In order to prevent the expansion is not allowed to use force to relay power contacts a connection of main power transformer power approach. Check the 10 amp tubes and two amplifier block is not only found the problem, find three full bridge rectifier and 6 4700~15000&mICro;F electrolysis capacity are normal. May determine the point of failure before the power amplifiers or ± 12V, 5V voltage regulator on the Board. Practice respectively disconnect 12V and 5V power supply. Locate the socket on the amplifier Board W606 above labeled ± ± ± 5V, 12V, 18V, and 4 ground terminal, and then by the regulator Board to unsolder one end of one to one root boot test after losing the outlet. When welding the ± 12V output when the auxiliary power relays on the Board is no longer protected, indicating faults within ± 12V all the way. The ± 12V output wire welded back in place, starting with the small piece of circuit board check up. Native audio signal output output there are three cable connections on the Board, one of the widest group marked +12V input terminal on the circuit board. After you unplug the cable from the socket, power on the successive outs are no longer protected, the problem is in the audio signal output on the output panel. The plate had 3 pieces of electronic switch chip and TC9273N-009 are powered by the +12V, which is a piece of damaged rubber powered off separately to monitor. After changing new damage to the manifold, the audio signal input/output Board back into the recovery, troubleshooting boot test.QKPservice manual download site