SP-012 Service Manual
Contents
1. 2 1 r SCI 3 3K R16 5 1 7 ROUT RS 1 2K R17 53 10u 16V cb 62 562 1 oc Tr cis 562 10u 16V 8 m c5 1000u 16V 6 22 FL402 T3 15AL250V AN lt gt LEF CUCU UU 7 BOM LIST MATERIAL CODE MATERIAL NAME SPECIFICATIONS LOCATION 2100003 CONNECTED CORDS 0 6 SHAPED 7 5mm 5 2100004 CONNECTED CORDS F0 6 SHAPED 10mm W3 2100006 CONNECTION CORDS F0 6 SHAPED 12 5mm W7 2100017 CONNECTED CORDS F0 6 SHAPED 20mm w2 0000229 0000288 1 4W3 9K 5 SHAPED 10 0000291 0210014 0210031 100V 224 10 8mm 0210056 50V 563 20 6mm 0210065 100V 562 5 3 5mm 0200111 50V 331 10 5mm 0260303 CD11 16V2200u 20 10 30 5 0260460 CD11 16V2200U 20 12x25 5 CON 2150106 3P90 2 5 2 PIN 2P SHIELD WITH NEEDLE 0260227 1 0260173 1 1 MATERIAL CODE MATERIAL NAME SPECIFICATIONS LOCATION 0000287 CARBON FILM RESISTOR 1 4W3 3K 5 SHAPED 10 0000305 CARBON FILM RESISTOR 1 4W100K 5 SHAPED 10 200378 400VAC 472 10 10mm VDE 186008 ar HABEN VDE POWER SUPPLY CORD EUROPE SPECS ear SA BOS VDE COLON COLOR ZN T SPONGE NOTOVETAL FLM RESIST2. OR GLUE LABEL FUZE 250 5448091 PCB SEMI FINISHED PRODUCT 7501 1 SP 012 RU SPEAKER BODY WITH FOAM GRAIN SP 012 RU SUBSIDIARY SHALLOW 3060534 PVC SCUTCHEON gt SILVER FUNDUS GREY FUNDUS 46 5234926 SOFT SPONGE SPACER 340x1 8x2 WHITE SINGLE FACED SOFT 3004300 PANEL SP 012 RU WHITE SP 012 RU SUBSIDIARY SHALLOW 4710200 BACKBOARD TIMBER GRAIN 260531 CD70 50V2 2U 10 DF 10 8x17 1100603 SD0421YF SP 012 RU aoza LA TT 3080499 SP 012 RU SHALLOW TIMBER GRAIN 2 4000783 PA 4 18 WHITE NICKEL 4000289 PWA 3x16x7 WHITE NICKEL 2000208 PWR NOKEL 4000191 SELF TAPPING SCREW PA 4x15 BLACK 5070680 SELF SEALED GLUE BAG FOR ENVIRONMENTAL PROTECTION 180x250x0 05 PE WORNING 5071224 GLUE BAG FOR ENVIRONMENTAL PROTECTION WITH HOLE 380x400x0 05 PE ENGLISH 5194612 USER MANUAL SP 012 ENGLISH RUSSIT mamma fs asus 5780251 SP 012 RU SHALLOW TREE VEINS 5142067 RUSSIA WITHOUT BAR CODE NUMBER 10
3. SP 012 Service Manual SP 012 Principle and Servicing 1 SP 012 working principle Signals are inputted to input board through SC1 The left channel signal arrives at pin 3 of socket 51 through R13 and then at power amplifier board through flat cable XP1 and then divides into two paths after arriving at power amplifier board one path arrives at potentiometer S2 through R2 for bass adjustment S2 is duplex potentiometer and can adjust left and right channels at the same time the other path arrives at potentiometer S1 through C21 for tweeter adjustment S1 is duplex potentiometer and can adjust left and right channels at the same time after bass and tweeter adjustment the two paths combines into one path through balance resistor R3 R5 and send to potentiometer S3 for volume adjustment 53 is duplex potentiometer and can adjust and right channels After volume adjustment signals are sent to pin 2 of U1LA4508 after R12 damping and C1 coupling for power amplifying LA4508 a dual channel power IC with fixed amplifying ratio and outputted through pin4 after amplifying output signals are sent to speaker directly after DC filtering Signal flow direction of right channel is the same as that of left channel 2 Introduction to LA4508 Output power 22Wx2 Power supply voltage 22V Pin 2 13 signalinput pin 4 Pin 4 11 signal output pin Pin 6 9 bootstrap capacitor input pin 3 Troubleshooting flow 1 Troubleshooting flow
4. for Left channel has no output os shown as the following figure 3 1 Left channel hasno output Check whether the anode wave formof capacitor C1 orC3 is normal Check whether the anode wave formof apacitor C12 orC14 is normal whether pin 1 or 3 of power amplifier board Xp1 has waveform after signal is inputted Change capacitor C16 Change R13 andR14 Change input terminal Figure 3 1 Troubleshooting flow for Left channel has no output 2 Troubleshooting flowchart for Power is shown as the following figure 3 2 Power not on whether protector tube on powercord has been burnt Check whether protector tube of power amplifier board FL402 has bee burnt down board is 22V Change U1 tosolve whether protector tube of poweramplifier board FL402 hasbee burnt down Change transformer and protector tube tosolve Check whether the impedance of power amplifier board power board and grounding wire Change U1 transformer and protector tubeto solve Figure 3 2 Troubleshooting flow chart for Power noton 4 Signal waveform diagram 1 Input waveform diagram of pin 2 of U1 VW 2 54 output signal waveform diagram 3 External input signal waveform diagram 5 circuit diagram 5630 R3 C230 5 6K 82 N 50 N 7 gt 5 6
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