I have a technics su g91 amplifier and speakers a and b will not work and i believe that it has to do something with the "over load" icon being lit up. I was wondering what that specific icon represented and what i can do to fix it?
I had the same problem. As soon as the volume reached about 24db it would go into overload. I was able to fix it by soldering all the connections on the larger power module. The one connected the the heat sink. When I took it apart there where several solder points that had come loose.
I have a technics GX 650 model. 3 years ago i put it inside my cabinet for the same reason that whenever i turned it on it stays in overload conditon. so this morning March 5, 2012 i try to dissamble the whole unit and cleaned it form dust by using paint brush and electric fan. i found the solution by just cleaning the unit fan circuitry its copper foil contacts and it works again. this unit is 19 years old already and back into its old form. so the only the circuit in the fan had a problem i thought it was the power ic.
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I assume you want to use the SU-G91 as a power amplifier to drive your speakers. If your receiver has connections for inserting an equalizer (may be labeled pre-amp output and power amp input), remove the jumpers between the pre-amp and the power amp, then run cables from the pre-amp to the SU-G91 inputs. You can have an equalizer between the receiver and the integrated amplifier. If this is not available, use the recording output (for a tape recorder on older receivers). Note that the volume control on the receiver will be bypassed with this connection.
THe amp has detected a problem and shutdown to prevent further damage. This unit has 2 amp pacs inside and one or both have failed. If you can solder, you can fix this yourself. The main amp pac is an SVI3206 and can be purchased online for about $60.