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Micro Hi-Fi system BTB7150
Service
Service
Service
Service Manual
TABLE OF CONTENTS
Page
location of pcb boards and version vanation......................................1
Technical specification.................................................................2-4
Safety instruction...........................................................................5
ESD protection...............................................................................6
Safty precautions...........................................................................7
Set Block diagram..........................................................................8
Set wining diagram.........................................................................9
Disassembly diagram....................................................................10
Main /Display board
Circuit diagram..................................................................11-17
Layout board.....................................................................18-24
Mechanical Exploded view............................................................25
1
Location of pcb boards and version variation
SMPS Board
Main Board
Display Board
BTD7150
/93
C
C
BTB7150
/93
Location of pcb boards and version variation
2 Technical specifcaicn
DTD3190 Elec parameter test Report
TEST CONDITIONS:
1.POWER SUPPLY: AC.Accordiing to Ver
2.REF OUTPUT: 4 1W , Sound effect off
3.FM MONO: 22.5KHz Dev,1KHz MODULATION ,75 IMPEDANCE ,60dBu
4.FM STEREO : MAIN+SUB = 50KHz, PILOT : 10KHz,COMPOSITE: 40.0KHz
FM SECTION
TEST DATA
NO TEST ITEMS UNIT NOM. LIMIT
#1 #2
87.5 87.5 87.5 87.5
1 Fvequency Range MHz
108 108 108 108
90.1 16 22 6 6
2 26dB QUENTING SENSITIVITY 98.1 dBf 16 22 7 6
106.1 16 22 7 6
3 -3dB LIMITING POINT dBf 20 26 -5 -4
4 FM IF REJECTION 98MHZ S/N=26dB dB 65 60 65 65
5 IMAGE REJECT 98MHZ S/N=26dB 40 25 40 40
MONO dB 65 60 73 73
6 S/N
ST 55 50 56 55
7 OVERALL DISTERTION % 1 2 0.2 0.2
8 MODULATION HUM dB 45 40 74 75
90MHz dBf _ 25-40 34 34
9 TUNING SENS 98MHz dBf _ 25-40 33 34
106MHz dBf _ 25-40 34 34
10 STEREO CHANNEL SEPARATION 1KHz dB 25 20 42 42
11 THD 10% POWER 1KHz W _ 50