Sony SRF-M80 Service Manual ▷ View online
3
SRF-M80
SECTION 1
GENERAL
This section is extracted from
instruction manual.
instruction manual.
HOLD lever
Levier HOLD
Palanca
HOLD
Levier HOLD
Palanca
HOLD
BAND
SPLIT/RESET
START/STOP
POWER
ENTER
FM SENS DX/LOCAL
Belt clip
Attache
Pinza de la correa
Attache
Pinza de la correa
PRESET TUNING 1 – 6*
2
TUNE/TIME
SET +/–*
SET +/–*
2
VOL*
3
MODE
MEGA BASS
i
(headphones/earphones)
jack
Prise i (casque/écouteurs)
Toma i (auriculares/
audífonos)
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.
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.
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.
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.
TUNING 3 buttons have a tactile dot.
*
2
La touche de TUNE/TIME SET + et
PRESET TUNING 3 comporte un point
tactile.
PRESET TUNING 3 comporte un point
tactile.
*
2
Las teclas TUNE/TIME SET + y PRESET
TUNING 3 tienen un punto táctil.
TUNING 3 tienen un punto táctil.
Display window*
1
Afficheur*
1
Ventana del visualizador*
1
*
1
The display differs depending on your
country.
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
• 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.
• MEGA BASS for dynamic bass sound.
Notes on AM Channel Step
The AM channel step differs depending on
areas. See “Changing AM Channel Step”.
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.
“0:00” when the batteries are first
inserted.
1
Press MODE repeatedly to
select the clock mode when
the clock mode is not on.
select the clock mode when
the clock mode is not on.
2
Hold down ENTER for more
than 2 seconds.
than 2 seconds.
The beep sounds and the hour flashes in
the display.
the display.
3
Press TUNE/TIME SET + or
– until the correct hour
appears in the display.
– 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.
When you keep the button pressed, the
digit(s) change rapidly.
4
Press ENTER.
The beep sounds and the minute starts to
flash.
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.
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
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
(B1.7
×
6)
1
Open the battery case lid.
4
3
two claws
5
rubber key switch
(preset)
(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
(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
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
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
BAND button : AM
[FM/TV]
Setting:
BAND button: FM
BAND button: FM
• Repeat the procedures in each adjustment several times, and the
tracking adjustments should be finally done by the trimmer ca-
pacitors.
pacitors.
• Remove FM antenna in FM adjustment.
AM RF signal
generator
30% amplitude
modulation by
400 Hz signal
Output level:
as low as possible
modulation by
400 Hz signal
Output level:
as low as possible
Put the lead-wire
antenna close to
the set.
antenna close to
the set.
+
–
–
level meter
set
16
Ω
i
jack (J1)
digital voltmeter
TP (VT)
TP (FM GND)
100 k
Ω
MAIN board
SECTION 3
ELECTRICAL ADJUSTMENTS
set
MAIN board
TP (FM IN)
TP (FM IN)
MAIN board
TP (FM GND)
TP (FM GND)
0.01
µ
F
Carrier frequency : 87.5 MHz
Modulation
Modulation
: no modulation
Output level
: 0.1 V (100 dB)
FM RF SSG
33 k
Ω
+
+
–
–
MAIN board
TP (FM ST)
TP (+B)
TP (FM GND)
frequency counter
1
µ
F/50 V
digital voltmeter
TP (VT)
TP (AM GND)
100 k
Ω
MAIN board
FM RF signal
generator
22.5 kHz frequency
deviation by 400 Hz
signal
Output level:
as low as possible
deviation by 400 Hz
signal
Output level:
as low as possible
+
–
–
level meter
i
jack (J1)
set
MAIN board
TP (FM IN)
TP (FM IN)
MAIN board
TP (FM GND)
TP (FM GND)
16
Ω
0.01
µ
F
