Comments: this machine looks more atmospheric, the structure is a bit like mark layout or maijingtu, workmanship and quality can't compete with imported machines, of course, but value for money may be the consumers heart problems, and mark and maijingtu machines is not only no domestic manufacturer,J8hservice manual download site
J8hservice manual download site
No after sale maintenance services, so stereo amplifier maintenance factors consumers should also be considered.J8hservice manual download site
Symptom: after display, can automatically detect the signal source, and then play the sound correctly, less than a minute the sound gradually become smaller, joint shutdown, reboot and repeat the above process.J8hservice manual download site
J8hservice manual download site
Maintenance process: landscape do with of this sets Chinese control system also is compared advanced of, not only various of spectrum displayed, Japan amplifier Shang of protection function Basic are has, important of is Chinese displayed meet Chinese of taste, Japan amplifier full is English operation, user even a remote control are not too whole of understand, more alone senior set has, after all people in the understand English of people too less too less. Teardown was observed where there is no burning, no obvious appearance of the damaged places, measurement of ultimate power tube no problemJ8hservice manual download site
J8hservice manual download site
The voltage of the power point, 5 volt and 12 volt positive and negative voltage normal, zoom level plus or minus 45 Volt supply is normal, when the amp sound reducing voltage gradually disappear, but after the protection caused by the shutdown voltage will disappear, this is not normal? Switch repeatedly observed power amplifier enters protection didn't hear the sound of main relay release, General relay either suction or release will be "click" sound shows are not real protection, voltage problems disappear, level after level of measurement forward from a filter capacitor,J8hservice manual download site
J8hservice manual download site
Where the disappearance of the main relay, measuring transformer input voltage is found, after booting the AC voltage from 230 volts all the way down to 90 volts, it is clear that this is caused by bad contact of the relay, after changing relay failure to eliminate.

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