Table of Contents
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MMR-77
FM/AM 2 BAND RECEIVER
CONTENTS
Specification .....................................................................................................................2-3
Block Diagram .....................................................................................................................4
Algnment Instructions............................................................................................................5-9
Test Points Diagram.................................................................................................................10
MAIN PCB Top View..............................................................................................................11
MAIN PCB Bottom View...........................................................................................................12
CONTROL PCB Top View...........................................................................................................13
CONTROL PCB Top View...........................................................................................................14
Wiring Diagram............................................................................................................15
Troubleshooting Flow Chart.....................................................................................................16-17
Electrical Parts List...............................................................................................................18-19
Mechanical Parts List...........................................................................................................20-21
Exploded Views........................................................................................................................22
IC Circuit Block Diagram......................................................................................................23-24
Voltage Chart.............................................................................................................25-26
Semiconductor Lead Identifications...........................................................................................27
Schematic Diagram.............................................................................................................28
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Summary of Contents for Sangean MMR-77
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Page 1: Table Of Contents
MMR-77 FM/AM 2 BAND RECEIVER CONTENTS Specification ………………………………………………………………………………………………………2-3 Block Diagram ………………………………………………………………………………………………………4 Algnment Instructions………………………………………………………………………………………………5-9 Test Points Diagram…………………………………………………………………………….……….……………10 MAIN PCB Top View.………………………………………………………………………….……..………..…..11 MAIN PCB Bottom View…………………………………………………………………………….………….……12 CONTROL PCB Top View.……………………………………………………………………….……..………..…..13 CONTROL PCB Top View.……………………………………………………………………….……..………..…..14 Wiring Diagram..….………………………………………….………………….….……………..……….15 Troubleshooting Flow Chart..….………………………………………….……………….….……………..……16-17 Electrical Parts List………………………………………………..………………………………..……………18-19 Mechanical Parts List……………………………………………………………………………….…………….20-21... -
Page 2: Specification
SPECIFICA TION. FM. ELECTRICAL PERFORMANCE °C R.H.: Brand:SANGEAN Temp: Model: MMR-77 % Date:2005/06/15 Condition Value Test no. Test Item Unit Input Output freq Nom. 87.5 ±0.5 Tuning Range S/N=6dB 108.5 ±0.5 ±0.15 Intermediate freq. S/N=6dB 10.7 90MHz Max. Sensitivity S/N=6dB... - Page 3 SPECIFICA TION. MW. ELECTRICAL PERFORMANCE °C R.H.: Brand:SANGEAN Temp: Model: MMR-77 % Date: 2005/05/15 Condition Value Test no. Test Item Unit Input Output freq Nom. Tuning Range 1750 1710 ±3.5 Intermediate freq. S/N=6dB 600KHz Max. Sensitivity S/N=6dB 1000KHz dBu/m 1400KHz...
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Page 4: Block Diagram
BLOCK DIAGRAM... -
Page 5: Algnment Instructions
ALIGNMENT INSTRUCTIONS 1. ALIGNMENT FOR AM IF Required Instrument AM IF Sweep Generator with Scope Alignment Procedure Mode Adjustment Procedure Set the power switch to ON position. Connect the input terminal of the AM IF sweep generator in series with a 10uF capacitor to the IC1 pin24. - Page 6 2. ALIGNMENT FOR FM FREQUENCY RANGE Required Instruments FM RF signal generator SSVM Alignment Procedure Mode Adjustment Procedure Set the power switch to ON position. Connect a SSVM to the AF out (TP3 and TP4). Connect the FM signal generator to the input terminal of TP1. Set frequency of the signal generator to the standard FM band, with frequency deviation to 22.5KHz, 1KHz modulation.
- Page 7 3. ALIGNMENT FOR FM SENSITIVITY Required Instrument FM RF signal generator SSVM Alignment Procedure Mode Adjustment Procedure Set the power switch to ON position. Connect a SSVM to the AF out (TP3 and TP4). Connect the FM signal generator to the input terminal of TP1. Set frequency of the signal generator to the standard FM band, with frequency deviation to 22.5KHz, 1KHz modulation.
- Page 8 4. ALIGNMENT FOR MW FREQUENCY Required Instrument RF signal generator SSVM Alignment Procedure Mode Adjustment Procedure Set the power switch to ON position. Connect a SSVM to the AF out (TP3 and TP4). Connect the AM signal generator to the loop antenna Set signal generator to 511KHz, with 30% modulation set tuning gang fully closed, and adjust T2 for T2 for maximum reading on SSVM.
- Page 9 5. ALIGNMENT FOR MW SENSITIVITY Required Instrument RF signal generator SSVM Alignment Procedure Mode Adjustment Procedure Set the power switch to ON position. Connect a SSVM to the AF out (TP3 and TP4). Connect the AM signal generator to the loop antenna Set signal generator to 600KHz, with 30% modulation set tuning to signal, and adjust L1 for maximum reading on SSVM.
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Page 10: Test Points Diagram
TEST POINTS DIAGRAM... -
Page 11: Main Pcb Top View
MAIN PCB TOP VIEW... -
Page 12: Main Pcb Bottom View
MAIN PCB BOTTOM VIEW... -
Page 13: Control Pcb Top View
CONTROL PCB TOP VIEW... -
Page 14: Control Pcb Top View
CONTROL PCB BOTTOM VIEW... -
Page 15: Wiring Diagram
WIRING DIAGRAM... -
Page 16: Troubleshooting Flow Chart
TROUBLESHOOTING FLOW CHART ( 1 ) Weak sensitivity on FM mode Check whether the sensitivity is recovered if antenna is directly Check the antenna terminal and connected to the point between antenna circuit. Check IF waveform. Check CF1, t1. Check C6 and L2. ( 2 ) Weak sensitivity in AM band Check the antenna circuit and antenna terminal. - Page 17 ( 3 ) Buzzer can not be turned on Check whether the R8 and R10 is Check Q3 and L4. 3V DC. Check IC4, Q7 and Q8. Check Q2 and C14. ( 4 ) Light can not be turned ON Check whether the PIN5 of IC101 is Check whether Q103 and Q104.
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Page 18: Electrical Parts List
SP COIL 4.5x2.5Tx0.7I L 3, 1200301 PVC MQ-22125-RN343-0 1316425-A R-VR 50KB F-12SH2 VR 1, 1613171 PCB A RF-G77 1613180 PCB C MMR-77 1613190 PCB D MMR-77 1621020-A SPK 50mm 8Ω 0.4W 1630280-A SLIDE SW.1P2C(G) PbF SW 3, 1631050 TACT SW 1P1C... - Page 19 ELECTRICAL PARTS LIST R9994 PART NO DESCRIPTION Q'TY REMARK 5447331-A CH CC 473K 25V B-C C 15-17, 5447365-A CH CC 473Z 50V Y5V-C C 2,21,23,32,34,35-39, 49,104,105, 6130114 CH RD 1/16W 15J-C PbF R 111, 6130116 CH RD 1/16W 22J-C PbF R 112,301, 6130124 CH RD 1/16W 100J-C PbF...
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Page 20: Mechanical Parts List
MECHANICAL PARTS LIST MMR-77 Ref no PART NO. Q'TY DWG NO. DESCRIPTION REMARK 20N6000 BATTERY CASE HOLDER A4-N6-29A 20N6010 SPEAKER HOLDER A2-N6-30A 20N6030 BAR ANT HOLDER A4-N6-32A 20N6060 TUNING SHAFT GEAR A4-N6-35A 20N6080 CHASSIS A2-N6-37A 20N6090 BUZZER KNOB HOLDER A4-N6-38A... - Page 21 MECHANICAL PARTS LIST MMR-77 Ref no PART NO. Q'TY DWG NO. DESCRIPTION REMARK 360N64M ROD ANTENNA 361N64M POINTER A3-N6-25A 370N64M1 CRANK HANDLE COVER A4-N6-11A 9000042 SCREW JMP 1.7x4(NI) 9003082 SCREW JMP 3x8(NI) ROD ANTENNA 9090014 SCREW M1.4x4.5(NI) JACK COVER RUBBERx2...
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Page 23: Ic Circuit Block Diagram
IC CIRCUIT BLOCK DIAGRAM 1. IC1 – CXA1619BS 2. IC2 – BA10324AF... - Page 24 3. IC3 – XC62AP2002PR 4. IC4 & IC101– TC7WH74FK...
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Page 25: Voltage Chart
IC AND TRANSISTOR VOLTAGE CHART IC1 – CXA1619BS IC2 – BA10324AF PIN C OFF C ON 1.38 0.03 0.02 0.41 2.25 2.73 1.41 0.50 1.50 3.80 0.22 0.22 2.95 3.00 0.50 1.26 1.27 0.41 1.26 1.27 1.12 1.50 2.65 1.26 1.27 1.37 1.09... - Page 26 Transistor R ON B ON C OFF C ON L OFF L ON 1.27 1.27 2.95 Q101 0.06 1.84 0.68 3.05 2.34 0.21 1.25 3.05 3.05 0.35 2.98 3.60 3.01 Q102 0.35 1.35 2.90 0.59 0.85 3.63 0.32 2.95 0.55 Q10 B 0.60 3.00...
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Page 27: Semiconductor Lead Identifications
SEMICONDUCTOR LEAD IDENTIFICATIONS Transistors 2SC1623 2SA812 2SB815 (E:Emitter C:Collector B:Base) Diodes RLS4148 IN5817 RB160M RB110CT100 (A:Anode C:Cathode) -
Page 28: Schematic Diagram
SCHEMATIC DIAGRAM...
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