Electronic equipment repair and service manual search discussion :: Topic review - technics sa eh-790

Ovetomash · Posted: Fri Apr 03, 2020 11:46 pm Post subject:

Hello guys. I have eh560. After long time no use i start it and sound was really terrible. But after few hours sound became clear and fine. For the night it was switched off and in the morning i receive same story - bad sound and lately restore.
After opening i didn't found anything visual except overheated resistor r765 near to transistors, but after check it was found good.
What could it be? In what direction i should dig?

Justmanuals · Posted: Tue Mar 03, 2009 3:19 pm Post subject:

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Tumaini · Posted: Tue Mar 03, 2009 9:43 am Post subject: sa eh760

Hallo my technics stereo tuner amplifier model no.sa eh760 was blown off by a power generator. It picks the power but cannot turn on hence no display. Anyone to assist please!

Guest · Posted: Tue Mar 03, 2009 9:38 am Post subject: sa eh760

hi my technics stereo tuner amplifier was short circuited by a power generator and the fuse was blown off. after replacing the fuse the power gets into the amplifier but cannot turn on hence no display. please assist

polaret · Posted: Sat Nov 19, 2005 6:17 pm Post subject:

Hello my problem solved, i forget to check out main transformer there was the problem .About yours try to solder the front board main IC maybe bad contacs dry

rmkony · Posted: Sat Nov 19, 2005 6:33 am Post subject: SA-EH 560 Power Amp.

I have more or less similar to your system, it is SA-EH 560. It behaves like yours , once powered it prompt HELLO and goes to radio frequency 87.00mhz.After that nothing happens.Assist please.

Charlie · Posted: Fri Nov 18, 2005 5:43 pm Post subject: technics sa eh-790

Are you sure the output stage is OK?

Normally F61 is displayed where the clock should be, this is generally the fault of the output chip.

If the unit has a cooling fan, make sure it's working, these can give problems which cause it to go into standby.

Try soldering a 100nF capacitor across the supply to the fan, this sometimes helps with intermittent going into standby.

polaret · Posted: Thu Nov 10, 2005 7:08 pm Post subject: technics sa eh-790

Hello i have a technics sa eh790 and the problem is that when i try to power on the indicator led goes out rellai click to power on and then turns off again (led in std by on )output stage O.K.
Any info .

Thanks in advance