Sangean U-2 service Manual
Contents
1. Model U2 ATR 1 Brand COMMON Temp 25 R H 75 Date 2003 9 9 Condition Value Test No Test Item Unit Input Output Freq Nom Lim 1 2 Tuning Range Min 515 17 kHz Max 1730 20 Intermediate freq 455 3 kHz 600 kHz 48 52 Sensitivity S N 6dB 1000 kHz 46 50 dB 1400kHz 46 50 600 kHz 52 58 Usable Sensitivity S N 20dB 1000 kHz S0 56 dB 1400kHz 50 56 Image Rejection S N 6dB 1000kHz 36 30 dB I F Rejection 450KHz S N 6dB 60 50 dB Selectivity 10KHz S N 6dB 32 26 dB Bandwidth 6dB 3 KHz T H D 5mV R O 4 Lowest Batt Volt LED OFF R O 4 2 V Tuning Ind Sens S6 dB S N Ratio RF 5mV 32 dB Current Consumption 7448 m R O 1000 1 140 170 mA Audio fidelity lt 100 Hz 74dB m 6dB gt 2 5 KHz Output power Mod 80 74dB m 10 THD 2 1 8 w Over Load Capacity 80 Mod 10 THD 100 gt 90 dB m A G C F O M 100 dB m gt 50 dB 600 50 Calibration 1000 80 KHz 1400 60 Whistle Modulation Sm V M lt 15 Supply Voltage DC 6 50 mW Load 4 Ohm Modulation Dev 30 1kHz Remark Approved by Released Tested by BLOCK DIAGRAM ALIGNMENT INSTRUCTIONS 1 ALIGNMENT FOR AM IF a Required Instruments AM IF Sweep Generator with Scope b Alignment Procedure Mode Adjustment 1 Turn on the radio 2 Connect the input of2. 34 12 52 53 64 65 70 57 63 35 38 39 42 44 55 6 31 25 26 8 28 32 36 41 45 40 54 11 61 68 37 23 4 5 7 13 20 29 48 51 58 R 15 R 2 3 19 33 43 46 50 56 62 66 67 R 18 16 17 JP 1 7 10 13 19 20 25 R 21 3 JP 11 12 15 17 18 101 JP 9 14 16 2 6 8 21 24 U U U U U U U U U U U U U U JU JI JJ JOOOOOOOOOOO rno ih W PVC 36 0 0 BLK W PVC 210 6 6 BLK W PVC 210 6 6 RED W 2 180 6 6 R W W 2 110 6 9 R B W SHIELD 2 200 6 3 PART NO MECHANICAL PARTS LIST DESCRIPTION DWG NO REMARK NO V 20J9010 20J9020 20J9030 20J9040 21B1110 21D9020 21J9010 21J9020 21J9030 21J9040 21J9050 21J9060 21J9070 21J9080 21J9090 21J9100 21J9110 21J9120 21J9130 21J9140 2262020 2308006 23J9000 24J9010 24J9020 24J9030 24J9040 24J9050 24J9060 24J9070 24J9080 24J9090 301J96A 303J96A 304J901 304J96A 1 306J901 309J96A 309J96A 1 309J96A 2 312J96A 312J96A 1 313J96A 316J96A 331J96A 333J96A 335J96A 338J96A 343J96A LAMP GUIDE DRUM SHAFT E P amp DC IN HOLDER LED HOLDER ROTARY KNOB RING BATTERY PLATE SPEAKER HOLDER TUNING VR ASS Y ROD ANT HOLDER ROD ANT TERMINAL BATTERY SCREW HOLDER HEAT SINK HANDLE SUS PLATE ROTARY KNOB RING 8 7 CLICK SPRING TPR FIX WASHER PCB BRACKET INSERT M6 NUT BATTERY SPRING BATTERY SPRING HEMELON SHEET EVA SPACER 16X105 3M468 CABINET PACKING BATTERY COVER PACKING
3. FOR AM SENSITIVITY a Required Instruments AM Signal Generator SSVM b Alignment Procedure Mode Adjustment 1 Set the power switch to ON 2 Connect a SSVM to the test point TP8 and TP9 3 Connect the output of the FM signal generator to a standard loop antenna T2 4 Set AM 600 kHz TC4 5 Adjust T2 to have a max Audio output 6 Set AM 1400 2 7 Adjust TC4 to have a max Audio output 8 Repeat steps 4 7 until best sensitivity on these two frequencies is formed c Instrument Connection O T2 O u O O 4 O AM Signal Generator SSVM Test Point TP8 The radio is located perpendicularly to the Loop Antenna Loop Antenna Test Point TP9 6 ALIGNMENT FOR AM RANGE a Required Instruments AM Signal Generator SSVM b Alignment Procedure Mode Adjustment Set the power switch to ON Connect a SSVM to the test point TP8 and TP9 Connect the output of the FM signal generator to a standard loop antenna T5 Set AM 515 kHz TC1 Adjust T5 to have a max Audio output Set AM 1750 kHz Adjust TC1 to have a max Audio output Repeat steps 4 7 until best sensitivity on these two frequencies is formed c Instrument Connection 0 0 9 9 1 1 T5 ITC1 O O O
4. the AM IF sweep generation in series with a resister of 1 2K AM T4 Ohm to the test point TP2 and TP7 3 Connect the RF output of the AM IF sweep generation in series with a resister of 2 2K ohm to another test point TP3 4 Adjust T4 to have a max output and best center marker frequency to 455kHz c Instrument Connection O O 7 O O O T4 O O O n O Test Point 455KHz Marker Test Point TP2 1 2 IF Sweep Generator 2 ALIGNMENT FOR IF a Required Instruments FM IF Sweep Generator with Scope b Alignment Procedure Mode Adjustment 1 Turn on the radio 2 Connect the input of the FM IF sweep generation in series with a resister of 1 2k T1 Ohm to the test point TP4 and TP7 T3 3 Connect the RF output of the FM IF sweep generation in series with a resister of 2 2k ohm to another test point TP5 4 Adjust T3 make curve with respect to the Center marker frequency of 10 7MHz 5 Adjust T1 have a max c Instrument Connection O O D 1 L T3 O Test Point Test Point TP4 10 7MHz Marker TP5 103pF FM IF Sweep Generator 3 ALIGNMENT FOR FM SENSITIVITY a Required Instruments FM Signal Generator SSVM
5. 40 6100141 6100143 6100144 6100146 6100148 6100149 6100151 6100152 6100154 6100156 6100159 6100160 6100165 6100194 6110194 6160134 6160194 8000010 8000030 8000040 CH CC 050C 50V NPO C CH CC 102K 50V X7R C CH CC 103K 50V X7R C CH CC 104Z 25V Y5V C CH CC 105Z 10V F C CH CC 152K 50V X7R C CH CC 153K 50V X7R C CH CC 200J 50V NPO C CH CC 240J 50V NPO C CH CC 270J 50V NPO C CH CC 332K 50V X7R C CH CC 471J 50V NPO C CH CC 473Z 50V Y5V C CH CC 561J 50V NPO C CH CC 822K 50V X7R C RD 1 8W 47J T RD 1 8W 100J T CH RD 1 16W 4 7J C CH RD 1 16W 18J C CH RD 1 16W 22J C CH RD 1 16W 47J C CH RD 1 16W 100J C CH RD 1 16W 220J C CH RD 1 16W 330J C CH RD 1 16W 470J C CH RD 1 16W 1KJ C CH RD 1 16W 2 2KJ C CH RD 1 16W 2 7KJ C CH RD 1 16W 3 9KJ C CH RD 1 16W 4 7KJ C CH RD 1 16W 6 8KJ C CH RD 1 16W 10KJ C CH RD 1 16W 12KJ C CH RD 1 16W 18KJ C CH RD 1 16W 22KJ C CH RD 1 16W 33KJ C CH RD 1 16W 47KJ C CH RD 1 16W 82KJ C CH RD 1 16W 100KJ C CH RD 1 16W 270KJ C CH RD 1 16W OJ C CH JUMP OJ B CH RD 1 10W 680J A CH RD 1 10W W JUMP 5 10 0 6mm W JUMP 7 5 10 0 6mm W JUMP 10 10 0 6mm 2 1 4 1 2 1 1 4 1 1 2 1 1 2 1 1 1 2 1 1 1 6 2 6 1 1 2 6 2 3 1 1 9 NU 6 7 15 62 71 73 C 10 17 30 32 37 42 44 63 65 69 70 36 40 16 50 52 66 67 1 4 11 8 68 28 35 49 51 22 18 19 20 9 71 27 30 1 14 49 22 24 69 47
6. E O n O AM Signal Generator SSVM Test Point TP8 The radio is located perpendicularly to the Loop Antenna Loop Antenna Test Point TP9 TEST POINTS DIAGRAM MAIN PCB TOP VIEW wr sever MAIN PCB BOTTOM VIEW E PRE FCC CE presoj ma WIRING DIAGRAM TROUBLESHOOTING FLOW CHART 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 C2 and C3 Yes Check IF waveform gt Check CF1 CF2 T1 Check T3 2 Weak sensitivity in AM Yes Check the antenna circuit and Is the reception in MW band O K antenna terminal Check T4 and SFR1 15 3 Power can not be turned on Yes Check whether the pin 16 of IC5 is check sW1 6V DC Yes Check DC Jack and connecter wire Check IC6 16 ELECTRICAL PATS LIST a Teese 1010140 IC LA5003 1012050 IC LA1186N 1012071 IC NJM2100L 1013360 IC UTC TDA2822 DIP8 1013600 IC LA1805 DIP24S 1013610 IC TEA2025B PDIP 1020420 CH TR 2SA1576A R 1021080 CH TR HM772 SOT 89 1022220 CH TR 2SC4081R 1040020T DIODE 1N4148 T 1041211 DIODE 1N5821 1046011 CH DIODE MM4148 1050310 LED RED 5 137HR28DW 1059040 LED ORN RT5 137YL28DW 1110920 BAR ANT amp COIL 0920 1122271 ADJ COIL 2271 1122970 ADJ COI
7. Gate D Drain Diodes Cathode Mark 1N4148 RLS4148 A Anode C Cathode 28 SCHEMATIC DIAGRAM mon ZN OIPDJ auojsyooJg U meg
8. L 2970 1123031 ADJ COIL 3031 1123190 ADJ COIL 3190 1135902 FIXED COIL 6 8mHJ 1144160 SP COIL 4 5x3 5Tx0 7 1200560 PVC WF 420LT13 A24701S 1313625 R VR 50KB x2 1320120 S F VR 20KB A TD087P O 1612641 PCB A ATR 1 1620771 SPK3 8Q 7W 1631501 SR2612 0403 15F5B D8N144 1640060 JACK HP F 1647100 JACK DC 470AG PBT 2 0L 1664121 FILTER LT10 7MS2A10 A 1664170 FILTER LT455HW 1664222 FILTER GFMB7 1701207 CNT BASEx7P H 1704510 W ASS Y 200 2 7P 44104617 EL 104M 50V 5x11 44474617 EL 474M 50V 5x11 44105617 EL 105M 50V 5x11 44335617 EL 335M 50V 5x11 44226307 EL 226M 16V 5x11 44107217 EL 107M 10V 5x11L 44107307 EL 107M 16V 6 3x11 44227167 EL 227M 6 3V 5X11L 44227217 EL 227M 10V 6 3X11 5 2 5 44477107 EL 477M 6 3V 10x12 5 5 44477117 EL 477M 6 3V 8x11 5 3 5 44338907 EL 338M 16V 13x25 5 4501520 PS 152J 50V 46224607 224J 50V T 5003001 CH CC 030C 50V NPO C O V DND 38 39 24 26 27 48 12 13 23 29 41 45 55 59 14 33 34 46 47 61 54 53 60 21 1 1 1 1 1 1 1 1 9 2 1 1 1 1 1 1 2 1 1 2 1 1 1 1 1 2 1 1 1 2 1 1 1 1 2 1 3 2 1 3 5 5 1 1 1 1 1 2 1 OOOOOOOOOOOOOOO 9 Rmo ern JO e 5005001 5010261 5010361 5010471 5010557 5015261 5015361 5020001 5024001 5027001 5033261 5047101 5047365 5056101 5082261 6010720T 6010724T 6100108 6100115 6100116 6100120 6100124 6100128 6100130 6100132 6100136 61001
9. REW PTP 3x12 NI SCREW PTPW 3x10 NI STEELBALL 4 CRINGd 8 4 21 A3 ATR1 18 A4 ATR1 33 A4 ATR1 36 PI KNOB PVC TUNING SPKx8 F M x4 HANDLEx2 SPKx8 HANDLEx2 BACKx4 E Px1 PCBx3 CABx2 PCB HANDLE DRUM SHAFT 6v 9s 6s 69 12 OL 212 o 9v 9 08 9s 12 08 95 12 o 98 08 ze ze ss 98 92 ez 1 65 85 82 se 9L 68 9L LL 95 OL 69 65 lv SL 29 09 SL z9 eL 09 ve 82 SL 85 LS Le 9 55 09 19 z 19 or m LL vc el 9c 29 SL 29 SL 69 95 95 ov 9s ez ss 95 95 99 ss ze ze ze 08 12 08 95 12 08 12 2 99 6r 19 19 sb 4S 4S sy tv vi ec ev 8v Le 25 IC CIRCUIT BLOCK DIAGRAM 1 IC1 LA1805 zz E 2 IC2 TDA2822 OUTPUT1 OUTPUT2 23 3 LA1186N 4 IC4 NJM2100L 24 5 105 TEA2025B GND Sub 1 FEED ono dl EN i 500 EFR EFR START U BOOT 2 OUT 2 6 IC6 LA5003 25 IC AND TRANSISTOR VOLTAGE CHART IC1 LA1805 IC2 TDA2822 IC5 TEA2025B 26 Transistor 27 Semiconductor Lead Identification Transistors C B C E B E HM772 2564081 2501048 25 1576 E Emitter C Collector B Base S Source G
10. SPEAKER PACKING SPK COVER PACKING ROD ANT PACKING BAND PACKING SPK SCREW PACKING VOLUME PACKING SPK COVER amp CAB PACKING FRONT CABINET BACK COVER BATTERY COVER COVER FIX PLATE FRONT PANEL PLATE HANDLE BAR HANDLE HOLDER R HANDLE HOLDER L TUNING KNOB POINTER KNOB BAND KNOB VOLUME KNOB FRONT CABINET CUSHION BACK COVER CUSHION E P amp DC IN CUSHION FRAME METAL SPEAKER GRILL 20 DPD m m m m m 2 m m m m m m m 0 10 m m 1 A PP m m A4 ATR 17 A4 ATR1 16 A2 ATR1 14 LED 16A A4 330 38 A4 ATR1 20 A2 ATR1 27 A4 ATR1 29 A4 ATR1 35 A4 ATR1 31 A4 ATR1 39 A4 ATR1 40 A4 ATR1 44 A4 ATR1 43 A4 ATR1 45 A4 ATR1 41 A3 ATR1 21 A4 ATR1 22 A4 ATR1 23 A4 ATR1 25A A4 ATR1 25 A4 ATR1 25A A4 ATR1 25 A4 ATR1 25A A4 ATR1 25 A1 ATR1 02 A1 ATR1 04 A2 ATR1 06 A3 ATR1 07 A3 ATR1 30 A3 ATR1 12 A3 ATR1 13 A3 ATR1 13 A4 ATR1 08 A4 ATR1 10 A4 ATR1 11 A4 ATR1 09 A2 ATR1 03 A2 ATR1 05 A4 ATR1 19 A4 ATR1 28 A4 ATR1 26 FOR BACK CAB 12 Ne PART NO DESCRIPTION DWG NO REMARK 343J96A 1 360J96A 9001052 9002042 9013101 9054121 9076146A 9076426 9093096 9096106A 9103122 9153102 9994007 9998404 SPEAKER PANEL ROD ANT SCREW JMP 2x5 NI SCREW JMP 2 6x4 NI SCREW JMF 3x10 ZK SCREW JMP 4x12 ZK IN HEXAGON SCREW M6x14 IN HEXAGON SCREW M6x42 BAT COVER FIXBAR IN HEXAGON SCREW M6x10 SC
11. Service Manual U2 AM FM STEREO 2 BANDS RADIO RECEIVER CONTENTS Specification Despues AA dne dera 2 3 Block Diagram IEEE 4 Alignment InstrucUoNsS sro uluya A in 2 10 Tes Points uuu Mek ede Do ee aa 11 Main VIEW w saga te gani 12 Bottom VIEW o 4 iaa 13 14 Troubleshooting Flow Chart 5 NE UE delj 15 16 Electrical Parts aa ve OO A nenne 17 19 Mechanical Parts uuu uu nta Aa nme 20 21 Exploded AIT LRL 22 IC Circuit Block Diagram a aaa aaa Aa aaa aaa aaa eme meme messes sese seme sese ens 23 25 le and Transistor Voltage Chart rere inen CHR EAR A 26 27 Semiconductor Lead sess me m se ese nenne reser 28 Schematic DIAM era pA Uem Gen ele ten 29 SPECIFICATION FM ELECTRICAL PERFORMANCE Model U2 Brand SANGEAN ROBERTS Temp 25 R H 75 Date 2003 9 9 Condition Value Test No Test Item Unit Input Output fr
12. b Alignment Procedure Mode Adjustment Set the power switch to ON Connect a SSVM to the test point TP8 and TP9 Connect the output of the FM signal generator to the test point TP5 and 7 L2 Set FM 90 MHz TC2 Adjust L2 to have a max Audio output Set FM 106 MHz Adjust TC2 to have a max Audio output Repeat steps 4 7 until best sensitivity on these two frequencies is formed c Instrument Connection O H NT L2 O O z KAB O O KI AM Signal Generator SSVM Test Point TP5 gt Test Point TP8 103pF O Test Point TP9 TP7 4 ALIGNMENT FOR FM RANGE a Required Instruments FM Signal Generator SSVM b Alignment Procedure Mode Adjustment Set the power switch to ON Connect a SSVM to the test point TP8 and TP9 Connect the output of the FM signal generator to the test point TP5 and 7 L3 Set FM 87 MHz TC3 Adjust L3 to have a max Audio output Set FM 108 5 MHz Adjust TC3 to have a max Audio output Repeat steps 4 7 until best sensitivity on these two frequencies is formed c Instrument Connection H O 2 9 9 11 rej 5 O pr O O O AM Signal Generator SSVM Test Point TP5 gt Test Point TP8 103pF O Test Point TP9 TP7 5 ALIGNMENT
13. eq Nom Lim 1 s Min 87 0 2 MH RARR Max 108 5 0 3 Intermediate freq 10 7 0 1 MHz 90 12 18 Max Sensitivity S N 6dB 98 12 18 dB 106 12 18 90 18 24 Usable Sensitivity S N 30dB 98 18 24 dB 106 18 24 Image Rejection 127 4 106 32 26 dB L F Rejection 10 7MHz S N 6dB 90MHz 60 S0 dB 3db Limiting 1mV 98MHz 18 24 dB Min output 60dB 98MHz 3 5 mv Tuning Ind Sens 98MHz 18 24 dB Current consumption 60dB 98MHz 150 180 mA AFC action range 60dB 98MHz 500 200 kHz Stereo separation IKHz headphone grip 98MHz 28 22 dB outpu Stereo sensitivity headphone 5 22 28 dB Spurious rejection103 35MHz 60dB 98MHz 60 50 dB S N Ratio 60dB DIN Audio 98MHz 46 40 dB Am suppression 60dB 98MHz 36 30 dB Speaker 4 Mod 75kHz peaker SAR 98MHz 2 0 1 8 w Output Power 1kHz 32 8 8 5 5 mW Mod 22 5kHz VOL R 4 Output Power 1kHz MAX MEA T H D 75KHz dev 1mV 98M Hz 1 2 Over load capacity 10 THD 98MHz gt 106 dB 90M Calibration 98M 1000 KHz 106M Lowest Batt volt LED OFF ON 60dB R O 4 0 4 2 v Audio Fidelity 3dB De emphasis LOW 35 75 Hz W Pre emphasis 50uSec HIGH 15k 12k Bass booster action 1KHz 80Hz 14 3 VOLUME AT CENTER dB POSITION 30Hz 6 3 Supply Voltage DC 6V R O 50mW Load 4 Ohm Modulation Dev 22 5kHz 1kHz emark Approved by Released Tested by w AA SY w C MW ELECTRICAL PERFORMANCE
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