The Yamaha amplifier is the machine new leather art school, yuzhong district, when customers called to say the speaker sound hoarse, the amplifier is operating properly, require home maintenance.EmZservice manual download site
Arrived at the scene and try power machine, found the right channel only husky voice,EmZservice manual download site
EmZservice manual download site
Other channels are normal, the Husky channel connected to the left channel of commissioning, woofer tweeter doesn't work properly, open the loudspeaker voice coils are detected after already fused, presumably speaker short circuit damage the power amplifier amplifier, or amplifier transient output voltage is too high didn't had time to protect Horn and burnt. Measuring right out the midpoint voltage changes in 0.2 to 0.6 volts, other channel is 0.EmZservice manual download site
This Yamaha amplifier was sent back to the maintenance department,EmZservice manual download site
EmZservice manual download site
Apart machine cover Hou power measurement Hou level plus or minus powered normal, voice Husky description basic zoom components are also in work, according to experience like is has components metamorphic has, try with with hot hair dryer to zoom tube heating, about a minutes Hou display displayed. protect shut machine protection, seems is transistor out has problem, after repeatedly test, check problem in A1015 on tube at, replaced Hou try machine no Husky of phenomenon has, replaced Gao Yinyin circle Hou recovery normal.EmZservice manual download site
Yamaha maintenance activities include: AV amplifier repair, amplifier repair, washer repair, Blu-ray drive repair, speaker repair, CD machine maintenance.EmZservice manual download site