Sangean U3 Service Manual
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Sangean U3 Service Manual

Sangean U3 Service Manual

Am/fm 2 bands digital tuning radio receiver
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See also: User Manual
U3
AM/FM 2 BANDS
DIGITAL TUNING RADIO RECEIVER
CONTENTS
Specification .....................................................................................................................2-4
Block Diagram .....................................................................................................................5
Alignment Instructions............................................................................................................6-10
Test Points Diagram.................................................................................................................11
Main PCB Top View.................................................................................................................12
Main PCB Bottom View..............................................................................................................13
Control PCB Top View..............................................................................................................14
Control PCB Bottom View.........................................................................................................15
Power PCB View...................................................................................................................16
Wiring Diagram............................................................................................................17
Troubleshooting Flow Chart.....................................................................................................18-19
Electrical Parts List.............................................................................................................20-23
Mechanical Parts List............................................................................................................24-25
Exploded Views........................................................................................................................26
IC Circuit Block Diagram......................................................................................................27-32
IC and Transistor Voltage Chart..............................................................................................33-37
Semiconductor Lead Identifications...........................................................................................38
Schematic Diagram.............................................................................................................39

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Summary of Contents for Sangean U3

  • Page 1: Table Of Contents

    AM/FM 2 BANDS DIGITAL TUNING RADIO RECEIVER CONTENTS Specification ………………………………………………………………………………………………………2-4 Block Diagram ………………………………………………………………………………………………………5 Alignment Instructions………………………………………………………………………………………………6-10 Test Points Diagram…………………………………………………………………………….……….……………11 Main PCB Top View…………………………………………………………………………….……….……………12 Main PCB Bottom View.………………………………………………………………………….……..………..…..13 Control PCB Top View……………………………………………………………………………….………….……14 Control PCB Bottom View……………………………………………………………………………………………15 Power PCB View…………….………………………………………………………………………………………16 Wiring Diagram..….………………………………………….………………….….……………..……….17 Troubleshooting Flow Chart..….………………………………………….……………….….……………..……18-19 Electrical Parts List………………………………………………………………………………..……………20-23 Mechanical Parts List…………………………………………………………………….………….…………….24-25 Exploded Views.…………………………………………………………………………….…………….……………26...

  • Page 2: Specification

    SPECIFICATION FM. ELECTRICAL PERFORMANCE Temp: 25 ℃ Model: U3 (EUR) Brand: SANGEAN R. H. : 75 % Date:2006/2/20 Condition Value Test No. Test Item Unit Input Output freq Nom. Lim. ±0.1 87.5 S/N=6dB Tuning Range ±0.1 S/N=6dB ±0.1 Intermediate freq.
  • Page 3 SPECIFICATION MW ELECTRICAL PERFORMANCE Temp: 25 ℃ Model: U3(EUR) Brand: SANGEAN R. H. : 75 % Date:2006/2/20 Condition Value Test No. Test Item Unit Input Output Freq. Nom. Lim. ±1 Min. S/N=6dB Tuning Range ±1 Max. 1629 S/N=6dB ±1 Intermediate freq.

  • Page 4: Specification

    SPECIFICATION AUX-IN ELECTRICAL PERFORMANCE Temp: 25 ℃ Model: U3 (EUR) Brand: ALL R. H. : 75 % Date:2005/12/23 Condition Value Test No. Test Item Unit Input Output Freq. Nom. Lim. AUX IN=0.5V/100Hz AC Output Power THD=10% Output=R.0 (ATT=0) AUX IN...

  • Page 5: Block Diagram

    BLOCK DIAGRAM...

  • Page 6: Alignment Instructions

    ALIGNMENT INSTRUCTIONS 1. ALIGNMENT FOR AM a. Required Instruments: AM IF Sweep Generator with scope b. Alignment Procedure Mode Adjustment Procedure (1) Press the power button to turn on the radio. (2) Connect the input terminal of AM IF sweep generator in series with a resistor of 1.2KΩ to the C28 positive and TP14.
  • Page 7 2. ALIGNMENT FOR AM TUNING VOLTAGE RANGE a. Required Instruments: b. Alignment Procedure Mode Adjustment Procedure (1) Turn on the radio. (2) Connect the probe of DVM to the test point TP19 and TP14. (3) Tune the AM frequency to 520 kHz. (4) Adjust L3 to have a reading of 1.2 ±0.2V.
  • Page 8 3. ALIGNMENT FOR FM TUNING VOLTAGE a. Required Instruments b. Alignment Procedure Mode Adjustment Procedure (1) Turn on the radio. (2) Connect the probe of DVM to the TP19 and TP14 (3) Tune the FM frequency to 108MHz. (4) Adjust L2 to have a reading of 8.2V ±0.2V. (5) Tune the FM frequency to 87.5MHz.,check and have a reading of 1.9V ±0.2V c.
  • Page 9 4. ALIGNMENT FOR AM SENSITIVITY a. Required Instruments AM Signal Generator SSVM b. Alignment Procedure Mode Adjustment Procedure (1) Turn on the radio. (2) Connect a SSVM to the speaker TP8 and TP9 terminals. (3) Connect an AM signal generator together with standard loop dummy antenna and feed 30% modulated signal to the AM ferrite (4) Tune the generator frequency to 1404 kHz.
  • Page 10 5. ALIGNMENT FOR FM TUNING SENSITIVITY a. Required Instruments FM Signal Generator (frequency range up to 220 MHz) SSVM b. Alignment Procedure Mode Adjustment Procedure (1) Turn on radio. (2) Connect a SSVM to speaker TP8 and TP9. (3) Connect a FM signal generator to TP2 and TP1. (4) Set the signal generator to 22.5 kHz deviation with 1 kHz modulation.

  • Page 11: Test Points Diagram

    TEST POINTS DIAGRAM...

  • Page 12: Main Pcb Top View

    MAIN PCB TOP VIEW...

  • Page 13: Main Pcb Bottom View

    MAIN PCB BOTTOM VIEW...

  • Page 14: Control Pcb Top View

    CONTROL PCB TOP VIEW...

  • Page 15: Control Pcb Bottom View

    CONTROL PCB BOTTOM VIEW...

  • Page 16: Power Pcb View

    POWER PCB VIEW...

  • Page 17: Wiring Diagram

    WIRING DIAGRAM...

  • Page 18: Troubleshooting Flow Chart

    TROUBLESHOOTING FLOW CHART ( 1 ) Weak sensitivity on FM mode Check whether the sensitivity is Check the antenna terminal and recovered if antenna is directly antenna circuit. connected to the point between C4 and C5. Check T2 and CF3. Check waveform.
  • Page 19 ( 3 ) Power can not be turned on Check whether the pin8 of IC3 Is Check IC6. 9V DC. Check DC jack and connecter wire. Check whether Q7 is OK.

  • Page 20: Electrical Parts List

    TC 1-3, 1316625-A VR 50KB RV110TF-125A VR 701, 1316715-A VR 50KA RV110F-125A VR 700, 1600670-A LCD PR-D4 20661TF 1613501-A PCB A U3 1613510-A PCB C U3 1613520-A PCB P U3 1620740-A SPK 6.5" 8Ω 15W(MAX) 1621090-A SPK 20mm 16Ω 0.4W BUZZ 1630680-A TACT SW 100±50gf7mm...
  • Page 21 ELECTRICAL PARTS LIST PART NO DESCRIPTION Q'TY REMARK 1700550-A CNT BASE 2.5x4P CON3, 1700560-A CNT BASE 2.5x5P CON202, 1701002-A CNT BASE 2x2P CON201,203, 170100D-A CNT BASE 2x13P CON200, 1701624-A HEADER 3.96x4P CON301, 1704660-A FM ANT W/ASS'Y 320mm 1p W 2, 1704800-A W/ASS'Y 250(2+2P) W 201,...
  • Page 22 ELECTRICAL PARTS LIST PART NO DESCRIPTION Q'TY REMARK 5447101-A CH CC 471J 50V NPO-C C 10,49,59, 5468371-A CH CC 683Z 25V Y5V-C C 71, 5610262-A CH CC 102M 50V X7R-B C 17, 5610471-A CH CC 104Z 25V Y5V-B C 232, 6010530-A RD 1/8W 330J SM5 R 70,...

  • Page 23: Electrical Parts List

    ELECTRICAL PARTS LIST PART NO DESCRIPTION Q'TY REMARK 6180136-A CH RD 1/10W 1KJ-A R 52,62, 644070D-A RDF 1W 2J-T R 67, 6500440-A CH RP 2.2KJx4-C RP 201-206, 8000010-A W/JUMP 5(10)0.6mm JP 12,600,701, 8000030-A W/JUMP 7.5(10)0.6mm JP 1-4,9-11,13-18,21,36 8000040-A W/JUMP 10(10)0.6mm JP 5-8,19,20,22,29,34, 8175742-A W/PVC 270(6+6)RED...

  • Page 24: Mechanical Parts List

    MECHANICAL PARTS LIST Ref no PART NO. DESCRIPTION Q'TY DWG NO. REMARK 20K4004A LCD LIGHT LENS A4-RD2-04A 20M3010-A LED COVER A4-RD15-19 20N2000-A CONDUCT RUBBER HOLDER A4-PRD4-02 20N2010-A BAR ANT HOLDER A4-PRD4-03 20PL000-A RUBBER KEY HOLDER A2-PL02A 20PL010-A LED LENS A4-PL-06A 20PL020-A LAMP WINDOW A3-PL-07A...
  • Page 25 MECHANICAL PARTS LIST Ref no PART NO. DESCRIPTION Q'TY DWG NO. REMARK 347K901-2-A DOOR LOCK KNOB HOLDER A3-TONE-08A 347K902A-A WIRE DOOR A1-TONE-03A 348K901-A WIRE TUBE A1-TONE-06A 349K901-A PVC PLATE A4-TONE-46A 360K96D-A ROD ANT 374K901A-A DC JACK CAP A4-TONE-29A 374PL01-A JACK COVER RUBBER A2-PL-11A 9063062-A SCREW JMB 3.0x6(NI)

  • Page 27: Ic Circuit Block Diagram

    IC CIRCUIT BLOCK DIAGRAM 1. IC1 – LA1186N 2. IC2 – TA2099F...
  • Page 28 3. IC3 – TDA7266L 4. IC4 – TC4066BP...
  • Page 29 5. IC5 – NJM2100L 6. IC6 & IC8 – BA 09FP...
  • Page 30 7. IC7 – XC6366B103 MRNSOT25 8. IC9 – XC61CN6002MRN...
  • Page 31 9. IC10 – XC62FP6002PRN 10. IC201 – XC62FP3002PRN...
  • Page 32 11. IC200 – TC9318AFAG...

  • Page 33: Ic And Transistor Voltage Chart

    IC AND TRANSISTOR VOLTAGE CHART IC1 – LA1186N IC2 – TA2099F 1.04 1.82 1.82 1.13 1.14 1.74 0.04 1.85 1.82 0.63 5.93 0.02 0.02 0.33 0.34 1.82 1.82 4.73 1.24 0.88 1.07 1.08 5.93 0.02 0.02 5.95 5.98 0.33 1.31 1.79 0.44 0.02...
  • Page 34 IC6 – BA09FP IC7 – XC6366B103 IC8 – BA09FP 8.61 8.64 8.65 0.08 8.48 8.52 8.56 IC9 – XC61CN6002MRN IC10 – XC62FP6002PRN IC201 – XC62FP3002PRN 8.60 8.64 8.62 8.48 8.51 8.59 3.02 3.02 3.02 7.88 8.02 8.04 6.06 6.06...
  • Page 35 IC200 – TC9318AFAG 1.51 1.49 1.49 1.50 1.49 1.49 1.51 1.50 1.49 1.50 1.49 1.49 1.51 1.50 1.49 1.49 1.49 1.49 1.50 1.49 1.49 1.49 1.49 1.49 1.50 1.49 1.49 2.77 2.82 2.78 1.50 1.49 1.49 1.38 1.40 1.37 1.50 1.49 1.49 1.50...
  • Page 36 Transistor 6.06 6.06 6.06 1.01 0.99 5.95 5.98 5.98 5.38 5.39 5.39 5.27 5.82 0.38 7.60 0.09 0.18 0.12 5.93 8.20 0.57 0.56 0.56 5.95 5.98 8.21 0.57 0.56 0.56 0.65 0.64 0.65 0.61 0.59 0.18 0.65 0.64 0.65 0.61 7.93 8.00 8.00...
  • Page 37 Transistor 2.77 2.80 2.82 Q207 5.64 5.74 5.69 Q211 Q215 3.02 3.02 3.02 0.44 0.44 0.43 Q208 2.77 2.84 2.82 Q212 7.04 7.09 7.05 Q216 0.66 0.42 0.42 0.42 0.95 0.95 0.95 0.37 0.37 Q209 0.44 0.44 0.44 Q213 0.40 Q217 0.42 0.42...

  • Page 38: Semiconductor Lead Identifications

    SEMUCONDUCTOR LEAD IDENTIFICATIONS Transistors 2SC4154 2SB1386Q 2SC2223 2SA1611 2SB815 XP162A12A6PR 2SK212 2SB808F (E:Emitter C:Collector B:Base) Diodes RLS4148 1SS367 1N5821 1SS314 1N5817 FR204 1SV101 KV1610S ZENER RD15 ZENER 9.1V (A:Anode C:Cathode)

  • Page 39: Schematic Diagram

    SCHEMATIC DIAGRAM...

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