SRF-M80 - Sony Audio Service Manual (repair manual). Page 9

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SRF-M80
9
9
4-2.
NOTE  FOR  PRINTED  WIRING  BOARD  AND  SCHEMATIC  DIAGRAMS
Caution:
Pattern face side:
Parts on the pattern face side seen from
(Conductor Side)
the pattern face are indicated.
Parts face side:
Parts on the parts face side seen from
(Component Side)
the parts face are indicated.
Note on Printed Wiring Boards:
X
: parts extracted from the component side.
Y
: parts extracted from the conductor side.
W
: indicates side identified with part number.
z
: Through hole.
: Pattern from the side which enables seeing.
(The other layers' patterns are not indicated.)
Note on Schematic Diagram:
• All capacitors are in 
µ
F unless otherwise noted.  pF: 
µµ
F
50 WV or less are not indicated except for electrolytics
and tantalums.
• All resistors are in 
 and 
1
/
4
 
W or less unless otherwise
specified.
C
: panel designation.
A
: B+ Line.
H
: adjustment for repair.
• Power voltage is dc 3 V and fed with regulated dc power
supply from battery terminal.
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
no mark : FM
(
) : AM
• Voltages are taken with a VOM (Input impedance 10 M
).
Voltage variations may be noted due to normal produc-
tion tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
• Circled numbers refer to waveforms.
• Signal path.
F
: FM
f
: AM
• Waveforms
1
IC101 
wf
 (XOUT)
2
Q104 Base-1, Collector-2
1.5 Vp-p
13.3 
µ
s
340 mVp-p
252 ns
3
Q104 Collector-1
2.9 Vp-p
252 ns
4-3.
IC  PIN  FUNCTION  DESCRIPTION
• 
KEY BOARD  IC101  
µ
PD17073GB-556-1A7 (SYSTEM CONTROLLER)
Pin No.
Pin Name
I/O
Description
1
POWER
O
Power on/off control signal output for the radio system power supply    “H”: power on
2, 3
NC
O
Not used
4
M/BASS
O
MEGA BASS on/off control signal output    “H”: MEGA BASS on
5
MUTE
O
Muting on/off control signal output to the headphone amplifier    “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
NC
O
Not used
15
AMP
O
FM VCO amplifier power on/off control signal output terminal    “L”: FM VCO amplifier on
16
BAND
O
FM/AM band selection signal output terminal    “L”: AM, “H”: FM
17
NC
O
Not used
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
VREG0
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
VREG1
Power supply terminal (connected to the coupling capacitor)
27
VLCD0
28
CAP0
29
CAPS1
30
VLCD1
31 to 34
COM0 to COM3
O
Common drive signal output to the liquid crystal display
35 to 49
LCD0 to LCD14
O
Segment drive signal output to the liquid crystal display
50
CE
I
Power failure detection signal input from the voltage detect    Normally: “H”
51
HOLD
I
Key input terminal
52
BEEP
O
Beep sound drive signal output terminal
53
BATT LOW
I
Battery voltage detection signal input from the voltage detect    Normally: “H”
54
NC
O
Not used
55, 56
PB1, PB2
I
Initialize signal input for the destination select
Terminal for doubler circuit capacitor connection to develop liquid crystal display drive voltage
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