ICF-M770L, ICF-M770S, ICF-M770SL - Sony Audio Service Manual (repair manual)

Model
ICF-M770L ICF-M770S ICF-M770SL
Pages
22
Size
1.08 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
icf-m770l-icf-m770s-icf-m770sl.pdf
Date

View Sony ICF-M770L / ICF-M770S / ICF-M770SL Service Manual online

SERVICE MANUAL
ICF-M770L
FM/MW/LW PLL SYNTHESIZED
ICF-M770S
FM/SW/MW PLL SYNTHESIZED
ICF-M770SL
FM/SW/LW PLL SYNTHESIZED
AEP Model
ICF-M770L/M770SL
UK Model
ICF-M770L
Italian Model
East European Model
ICF-M770S
SPECIFICATIONS
ICF-M770L/M770S/M770SL
Ver 1.1  2002.06
9-873-657-02
Sony Corporation
2002F0500-1
Personal Audio Company
C
 2002.06
Published by Sony Engineering Corporation
Photo: ICF-M770SL
Time display: 24-hour system
Frequency range:
Band
ICF-M770L ICF-M770S
ICF-M770SL
Channel
step
FM
87.5 –
87.5 –
87.5 –
0.05 MHz
108 MHz
108 MHz
108 MHz
SW
5 800 –
5 800 –
5 kHz
15 900 kHz
15 900 kHz
MW
531 –
531 –
9 kHz
1 602 kHz 1 602 kHz
LW
153 –
153 –
9 kHz
279 kHz
279 kHz
Speaker: 12 cm (4
3
4
 inches), 8 Ω
Power output: 350 mW (at 10% harmonic
distortion)
Output: 
v (earphone) jack (ø 3.5 mm minijack)
Power requirements:
220–230 V AC, 50Hz
6 V DC, four R20 (size D) batteries
Dimensions:
Approx. 277 × 156 × 71.5 mm (w/h/d)
(Approx. 11 × 6
1
4
 ×
 
2
7
8
 inches) incl. projecting
parts and controls
Mass: Approx. 1 540 g (3lb 6
 
oz
 
) incl. batteries
Supplied accessories: AC power cord (1)
Design and specifications are subject to change
without notice.
2
ICF-M770L/M770S/M770SL
CF2
CF3
mark
TABLE  OF  CONTENTS
1.
SERVICING  NOTE
.................................................
2
2.
GENERAL
..................................................................
3
3.
DISASSEMBLY
3-1. Disassembly Flow ...........................................................
4
3-2. Cabinet Rear Assy ...........................................................
4
3-3. Chassis Assy ....................................................................
5
3-4. MAIN Board ...................................................................
5
4.
ELECTRICAL  ADJUSTMENTS
........................
6
5.
DIAGRAMS
5-1. Block Diagram ...............................................................
8
5-2. Note for Printed Wiring Boards and
Schematic Diagrams .......................................................
9
5-3. Printed Wiring Boards
– MAIN/JACK/POWER/INLET Boards – .................... 10
5-4. Schematic Diagram
– MAIN/JACK/POWER/INLET Boards – .................... 11
5-5. Printed Wiring Board  – KEY Board – .......................... 12
5-6. Schematic Diagram  – KEY Board – ............................ 13
5-7. IC Pin Function Description .......................................... 14
6.
EXPLODED  VIEWS
6-1. Cabinet (Front) Section ................................................... 15
6-2. Cabinet (Rear) Section .................................................... 16
6-3. Chassis Section ............................................................... 17
7.
ELECTRICAL  PARTS  LIST
.............................. 18
SAFETY-RELATED  COMPONENT  WARNING!!
COMPONENTS  IDENTIFIED  BY  MARK  
0
  OR  DOTTED
LINE  WITH  MARK  
0
  ON  THE  SCHEMATIC  DIAGRAMS
AND  IN  THE  PARTS  LIST  ARE  CRITICAL  TO  SAFE
OPERATION.  REPLACE  THESE  COMPONENTS  WITH
SONY  PARTS  WHOSE  PART  NUMBERS  APPEAR  AS
SHOWN  IN  THIS  MANUAL  OR  IN  SUPPLEMENTS  PUB-
LISHED  BY  SONY.
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.
SECTION  1
SERVICING  NOTE
Mark
Center frequency
red
10.70 MHz
blue
10.67 MHz
orange
10.73 MHz
black
10.64 MHz
white
10.76 MHz
HOW  TO  CHANGED  THE  CERAMIC  FILTERS
This model is used two ceramic filters of CF2 and CF3.
You must use same type of color marked ceramic filters in order to
meet same specifications.
Therefore, the ceramic filter must be changed two pieces together
since it’s supply two pieces in one package as a spare parts.
3
ICF-M770L/M770S/M770SL
SECTION  2
GENERAL
This section is extracted from
instruction manual.
A
Rear
Arrière
Rückseite
Parte posterior
Achterkant
R20 (size D) 
×
 4
R20 (D) 
×
 4
R20 (Größe D) 
×
 4
R20 (tamaño D) 
×
 4
R20 (D) 
×
 4
Insert 
E side of the battery first.
Insérez la borne 
E de la pile en premier.
Legen Sie die Batterien mit dem Minuspol
E zuerst ein.
Inserte primero el lado 
E de la pila.
Breng de 
E kant van de batterij eerst in.
B
To AC IN
Vers AC IN
An AC IN
A AC IN
Naar AC IN
To a wall outlet
Vers une prise murale
An eine Netzsteckdose
A la toma de pared
Naar een stopcontact
AC power cord
Cordon d’alimentation secteur
Netzkabel
Cable de alimentación de CA
Netsnoer
HOLD
OPERATION
LIGHT
mb/CLOCK TIME SET ON/OFF
SLEEP
SCAN
STANDBY
TUNE/
TIME
SET
VOL
TONE
BAND
1
2
3
4
5
6
7
PRESET TUNING
  STATION    SELECT/     PRESET
v jack
Prise 
v
Buchse 
v
Toma 
v
v aansluiting
Telescopic Antenna
Antenne télescopique
Teleskopantenne
Antena telescópica
Telescoopantenne
TUNE/TIME SET
VOL
TONE
C
FM
SW
MW/LW
CLOCK for ICF-M770L
CLOCK pour ICF-M770L
CLOCK beim ICF-M770L
CLOCK para ICF-M770L
CLOCK voor ICF-M770L
* The PRESET TUNING 4 button has a
tactile dot.
* La touche PRESET TUNING 4 a un point
tactile.
* Auf der PRESET TUNING-Taste 4
befindet sich ein fühlbarer Punkt.
* La tecla PRESET TUNING 4 tiene un
punto táctil.
* De PRESET TUNING 4 toets is voorzien
van een voelstip.
*
Setting the Clock
“0:00” will flash in the display when the batteries
are installed or the AC power cord is plugged in
for the first time.
The clock can be adjusted only when the radio is
turned off.
1
Press mb/CLOCK (CLOCK for ICF-
M770L) for more than 2 seconds.
The “hour” starts flashing.
2
Turn TUNE/TIME SET to set the hour for
the current time, then press mb/CLOCK
(CLOCK for ICF-M770L).
The “minute” starts flashing.
3
Turn TUNE/TIME SET to set the minute
for the current time, then press mb/
CLOCK
 (CLOCK for ICF-M770L).
The clock starts operating, and “:” starts flashing.
To set the current time exactly to the second, adjust
the minute and then press mb/CLOCK (CLOCK for
ICF-M770L) to synchronize with a time signal (such
as the telephone time signal).
How to Adjust the Time Digits
When you turn TUNE/TIME SET to   or  , the
time digits move forward or backward by one step,
and when you turn it to   or  , the time digits
move rapidly.
Notes
• If you do not operate mb/CLOCK (CLOCK for ICF-
M770L) or TUNE/TIME SET within 65 seconds,
the clock setting mode will be cancelled.
• 24-hour system : “0:00” = midnight, “12:00” = noon
Using the Backlight Function
Press LIGHT to turn on the backlight.
To turn off the backlight, press LIGHT again.
When operating the unit on batteries
The backlight will turn off automatically after 30
seconds to save the batteries. However, if you
operate the radio while the backlight is lit, it will
stay on for another 30 seconds.
To turn off the backlight before the time has
elapsed, press LIGHT.
ICF-M770L/M770S/M770SL
4
• This set can be disassembled in the order shown below.
3-1.
DISASSEMBLY  FLOW
SECTION  3
DISASSEMBLY
Note:
 Follow the disassembly procedure in the numerical order given.
3-2.
CABINET (REAR)  ASSY
3
telescopic antenna (ANT1)
2
screw (P3 
×
 10)
1
six screws
(BTP3 
×
 14)
6
cabinet (rear) assy
5
Remove five solders.
4
main board
main board
SET
3-2. CABINET (REAR) ASSY
(page 4)
3-4. MAIN BOARD
(page 5)
3-3. CHASSIS ASSY
(page 5)

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Here you can view online and download Sony ICF-M770L / ICF-M770S / ICF-M770SL Service Manual in PDF. ICF-M770L / ICF-M770S / ICF-M770SL service manual will guide through the process and help you recover, restore, fix, disassemble and repair Sony ICF-M770L / ICF-M770S / ICF-M770SL 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.