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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