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tykservice manual download site
And then for the power amplifier Board repair, it is necessary to check which parts are damaged, was damaged for some reason, at the amplifier tubes are pushing levels of magnification, if testing is not complete, the new component will continue to burn after the back part, or you can try with low-voltage machines, not easy to extend fault. Second, replacing power tubes to get clarity about models and parameters, better to use the original tube, do not easily substitute, MOSFET amplifier circuits now use more and more, never used transistors instead.tykservice manual download site
For the Onkyo amplifier powers up correctly but silent failure of repair, especially the AV amplifier, both before and after judgment questions should first be grade separated input external signal level can easily be detected after the level is good or bad, also, interface input signal from the power amplifier itself, using Oscilloscopes are relatively easy to measure the fore's quality.tykservice manual download site
tykservice manual download site
Regarding the maintenance of Onkyo amplifier decoder Board failure, Onkyo amplifier failure generally, small-signal, low-voltage circuit fault failure rate is higher than that of high-voltage circuit, such as decoders, CPU boards, the display panel. Should be confirmed before judging the decoder Board failure, signal source selection menu, Panel operations these factors are not human error, various voltage supply is normal, because in practice the maintenance work, the chances of decoding chip damage is very small, mostly because the power supply is not normal, or caused by incorrect operation, except for the HDMI interface is damaged.tykservice manual download site
Amplifier of maintenance records is is important of, on like people in hospital doctor, doctor to asked clearly history, and allergy history as, if is user himself or in another of place maintenance not fruit of machine, that will carefully of check has, has a Adventist bridge TX-SR555 amplifier is such, machine main first himself repair, for has two on new tube are to breakdown, only sent to maintenance department to. Repair only after know its final two 1N4148 breakdown on the current-biased tube circuit together immediately after the new normal. Right of overhaul method is first removed bad tube, only put promoted tube loaded Shang can, can first not loaded late level zoom tube, Figure 1 and Figure 2 is DC amplifier late level typical circuit, in Figure 1 in the, put Q1, and Q2 removed, except amplifier output power variable small has zhiwai, does not effects circuit of performance, so we can using this, in maintenance Shi take off Q1, and Q2, only loaded Q3, and Q4, that promoted tube, then overhaul, stay identified problem, power debugging all normal Hou, again put amplifier tube loaded Shang, such on can as avoid loss. Author repair amp this way, were successful. Therefore, I think it is the maintenance of a safe and practical way. Changed figure 1 figure 2 circuit maintenance model, to be repaired when they return. In addition, the overhaul is the best for low-voltage power supply, ± 12V~ ± 15V, it's safer, after normal pick up again after the main electrical source.
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