Read Sony SRF-M80 Service Manual online
SRF-M80
9
9
4-2.
NOTE FOR PRINTED WIRING BOARD AND SCHEMATIC DIAGRAMS
Caution:
Pattern face side:
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
• All capacitors are in
µ
F unless otherwise noted. pF:
µµ
F
50 WV or less are not indicated except for electrolytics
and tantalums.
and tantalums.
• All resistors are in
Ω
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
(
no mark : FM
(
) : AM
• Voltages are taken with a VOM (Input impedance 10 M
Ω
).
Voltage variations may be noted due to normal produc-
tion tolerances.
tion tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
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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