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TOA 903A Lack of volume when unit is powered on. After master volume is rapidly twisted from 0 to 100%, speakers krackel and music slowly comes back to an acceptable level. Have sprayed a contact cleaner in master volume rheostat (knob), this has helped a little, but the unit is still unreliable.

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If the volume control does not appear to be defective, I would next check the speaker relay. If the contacts there are corroded, the symptoms will be as you describe. The higher voluime level will allow the initial "connection" to occur with the unit working almost normally after that. Replace the relay with a new one. You should be able to get one from TOA.


Posted on Nov 16, 2009


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In some cases, the STANDBY indicator may blink slowly, twice per second. In this case, turn off the unit, unplug the power cord, and check the following points.

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When using the unit in a rack or other enclosed space, heat may build up inside the unit and cause a fire. When installing the unit, be sure to leave suffi cient space between the top, back and both sides of the unit and walls or other AV components to prevent the internal temperature from rising.

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