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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

Summary of Contents for MMR-77

Page 1: ...N 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 Exp...

Page 2: ...S N 6dB 90MHz 50 dB 3db Limiting 10mv 80dBu 18 24 dBu Min output 60dBu 1 5 3 mV Tuning Ind Sens 26 32 Auto Scan Stop Sens Stereo indicator Sens dBu Buzzer freq 2 5 0 2 KHz Buzzer Lever 2 5 2 0 VP P S...

Page 3: ...z S N 6dB 26 20 dB Bandwidth 6dB Mod400Hz S N 6dB 4 9 KHz T H D 74dBu m 3 5 Lowest Batt Volt 74dBu m 1 8 2 0 V Hum Modulation 100dBu m dB Tuning Ind Sens 56 62 dBu m Auto Scan Stop Sens dBu m S N Rati...

Page 4: ...BLOCK DIAGRAM 4...

Page 5: ...ep generator in series with a 10uF capacitor to the IC1 pin24 3 Connect the RF output terminal of the AM IF sweep generator in series with a capacitor 0 01uF capacitor to the IC1 pin11 4 Adjust T1 to...

Page 6: ...signal generator to the standard FM band with frequency deviation to 22 5KHz 1KHz modulation 5 With the tuning gang fully closed set signal generator to 87 5MHz 0 5MHz and adjust L3 stretch or squeez...

Page 7: ...of TP1 4 Set frequency of the signal generator to the standard FM band with frequency deviation to 22 5KHz 1KHz modulation 5 Set signal generator to 90MHz and adjust L2 stretch or squeeze for maximum...

Page 8: ...ect the AM signal generator to the loop antenna 4 Set signal generator to 511KHz with 30 modulation set tuning gang fully closed and adjust T2 for T2 for maximum reading on SSVM 5 Set signal generator...

Page 9: ...signal generator to the loop antenna 4 Set signal generator to 600KHz with 30 modulation set tuning to signal and adjust L1 for maximum reading on SSVM 5 Set signal generator to 1400KHz set tuning to...

Page 10: ...TEST POINTS DIAGRAM 10...

Page 11: ...MAIN PCB TOP VIEW 11...

Page 12: ...MAIN PCB BOTTOM VIEW 12...

Page 13: ...CONTROL PCB TOP VIEW 13...

Page 14: ...CONTROL PCB BOTTOM VIEW 14...

Page 15: ...WIRING DIAGRAM 15...

Page 16: ...al and connected to the point between antenna circuit C1 No Yes Check IF waveform Check CF1 t1 No Check C6 and L2 2 Weak sensitivity in AM band Check the antenna circuit and antenna terminal No No Che...

Page 17: ...d on Yes Check Q3 and L4 Check whether the R8 and R10 is 3V DC No Yes Check IC4 Q7 and Q8 Check Q2 and C14 4 Light can not be turned ON Yes Check whether Q103 and Q104 Check whether the PIN5 of IC101...

Page 18: ...1 SW 3 1631050 TACT SW 1P1C 1 SW 2 1631632 TACK SW 130 30gf 5mm 1 SW 102 1631680 A SLIDE SW 1P3C PbF 1 SW 1 1640180 JACK HP TC38 061 01 BLK 1 JK 301 1647150 A DC JACK 595J1 02KBA PbF 1 JK 302 1660281...

Page 19: ...8 34 6130149 CH RD 1 16W 12KJ C PbF 1 R 2 6130154 CH RD 1 16W 33KJ C PbF 1 R 16 6130156 CH RD 1 16W 47KJ C PbF 4 R 6 24 35 108 6130158 CH RD 1 16W 68KJ C PbF 2 R 29 30 6130161 CH RD 1 16W 120KJ C 1 R...

Page 20: ...A4 N6 55A BACK COVER 27 23N6000 BATTERY COVER SPONGE 1 A4 N6 44A 28 23N6010 PC PLATE 1 A4 N6 57A 29 24N60001 O RING 6 4 A4 N6 02A 30 24N6020 DC JACK SPONGE 1 A4 N6 04A 31 24N6030 SPEAKER PACKING 1 A4...

Page 21: ...9102052 SCREW PTP 2 6x5 NI 5 SPEAKERx2 C PCBx1 D PCBx2 65 9102082 SCREW PTP 2 6x8 NI 6 CHASSISx4 B PCBx1 BACK COVERx1 66 9152082 SCREW PTPW 2 6x8 NI 1 CRANK 67 9153082 SCREW PTPW 3x8 NI 2 MOTOR 68 919...

Page 22: ......

Page 23: ...IC CIRCUIT BLOCK DIAGRAM 1 IC1 CXA1619BS 2 IC2 BA10324AF 23...

Page 24: ...3 IC3 XC62AP2002PR 4 IC4 IC101 TC7WH74FK 24...

Page 25: ...23 1 37 1 09 8 0 0 9 1 26 1 27 24 1 42 1 01 9 0 0 41 10 1 26 1 27 25 0 0 10 0 0 34 11 1 26 1 27 26 2 69 2 70 11 0 0 50 12 0 0 27 3 00 3 00 12 0 0 13 0 35 0 28 1 55 1 52 13 0 0 41 14 0 0 29 0 0 14 0 0...

Page 26: ...60 E 3 01 0 B 0 35 1 35 Q9 B 0 2 90 B 0 0 59 Q2 C 0 0 85 C 0 3 63 Q102 C 0 0 E 0 32 2 95 E 0 0 B 0 2 0 55 Q10 B 0 0 60 Q3 C 0 0 C 0 0 E 3 00 0 05 B 0 30 0 60 Q5 C 0 0 E 3 00 3 00 B 3 00 2 31 Q6 C 3 00...

Page 27: ...A 1 3 C A B E C 2 C A IN5817 C A C RLS4148 2SC1623 A Anode C Cathode RB110CT100 RB160M E Emitter C Collector B Base 2SB815 2SA812 Diodes Transistors SEMICONDUCTOR LEAD IDENTIFICATIONS 27...

Page 28: ...SCHEMATIC DIAGRAM 28...

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