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SRF-M75PM SERVICE MANUAL Ver 1.0 1999. 04 US Model Canadian Model AEP Model E Model Australian Model SPECIFICATIONS US, Canadian, and E models AEP, Australian models FM STEREO/AM PLL SYNTHESIZED RADIO MICROFILM SECTION 1 SERVICING NOTES TABLE OF CONTENTS 1. 2. 3. 4. SERVICING NOTES ... 2 GENERAL ... 3 DISASSEMBLY ... 4 ELECTRICAL ADJUSTMENTS TUNER Section ... 6 PULSE MONITOR Section ... 8 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". Notes on chip component replacement · Never reuse a disconnected chip component. · Notice that the minus side of a tantalum capacitor may be damaged by heat. 5. 5-1. 5-2. 5-3. 5-4. DIAGRAMS Block Diagram ... Printed Wiring Boards ... Schematic Diagram ... IC Pin Function Description ... 9 12 15 20 6. 7. EXPLODED VIEW ... 21 ELECTRICAL PARTS LIST ... 22 ­2­ SECTION 2 GENERAL This section is extracted from instruction manual. US, Canadian, and E models AEP, Australian models ­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 TUNER SECTION [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 + ­ L1 CT1 0 dB=1 µV T1 AM IF ADJUSTMENT Adjust for a maximum reading on level meter 450 kHz AM VCO VOLTAGE ADJUSTMENT Adjustment Part Frequency Display 530 kHz (531 kHz) 1710