Good day everyone,
I have a Dayton SPA 250 here with the known faults.
After replacing various electronic capacitors, the amplifier worked again.
The browned glue, which is conductive, is also removed.
Especially the glue on the plug-in PCB (soft limiter).
The auto switch has three positions which are not entirely clear to me.
In auto, the speaker turns on and stays on, while it should turn off after 10 to 15 minutes.
The other two positions do nothing, only off and the speaker does not turn on in the on position.
There is no diagram of the standby power supply
Who knows what could be wrong?
Greeting,
Adrie Neyenhuys
I have a Dayton SPA 250 here with the known faults.
After replacing various electronic capacitors, the amplifier worked again.
The browned glue, which is conductive, is also removed.
Especially the glue on the plug-in PCB (soft limiter).
The auto switch has three positions which are not entirely clear to me.
In auto, the speaker turns on and stays on, while it should turn off after 10 to 15 minutes.
The other two positions do nothing, only off and the speaker does not turn on in the on position.
There is no diagram of the standby power supply
Who knows what could be wrong?
Greeting,
Adrie Neyenhuys
Sorry for the long delay. I have had multiple problems with these amplifiers. The SPA250 STBY board has a small SMPS that outputs 12Vdc to the preamp, where the actual audio signal sensing is done. If the 3-way switch is in the middle "AUTO" position and a signal is present, the 12Vdc is routed back to the STBY board. This closes the power relay to apply power to the main power supply. Known (reported problems) include C8 470uF, 16 Vdc and the the switch itself. Good Luck- EVMan
