Sangean DT-120 Manual de usuario

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

SPECIFICTION.

FM ELECTRICAL PERFORMANCE

Model : DT-120 (EUR) Brand: Temp: ℃ R.H.: % Date : 2006/04/27

Condition Value Test No.

Test Item Input Output Freq. Nom. Lim. 1. 2. Unit

Min. 87.5

Tuning Range S/N=6dB Max. 108.0

MHz

Intermediate Freq. S/N=6dB 10.7 ±0.05 MHz

90 MHz 12 18

98 MHz 12 18

Max. Sensitivity S/N=6dB 106 MHz 12 18 dBu

90 MHz 18 24

98 MHz 18 24

Usable Sensitivity S/N=30dB 106 MHz 18 24 dBu

Image Rejection S/N=6dB 106 MHz 14 dB

I.F. Rejection S/N=6dB 90 MHz 50 dB

3 db Limiting 60 dBu 18 24 dBu

Min. Output 60 dBu Vol=min 0.2 0.4 mV

Auto.Scan.Stop.Sens. 18 24

dBu

Stereo Separation

(1kHz) 24 18

S/N Ratio(22.5kHz) 45 36 dB

Current Consumption

(22.5HzDev.Modulatio

n 400Hz/DBB) R.O. 35 45

Am. Suppression 32 26 dB

100 200

Audio fidelit

75KHz

dev. (-3dB W/ 50us

Pre Emphasis) 10K 8K

Output Power

(45HzDev.Modulation

400Hz/DBB) VRmax 1 0.5

DBB Action

ON / OFF(100Hz) R.O. 9 6

T.H.D.(45kHz dev.)

60 dBu

1.5 3 %

Over Load Capacity 10%T.H.D

98 MHz

110

dBu

Lowest Batt. Volt. 60 dBu 98MHz 1.05 1.10

Supply Voltage：DC 1.5 V R.O.： 0.05 mW Load： 16 Ω Modulation：1kHz/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 ( )新機種 ( )工程變更：

Approved By Released/Tested By

SPECIFICTION.

AM ELECTRICAL PERFORMANCE

Model : DT-120 (EUR) Brand: Temp: ℃ R.H.: % Date : 2006/04/27

Condition Value Test No.

Test Item Input Output Freq. Nom. Lim. 1. 2. Unit

Min. 522

Tuning Range S/N=6dB Max. 1629

KHz

Intermediate Freq. S/N=6dB 450 ±2 KHz

603 KHz 54 58

999 KHz 52 56

Max. Sensitivity S/N=6dB 1404 KHz 52 56 dBu

603 KHz 60 64

999 KHz 58 64

Usable Sensitivity S/N=20dB 1404 KHz 56 62 dBu

Image Rejection S/N=6dB 1404 KHz 36 30 dB

I.F. Rejection S/N=6dB 603 KHz 40 34 dB

Selectivity(±9KHz) S/N=6dB 26 18

dBu

Bandwidth (-6 dB) S/N=6dB 4-12

KHZ

Auto.Scan.Stop.Sens. 63 70

dBu

S/N Ratio 36 28 dB

Current Consumption R.O. 35 45 mA

50 100

Freq. Response

(-6dB)

2300 2000

Output Power

.(MOD60%) VRmax 1 0.5

Lowest Batt. Volt. . 1.05 1.10

T.H.D.(MOD60%)

74 dBu

3 5 %

Over Load Capacity 10%T.H.D

999 KHz

100 90

dBu

A. G. C. F. O. M. 100dBu 46 40

Whistle Modulation 74 dBμ

/m 2IF/3IF

15 %

Supply Voltage：DC 1.5 V R.O.： 0.05 mW Load： 16 Ω Modulation：400Hz/30%Mod.

Remark： ( )首件產品 ( )客戶抽測：

( )成品 ( )例行抽測 ( )業務樣品：

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Approved By Released/Tested By

CF1

L IN

Q13

D2 / L2D3 / L3

CF2 CF3

D1, Q1

AM RF

switch circuit

Q10

Q2 / Q11 / Q12

DBB CONTROL

R O/P

L IN

IF IN

LCD DISPLAY

Earphone

JK1

SW10 BAND

SW7 Tuning up

SW4 VOL. up

POWER SW

MEMORY

FM RF AMP

FM OSCFM RF

FM AM

ANT1, CT1,

R IN

LOW BST

FM QUAD

AM/FM BAND

MUTE CIRCUIT

R IN

L O/P

OSC IN

75KHz

X. TAL

SW9 DBB

HOLD SW

SW3

SW2

KEY

SW401 - 405

POWER CONTROL

IC3 AN7504 SB

IF FILTERIF FILTER

IC1 TA2142FN

AM/FM TUNER

D1 / L1

BATTERY x 1

SW8 Tuning DOWN

IC1 VCC CONTROL

POWER AMP

AM OSC

LPF

Q4, Q5, L5

1.5V

SW6 VOL DOWN

VOL. Control

u-COM IC

TC9349FG

POWER CONTROL

BLOCK DIAGRAM

ALIGNMENT INSTRUCTIONS

1. ALIGNMENT FOR TUNING CAPACITOR VOLTAGE RANGE

a. Required Instruments：

Signal Generator

SSVM

b. Alignment Procedure

Mode Adjustment Procedure

(1) Set the power switch to ON.

(2) Connect a SSVM to TP1.

(1) Tune FM to 108 MHz.

FM L2

(2) Adjust L2 to have a reading of 7.8V on the SSVM.

c. Instrument Connection

TP1

SSVM

2. ALIGNMENT FOR FM SENSITIVITY

a. Required Instruments：

Signal Generator

SSVM

b. Alignment Procedure

Mode

Adjustment

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.

FM L3

(5) Adjust L3 for maximum audio output.

c. Instrument Connection

Signal Generator

TP5

6pF

To Speake

HEAD PHONE JACK O/P

SSVM

3. ALIGNMENT FOR TUNING CAPACITOR VOLTAGE RANGE

a. Required Instruments：

Signal Generator

SSVM

b. Alignment Procedure

Mode Adjustment Procedure

(1) Set the power switch to ON.

(2) Connect a SSVM to TP1.

(1) Tune AM to 1629 KHz.

AM L1

(2) Adjust L1 to have a reading of 6.1V on the SSVM.

c. Instrument Connection

TP1

SSVM

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).

(4) Tune the generator frequency to 1404 KHz.

(5) Tune the AM frequency to 1404 KHz and adjust CT1 to have a max reading on SSVM.

(6) Return the generator frequency to 603 KHz.

(7) Tune the AM frequency to 603 KHz and adjust ANT1 to have a max reading on SSVM.

AM CT1

ANT1

(8) Repeat (4) to (7) as necessary to minimize tracking error.

c. Instrument Connection

ANT1

CT1

60 cm

Loop Antenna

AM Signal Generator

The radio is located

perpendicularly to

the Loop Antenna

GND

DVM

HEAD PHONE JACK O/P

Gray = Bottom layer

Yellowish brown = Top layer

TEST POINTS DIAGRAM

PCB TOP VIEW

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