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Panasonic A300MU type DVD drive and repair the power circuit

Is transducers 8 range, which is achieved by the binary encoding electronic / acoustic transformation of the intrinsic nature of one dollar can only use the system to achieve single transducer. Figure B shows the specific arrangements. In Figure B, to 256 single transducer arranged for a group of several groups of the array, can be even burst. 8-bit resolution for the use of 256 transducers to achieve signal / sound signal ● Ma Liang's transformation, if the map the surface of a total of N group B the total number of transducer resolution Nx256 Although this speaker is only very at 8 bits. But through the use of CD-44, lkHz 8 times the sampling rate of sampling and interpolation methods to improve upon their fidelity and no less than 16-bit CD quality that ocean. Digital signal is not every 22.7p. s sent 16-bit, but every 57V. s or 28s send 8 bits, so that the original signal than the more bits sent per second: According to the company that made use of this principle than the traditional analog system is more effective Hooley speaker digital speaker admits that the sample also unsatisfactory, poor sound did not find the right key to the transducer and the production of the company is looking for a better transducer, and continue to develop the technology itself became the ultimate digital loudspeaker manufacturer qualified does not shine , failure to open some time off repeated. Maintenance sub-fold: to determine,[link widoczny dla zalogowanych], according to analysis of the phenomenon may be the power supply circuit caused by a high thermal stability worse. Unloading the boot lid, boot until power failure occurs, measured thick film circuit IC10l1 of ①, ② pin voltage, respectively, +300 V and OV (normal to 260V and 024 ~). The phenomenon indicates that switching power supply to stop vibration, check the starting circuit components are a good measure of the other foot I ICI A pair of voltage, we found that failure occurs in the pin voltage is 2v ICIOI1 ⑥ about l normal to 05V). Which shows the power to stop vibration is due to lC1 A pair of I ⑥ feet higher than normal voltage caused can be seen from Figure l, IC1011 ⑥ pin voltage and the 17V power supply circuit on, check the circuit D103I, C1031 did not find significant problems. Test for capacitance C103l, the fault disappears, the machine work back to normal. Example 3 Symptom: After power on, the machine working properly, but after about five minutes, maps, sound disappeared, VFD screen display has been the normal analysis of maintenance: maintenance experience because it provides more power circuit problem audio / video signal processing the power supply circuit in part by IC1l21, ICIl11 and composition of external components, which are output +5 v and +3.3 V voltage supply MPEG-2 and AC-3 decoder. 2 cut out the amount of IC1121 ③ pin outputs +5 v voltage is normal, but by the IC1111 ③ pin output +33 V voltage failure appears to 15V or so, the abnormal voltage will directly affect the MPEG A 2, AC-3 decoder to work properly, causing no figure , a silent failure. Work due to a fault is occurring after a period of time. Estimated to be +3.3 V power supply circuit components for the power-I due to deterioration of performance after. Check capacitor C1114 is good, but found work IC1111 five-side power regulator block fast and high temperature, therefore to judge the performance deterioration of ICI】 11. Renewal ICI111 (SI3033C) after troubleshooting. Down 4 Symptom: boot cut, images, sound are normal, but for about 5-7 minutes. Sound disappears, the image has been normal. Analysis of repair: analysis of this phenomenon,[link widoczny dla zalogowanych], according to audio signal processing circuit judge, or to provide power circuit failure. Unloading the boot lid, locate the connector P24104 measure @, @ foot R, L audio signal input 0.6V voltage is normal, and then test the plug-P24003 ③, @ pin, found that the feet no audio signal output. Which determine the audio decoding circuit is normal, the problem may be behind in the P24104 circuit, measuring] CA761 (NJM4580l buffer input stage ②, ⑥ feet. With audio signal input, and then the side IC4761 of ①, ⑦ feet but no audio signal output,[link widoczny dla zalogowanych], indicating] CA761 after the machine is not working properly carry it off and then start measuring 1C4761 to ④, ⑥ supply voltage pin, found ⑧ pin +9 v voltage, the normal boot cut, but with the boot time The pin voltage is slowly decreased,[link widoczny dla zalogowanych], and accompanied by the examination of the feet jitter = external components, suspected capacitor C4761 (16v/l00p, F) power leakage phenomenon after work, so reducing the operating voltage, resulting in failure sound disappear . with a new capacitor replacement, long test machine fault disappears,[link widoczny dla zalogowanych], the machine back to normal. * Practical Audio Technology 1 51 1999
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