warriorfan
Well-Known Member
Eatly fathers day gift came in the form of a 1978 sansui 7070. Work on the golf course has me just swamped so I no longer have time to troll the classifieds for dealspretty good deal on this unit as it was known to have dropped a channel 30 years ago. The owner put it up in the closet. So...Very minty but a bad channel. No haggle over the price needless to say.
Just kind of fiddling until I have some time to actually measure bias and offset. It has got one good.cleaning with deoxit. Most all lights work upon hitting the power button and the relay does click after 5 seconds or so. Hooked a test speaker up to find I actually have no sound from any channel. I tried only aux, am, and fm as sources. Meters for fm signal all function. I did a pretty thorough check for burnt wires, resistors, and bulging or leaky caps. No bad solder joints or cracked boards in this going over either. Could have missed something but it will show when I really dig in. Everything is very clean inside btw. I did notice a few things. I was noticing that the left and right side of the tuner dial indicator does not light up. A gentle tap gets the left side, but the right side will not come on unless I push lightly up on the connection for the lights where they plug into the board. When a do this I also hear a slight click sound that I will ha e to check once again but swore it was the relay. Wondering if the relay is not closing all the way? Hope I can get back to it this afternoon sometime. I was hoping maybe someone would chime in and.maybe this is a simple fix. Optimistic yet but surely those fused resistors are going to have me doing some work? Nice to see this has been covered at length here and this.looks like it will actually be a easy unit to work on. Kind of excited to see how this will compare to my au555a. Thoughts? Thx fellas!
Just kind of fiddling until I have some time to actually measure bias and offset. It has got one good.cleaning with deoxit. Most all lights work upon hitting the power button and the relay does click after 5 seconds or so. Hooked a test speaker up to find I actually have no sound from any channel. I tried only aux, am, and fm as sources. Meters for fm signal all function. I did a pretty thorough check for burnt wires, resistors, and bulging or leaky caps. No bad solder joints or cracked boards in this going over either. Could have missed something but it will show when I really dig in. Everything is very clean inside btw. I did notice a few things. I was noticing that the left and right side of the tuner dial indicator does not light up. A gentle tap gets the left side, but the right side will not come on unless I push lightly up on the connection for the lights where they plug into the board. When a do this I also hear a slight click sound that I will ha e to check once again but swore it was the relay. Wondering if the relay is not closing all the way? Hope I can get back to it this afternoon sometime. I was hoping maybe someone would chime in and.maybe this is a simple fix. Optimistic yet but surely those fused resistors are going to have me doing some work? Nice to see this has been covered at length here and this.looks like it will actually be a easy unit to work on. Kind of excited to see how this will compare to my au555a. Thoughts? Thx fellas!