Read Sony CMT-EP303 / HCD-EP303 Service Manual online
31
HCD-EP303
6-12. IC Pin Function Description
• IC601 µPD753016AGC-F37-3B9 SYSTEM CONTROLLER, LIQUID CRYSTAL DISPLAY DRIVER (DISPLAY BOARD)
I/O
O
O
O
I
O
O
O
O
—
O
O
O
O
I
O
O
I
I
I
I
I
O
O
O
O
I
O
O
I
—
I
O
—
I
O
I
I/O
—
I
I
I
O
Description
Segment drive signal output to the liquid crystal display (LD621)
Common drive signal output to the liquid crystal display (LD621)
Bias output for the liquid crystal display drive
Input terminal for doubler circuit capacitor connection to develop liquid crystal display drive voltage
Power on/off control signal output for the tuner section “L ”:power on
Audio line muting on/off control signal output “L ”:muting on
Power on/off control signal output for the CD section “L ”:power on
LED drive signal output of the TIMER indicator (D619)“L ”:LED on
Ground terminal
Reset signal output to the CD section “L ”:reset
Not used (pull up)
PLL serial data transfer clock signal output to the FM/AM PLL (IC102)
PLL serial data output to the FM/AM PLL (IC102)
FM and AM signal meter voltage detection input from the LA1823 (IC101)
Serial data transfer clock signal output to the LC75392 (IC203)
Serial data output to the LC75392 (IC203)
FM stereo detection signal input from the LA1823 (IC101)“L ”:stereo
Serial data transfer clock signal input from the CD section
Serial data transfer clock signal input from the RDS decoder (IC604) (not used)
Remote control signal input from the remote control receiver (RM601)
Recording on detection signal input
Audio line muting on/off control signal output “H ”:muting on
PLL chip enable signal output to the FM/AM PLL (IC102)“H ” active
Chip enable signal output to the LC75392 (IC203)“H ” active
Not used (open)
Serial data input from the RDS decoder (IC604) (not used)
System power on/off control signal out “H ”:power on
Mega bass on/off selection signal output “H ”:mega bass on
CD lid open/close detection switch (SW600)input terminal “L ”:CD lid is closed
Power supply terminal
Power failure detection input terminal “L ”:power failure,“H ”:power on
Not used (open)
Internal connection terminal (connected to power supply)
Main system clock input terminal (6 MHz)
Main system clock output terminal (6 MHz)
PLL serial data input from the FM/AM PLL (IC102)
Two-way data bus with the CD section
Not used (open)
Not used (fixed at “H ”)
Key return signal input from the key matrix “L ” input when key pressing
System reset signal input from the reset signal generator (IC603)“L ”:reset
For several hundreds msec.after the power supply rises,“L ” is input,then it changes to “H ”
Segment drive signal output to the liquid crystal display (LD621)
Pin Name
S12 to S31
COM0 to COM3
BIAS
VLC0 to VLC2
TUNER
TAPE
CD
TIMER STATUS
VSS
CD-RESET
SURROUND
PLL CL
PLL DI
TUNER SD
CLOCK
DATA
STEREO
CD CLOCK
RDS CLOCK
REMOTE
SYNCRO
MUTE
PLLCE
CE
SHRST
RDS DATA
PSW
BASS BOOST
DPSW2/SLEND
VDD
XT1
XT2
IC
X1
X2
PLLDO SELECT
CD DATA
NC
12/24H SELECT
KEY R0 to KEY R4
CPU RESET
S0 to S11
Pin No.
1 to 20
21 to 24
25
26 to 28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64 to 67
68
69 to 80
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