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Ay6service manual download site
Ay6service manual download site
But try a few hours later left channel there is a murmur. After replacing a new source transfer switch fault completely ruled out. Since this is an early model, the layout is not very beautiful, Wired is more complex, if you want to remove the main power Board is in trouble, general maintenance if you are not familiar with connection is best not to split, since these lines are not marked.Ay6service manual download site
An early two-channel HIFI amplifiers Marantz, PM-70 and PM-80 can be said to represent models, has now done PM6003/7003/8004/7200 and other models, old machine quality, maintenance of small, got a lot of older fans still love here talk about a good friend of the PM-80AF.Ay6service manual download site
Failure is sometimes the power on the output relay does not snap, sometimes suction works but the volume increased protection, protective shutdown can take a long time after reboot. This machine uses protection chip is very classical TA7317P, is Japan Toshiba power amplifier protection integrated circuits, internal, including detection circuit, overload detection circuit, switch mode power supplies DC detection circuit, power on the midpoint squelch, or gates, Schmitt Triggers, regulator circuits, circuit, relay drive circuit circuit protection features great sound, reliable performance.Ay6service manual download site
Ay6service manual download site
The manifold blocks for the foot fault voltage is as follows:1:0.65V2:0V3:0V4:0V5:-0.7V6:23.4V7:0V8:135MV9:3.2V, this analysis, 8 pin voltage is abnormal, the circuit is protected, but the midpoint voltage and PIN voltage is measured is not the reason of protecting. Inadvertently using a pointer to the table at this time voltage measuring 1 foot, has found relay to pull-in (pointer table internal resistance is smaller, can lower potential of 1 foot), the PIN is caused by excessive voltage protection, what measure the voltage does not exceed 0.75 v of the said information? Find capacitor C863 leakage, 103 feet by a capacitor resistor is only 10K, replacement restored the full circuit, everything works fine.
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