According to failure phenomena estimates are synchronous separation circuit part of the performance change after an element is heated, or poor contact. Synchronous separation of part of the machine on the DG board, because of the machine to start up 2 hours or so fails, available local heating method and promote the fault occurs. In image was normal, slowly heating, electricity blow hair-dryer to DG plate when the blow to the DG board at the upper, images are not synchronized, immediately remove the ram, image quickly returned to normal. DG plate upper IC8004, the IC is synchronous signal processing function, because of the hair dryer blowing range is too big, not easy to determine the fault components, using hot air welding gun, small volume, the temperature down to the appropriateness, when blow to IC8004 and C1886 / C1887 / C1888 several components, 3 seconds fails, dip in with cotton precision of alcohol on the IC8004, at the same time more than a few tiles capacitance heating (to avoid IC8004 heating effect judgment), or malfunction soon, specify scope only on a few tiles capacitors, because several patch capacitor size is too small, hot air welding torch or failed to identify the specific parts, electric point heating, when soldering pen point touch C1887 fails, immediately remove the welding head and return to normal soon, other capacitor has no reaction, suggests C1887 poor performance after heating. Replace C1887 (after 10 u / 6.3 v), troubleshooting.3W3service manual download site