Read Sony SRF-M73 Service Manual online
– 18 –
5-4.
IC PIN FUNCTION DESCRIPTION
•
Pin No.
Pin Name
I/O
Description
1
IF ON
O
Power on/off control signal output for the AM IF amplifier circuit “L”: power on
“L” is output when AM scan mode
“L” is output when AM scan mode
2
POWER
O
Power on/off control signal output for the radio system power supply “H”: power on
3
BAND
O
FM/AM band selection signal output terminal “L”: AM, “H”: FM
4
PULSE POWER
O
Power on/off control signal output for the pulse meter circuit “H”: power on
Not used (open)
Not used (open)
5
MUTE
O
Muting on/off control signal output to the headphone amplifier (IC3) “L”: muting on
6 to 9
KS0 to KS3
O
Key scan signal output for the key matrix
10 to 13
KR0 to KR3
I
Key return signal input for the key matrix
14
CK
O
Serial clock signal output to the EEPROM (IC105)
15
DATA
I/O
Two-way data bus with the EEPROM (IC105)
16
CS
O
Chip select signal output to the EEPROM (IC105)
17
AM IF IN
I
AM intermediate frequency detect signal input terminal
18
GND
—
Ground terminal
19
EO
O
PLL error signal output terminal
20
VCOL
I
AM VCO input terminal
21
VCOH
I
FM VCO input terminal
22
VREG1
—
Power supply terminal (connected to the coupling capacitor)
23
VDD
—
Power supply terminal (+3V)
24
XOUT
O
System clock output terminal (75 kHz)
25
XIN
I
System clock input terminal (75 kHz)
26
VREG2
—
Power supply terminal (connected to the coupling capacitor)
27
VLCD0
—
28
CAP0
—
29
CAP1
—
30
VLCD2
—
31 to 34
COM0 to COM3
O
Common drive signal output to the liquid crystal display (LCD101)
35 to 49
SEG0 to SEG14
O
Segment drive signal output to the liquid crystal display (LCD101)
50
CE
I
Power failure detection signal input from the voltage detect (IC102) Normally: “H”
51
PULSE IN
I
Pulse meter input terminal (detecting a falling edge) Not used (open)
52
BEEP
O
Beep sound drive signal output terminal
53
CMP IN
I
Scan stop detect signal input terminal
54 to 56
PB1 to PB3
I
Initialize signal input for the destination select (fixed at “L” in this set)
KEY BOARD IC101
µ
PD17073GB-556-1A7
(SYSTEM CONTROLLER, LIQUID CRYSTAL DISPLAY DRIVER, KEY CONTROL)
Terminal for doubler circuit capacitor connection to develop liquid crystal display drive voltage
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