Sony CFD-E90 Service Manual page 39

• IC Pin Function Description
MAIN BOARD IC801 µPD789478GC-A04-8BT (SYSTEM CONTROLLER)
Pin No. Pin Name
1, 2
NC
3 to 5 VLC2 to VLC0
6 to 9 COM0 to COM3
10 to 28 SEG0 to SEG18
29 REC
BL-RED
30
31 BL-ORG
BL-GRN
32
BL-BLUE
33
LINE
34
35 CD
TAPE
36
37 ISS2
38 AVDD
39 AC-CHK
CD DOOR
40
6V-CHK
41
3V-CHK
42
9V-CHK
43
KEY2, KEY1
44, 45
46 MODE CHK
47
AGND
48 RMC
49
TC-PLAY
50
WP/INI
51 JOG-A
52
C-WRQ
53
C-DOUT
54
C-DIN
55
C-CLK
56
R-COUNT
57
R-DATA
58 R-CLK
59
R-LAT
60
R-MUTE
61
C-DRF
62 C-CE
63
C-FSEQ
64
C-XRT
65 P-CON
66 A-MUTE
67 JOG-B
68
M-BASS
69
IC0
I/O
— Not used
— Terminal for doubler circuit capacitor connection to develop liquid crystal display drive voltage
O Common drive signal output to the liquid crystal display
O Segment drive signal output to the liquid crystal display
Recording/playback detection signal input terminal
I
"L": playback mode, "H": recording mode
O LCD back light (red) on/off control signal output terminal "H": Red LED on Not used
O LCD back light (orange) on/off control signal output terminal "H": Orange LED on Not used
O LCD back light (green) on/off control signal output terminal "H": Green LED on Not used
O LCD back light (blue) on/off control signal output terminal "H": Blue LED on Not used
O
Line function control signal output terminal "H": line on Not used
O CD function control signal output terminal "H": CD on
O
Tape function control signal output terminal "H": tape on
O ISS 2 on/off control signal output terminal "H": ISS 2 on
— Power supply terminal (+3.3V)
I AC voltage detection signal input terminal "L": AC detected
I
CD lid open/close detection switch input terminal "L": CD lid is closed, "H": CD lid is opened
I
Power supply voltage (+6V) monitor input terminal
I
Power supply voltage (+3V) monitor input terminal
I
Power supply voltage (+9V) monitor input terminal Not used
I
Front panel key input terminal (A/D input)
I Model destination setting terminal
— Ground terminal
I
Remote control signal input from the remote control receiver
I Tape play detection switch input terminal "L": tape play mode
Interrupt status input terminal
I/O
Output terminal for wake up/Initial reset signal reading
I
Jog dial pulse input from the encoder
I Interruption detection signal input from the digital signal processor
I Serial data input from the digital signal processor
O Serial data output to the digital signal processor
O Serial data transfer clock signal output to the digital signal processor
I PLL serial count data input from the FM/AM PLL
O PLL serial data output to the FM/AM PLL
O PLL serial data transfer clock signal output to the FM/AM PLL
O PLL chip enable signal output to the FM/AM PLL
O Tuner muting on/off control signal output to the FM/AM PLL "H": muting on
I Focus on/off detection signal input from the digital signal processor
O Chip enable signal output to the digital signal processor
I Synchronizing signal detection signal input from the digital signal processor
O System reset signal output to the digital signal processor "L": reset
O
Power on/off control signal output terminal "L": standby mode, "H": power on
O Audio muting on/off control signal output terminal "H": muting on
I
Jog dial pulse input from the encoder
O Megabass on/off control signal output terminal "L": megabass on
I Not used
Description
CFD-E90
39