Sony HCD-GT22 / HCD-GT44 / HCD-GT55 / MHC-GT22 / MHC-GT22BP / MHC-GT44 / MHC-GT44BP / MHC-GT55 / MHC-GT55BP Service Manual ▷ View online
65
HCD-GT22/GT44/GT55
Pin No.
Pin Name
I/O
Description
82
NO USE
O
Not used
83
DVSS
-
Ground terminal
84
DO
O
Clear to send signal output to the system controller
85
DATA
I
Audio data input from the CD-MP3 processor
86
CLOCK
I
Audio data transfer clock signal input from CD-MP3 processor
87
TXD1
O
Serial data output to the system controller
88
RXD1
I
Serial data input from the system controller
89
NO USE
O
Not used
90
SDA
I/O
Two-way EEPROM IIC data bus terminal Not used
91
SCL
I/O
Two-way EEPROM IIC clock bus terminal Not used
92
BCK
O
Bit clock signal output to the CD-MP3 processor
93
DATA
O
Audio data output to the CD-MP3 processor
94
GATE
O
Gate signal output to the CD-MP3 processor
95
DVCC
-
Power supply terminal (+3.3 V)
96
REQ
I
Request signal input from the CD-MP3 processor
97
ST-REQ
I
Request signal input from the CD-MP3 processor
98, 99
G-1, G-2
I
Function selection signal input terminal Fixed at "H" in this set
100
DVSS
-
Ground terminal
66
HCD-GT22/GT44/GT55
MAIN BOARD IC901 uPD78F1165GF (S)-305-GAS-AX (SYSTEM CONTROLLER)
Pin No.
Pin Name
I/O
Description
1
O-SYS-MUTE
O
Muting on/off control signal output terminal "L": muting on
2
O-SWR
O
Sub woofer speaker on/off relay drive signal output terminal (GT44/GT55)
3
O-FRONT-SP-
RELAY
O
Power on/off control signal output for speaker relays
4
O-CD-POWER
O
Power on/off control signal output for CD block
5
O-POWER-
RELAY
O
Power on/off relay drive signal output terminal "H": power on
6
CD XRST
O
Reset signal output to the CD-MP3 processor "L": reset
7
CD-M-MUTE
O
Muting signal output to the coil/motor driver
8
O-USB-POWER
O
Power on/off control signal output for USB block
9
I-USB-CTS (DI)
I
Clear to send signal input from the USB controller
10
O-USB-RTS (DO)
O
Ready to send signal output to the USB controller
11
O-USB-RESET
O
Reset signal output to the USB controller "L": reset
12
CD-BUCK
O
Serial data transfer clock signal output to the CD-MP3 processor
13
CD-CCE
O
Chip enable signal output to the CD-MP3 processor
14 to 17
CD-BUS3 (I/O) to CD-
BUS0 (I/O)
I/O
Two-way data bus with the CD-MP3 processor
18
MP3 IREQ
I
Request signal input from the CD-MP3 processor
19
CD-SEL1
O
Data selection signal output terminal
20
EVSS1
-
Ground terminal
21
CD-SEL2
O
Data selection signal output terminal
22
O-LM-R
O
Loading motor control signal output terminal (reverse direction)
23
O-LM-F
O
Loading motor control signal output terminal (forward direction)
24
O-TM-R
O
Table motor control signal output terminal (reverse direction)
25
O-TM-F
O
Table motor control signal output terminal (forward direction)
26
I-CD-SENS
I
Disc table address sensor input terminal
27
I-OPEN-SW
I
Disc table open/close detection switch input terminal "L": open, "H": close
28
O-LC72121-CE
O
Chip enable signal output to the tuner (FM/AM)
29
I-SBSY
I
Subcode block sync signal input from the CD-MP3 processor
30
EVDD1
-
Power supply terminal (+3.3V)
31
I-LV23004T-DI
I
Serial data input from the tuner (FM/AM)
32
O-LV23004T
-CLK
O
Serial data transfer clock signal output to the tuner (FM/AM)
33
O-LV23004T-DO
O
Serial data output to the tuner (FM/AM)
34
I-TUNED
I
Tuning detection signal input from the tuner
35
I-AC-CUT
I
AC power off detection signal input terminal
36
O-STK-MUTE
O
Standby signal output to the power amplifier (for front speaker)
37
O-USB-LED
O
LED drive signal output terminal for REC (USB) indicator "H": LED on
38
O-G-LED
O
LED drive signal output terminal for GUITAR indicator "H": LED on
39
O-V-LED
O
LED drive signal output terminal for VOCAL indicator "H": LED on
40
O-B-LED
O
LED drive signal output terminal for BASE indicator "H": LED on
41
O-F-DATA
O
Serial data output to the electrical volume
42
I-USB-RXD (SI)
I
Serial data input from the USB controller
43
O-USB-
TXD (SO)
O
Serial data output to the USB controller
44
O-P-DATA
O
Serial data output to the parametric equalizer (GT55)
67
HCD-GT22/GT44/GT55
Pin No.
Pin Name
I/O
Description
45
O-AUDIO-CLK
O
Serial data transfer clock signal output to the electrical volume and parametric equalizer (GT55)
Serial data transfer clock signal output to the electrical volume (GT22/GT44)
Serial data transfer clock signal output to the electrical volume (GT22/GT44)
46
O-REC/PB
O
Deck-A/B selection and recording/playback selection signal output terminal
"L": deck-B and playback, "H": deck-A and recording
"L": deck-B and playback, "H": deck-A and recording
47
AVREF1
I
Reference voltage (+3.3V) input terminal
48
O-REC-MUTE
O
Recording muting on/off control signal output terminal "L": muting on
49
O-BIAS
O
Recording bias on/off control signal output terminal "H": bias on
50
AVREF0
I
Reference voltage (+3.3V) input terminal
51
AVSS
-
Ground terminal
52
I-USB-MONI
I
USB power (VBUS) monitoring input terminal
53
I-SUFIX
I
Setting terminal for the destination
54
I-MODEL
I
Setting terminal for model discrimination
55
I-ENCD
I
Disc table address sensor (rotary encoder) input terminal (A/D input)
56
I-KEY4
I
Front panel key input terminal (A/D input) (GT55)
57
I-PROTECTOR
I
AC power detection signal input, and protect signal input terminal
58
I-HP/MIC
I
Headphone and microphone plug insert detection signal input terminal (A/D input)
59
I-VACS
I
VACS signal input terminal (A/D input)
60
I-TAPE-STAT
I
Deck-A/B cassette detection signal input from the tape mechanism deck block, and Recording-
proof detection signal input from the tape mechanism deck block (A/D input)
proof detection signal input from the tape mechanism deck block (A/D input)
61 to 64
I-KEY0 to I-KEY3
I
Front panel key input terminal (A/D input)
65
I-JOG I
Jog dial pulse input from the rotary encoder (multi jog) (A/D input)
66
I-VOL I
Jog dial pulse input from the rotary encoder (VOLUME) (A/D input)
67
I-STREAM
I
Audio signal input for stream LED (A/D input)
68
O-NJM3427FA2
-CS
O
Chip select signal output to the fluorescent indicator tube driver
69
O-NJM3427FA2
-RESET
O
System reset signal output to the fluorescent indicator tube driver "L": reset
70 to 75
O-S-LED1 to
O-S-LED6
O
LED drive signal output of the stream indicator "H": LED on
76
O-SWR-LED
O
LED drive signal output of the SUBWOOFER indicator "H": LED on (GT44/GT55)
77
O-STBY-LED
O
LED drive signal output terminal for STANDBY indicator "H": LED on
78
I-REEL-A
I
Deck-A tape reel rotating detection signal input from the tape mechanism deck block
79
I-REEL-B
I
Deck-B tape reel rotating detection signal input from the tape mechanism deck block
80
I-RDS-CLK
I
RDS data transfer clock signal input terminal Not used
81
I-SIRCS-IN
I
SIRCS signal input from the remote control receiver
82
NC
-
Not used
83
I-WAKEUPKEY
I
Wake up signal input terminal
84
O-NJM3427A-
DATA
O
Serial data output to the fluorescent indicator tube driver
85
O-MOTOR
O
Capstan/reel motor drive signal output terminal "H": motor on
86
O-NJM3427A2-
CLK
O
Serial data transfer clock signal output to the fluorescent indicator tube driver
87
O-B-SOL
O
Deck-B side trigger plunger drive signal output terminal "H": plunger on
88
O-A-SOL
O
Deck-A side trigger plunger drive signal output terminal "H": plunger on
89
TOOL0
I
Not used
90
RESET
I
System reset signal input from the reset signal generator "L": reset
For several hundreds msec. after the power supply rises, "L" is input, then it changes to "H"
For several hundreds msec. after the power supply rises, "L" is input, then it changes to "H"
68
HCD-GT22/GT44/GT55
Pin No.
Pin Name
I/O
Description
91
XT2
O
Sub system clock output terminal (32.768 kHz)
92
XT1
I
Sub system clock input terminal (32.768 kHz)
93
FLMD0
I
Not used
94
X2
O
Main system clock output terminal (20 MHz)
95
X1
I
Main system clock input terminal (20 MHz)
96
REGC
I
External capacitor connection terminal for regulator
97
VSS
-
Ground terminal
98
EVSS0
-
Ground terminal
99
VDD
-
Power supply terminal (+3.3V)
100
EVDD0
-
Power supply terminal (+3.3V)
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