Sangean DT-120 Service Manual
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Sangean DT-120 Service Manual

Fm stereo/am/tv radio
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Table of Contents

See also: Operating Instructions , User Manual
DT-120
FM STEREO/AM/TV RADIO
CONTENTS
Specification .....................................................................................................................2-3
Block Diagram .....................................................................................................................4
Alignment Instructions...............................................................................................................5-8
Test Points Diagram.................................................................................................................9
PCB Top View.................................................................................................................10
PCB Bottom View..............................................................................................................11
Wiring Diagram............................................................................................................12
Troubleshooting Flow Chart.....................................................................................................13-14
Electrical Parts List.............................................................................................................15-16
Mechanical Parts List...............................................................................................................17
Exploded Views........................................................................................................................18
IC Circuit Block Diagram......................................................................................................19-20
IC and Transistor Voltage Chart..............................................................................................21-22
Semiconductor Lead Identifications...........................................................................................23
Schematic Diagram.............................................................................................................24

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Summary of Contents for Sangean DT-120

  • Page 1: Table Of Contents

    DT-120 FM STEREO/AM/TV RADIO CONTENTS Specification ………………………………………………………………………………………………………2-3 Block Diagram ………………………………………………………………………………………………………4 Alignment Instructions…………………………………………………………………………………………………5-8 Test Points Diagram…………………………………………………………………………….……….……………9 PCB Top View…………………………………………………………………………….……….……………10 PCB Bottom View.………………………………………………………………………….……..………..…..11 Wiring Diagram..….………………………………………….………………….….……………..……….12 Troubleshooting Flow Chart..….………………………………………….……………….….……………..……13-14 Electrical Parts List………………………………………………………………………………..……………15-16 Mechanical Parts List……………………………………………………………………….………….…………….17 Exploded Views.…………………………………………………………………………….…………….……………18 IC Circuit Block Diagram…………………………………………..…………….………………………………19-20 IC and Transistor Voltage Chart….……………………………..…………………………….…………………21-22 Semiconductor Lead Identifications……………………………………………………………………..……..…23...

  • Page 2: Specification

    S P E C I F I C T I O N . F M E L E C T R I C A L P E R F O R M A N C E M o d e l : D T - 1 2 0 ( E U R ) B r a n d : T e m p : ¢...
  • Page 3 S P E C I F I C T I O N . A M E L E C T R I C A L P E R F O R M A N C E M o d e l : D T - 1 2 0 ( E U R ) B r a n d : T e m p : ¢...

  • Page 4: Block Diagram

    BLOCK DIAGRAM...

  • Page 5: Alignment Instructions

    ALIGNMENT INSTRUCTIONS 1. ALIGNMENT FOR TUNING CAPACITOR VOLTAGE RANGE Required Instruments Signal Generator SSVM Alignment Procedure Mode Adjustment Procedure (1) Set the power switch to ON. (2) Connect a SSVM to TP1. (1) Tune FM to 108 MHz. (2) Adjust L2 to have a reading of 7.8V on the SSVM. Instrument Connection SSVM...
  • Page 6 2. ALIGNMENT FOR FM SENSITIVITY Required Instruments Signal Generator SSVM Alignment Procedure Adjustment Mode Procedure (1) Set the power switch to ON. (2) Connect a SSVM to the HEAD PHONE JACK O/P. (3) Connect the output of the FM signal generator to the test point (TP5). (4) Set FM to 106MHz.
  • Page 7 3. ALIGNMENT FOR TUNING CAPACITOR VOLTAGE RANGE Required Instruments Signal Generator SSVM Alignment Procedure Mode Adjustment Procedure (1) Set the power switch to ON. (2) Connect a SSVM to TP1. (1) Tune AM to 1629 KHz. (2) Adjust L1 to have a reading of 6.1V on the SSVM. Instrument Connection SSVM...
  • Page 8 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 H.P JACK and GND terminals. (3) Connect an AM signal generator together with standard loop dummy antenna and feed 30% modulated signal to the AM ferrite bar antenna (ANT1).

  • Page 9: Test Points Diagram

    TEST POINTS DIAGRAM Gray = Bottom layer Yellowish brown = Top layer...

  • Page 10: Pcb Top View

    PCB TOP VIEW...

  • Page 11: Pcb Bottom View

    PCB BOTTOM VIEW...

  • Page 12: Wiring Diagram

    WIRING DIAGRAM Gray =Top layer Yellowish brown = Bottom layer...

  • Page 13: Troubleshooting Flow Chart

    TROUBLESHOOTING FLOW CHART ( 1 ) Power can not be turned on Check whether the R66 exceeds Check whether L9 is normal. 1.5V DC (VCC). Press the Lock key and other key Check whether R7, R8, R10 and R11 check whether the pin 11, 12, 13, 14 voltage.
  • Page 14 ( 3 ) Weak sensitivity on AM mode Check whether the sensitivity is Check the antenna wire and Q1 recovered if antenna is directly circuit. Then replace the abnormal connected to the pin29 of IC1. parts. Check whether the IF waveform is Check the IC1 circuit.

  • Page 15: Electrical Parts List

    ADJ COIL FT12NP-45-F2 L 3, 11313A0K-A CH INDUCTOR 1uHK-A L 6-10, 1210310-A CH TC 20P RED 3mm CT 1, 1600770-A LCD SV-NS1655BPTZ DT-120 LCD1, 1613402-A PCB A DT-120 1631140-A CH SLIDE SW.1P2C SW 1, 1631350-A SLIDE SW 1P2C SW 2,...
  • Page 16 ELECTRICAL PARTS LIST DT-120 PART NO DESCRIPTION Q'TY REMARK 5447261-A CH CC 472K 50V X7R-C C 53,54, 5447472-A CH CC 474Z 16V Y5V-C C 23,31,36,37,48,50, 5456001-A CH CC 560J 50V NPO-C C 80, 5468351-A CH CC 683K 16V R-C C 39,...

  • Page 17: Mechanical Parts List

    MECHANICAL PARTS LIST DT-120 Ref no PART NO. DESCRIPTION Q'TY DWG NO. REMARK 21P7000-A LCD HOLDER A3-DT120-12A 21P7010-A LCD HOLDER SHELD A4-DT120-13A 21P7020-A BATTERY CON+ A4-DT120-14A 21P7030-A BATTERY CON- A4-DT120-15A 21P7060-A SHIELD-A A4-DT120-23A 21P7070-A SHIELD-B A4-DT120-24A 24P7000-A CONDUCT RUBBER A4-DT120-22A...

  • Page 19: Ic Circuit Block Diagram

    IC CIRCUIT BLOCK DIAGRAM 1. IC1 – TA2142FNE 2. IC3 – AN7504SB...
  • Page 20 3. IC2 – TC9349AFG...

  • Page 21: Ic And Transistor Voltage Chart

    IC AND TRANSISTOR VOLTAGE CHART IC1 – TA2142FNE 0.09 1.48 1.48 0.56 0.55 1.48 1.48 1.43 1.48 1.48 1.48 1.48 0.77 0.93 0.46 1.48 1.48 1.48 1.48 0.47 0.09 0.09 0.24 0.24 0.87 0.87 0.88 0.02 0.02 0.91 0.91 0.87 1.48 1.48 0.10...
  • Page 22 IC3 – AN7504SB 0.49 0.48 0.01 0.74 0.74 0.54 0.54 0.74 0.74 0.73 0.73 0.69 0.69 0.74 0.74 1.56 1.56 0.74 0.74 0.75 0.75 1.29 0.55 0.54 0.74 0.74 0.76 0.76 0.89 0.91 1.51 1.51 0.74 0.74 0.75 0.75 1.48 1.48 1.48 1.49...

  • Page 23: Semiconductor Lead Identifications

    SEMUCONDUCTOR LEAD IDENTIFICATIONS Transistors 2SB1295 2SK932 HN2C01FU 2SC4177 1. EMITTER 1 2SC3142 2. EMITTER 2 2SD1048 3. BASE 2 4. COLLECTOR 2 5. BASE 1 6. COLLECTOR 1 UNR5110 UNR5113 UNR5210 (E:Emitter C:Collector B:Base S:Source G:Gate D:Drain) Diodes 1SS357 PSD501H SVC383 ZENER RD12 SVC220...

  • Page 24: Schematic Diagram

    SCHEMATIC DIAGRAM...

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