SRF-M80 - Sony Audio Service Manual (repair manual)

Model
SRF-M80
Pages
17
Size
2.19 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
srf-m80.pdf
Date

View Sony SRF-M80 Service Manual online

SERVICE MANUAL
Time display 
 
24-hour system
Frequency range
Band
Frequency range
Channel step
FM
87.5-108 MHz
0.05 MHz
AM
531-1 602 kHz
9 kHz
530-1 610 kHz
10 kHz
Output
i
 
(headphones/earphones) jack (ø 3.5
mm, stereo minijack) 16 Ω
Power output
15 mW + 15 mW (at 10 % harmonic
distortion)
Power requirements
3 V DC, two R03 (size AAA) batteries
Dimensions
Approx. 69.2 × 45 × 113.5 mm (w/h/d)
(2 
3
/
4
 × 1 
13
/
16 
× 4 
1
/
2
 inches) incl.
projecting parts and controls
Mass
Approx. 104.2 g (3.68 oz.) incl. batteries
Supplied accessories
Stereo earphones (1)
Arm band (1)
Design and specifications are subject to
change without notice.
FM STEREO/AM PLL SYNTHESIZED RADIO
AEP Model
SPECIFICATIONS
SRF-M80
Ver 1.0  2002.04
9-873-678-01
Sony Corporation
2002D0500-1
Personal Audio Company
C
 2002.04
Published by Sony Engineering Corporation
2
SRF-M80
TABLE  OF  CONTENTS
1.
GENERAL
..................................................................
3
2.
DISASSEMBLY
2-1. Disassembly Flow ...........................................................
4
2-2. Cabinet (Front) Assy .......................................................
4
2-3. MAIN Board ...................................................................
5
3.
ELECTRICAL  ADJUSTMENTS
........................
6
4.
DIAGRAMS
4-1. Block Diagram ...............................................................
8
4-2. Note for Printed Wiring Board and
Schematic Diagrams .......................................................
9
4-3. IC Pin Function Description ..........................................
9
4-4. Printed Wiring Board  – MAIN Board – ....................... 10
4-5. Printed Wiring Board  – KEY Board – .......................... 11
4-6. Schematic Diagram  – MAIN/KEY Boards – ............... 12
5.
EXPLODED  VIEW
.................................................. 14
6.
ELECTRICAL  PARTS  LIST
.............................. 15
Notes on chip component replacement
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be dam-
aged by heat.
3
SRF-M80
SECTION  1
GENERAL
This section is extracted from
instruction manual.
HOLD lever
Levier HOLD
Palanca
HOLD
BAND
SPLIT/RESET
START/STOP
POWER
ENTER
FM SENS DX/LOCAL
Belt clip
Attache
Pinza de la correa
PRESET TUNING 1 – 6*
2
TUNE/TIME
SET +/–*
2
VOL*
3
MODE
MEGA BASS
i
 (headphones/earphones)
jack
Prise 
i (casque/écouteurs)
Toma  
i (auriculares/
audífonos)
*
3
There is a tactile dot beside
volume to show the direction
to turn up the volume.
*
3
Un point tactile se trouve à
côté de la molette du volume
afin d’indiquer le sens
permettant d’augmenter ce
dernier.
*
3
Al lado del botón del volumen
hay un punto táctil que
muestra el sentido en que se
debe girar para subir el
volumen.
*
2
The TUNE/TIME SET + and the PRESET
TUNING 3 buttons have a tactile dot.
*
2
La touche de TUNE/TIME SET + et
PRESET TUNING 3 comporte un point
tactile.
*
2
Las teclas TUNE/TIME SET + y PRESET
TUNING 3 tienen un punto táctil.
Display window*
1
Afficheur*
1
Ventana del visualizador*
1
*
1
The display differs depending on your
country.
*
1
L’affichage diffère selon votre pays.
*
1
El visualizador varía en función del país.
Features
• FM/AM 2 band PLL (phase locked loop)
synthesized armband radio.
• Easy Preset Digital Tuning with 18
memory presets.
• 6 direct presets calls.
• Stopwatch, split and pitch timer functions.
• Wearable round design for armband and
belt-holder use.
• Splash-resistant for all –weather use.
• MEGA BASS for dynamic bass sound.
Notes on AM Channel Step
The AM channel step differs depending on
areas.  See “Changing AM Channel Step”.
Setting the Clock
The display will flash “AM 12:00” or
“0:00” when the batteries are first
inserted.
1
Press MODE repeatedly to
select the clock mode when
the clock mode is not on.
2
Hold down ENTER for more
than 2 seconds.
The beep sounds and the hour flashes in
the display.
3
Press TUNE/TIME SET + or
 until the correct hour
appears in the display.
Each press changes the digit(s) by one.
When you keep the button pressed, the
digit(s) change rapidly.
4
Press ENTER.
The beep sounds and the minute starts to
flash.
Repeat step 3 to set the minute. After
setting the minute, press ENTER again.
The two beeps sound and the clock starts
from 0 seconds.
The clock system varies depending on the
model you own.
12-hour system: “AM 12:00” = midnight
24-hour system: “0:00” = midnight
SRF-M80
4
Note:
 Follow the disassembly procedure in the numerical order given.
2-2.
CABINET (FRONT)  ASSY
• This set can be disassembled in the order shown below.
2-1.
DISASSEMBLY  FLOW
SECTION  2
DISASSEMBLY
2-2. Cabinet (Front) Assy
 
(Page 4)
2-3. MAIN Board
(Page 5)
SET
2
five screws
(B1.7 
×
 6)
1
Open the battery case lid.
4
3
two claws
5
rubber key switch
(preset)
6
cabinet (front) assy
adaptor (hold)
key board
S117
Note: When installing the cabinet (front) assy, adjust S117 and the adaptor (hold).
SRF-M80
5
2-3.
MAIN  BOARD
Note: When installing the main board, adjust S1 and the adaptor (sens).
5
claw
adaptor (sens)
5
claw
6
main board
S1
3
holder (H/P)
key board
4
Remove two solders.
2
screw
(B1.7 
×
 6)
1
knob (vol)
6
SRF-M80
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter
RV1
999 kHz
AM VCO VOLTAGE ADJUSTMENT
Adjustment Part
Frequency Display
Reading on Digital Voltmeter
L2
531 kHz
2.5 
± 0.1 V
Confirmation
1602 kHz
8.6 
± 0.3 V
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L1
621 kHz
CT1
1,404 kHz
FM VCO VOLTAGE CONFIRMATION
Frequency Display
Reading on Digital Voltmeter
87.5 MHz
8.3 
± 0.3 V
108 MHz
13.6 
± 0.3 V
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L3
98.0 MHz
Adjustment Location: MAIN board (See page 7)
FM STEREO ADJUSTMENT
Setting:
BAND button: FM
1. Connect the frequency counter to TP (FM ST) and TP (+B) as
shown the figure below.
2. Tune the set to 87.5 MHz.
3. Adjust RV2 for 75.9 to 76.1 kHz reading on the frequency
counter.
Adjustment Location: MAIN board (See page 7)
0 dB=1 
µ
V
[AM]
Setting:
BAND button : AM
[FM/TV]
Setting:
BAND button: FM
• Repeat the procedures in each adjustment several times, and the
tracking adjustments should be finally done by the trimmer ca-
pacitors.
• Remove FM antenna in FM adjustment.
AM RF signal 
generator
30% amplitude
modulation by
400 Hz signal
Output level: 
as low as possible
Put the lead-wire
antenna close to 
the set.
+
level meter
set
16 
i
 jack (J1)
digital voltmeter
TP (VT)
TP (FM GND)
100 k
MAIN board
SECTION  3
ELECTRICAL  ADJUSTMENTS
set
MAIN board
TP (FM IN)
MAIN board
TP (FM GND)
0.01 
µ
F
Carrier frequency : 87.5 MHz
Modulation
: no modulation
Output level
: 0.1 V (100 dB)
FM RF SSG
33 k
+
+
MAIN board
TP (FM ST)
TP (+B)
TP (FM GND)
frequency counter
µ
F/50 V
digital voltmeter
TP (VT)
TP (AM GND)
100 k
MAIN board
FM RF signal
generator
22.5 kHz frequency
deviation by 400 Hz
signal
Output level: 
as low as possible
+
level meter
i
 jack (J1)
set
MAIN board
TP (FM IN)
MAIN board
TP (FM GND)
16 
0.01 
µ
F
SRF-M80
7
7
Adjustment Location:
– MAIN BOARD (Component Side) –
AM Tracking Adjustment
RV1
AM IF Adjustment
RV2
FM Stereo Adjustment
L3
FM Tracking Adjustment
L2
AM VCO Voltage Adjustment
CT1
L1


TP
(AM GND)
TP
(FM GND)
TP
(FM ST)
TP
(FM IN)
TP
(+B)
TP
(VT)
– MAIN BOARD (Conductor Side) –
SRF-M80
8
8
BASS
BOOST
CONTROL
POWER
AMP
DET
BASS BOOST AMP
IC2
SYSTEM CONTROLLER
IC101
2
1
13
14
S1
FM SENS
B.P.F.
BPF1
LIQUID CRYSTAL DISPLAY
LCD101
VOLTAGE
DETECT
IC102
B+ SWITCH
Q6
DC/DC
CONVERTER
Q104, T101
POWER
AMP
MUTE
CONTROL
RIPPLE FILTER
Q5
KEY MATRIX
S101 – 115
KS0 – KS3
KR0 – KR3
X101
75kHz
SYSTEM CONTROLLER (IC101) B+
FM/AM RF AMP (IC1),
HEADPHONE AMP (IC3) B+
BASS BOOST AMP (IC2) B+
PLL LOW-PASS FILTER CIRCUIT B+
D102
–1
–2
IN2
IN1
HEADPHONE AMP
IC3
2
4
IN1
IN2
OUT2
OUT1
9
7
OUT1
OUT2
LP
GAIN
POWER
XOUT
XIN
CE
BA
TT LOW
DET
IN
MUTE SW
VCOL
VCOH
BAND1
24
HOLD
51
25
1
50
VOLTAGE
DETECT
IC103
53
6
12
10
MUTE
5
M/BASS
4
BEEP
52
16
21
AMP
15
20
EO
19
DX
LOCAL
RV3
VOL
J1
(HEADPHONE)
i
+
DRY BATTERY
SIZE “AAA”
(IEC DESIGNATION R03)
2PCS. 3V
10 – 13
6 – 9
COM0 – COM3
31 – 34
SEG0 – SEG14
35 – 49
25
22
16
18
17
FM
RF AMP
FM
LPF
MPX
DECODER
FM
OSC
AM/FM: 1/2
FMIN
MPXI
ARFI
150kHz
DETO
45kHz
FMRO
AMLO
FTLO
29
IFCT
12
BAND
1
VCO
FM/AM RF AMP,
MIX, OSC, DET, MPX
IC1
AM
OSC
FM
LMT
FM
DET
AGC
AMP
AM
BPF
19
REGV
FMBF
AM
RF AMP
26
+
+
35
LOUT
3
ROUT
4
36
PSN
REGULATOR
VCO
RV2
FM STEREO
 RV1
AM IF
L3
CT1, L1
L3
FM RF
AM TRACKING
L1
AM
FERRITE-ROD
ANTENNA
L2
AM OSC
L5
FM OSC
CT1
D3
D2
(1/2)
D2 (2/2)
D5
AM VCO
VOLTAGE
FM TRACKING
BASS BOOST
SWITCH
Q4
LOW-PASS
FILTER
Q101
FM VCO
AMP
Q103
B+
FM VCO
BUFFER
Q1, 102
S117
HOLD
ON
OFF
: FM
: AM
• SIGNAL PATH
SECTION  4
DIAGRAMS
4-1.
BLOCK  DIAGRAM
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
SRF-M80
10
10
MAIN BOARD
(COMPONENT SIDE)
(11)
11
1-683-951-
BLK
RED
NATURAL
L1
AM
FERRITE-ROD
ANTENNA
C25
R17
C27
R18
C23
C21
C22
C26
R19
C31
C30
C32
R20
C33
R39
Q5
BC
E
EC
B
Q1
Q6
R26
C42
C64
R14
R10
C18
C9
C66
R2
D3
K
A
R7
C12
R13
A
K
D5
C10
R11
C16
C17
L5
C19
C20
R43
R42
R27
R15
R28
R29
R37
R41
R40
C47
C45
L7
L6
L8
C56
C57
R36
C48
R32
R30
C50
R33
R34
C54
C55
C1
C40
R4
R1
R21
R22
C37
C36
R23
R24
C38
C65
C2
C39
R25
C61
EC
B
Q4
R3
R5
C4
C60
C5
C3
A
K
A
D2
C68
IC2
IC3
IC1
R35
1
12
C28
+
C24
+
C29
+
C34
+
BPF1
+
C8
RV1
RV2
L3
FM RF
L2
AM OSC
CT1
+
C41
+
C51
+
C52
+
C53
+
C58
+
C46
+
C49
+
C15
+
C44
J1
MAIN BOARD
(CONDUCTOR SIDE)
(11)
11
1-683-951-
S1
DX t LOCAL
FM SENS
A
KEY BOARD
DRY BATTERY
SIXE “AAA”
(ICE DESIGNATION RO3)
2PCS. 3V
-1
-2
i
VOL
RV3
1
5
10
6
9
8
16
1
TP
(AM GND)
TP
(FM ST)
TP
(VT)
TP
(FM GND)
TP
(FM IN)
3
1
21
20
11
10
1
40
31
30
2E
2B
1C
2C
1B
1E
TP
(B+)
A
B
C
D
E
1
2
3
4
5
6
7
8
9
R38
4-4.
PRINTED  WIRING  BOARD  – MAIN Board –
• Semiconductor
Location
Ref. No.
Location
D2
E-8
D3
D-8
D5
D-8
IC1
C-8
IC2
D-7
IC3
B-6
Q1
C-7
Q4
E-7
Q5
D-6
Q6
B-7
(Page 11)

Download Sony SRF-M80 Service Manual (Repair Manual)

Here you can view online and download Sony SRF-M80 Service Manual in PDF. SRF-M80 service manual will guide through the process and help you recover, restore, fix, disassemble and repair Sony SRF-M80 Audio. Information contained in service manuals typically includes schematics / circuit diagrams, wiring diagrams, block diagrams, printed wiring boards, exploded views, parts list, disassembly / assembly, pcb.