Sangean MMR-77 User manual

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

SPECIFICATION.
FM. ELECTRICAL PERFORMANCE
Model: MMR-77 Brand:SANGEAN Temp: °C R.H.: % Date:2005/06/15
Condition Value Test no.
Test Item Input Output freq Nom. Lim 1. 2. 3. Unit
Min 87.5 ±0.5
Tuning Range S/N=6dB Max 108.5 ±0.5 MHz
Intermediate freq. S/N=6dB 10.7 ±0.15 MHz
Max. Sensitivity S/N=6dB 90MHz
98MHz
106MHz
12
12
12
18
18
18 dBu
Usable Sensitivity S/N=30dB 90MHz 98MHz
106MHz
20
20
20
26
26
26 dBu
Image Rejection S/N=6dB 106MHz 26 20 dB
I.F. Rejection 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/N 46 40 dB
Current Consumption
RO 10mw 30 36 mA
Am. Suppression (1mV) 26 dB
4500 4000 Hz
Audio fidelity
-6dB 100 150 Hz
Max. 120 100
Output Power(75Khzdev) 10%T.H.D. 120 100 mW
T. H. D. (75KHz dev.)
60dBu
1.5 3 %
Over load capacity 10%T. H.D.
98MHz
100 90 dBu
Calibration S/N=6dBu 90MHz 98MHz
106MHz ±1000 ±1500 KHz
Lowest Batt. Volt. 60dBu 1.8 2.0 V
Supply Voltage: DC 3 V R.O.: 50mW Load: 8 Ohm Modulation: 1KHz Mod./22.5KHz Dev.
Remark:
( )首件產品 ( )客戶抽測:
( )成品 ( )例行抽測 ( )業務樣品:
( )半成品( V )新機種 ( )工程變更:
Approved by Released/Tested by
2

SPECIFICATION.
MW. ELECTRICAL PERFORMANCE
Model: MMR-77 Brand:SANGEAN Temp: °C R.H.: % Date: 2005/05/15
Condition Value Test no.
Test Item Input Output freq Nom. Lim 1. 2. 3. Unit
Min 515 525
Tuning Range Max 1750 1710 KHz
Intermediate freq. S/N=6dB Min 460 ±3.5 KHz
Max. Sensitivity S/N=6dB 600KHz
1000KHz
1400KHz 56
56
56
dBu/m
Usable Sensitivity S/N=20dB 600KHz 1000KHz
1400KHz
58
56
56
64
64
64
dBu/m
Image Rejection S/N=6dB 1400KHz 26 20 dB
I.F. Rejection S/N=6dB 600KHz 40 40 dB
Selectivity(±10KHz) 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 Ration 74dBu/m 30 dB
Current Consumption 74dBu/m 10mW 34 28 mA
1m/120T out 10mW 74dBu/m 30 ±3 m
100 150 Hz
Freq. Response
(-6dB) 74dBu/m 2200 2000 Hz
MAX 120 100
Output Power(80%dev) 74dBu/m 10%T.H.D. 120 100 mW
Over load capacity 80%mod. 10%T. H.D. 100 90 dBu/m
A. G. C. F. O. M. 100dBu/m
1000KHz
46 40 dB
Calibration S/N=6dBu 600KHz 1000KHz
1400KHz±50 ±70 KHz
Whistle Modulation 74dBu/m 2IF/3IF 10 %
Supply Voltage: DC 3V R.O.: 50mW Load: 8 Ohm Modulation: 1000Hz/30%
Remark:
( )首件產品 ( )客戶抽測:
( )成品 ( )例行抽測 ( )業務樣品:
( )半成品( V )新機種 ( )工程變更:
Approved by Released/Tested by
3

BLOCK DIAGRAM
4

1. ALIGNMENT FOR AM IF
a. Required Instrument
AM IF Sweep Generator with Scope
b. Alignment Procedure
Mode Adjustment Procedure
(1) Set the power switch to ON position.
(2) Connect the input terminal of the AM IF sweep 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 have a maximum output with a marker frequency of 455KHz on the
AM T1
sweep scope.
c. Instrument Connection
T1
IC1 pin11
OUT IN
455KHz Marker IC1 pin24
AM IF Sweep Generator
10uF0.01uF
ALIGNMENT INSTRUCTIONS
5

2. ALIGNMENT FOR FM FREQUENCY RANGE
a. Required Instruments
FM RF signal generator
SSVM
b. Alignment Procedure
Mode Adjustment Procedure
(1) Set the power switch to ON position.
(2) Connect a SSVM to the AF out (TP3 and TP4).
(3) Connect the FM signal generator to the input terminal of TP1.
(4) Set frequency of the 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 squeeze) for maximum reading on SSVM.
(6) With the tuning gang fully open, set signal generator to 108MHz±0.5MHz,
adjust TC3 for maximum reading on the SSVM.
FM L3
TC3
(7) Repeat steps (5) and (6) until best sensitivity is obtained at both frequencies.
c. Instrument Connection
TC3
L3
TP1
Signal Generator
TP3
TP4
SSVM
6

3. ALIGNMENT FOR FM SENSITIVITY
a. Required Instrument
FM RF signal generator
SSVM
b. Alignment Procedure
Mode Adjustment Procedure
(1) Set the power switch to ON position.
(2) Connect a SSVM to the AF out (TP3 and TP4).
(3) Connect the FM signal generator to the input terminal 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 reading on SSVM.
(6) Set signal generator to 106MHz and adjust TC2 (stretch or squeeze) for
maximum reading on SSVM.
FM L2
TC2
(7) Repeat steps (5) and (6) until best sensitivity is obtained at both frequencies.
c. Instrument Connection
L2
TC2
TP1
Signal Generator
TP3
TP4
SSVM
7

4. ALIGNMENT FOR MW FREQUENCY
a. Required Instrument
RF signal generator
SSVM
b. Alignment Procedure
Mode Adjustment Procedure
(1) Set the power switch to ON position.
(2) Connect a SSVM to the AF out (TP3 and TP4).
(3) Connect 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 to 1735KHz set tuning gang fully open, and adjust TC4
maximum reading on SSVM.
MW T2
TC4
(6) Repeat steps (4) and (5) until best sensitivity is obtained at both frequencies.
c. Instrument Connection
T2
TC4
TP3
TP4
SSVM
8

5. ALIGNMENT FOR MW SENSITIVITY
a. Required Instrument
RF signal generator
SSVM
b. Alignment Procedure
Mode Adjustment Procedure
(1) Set the power switch to ON position.
(2) Connect a SSVM to the AF out (TP3 and TP4).
(3) Connect the AM 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 signal, and adjust TC1 for
maximum reading on SSVM.
MW L1
TC1
(6) Repeat steps (4) and (5) until best sensitivity is obtained at both frequencies.
c. Instrument Connection
TC1
L1
50Ω
(60 cm)
L1 Antenna Bar
Signal Generator
TP3
TP4
SSVM
9

TEST POINTS DIAGRAM
10

MAIN PCB TOP VIEW
11

MAIN PCB BOTTOM VIEW
12

CONTROL PCB TOP VIEW
13

CONTROL PCB BOTTOM VIEW
14

WIRING DIAGRAM
15

( 1 ) Weak sensitivity on FM mode
Check whether the sensitivity is
recovered if antenna is directly Yes Check the antenna terminal 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
Check whether If is normal. Check T1 and IC1.
Yes
Check whether the antenna circuit
is normal. (L1, C4)
TROUBLESHOOTING FLOW CHART
16

( 3 ) Buzzer can not be turned 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 is
3V DC.
No
Check IC101.
17

R9994
PART NO DESCRIPTION Q'TY REMAR
K
1012860 IC CXA 1619BS 1 IC 1,
1012892-A CH IC XC62FP2002PRN PbF 1 IC 3,
1014100-A CH IC BA10324AFV PbF 1 IC 2,
1014110 CH IC TC 7W74FK 2 IC 4,101,
1020211 CH TR 2SB815 B7 2 Q 6,103,
1020230-A CH TR 2SA812-T1B-A M6PbF 2 Q 8,9,
1020240-A CH TR 2SC1623T1B-AL6 8 Q 1-5,7,10,104,
1041190T DIODE 1N5817-T 1 D 301,
1041280-A CH SCHOTTKY RB160M-40PbF 7 D 3-9,
1046011 CH DIODE MM4148 2 D 1,2,
1050350 LED RED 3φ20E4SRTS 1 LED2,
1053090 LED GRN 3φRT3-5034 YGS 1 LED1,
1053210-A LED GRN 3φHL304GC2E-010 2 LED103,104,
1111301 BAR COIL 1301 1 L 1,
1122371 ADJ. COIL 2371 1 T 1,
1123800 ADJCOIL 3800 613ANA034AH 1 T 2,
11311D1J CH WOUND IND. 0.68uHJ-E 1 L 5,
1136704-A FIXED COIL 33mH PbF 1 L 4,
1143150 SP.COIL 4.0x3.75Tx0.6I 1 L 2,
1144070 SP COIL 4.5x2.5Tx0.7I 1 L 3,
1200301 PVC MQ-22125-RN343-0 1 PVC
1316425-A R-VR 50KB F-12SH2 1 VR 1,
1613171 PCB A RF-G77 1
1613180 PCB C MMR-77 1
1613190 PCB D MMR-77 1
1621020-A SPK 50mm 8Ω0.4W 1
1630280-A SLIDE SW.1P2C(G) PbF 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-A DISCRI CDALF10M7GA016-B0 1 CF 3,
1664021-A FILTER PFWLF455KS2A-A0 1 CF 2,
1664120-A FILTER SFELF10M7GAA0-B0 1 CF 1,
1680070 LAMP 3x10x6.35 3V/250mA 1 LAMP 401
1701012 A2001WR2-2P 1 CON201,
1850304 H.S.TUBE 1.5φx20mm 1
1900760 MOTOR KDF-29 1
1900770-A BATT.RECHARGE AAAx2 1 GP
2149120 ANT TERMINAL PIN 1 BT+,
444754NT0 EL 475M 25V 4x7 1 C 25,
441063NT0 EL 106M 16V 4x7 3 C 9,24,26,
444760NT0 EL 476M 4V 4x7 1 C 14,
441072PT0 EL 107M 10V 5x11 1 C 302,
4900304S EL 477M 6.3V 6.3x11-S 1 C 30,
4900304T0 EL 477M 6.3V 6.3x11 1 C 33,
4B10612 CH TA 106M 6.3V 3.2x1.6 3 C 3,29,53,
5410267-A CH CC 102K 50V X7R-C 5 C 1,12,50,51,52,
5410361-A CH CC 103K 50V X7R-C 8 C 19,20,43-48,
5410458-A CH CC 104Z 16V Y5V-C 6 C 5,11,13,28,40,301,
5410557-A CH CC 105Z 10V F-C 4 C 31,41,42,106,
5422001-A CH CC 220J 50V NPO-C 1 C 6,
5422261-A CH CC 222K 50V X7R-C 1 C 18,
5422367-A CH CC 223K 25V X7R-C 1 C 27,
5427101-A CH CC 271J 50V NPO-C 1 C 22,
5430001-A CH CC 300J 50V NPO-C 1 C 7,
ELECTRICAL PARTS LIST
18

R9994
PART NO DESCRIPTION Q'TY REMAR
K
5447331-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,
6130114 CH RD 1/16W 15J-C PbF 1 R 111,
6130116 CH RD 1/16W 22J-C PbF 2 R 112,301,
6130124 CH RD 1/16W 100J-C PbF 6 R 3,4,14,31,33,110,
6130125 CH RD 1/16W 120J-C PbF 1 R 21,
6130126 CH RD 1/16W 150J-C PbF 1 R 5,
6130130 CH RD 1/16W 330J-C PbF 1 R 18,
6130133 CH RD 1/16W 560J-C PbF 1 R 10,
6130136 CH RD 1/16W 1KJ-C PbF 2 R 1,13,
6130137 CH RD 1/16W 1.2KJ-C PbF 1 R 25,
6130138 CH RD 1/16W 1.5KJ-C PbF 2 R 7,27,
6130140 CH RD 1/16W 2.2KJ-C PbF 5 R 11,12,19,26,102,
6130144 CH RD 1/16W 4.7KJ-C PbF 1 R 37,
6130145 CH RD 1/16W 5K6J-C PbF 1 R 17,
6130148 CH RD 1/16W 10KJ-C PbF 5 R 15,20,22,28,34,
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 8,
6130163 CH RD 1/16W 180KJ-C 1 R 9,
6130168 CH RD 1/16W 470KJ-C 2 R 32,109,
6130172 CH RD 1/16W 1MJ-C PbF 2 R 23,107,
6130194 CH RD 1/16W OJ-C PbF 13 JP 12-16,20-23,26,32,
101,102,
6150194 CH JUMP OJ-B PbF 6 JP 17-19,24,25,301,
6480604 RDF 2W 2.2J SM15(MG) 1 R 36,
8000010 W/JUMP 5(10)0.6mm 13 JP 1-5,8-11,30,31,201,
202,
8000040 W/JUMP 10(10)0.6mm 3 JP 6,7,29,
8050200-A W/TERMINAL 50(2.5)W 1 ANT1,
8170340 W/PVC 35(6+6)BLK 2 BT_,CHBT_1
8170847 W/PVC 60(6+6)VIL 1 B
8171443 W/PVC 90(6+6)ORN 1 A
8172442 W/PVC 140(6+6)RED 1 BT+
8591710 W/PVC/2 100(6+6) RED/WHT 1 JW 104,
8592790-A W/PVC/3 60(3+6)R/W/B 1 JW 103,
8592820-A W/2 140(6+6) R/W 1 SP+-
8592840-A W/2 100(5+3) 1 CH BT
8592900-A W/PVC/2 60(6+6)R/B 1 JW 101,
ELECTRICAL PARTS LIST
19

M
MR-77
Ref no PART NO. DESCRIPTION Q'TY DWG NO. REMARK
1 20N6000 BATTERY CASE HOLDER 1 A4-N6-29A
2 20N6010 SPEAKER HOLDER 1 A2-N6-30A
3 20N6030 BAR ANT HOLDER 2 A4-N6-32A
4 20N6060 TUNING SHAFT GEAR 1 A4-N6-35A
5 20N6080 CHASSIS 1 A2-N6-37A
6 20N6090 BUZZER KNOB HOLDER 1 A4-N6-38A
7 20N6100 BAND KNOB SHAFT 1 A4-N6-39A
8 20N6110 BATT.SELECT KNOB HOLDER 1 A3-N6-40A
9 20N61201 TUNING SHAFT 1 A4-N6-41A
10 20N6130 VOLUME KNOB SHAFT 1 A4-N6-42A
11 20N61401 CRANK BASE HOLDER 1 A4-N6-64A
12 20N6150 PIN HOLDER 1 A4-N6-65A
13 20N6160 BACK LIGHT HOLDER 1 A2-N6-31B
14 20N6170 GEAR DRUM 1 A3-N6-33B
15 20N6180 TERMINAL GEAR 1 A3-N6-34B
16 20N6190 POINTER GEAR 1 A3-N6-36B
17 2111005A SPR CLICK 1 A4-N6-29A
18 21B1110A ROTARY KNOB RING 2 A4-WR1-52A
19 21N6000 PIN 1 A4-N6-05A CRANK HANDLE
20 21N6010 BATTERY SPRING 1 A4-N6-45A
21 21N6020 BATTERY CONTACT(+) 1 A4-N6-06A
22 21N6040 CRANK PLATE 1 A4-N6-58A
23 21N6050 CRANK BASE SPRING 2 A4-N6-60A
24 22L4020 HEMELON 2 A4-523-40
25 22N6000 NET 1 A4-N6-54A
26 22N6010 RIBBON 1 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 φ6 4 A4-N6-02A
30 24N6020 DC JACK SPONGE 1 A4-N6-04A
31 24N6030 SPEAKER PACKING 1 A4-N6-09A
32 24N6040 BATTERY CASE RUBBER-A 2 A4-N6-46A
33 24N6050 BATTERY CASE RUBBER-B 1 A4-N6-47A
34 24N6060 FRONT CABINET PACKING 1 A4-N6-48A
35 24N6070 NIMH BATTERY SPONGE 1 A4-N6-49A
36 24N6080 RUBBER SPACER 2 A4-N6-51A
37 24N6090 PHONE JACK SPONGE 1 A4-N6-56A
38 301N601 FRONT CABINET 1 A1-N6-12A
39 303N601 BACK COVER 1 A1-N6-13A
40 304N601 BATTERY COVER 1 A3-N6-14A
41 305N601 DIAL WINDOW 1 A4-N6-22A
42 306N601 DIAL SCALE LENS 1 A3-N6-23A
43 308N64M CRANK BASE 1 A3-N6-15A
44 309N64M CRANK HANDLE 1 A3-N6-16A
45 310N601 CRANK 1 A3-N6-17A
46 311N601 VOLUME KNOB 1 A3-N6-19A
47 312N6011 TUNING KNOB 1 A3-N6-18A
48 313N64M BAND KNOB 1 A3-N6-20A
49 314N64M BATTERY SELECT KNOB 1 A3-N6-21A
50 316N601 JACK COVER RUBBER 1 A3-N6-27A
51 316N64M1 FOOT RUBBER 4 A4-N6-28A
52 316N64M3 HAND RUBBER 1 A3-N6-26A
53 318N601 LIGHT KNOB 1 A3-N6-08A
54 325N64M BUZZER KNOB 1 A3-N6-07A
55 330N601 ROD ANT HOLDER 1 A4-N6-50A
56 331N64M BAND KNOB HOLDER 1 A3-N6-24A
57 346N601 LAMP HOLDER 1 A3-N6-60A
MECHANICAL PARTS LIST
20