Sony SRF-PSY04 Service Manual ▷ View online
SRF-PSY04
– 11 –
– 12 –
Note on Schematic Diagram:
• All capacitors are in µF unless otherwise noted. pF: µµF
• All capacitors are in µF unless otherwise noted. pF: µµF
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.
•
¢
: internal component.
•
C
: panel designation.
•
U
: 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.
4-3.
SCHEMATIC DIAGRAM
•
See page 13 for Waveforms.
•
See page 14 for IC Block Diagrams.
no mark : FM
(
(
) : AM
〈〈
〉〉
: POWER OFF
• Voltages are taken with a VOM (Input impedance 10 M
Ω
).
Voltage variations may be noted due to normal production toler-
ances.
ances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal production toler-
ances.
ances.
• Circled numbers refer to waveforms.
• Signal path.
• Signal path.
F
: FM
f
: AM
– 13 –
– 14 –
• Waveforms
– KEY Board –
– KEY Board –
1
IC101
!™
XOUT
500 mV/DIV, 10 µs/DIV
2
IC101
!£
XIN
500 mV/DIV, 10 µs/DIV
3
T101
10 V/DIV, 200 ns/DIV
10 V/DIV, 200 ns/DIV
4
Q106 Collector
2 V/DIV, 200 ns/DIV
2 V/DIV, 200 ns/DIV
5
Q106 Base, Q107 Collector
200 mV/DIV, 200 ns/DIV
200 mV/DIV, 200 ns/DIV
1.2 Vp-p
13.3
µ
s
2 Vp-p
13.3
µ
s
34 Vp-p
424 ns
5.2 Vp-p
320 ns
616 mVp-p
320 ns
• IC Block Diagrams
– MAIN Board –
– MAIN Board –
IC1
CXA1238M-T6
VCO
REGULATOR
FM FRONT-END
AM FRONT-END
MPX
REGULATOR
MONO/STEREO
SELECT
DECORD
AMP
MUTING
AUTO
BLEND
TUNING
INDICATOR
AM IF/
DET
FM IF/
DISCRI
RIPPLE
FILTER
BAND-PASS
MUTE
1
27
28
29
30
24
25
26
21
22
23
18
19
20
16
17
2
3
4
5
6
7
8
9
PLL LPF1
PILOT DET LPF2
PILOT DET LPF2
ST IND/VCO CHECK
L-CH OUT
VCC
R-CH OUT
RIPPLE FILTER
AGC AFC1
10
AGC AFC2
13
FM IF IN
14
AM IF IN
15
BAND SELECT
11
GND
12
TUNE IND
1/2
COUNTER
1/2
COUNTER
PD1
PD2
FM/AM FE OUT
FM GND
FM RF IN
AM RF IN
FM RF
REG
FM OSC
AFC
AM OSC
MUTE
FM DISCRI
GND
PLL LPF2
MPX REG
VCO
IC2
LA4533M
MT/SW
OUT1
POWER GND
OUT2
VCC
P/SW
IN1
PRE GND
IN2
REF
1
2
3
4
5
10
9
8
7
6
POWER
AMP
POWER
AMP
MUTE
CONTROL
POWER
SWITCH
BIAS
– 15 –
4-4.
IC PIN FUNCTION DESCRIPTION
•
Pin No.
Pin Name
I/O
Description
1
PB2
I
Key return signal input for the key matrix
2 to 5
PC0 to PC3
O
Key scan signal output for the key matrix
6
BEEP
O
Beep sound drive signal output terminal
7
BAND
O
FM/AM band selection signal output terminal “L”: FM, “H”: AM
8
BCHK
—
Not used (open)
9
POWER
O
Power on/off control signal output for the radio system power supply “H”: power on
10
MUTE
O
Muting on/off control signal output to the headphone amplifier (IC2) “L”: muting on
11
CE
I
Power failure detection signal input from the voltage detect (IC102) Normally: “H”
12
XOUT
O
System clock output terminal (75 kHz)
13
XIN
I
System clock input terminal (75 kHz)
14
VDD
—
Power supply terminal (+3V)
15
GND
—
Ground terminal
16
EO
O
PLL error signal output terminal
17
VREG
—
Power supply terminal (connected to the coupling capacitor)
18
VCOH
I
FM VCO input terminal
19
VCOL
I
AM VCO input terminal
20 to 28
LCD8 to LCD0
O
Segment drive signal output to the liquid crystal display (LCD101)
29 to 32
COM3 to COM0
O
Common drive signal output to the liquid crystal display (LCD101)
33
VLCD1
—
34
C1
—
35
C0
—
36
VLCD0
—
37, 38
PB0, PB1
I
Key return signal input for the key matrix
KEY BOARD IC101
µ
PD17015GS-520-GJG
(SYSTEM CONTROLLER, LIQUID CRYSTAL DISPLAY DRIVER, KEY CONTROL)
Terminal for doubler circuit capacitor connection to develop liquid crystal display drive voltage
– 16 –
SECTION 5
EXPLODED VIEW
• Items marked “*” are not stocked since they
are seldom required for routine service. Some
delay should be anticipated when ordering
these items.
delay should be anticipated when ordering
these items.
• The mechanical parts with no reference num-
ber in the exploded views are not supplied.
• Accessories and packing materials are given
in the last of the electrical parts list.
NOTE:
• -XX and -X mean standardized parts, so they
may have some difference from the original
one.
one.
• Color Indication of Appearance Parts
Example:
KNOB, BALANCE (WHITE) . . . (RED)
KNOB, BALANCE (WHITE) . . . (RED)
↑
↑
Parts Color Cabinet's Color
Ref. No.
Part No.
Description
Remark
Ref. No.
Part No.
Description
Remark
1
3-925-196-21 CABINET (REAR) (BLUE)
1
3-925-196-31 CABINET (REAR) (VIOLET)
2
A-3679-692-A MAIN BOARD, COMPLETE
3
3-925-201-01 SPRING (+), BATTERY
4
3-925-198-11 PLATE, TRANSPARENT (for BLUE)
4
3-925-198-21 PLATE, TRANSPARENT (for VIOLET)
5
3-925-195-11 CABINET (FRONT) (BLUE)
5
3-925-195-21 CABINET (FRONT) (VIOLET)
6
1-762-412-21 SWITCH, RUBBER KEY (BLUE)...(VIOLET)
6
1-762-412-31 SWITCH, RUBBER KEY (VIOLET)...(BLUE)
7
3-925-192-01 SPRING (–), BATTERY
8
A-3679-693-A KEY BOARD, COMPLETE
9
3-925-197-11 LID, BATTERY CASE (BLUE)
9
3-925-197-21 LID, BATTERY CASE (VIOLET)
10
3-925-193-01 SPRING (+/–), BATTERY
11
7-685-105-14 TAPPING +P 2X8 NON-SLIT
12
3-037-724-01 GUARD (YELLOW)... (BLUE)
12
3-037-724-11 GUARD (BLUE)... (VIOLET)
13
3-028-093-01 CLIP
14
3-036-709-01 CHAIN
4
5
6
3
7
8
2
1
11
9
14
10
12
13
not supplied
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