After opening the test machine, and so failure to detect, but the fault has been not appear, it is relatively difficult to repair large heated board with a hair dryer, the same is not a failure, and then close the cover, with a wire from the IC1213 (33) foot, i.e. the end RELAY lead to measurement. Found that when the foot is reduced by the failure of normal 5V 0V, so it's only based on the phenomenon should be checked empirically computer circuit blocks and related working conditions, combined with the substitution maintenance, power and reset voltage measurement IC1213 were normal, replace reset block IC1212, fitted cap test machine fault persists, replace the crystal X1210 and computers have blocks IC1213, memory IC1211, can not solve the problem, make repairs in trouble, stop and analysis: computer working conditions, next to the crystal symmetry two resonant capacitor C1209, C1210 can not be ignored, theoretical analysis, if the deterioration of this failure should occur. Remove the two capacitors, troubleshooting.FhJservice manual download site
 FhJservice manual download site

This capacitor is used to stabilize the crystal oscillation frequency, I have tried to remove the two capacitors in general, the machine can also work in the inspection of such failure does not prevent try to remove it, more convenient.FhJservice manual download site