Read Sony CFD-E90L Service Manual online
39
CFD-E90L
MAIN BOARD IC801
µ
PD789478GC-A04-8BT (SYSTEM CONTROLLER)
Pin No.
Pin Name
I/O
Description
1, 2
NC
—
Not used
3 to 5
VLC2 to VLC0
—
Terminal for doubler circuit capacitor connection to develop liquid crystal display drive voltage
6 to 9
COM0 to COM3
O
Common drive signal output to the liquid crystal display
10 to 28
SEG0 to SEG18
O
Segment drive signal output to the liquid crystal display
29
REC
I
Recording/playback detection signal input terminal
“L”: playback mode, “H”: recording mode
“L”: playback mode, “H”: recording mode
30
BL-RED
O
LCD back light (red) on/off control signal output terminal “H”: Red LED on Not used
31
BL-ORG
O
LCD back light (orange) on/off control signal output terminal “H”: Orange LED on Not used
32
BL-GRN
O
LCD back light (green) on/off control signal output terminal “H”: Green LED on Not used
33
BL-BLUE
O
LCD back light (blue) on/off control signal output terminal “H”: Blue LED on Not used
34
LINE
O
Line function control signal output terminal “H”: line on
35
CD
O
CD function control signal output terminal “H”: CD on
36
TAPE
O
Tape function control signal output terminal “H”: tape on
37
ISS2
O
ISS 2 on/off control signal output terminal “H”: ISS 2 on
38
AVDD
—
Power supply terminal (+3.3V)
39
AC-CHK
I
AC voltage detection signal input terminal “L”: AC detected
40
CD DOOR
I
CD lid open/close detection switch input terminal “L”: CD lid is closed, “H”: CD lid is opened
41
6V-CHK
I
Power supply voltage (+6V) monitor input terminal
42
3V-CHK
I
Power supply voltage (+3V) monitor input terminal
43
9V-CHK
I
Power supply voltage (+9V) monitor input terminal Not used
44, 45
KEY2, KEY1
I
Front panel key input terminal (A/D input)
46
MODE CHK
I
Model destination setting terminal
47
AGND
—
Ground terminal
48
RMC
I
Remote control signal input from the remote control receiver
49
TC-PLAY
I
Tape play detection switch input terminal “L”: tape play mode
50
WP/INI
I/O
Interrupt status input terminal
Output terminal for wake up/Initial reset signal reading
Output terminal for wake up/Initial reset signal reading
51
JOG-A
I
Jog dial pulse input from the encoder
52
C-WRQ
I
Interruption detection signal input from the digital signal processor
53
C-DOUT
I
Serial data input from the digital signal processor
54
C-DIN
O
Serial data output to the digital signal processor
55
C-CLK
O
Serial data transfer clock signal output to the digital signal processor
56
R-COUNT
I
PLL serial count data input from the FM/AM PLL
57
R-DATA
O
PLL serial data output to the FM/AM PLL
58
R-CLK
O
PLL serial data transfer clock signal output to the FM/AM PLL
59
R-LAT
O
PLL chip enable signal output to the FM/AM PLL
60
R-MUTE
O
Tuner muting on/off control signal output to the FM/AM PLL “H”: muting on
61
C-DRF
I
Focus on/off detection signal input from the digital signal processor
62
C-CE
O
Chip enable signal output to the digital signal processor
63
C-FSEQ
I
Synchronizing signal detection signal input from the digital signal processor
64
C-XRT
O
System reset signal output to the digital signal processor “L”: reset
65
P-CON
O
Power on/off control signal output terminal “L”: standby mode, “H”: power on
66
A-MUTE
O
Audio muting on/off control signal output terminal “H”: muting on
67
JOG-B
I
Jog dial pulse input from the encoder
68
M-BASS
O
Megabass on/off control signal output terminal “L”: megabass on
69
IC0
I
Not used
•
IC Pin Function Description
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