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You may have a speaker connected that the amplifier cannot drive. Your receiver is compatible with speakers with 6-8ohm rating, however, even though your speakers may be operating within that range they may also have low sensitivity.
With the receiver turned off, disconnect the power cord for a few minutes, reconnect and then power it back on. And while you're behind the unit, that would be the convenient moment to inspect your speaker terminals...check for cracks, evidence of arcing and any stray pieces of strand wire that can touch the chassis or other terminals. If any of those conditions exist then that can a root cause of the problem and will have to be repaired.
You must also ensure that all of the chassis vents are not blocked and the unit does not have another device on top of it that also generates heat as well. In any event, keep it cool.
After that, enter into your speaker setup menu and adjust your crossover to a higher point for whichever speaker you had the failure. This will help control the overload condition, if in fact, it is being caused by your amplifier ability to drive your current speakers.
If after all of the above is performed and the condition still exists, try speakers with compatible ohm rating but higher sensitivity.
The fuse is a part of the problem it is for safety measures
the problem is in between the power supply regulators, capacitors and power amplifier circuit board.
usually a regulator or an output transistor can cause this error.
hope this helps.
check speaker connections.sounds like the system is trying to stop some thing more serious happening by shutting itself down.a pain yes but saves blowing something up.if no luck,then definately send in for repair
According to Technics reference manual, turn the unit off, unplug for a few, plug in, turn unit on. Consult your "dealer"(authorized repair person, i guess) if light remains on. But doesn't say what f70 means, or associated with. Unplug and open up the unit, and check the internal fuses on the circuit board. Also check for proper speaker wire hook up. Re-seat the connections. Visibly check the speaker wire runs for shorts, cracked casing, cat/dog chewing. etc.
EXAMINE VENTS ON UNIT FOR SIGNS OF LINT/DUST/ANIMAL HAIRS; EVEN IF NONE FOUND, IF YOU CAN BLOW OUT THE UNIT WITH COMPRESSED AIR (CAREFULLY) THAT COULD HELP. MAKE SURE THERE IS OPPORTUNITY FOR AIR CIRCULATION AROUND WHERE THE UNIT IS INSTALLED.
ALSO, MAKE SURE NO FRAYED SPEAKER WIRES OR ANY OPPORTUNITY THAT SOME ARE SHORTED. PUT YOUR EAR CLOSE TO EACH SPEAKER TO VERIFY THAT SOUND IS COMING OUT AND THAT IT'S NORMAL.
IF THE WIRES ARE OK BUT THERE IS ANY SPEAKER WITH A BUZZ OR ODD SOUNDS OR DISTORTION IT'S PROBABLY A FINAL AMP STAGE IN THE UNIT; THAT SPELLS REPAIR.
YOU CAN ALSO PUT AN OHMETER ON THE SPEAKERS IF YOU HAVE ONE; THEY ALL SHOULD BE ABOUT THE SAME, BUT TYPICALLY WITH A RANGE OF ABOUT 3-16 OHMS EACH.
IF YOU CONNECT ANY SMALL BATTERY, SUCH AS A DOUBLE A, TO THE SPEAKER WIRES AFTER DISCONNECTING FROM THE UNIT YOU SHOULD HEAR POPPING SOUNDS IN THEM. IF YOU DON'T, THE SPEAKER OR THE WIRE TO IT IS DEFECTIVE.
IF ALL THIS FAILS, YOU MAY BE LOOKING AT A LIVE TECH BENCH JOB