Sony icf m 770 l service manual

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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 its supply two pieces in one package as a spare parts.