N-ROUT
O
Tape forward/reverse detection output (Not used in this set.)
– 28 –
Pin No.
Pin Name
I/O
Pin Description
114
AMSON
O
Tape AMS control output (Not used in this set.)
115
DSP-ON
O
Internal power amplifier control output
116
DOLBY
I/O
Tape DOLBY control input/output (Not used in this set.)
117
CSV-NAR
I
Audio composition request signal input
118
LEDON
O
Front panel LED control output
119
VSS
—
GND
120
POWON
O
System power control output
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