SONY SRF-M73 free download

File name SRF-M73.pdf

SRF-M73 SERVICE MANUAL Ver 1.0 1999. 03 US Model Panama Model SPECIFICATIONS FM STEREO/AM PLL SYNTHESIZED RADIO MICROFILM SECTION 1 SERVICING NOTES TABLE OF CONTENTS 1. 2. 3. 4. 5. 5-1. 5-2. 5-3. 5-4. Forced Reset The system microprocessor can be reset in the following procedure. Use these procedure when the unit cannot be worked normally due to the overrunning of the microprocessor, etc. Procedure: 1. Set to radio OFF. 2. While pressing the [SCAN] button, press two buttons of [START/ STOP] and [BAND] simultaneously for 5 seconds. 3. The unit is reset, and display blinking "AM 12:00". SERVICING NOTES ... 2 GENERAL ... 3 DISASSEMBLY ... 4 ELECTRICAL ADJUSTMENTS ... 6 DIAGRAMS Block Diagram ... Printed Wiring Boards ... Schematic Diagram ... IC Pin Function Description ... 8 10 13 18 6. 7. EXPLODED VIEWS ... 19 ELECTRICAL PARTS LIST ... 20 ­2­ SECTION 2 GENERAL This section is extracted from instruction manual. ­3­ SECTION 3 DISASSEMBLY · This set can be disassembled in the order shown below. Set Cabinet (Front) Assy Cabinet (Rear) Assy Key Board Main Board Knob (A) Note: Follow the disassembly procedure in the numerical order given. CABINET (FRONT)/(REAR) ASSY 2 three screws (B1.7 Ч 8) 1 Remove the battery case lid of the arrow. 2 two screws (B1.7 Ч 8) 4 cabinet (rear) assy 3 cabinet (front) assy KEY BOARD 1 three claws 2 Open the key board to direction of the arrow. 1 four claws ­4­ MAIN BOARD Note: Check that two switch (S1, S2) is latched with two adaptors when carrying out installation. 3 knob (vol) 5 main board 4 two claws S2 S1 2 screw (B1.7 Ч 8) 1 Remove two solders. KNOB (A) 2 two knobs (A) 1 claw 1 claw 3 two adaptors ­5­ SECTION 4 ELECTRICAL ADJUSTMENTS 0 dB = 1 µV [AM] Setting: Band switch: AM AM RF signal generator Put the lead-wire antenna close to the set. 32 set 30% amplitude 2 jack (J1) modulation by 400 Hz signal Output level: as low as possible + ­ level meter T1 AM IF ADJUSTMENT Adjust for a maximum reading on level meter 450 kHz AM VCO VOLTAGE ADJUSTMENT Adjustment Part L4 Confirmation Frequency Display 530 kHz (531 kHz) 1710 kHz (1602 kHz) Reading on Digital Voltmeter 3 ± 0.1V 9 ± 1V (8.5 ± 1V) AM TRACKING ADJUSTMENT Adjust for a maximum reading on level meter L1 CT1 580 kHz (621 kHz) 1,490 kHz (1,395 kHz) FM VCO VOLTAGE CONFIRMATION Frequency Display Reading on Digital Voltmeter 3 ± 0.3V Less than 11 ± 1V [FM] Setting: Band switch: FM FM RF signal generator 0.01 µF set 22.5 kHz frequency deviation by 400 Hz signal Output level: