Sony CDX-GT25 Service Manual ▷ View online
CDX-GT25
21
• IC Block Diagrams
IC750 TDA8588AJ/N2/R1 (MAIN Board (1/3))
MUTE
MUTE
ENABLE
LOGIC
STANDBY/
MUTE
BATTERY
DETECTION
CHIP DETECT/
DIAGNOSTIC
PROTECTION/
DIAGNOSTIC
SWITCH
REGULATOR
SWITCH
REFERENCE
VOLTAGE
LOADDUMP
PROTECTION
TEMPERATURE
PROTECTION
BACK-UP
SWITCH
REGULATOR
1
3
5
7
9
11
13
15
17
19
21
23
25
27
29
31
33
35
37
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
TAB
OUT–FL–
OUT–FL+
OUT–RL–
OUT–RL+
IN–RL
S–GND
IN–RR
OUT–RR+
OUT–RR–
OUT–FR+
OUT–FR–
DIAG
ANT–REM
AMP–REM
SERVO3.3V
MECH6V
VP
BU+B
SDA
SCL
VP2
PGND1
SVR
IN–FL
IN–FR
BEEP
PGND3
VP1
STB
PGND4
RST
CRES
AUDIO+B
GND
PANEL+B
CBU
FL
RL
RR
VP
FR
I
2
C BUS
CDX-GT25
22
IC1 TEF6617T/V1/S470,518 (MAIN Board (2/3))
AMRFIN 1
AMRFDEC 2
FMIN2 3
FMIN1 4
LOUT 8
ROUT 9
MPXOUT 13
RSSI 14
XTAL2 15
XTAL1 16
GNDAUD 10
GNDRF 5
VCC2 6
AMRFAGC 7
AMIFAGC2 11
MPXIN 12
AMSELOUT2
32
AMSELOUT1
31
AMIFAGC1
30
AMSELIN2
29
PLL
25
VCODEC
24
VREF
20
SDA
19
SCL
18
GNDD
17
GND
23
AMSELIN1
28
DAV N
27
PLLREF
26
VCC1
22
VREGSUP
21
AM
TUNER
FM
TUNER
OUTPUT
PLL
TUNING
SYSTEM
I2C BUS
POWER
SUPPLY
STEREO DECODER
HIGH CUT
SOFT MUTE
NOISE BLANKER
SIGNAL
IMPROVEMENT
CONTROL
BANDWIDTH
CONTROL
RDS
DEMODULATOR
AND
DECODER
CDX-GT25
23
IC402 BD3705FV-E2 (MAIN Board (2/3))
3
A1
1
NC
4
A2
5
B1
6
B2
7
CP1
9
CP2
8
CN
2
FIL
VCC2
OUTF1
VCC
VCC
SCL
SDA
26
25
24
22
21
20
19
18
17
16
15
23
FADER
FADER
FADER
FADER
LOUDNESS
3 BAND P-EQ(TONE CONTROL)
VOLUME/MUTE
INPUT GAIN
GND
ISO AMP
10
DP1
11
DN1
GND
ISO AMP
12
DN2
13
DP2
GND
ISO AMP
14
NC
INPUT SELECTOR (2 SIGNAL END 2 STEREO (SO))
OUTF2
OUTR1
OUTR2
OUTS1
OUTS2
LOUT MUTE
NC
I2C BUS
LOGIC
FADER
LPF
GND
ISO AMP
LEVEL METER
(I2C)
NC
A-GND
28
27
CDX-GT25
24
• IC Pin Function Description
MAIN BOARD IC501 R5F3640DDA16FA (SYSTEM CONTROL)
Pin No.
Pin Name
I/O
Description
1
LCD SO
O
Liquid crystal display panel serial data signal output
2
LCD CKO
O
Liquid crystal display panel serial clock signal output
3
NOSE SW
I
Front Panel detach/attach detect signal input “L”: With panel
4
SIRCS
I
Remote control signal input
5
UNISO
O
SONY BUS serial data signal output
6
UNISI
I
SONY BUS serial data signal input
7
UNISCK
O
SONY BUS serial clock signal output
8
BYTE
I
Connect to ground.
9
CNVSS
I
Not used. (fi xed at “L”.)
10
XIN
I
Low speed operation clock signal input (32.768kHz)
11
XOUT
O
Low speed operation clock signal output (32.768kHz)
12
RESET
I
Reset signal input
13
OSCOUT
O
High speed operation clock signal output (11.06MHz)
14
VSS
—
Ground pin
15
OSCIN
I
High speed operation clock signal input (11.06MHz)
16
VCC1
—
Power supply pin (+3.3V)
17
NMI
I
External pull up pin (fi xed at “H”.)
18
NCO
O
Not used. (Open)
19
BUIN
I
Back up power supply detection signal input
20
CDM ON
I
CD mechanism deck power supply control request signal input
21
Z MUTE
I
Mute signal input
22 to 27
NCO
O
Not used. (Open)
28
BEEP
O
Beep signal output to power amplifi er
29
I2C SCK
O
I2C serial clock signal output
30
I2C SIO
I/O
I2C serial data signal input/output
31
FW TXD
O
Not used. (fi xed at “H”.)
32
FW RXD
I
Not used. (fi xed at “H”.)
33
FW CLK
I
Not used. (Open)
34
FW BUSY
O
Not used. (Open)
35 to 40
NCO
O
Not used. (Open)
41
EPM
O
EPM signal output (Connect to ground.)
42
RC IN1
I
Rotary commander shift key signal input
43
SYSRST
O
System reset signal output
44
BUSON
O
BUS ON signal output
45
NCO
O
Not used. (Open)
46
CE
O
Not used. (Open)
47 to 51
NCO
O
Not used. (Open)
52
CD ON
I
CD mechanism servo power supply control request signal input
53
TESTIN
I
Test mode detection signal input Not used.
54
TELATT
I
Telephone attenuate detection signal input Not used.
55
ACC IN
I
Accessory power supply detection signal input
56
ATT
O
Audio mute control signal output
57
DIAG
I
Power amplifi er status signal input
58
AMPSTB
O
Standby signal output to power regulator IC
59 to 61
NCO
O
Not used. (Open)
62
VCC2
—
Power supply pin (+3.3V)
63
NCO
O
Not used. (Open)
64
VSS
—
Ground pin
65
ILLUMI SEL
I
Illumination voltage setting signal input for panel
66
NCO
I
Not used. (Open)
67
DIM SEL
I
Dimmer function setting signal input “L”: No dimmer
68
B OUT SEL
I
Black out setting signal input “L”: No block out
69
AREASEL 3
I
Destination setting pin 3
70
AREASEL 2
I
Destination setting pin 2 Frequency select switch signal input
71
AREASEL 1
I
Destination setting pin 1
72
AREASEL 0
I
Destination setting pin 0
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