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Micro Hi-Fi system BTD7170 /12/98/93
Service
Service
Service
Service Manual
TABLE OF CONTENTS
Page
location of pcb boards and version vanation......................................1
Technical specification................................................................. 2-5
Safety instruction...........................................................................6
ESD protection...............................................................................7
Safty precautions...........................................................................8
Set Block diagram..........................................................................9
Set wining diagram........................................................................10
Main /Display smps board
Circuit diagram..................................................................11-20
Layout board.....................................................................21-30
Mechanical Exploded view............................................................31
1
Location of pcb boards and version variation
SMPS Board
Main Board
Display Board
BTD7170
/93
C
C
BTD7170
/93
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
NO TEST ITEMS UNIT NOM. LIMIT
87.5
1 Fvequency Range MHz
108
90 16 22
2 26dB QUENTING SENSITIVITY 98 dBf 16 22
106 16 22
3 -3dB LIMITING POINT dBf 20 26
3 FM IF REJECTION 98MHZ S/N=26dB dB 65 60
4 IMAGE REJECT 98MHZ S/N=26dB dB 40 25
MONO 65 60
5 S/N Db
ST 65 60
6 OVERALL DISTERTION % 2 5
7 MODULATION HUM dB 50 45
30Hz _ 0