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ENGLISH

AB217

SERVICE MANUAL

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Summary of Contents for AB217

Page 1: ...ENGLISH AB217 SERVICE MANUAL...

Page 2: ...tiometer Board 8 3 2 Schematic Diagram of The Potentiometer 9 The Explanation For Key Components CONTENTS 1 2 3 4 5 6 6 6 7 7 9 10 10 11 12 13 13 14 14 15 15 16 16 16 18 19 19 22 24 24 25 26 27 NAME O...

Page 3: ...ard Control and Display Circuits Receives control commands and send control signals to achieve control function Drives the VFD screen to show the current working mode 1 Circuit Makeup This unit s circ...

Page 4: ...arison Front Panel s Function Control VFD Screen N601A N601B Simultaneous Two Lines Amplification N905 SC6931 Echo Processing MIC Muffling BLOCK DIAGRAM Figure 1 N906A Level Sampling Amplification 2 C...

Page 5: ...comparer composed of N403A The output end of N403A SEARCH is connected to the pin 28 of CPU This control signal is the search and detect signal when it is low level it enters the search mode when it...

Page 6: ...12 VCC 24 L1 IN 23 L1 OUT 22 O1 OUT 21 O1 IN 20 REF 19 CC1 18 CC2 17 O2 IN 16 O2 OUT 15 L2 IN 14 L2 OUT 13 N905 SC6931 G601 2M C628 30p C629 30p R626 15k R625 10k R634 10k R631 10k R632 10k R630 10k...

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Page 8: ...W19 W22 W29 W31 W34 W37 W38 W43 W46 W49 W52 W54 W56 W58 W62 W65 W69 W74 W75 W81 W82 W83 W90 W93 W99 W102 W103 W114 W116 W117 66 CONNECTION CORDS 0 6 SHAPED 10mm W5 W17 W18 W23 W28 W35 W36 W39 W40 W42...

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Page 10: ...nd the inphase opposition port increases to 17V the original output mode is breached and the high level cannot be sent out Therefore the VCD mode is shut off Atthis moment the high level of 17V of N90...

Page 11: ...D R VCD L DVD R VCD R DVD L TAPE R TAPE L CD L C L SL SR R FL402 T6 3A 250V FL401 T6 3A 250V X0 12 X1 14 X2 15 X3 11 Y0 1 Y1 5 Y2 2 Y3 4 INH 6 A 10 B 9 VEE 7 X 13 Y 3 16 8 N401 CD4052 C430 47u 16V R45...

Page 12: ...that output Q and Q will be divided into two lines One line is sent to the voltage comparer Another line is sent to the Pins 4 6 of the echo processing IC N905 to control the delay time of MIC signals...

Page 13: ...hieve maximum display Because the music signals are changing continuously these six illuminants will rise or fall accompanying with strong or weak music signals This is the basic working principle of...

Page 14: ...el R s output end is parallel connected with a over current sampling triode V421 R415 and R416 are over current sampling resistor When current soars up sharply due to short circuit the potential diffe...

Page 15: ...ot be connected and thus the impact current will not occur The relay will open only when the circuit works stably Therefore the protection is realized In a similar way when the circuit goes wrong and...

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