mannyo1221
New Member
Hi all
I know this is my first post on audiokarma, but thought I'll get stuck right in.
I am currently restoring a 1976 Toshiba music centre, model SM-3100. When I got this system it had issues with everything.
The turntable and tape deck are now working, so I am turning my attention to the tuner and amp, which seems more of a problem.
Tuner Observations.
LW= Working perfectly
MW= Working perfectly
FM Mono = Working perfectly
FM Stereo mode is where the problems are. When I press the FM Stereo selector button, I lose all audio from the right channel. There is something there if I turn the balance control all the way over, its just very, very quiet.
I've got the schematic for the tuner, and managed to get the pinout layout for the FM decoder IC, but I struggle with reading circuit diagrams and my only diagnostic tool at this point is a digital volt meter so I am not sure where to start.
is it ok on here, to upload the tuner schematic and the pin out for the decoder IC, perhaps another member may be able to advise me where to look.
The amplifier is working ok on all other inputs, and also the aux in on the back, it has minor difference in volume between left and right channels, but that is for another section.
The link below is to my youtube video of the actual system, you can see the controls on the front panel for the source selection.
I know this is my first post on audiokarma, but thought I'll get stuck right in.
I am currently restoring a 1976 Toshiba music centre, model SM-3100. When I got this system it had issues with everything.
The turntable and tape deck are now working, so I am turning my attention to the tuner and amp, which seems more of a problem.
Tuner Observations.
LW= Working perfectly
MW= Working perfectly
FM Mono = Working perfectly
FM Stereo mode is where the problems are. When I press the FM Stereo selector button, I lose all audio from the right channel. There is something there if I turn the balance control all the way over, its just very, very quiet.
I've got the schematic for the tuner, and managed to get the pinout layout for the FM decoder IC, but I struggle with reading circuit diagrams and my only diagnostic tool at this point is a digital volt meter so I am not sure where to start.
is it ok on here, to upload the tuner schematic and the pin out for the decoder IC, perhaps another member may be able to advise me where to look.
The amplifier is working ok on all other inputs, and also the aux in on the back, it has minor difference in volume between left and right channels, but that is for another section.
The link below is to my youtube video of the actual system, you can see the controls on the front panel for the source selection.
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