Read Sony HCD-GTX88 / HCD-GTX88BP Service Manual online
77
HCD-GTX88/GTX88BP
IC900 MB90M407PF-G-151E1 (DISPLAY CONTROL, KEY CONTROL) (PANEL BOARD)
Pin No.
Pin Name
I/O
Pin Description
1 to 8
G16 to G23
O
Grid drive signal output to the vacuum fluorescent display
9, 10
P35, P36
O
Segment drive signal output to the vacuum fluorescent display
11
VSS-IO
—
Ground pin (for I/O port)
12 to 22
P34 to P24
O
Segment drive signal output to the vacuum fluorescent display
23
VDD-FIP
—
Power supply pin (+3.3 V) (for vacuum fluorescent display)
24 to 41
P23 to P6
O
Segment drive signal output to the vacuum fluorescent display
42
VSS-IO
—
Ground pin (for I/O port)
43 to 47
P5 to P1
O
Segment drive signal output to the vacuum fluorescent display
48
VKK
—
Power supply pin (+3.3 V) (for vacuum fluorescent display)
49 to 51
MD0 to MD2
I
Setting pin for the CPU operational mode
52
LED-VIDEO, USB
O
Dynamic LED drive signal output of the VIDEO and USB indicator (“H”: LED on)
53
LED-TAPE, AUDIO
O
Dynamic LED drive signal output of the TAPE and AUDIO indicator (“H”: LED on)
54
LED-CD, TUNER
O
Dynamic LED drive signal output of the CD and TUNER indicator (“H”: LED on)
55
LED-VOL1, 2
O
Dynamic LED drive signal output of the (VOL1) and (VOL2) indicator (“H”: LED on)
56
LED-VOL3, 4
O
Dynamic LED drive signal output of the VOL3 1st and VOL4 indicator (“H”: LED on)
57
LED-VOL5, 6
O
Dynamic LED drive signal output of the VOL5 3rd and VOL6 indicator (“H”: LED on)
58
LED-FF, FR
O
Dynamic LED drive signal output of the FF and FR indicator (“H”: LED on)
59
LED-REC/ERASE,
O
Dynamic LED drive signal output of the REC/ERASE and CD-USB SYNC/REC 1
CD-USB SYNC/REC 1
(“H”: LED on)
60
12C-DATA
I/O
Clock signal for IIC communication between Master Control controller and Display
Control controller
61
12C-CLOCK
I/O
Data signal for IIC communication between Master Control controller and Display
Control controller
62
AVCC
—
Power supply pin (+3.3 V) (for A/D conversion)
63
AVSS
—
Ground pin (for A/D conversion)
64 to 66
KEY0 to KEY2
I
Key input (A/D input)
67
ALL-BAND
I
Spectrum analyzer drive signal input from the spectrum analyzer band-pass filter
(A/D input)
68 to 71
BPF4 to BPF1
I
Spectrum analyzer drive signal input from the spectrum analyzer band-pass filter
(A/D input)
72
ORERATION DIAL
I
Jog dial pulse input from ORERATION DIAL encoder
73
VOLUME
I
Jog dial pulse input from the VOLUME encoder
74
NO USE
—
Not used. (GND)
75
LED-STOP
O
Dynamic LED drive signal output of the STOP indicator (“H”: LED on)
76
LED-CD-TAPE SYNC,
O
Dynamic LED drive signal output of the CD-TAPE SYNC and TAPE REC PAUSE/
TAPE REC PAUSE/START
START indicator (“H”: LED on)
77
RESET
I
System reset signal input from the Master Control controller (“L”: reset)
78
LED-AMS +, AMS –
O
Dynamic LED drive signal output of AMS + and AMS – indicator (“H”: LED on)
Not used in this set.
79
LED-PLAY
O
Dynamic LED drive signal output of PLAY and PAUSE indicator (“H”: LED on)
80
LED selector
O
Dynamic LED drive select signal output
81
VSS-CPU
—
Ground pin (for CPU)
82
XO
O
System clock output (4 MHz)
83
XI
I
System clock input (4 MHz)
84
VCC-CPU
—
Power supply pin (+3.3 V) (for CPU)
85
NO USE
—
Not used. (GND)
86 to 100
G1 to 15
O
Grid drive signal output to the vacuum fluorescent display
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