Read Sony ICF-M770L / ICF-M770S / ICF-M770SL Service Manual online
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
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
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.
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-
• 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.
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.
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