Sangean MMR-77 User Manual

MMR-77 FM/AM 2 BAND RECEIVER CONTENTS Specification ………………………………………………………………………………………………………2-3Block Diagram ………………………………………………………………………

TEST POINTS DIAGRAM10

MAIN PCB TOP VIEW11

MAIN PCB BOTTOM VIEW12

CONTROL PCB TOP VIEW13

CONTROL PCB BOTTOM VIEW14

WIRING DIAGRAM15

( 1 ) Weak sensitivity on FM mode Check whether the sensitivity is recovered if antenna is directly Yes Check the a

( 3 ) Buzzer can not be turned on Yes Check Q3 and L4. Check whether the R8 and R10 is 3V DC.

R9994PART NO DESCRIPTION Q'TY REMARK1012860 IC CXA 1619BS 1 IC 1,1012892-A CH IC XC62FP2002PRN PbF 1 IC 3,1014100-A CH IC BA10324AFV PbF 1 IC 2,1

R9994PART NO DESCRIPTION Q'TY REMARK5447331-A CH CC 473K 25V B-C 3 C 15-17,5447365-A CH CC 473Z 50V Y5V-C 13 C 2,21,23,32,34,35-39,49,104,105,6

SPECIFICATION. FM. ELECTRICAL PERFORMANCE Model: MMR-77 Brand:SANGEANTemp: °CR.H.: % Date:2005/06/15 Condition Value Test no. Test Item Input

MMR-77Ref no PART NO.DESCRIPTIONQ'TYDWG NO. REMARK1 20N6000 BATTERY CASE HOLDER 1 A4-N6-29A2 20N6010 SPEAKER HOLDER 1 A2-N6-30A3 20N6030 BAR ANT

MMR-77Ref no PART NO.DESCRIPTIONQ'TYDWG NO. REMARK58 360N64M ROD ANTENNA 159 361N64M POINTER 1 A3-N6-25A60 370N64M1 CRANK HANDLE COVER 1 A4-N6-11

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

3. IC3 – XC62AP2002PR 4. IC4 & IC101– TC7WH74FK 24

IC1 – CXA1619BS IC2 – BA10324AF PIN FM AM PIN FM AM PIN C OFF C ON 1 0 0 16 1.38 0 1 0 0.0

Transistor R ON B ON C OFF C ON L OFF L ON E 1.27 1.27

A1 3CAB EC2CAIN5817CACRLS41482SC1623(A:Anode C:Cathode)RB110CT100RB160M(E:Emitter C:Collector B:Base)2SB8152SA812DiodesTransistorsSEMICONDUCTOR LEAD I

SCHEMATIC DIAGRAM28

SPECIFICATION. MW. ELECTRICAL PERFORMANCE Model: MMR-77 Brand:SANGEANTemp: °CR.H.: % Date: 2005/05/15 Condition Value Test no. Test Item Input

BLOCK DIAGRAM4

1. ALIGNMENT FOR AM IF a. Required Instrument AM IF Sweep Generator with Scope b. Alignment Procedure Mode Adjustment Procedure (1) Set the po

2. ALIGNMENT FOR FM FREQUENCY RANGE a. Required Instruments FM RF signal generator SSVM b. Alignment Procedure Mode Adjustment Procedure (1) S

3. ALIGNMENT FOR FM SENSITIVITY a. Required Instrument FM RF signal generator SSVM b. Alignment Procedure Mode Adjustment Procedure (1) Set th

4. ALIGNMENT FOR MW FREQUENCY a. Required Instrument RF signal generator SSVM b. Alignment Procedure Mode Adjustment Procedure (1) Set the pow

5. ALIGNMENT FOR MW SENSITIVITY a. Required Instrument RF signal generator SSVM b. Alignment Procedure Mode Adjustment Procedure (1) Set the p