|
Introduction |
A 20 (?) year old Yamaha rxe100 amplifier with built -in tuner had an intermittent problem with both speakers turning off erratically. This gradually got worse with age, til it was only useable on the headphones. When the speakers turned on or off I could hear a click, which was the speaker relay closing or opening. (Not to be confused with quieter sound of the power relay which turns on almost instantaneously when the standby/on button is pressed) | | The fault was believed to be due to failure of the speaker protection circuitry. The work-around was to solder a wiretwo wires across the speaker relay pins having checkedthen checking that the dc offset inat the amplifierspeaker terminals was satisfactory (eg less than 50mV). If greater than about 600mV the speaker protection circuitry was doing its job and was not the fault and the soldered-in wires should be removed and different repair sought. |
|