Panasonic sa he 75 f70 error - Panasonic SA-HE70 Receiver

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.

The F70 error is a code for "protect". See the link below for a general explanation of protect mode. Specifically for your unit, the output amplifier IC has failed. This can be replaced, but the parts cost will be in the $100 range. Please update this if you have further questions.

Thanks,
Dan

Link: http://www.fixya.com/support/r5390728-protector_means

a error F70 in my panasonic sa-he7

rafatecnico amigo mio el error esta en la placa de coneccion de dispositivos auxiliares por favor revisa soldaduras de los dos transistores de potencia que se encuentran juntos y de los dos transistores de acople de los de potencia, si se encuentran bien entonces alguno de ellos esta averiado en cortocircuito o abierto

replace resistor 1702 4.7Ohm

Look up "Panasonic F70 error" on Google and you will find plenty of discussion about this problem.

The F70 is a blown fuse error. It looks like you can can the fuse yourself, if so inclined, otherwise send it to a service agent.

According to the operating instructions, you must take it to a repair facility. There are no troubleshooting suggestions for this problem in the manual.

F70 interrmintent problem caused by (Ic-current) interupted, supply for cpu, Q1702 (emitter point) high resistant to IC1701, suggestion- connect a wire between these component due to pcb track poor contact.