Hi there ! I'm a customer from Belgium, have been using Technics SA DX850 for like 10 years now and never had any problems till now ... What has been happening in the last two weeks is that the amp suddenly notify a "F70" error on the screen, and all sound stops (except the same "clic" you can year when you turn the amp on).
Then, whatever button I try to turn or push, it only says "Switch Off Power" ...
This F70 error may arrive every two minutes or two hours, unpredictable. I've been checking the air supply, first thought there would not be enough ventilation due to dust, but it all seems ok ...
Could you please help me ? ' can't find this particlualr error reported on the web ... If so, many thanks !!!
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There should be removable access panels under the amplifier IC's that are attached to the heatsink. Remove these panels and inspect the solder connections on the IC's and the voltage regulators that should be mounted next to them. These have always had a tendency to go bad on Technics receivers. If you resolder all of these, you should clear up your problem.
The F70 error certainly indicates a blown fuse inside. The real problem is why the fuse is blown: there are only two possible reasons 1. there is a short circuit on the output (lines or speakers) 2. you have a blown output transistor (and that means some work and skills to replace).
To be sure, please change the fuse with a same rated fuse (buy more than one because it can blow again). Disconnect the speakers and turn the amp on. If the fuse blows again, it is sure something wrong with the output transistors. If the fuse remains ok, then please check all the wiring to the speakers.
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.