@schniefelix it did get a little later than expected. Anyhow, for now and this is not yet an answer, here is the partial service manual for this model which includes all the schematics. We can only be on the same page if we got the same book :-) The board where the speaker connections and the relays are is the Sp TM board and we’ll have to work our way up from there through CN501 and CN502 [document|26276]
Looks like one of the relays controls power to the ,main board and the other provides speaker protection. So when you turn your Amp on you should actually here a “click click” when both relays get energized. Since you have lights etc. I would expect at least one click. Let us know what you hear or “feel on those relays.
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IC401 on the main board is a UPC1237 Amplifier Protection IC which we can check the voltages on according to the schematic. Pin 7 on this should have 2.2V to open the relay for the speaker circuit.
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IC401 on the main board is a UPC1237 Amplifier Protection IC which we can check the voltages on according to the schematic. Pin 7 on this should have 2.2V to close the relay for the speaker circuit.
If you do not yet have a multimeter and have not tested live circuits you want to let us know so we can provide a bit more guidance on that. Potential touching a component/circuit while it is “hot” could be a shocking experience :-) So no rush and we shall get there eventually.
@schniefelix it did get a little later than expected. Anyhow, for now and this is not yet an answer, here is the partial service manual for this model which includes all the schematics. We can only be on the same page if we got the same book :-) The board where the speaker connections and the relays are is the Sp TM board and we’ll have to work our way up from there through CN501 and CN502 [document|26276]
Looks like one of the relays controls power to the ,main board and the other provides speaker protection. So when you turn your Amp on you should actually here a “click click” when both relays get energized. Since you have lights etc. I would expect at least one click. Let us know what you hear or “feel on those relays.
-
IC401 on the main board is a UPC1237 Amplifier Protection IC which we can check the voltages on according to the schematic. If you do not yet have a multimeter and have not tested live circuits you want to let us know so we can provide a bit more guidance on that. Potential touching a component/circuit while it is “hot” could be a shocking experience :-) So no rush and we shall get there eventually.
+
IC401 on the main board is a UPC1237 Amplifier Protection IC which we can check the voltages on according to the schematic. Pin 7 on this should have 2.2V to open the relay for the speaker circuit.
+
+
If you do not yet have a multimeter and have not tested live circuits you want to let us know so we can provide a bit more guidance on that. Potential touching a component/circuit while it is “hot” could be a shocking experience :-) So no rush and we shall get there eventually.
@schniefelix it did get a little later than expected. Anyhow, for now and this is not yet an answer, here is the partial service manual for this model which includes all the schematics. We can only be on the same page if we got the same book :-) The board where the speaker connections and the relays are is the Sp TM board and we’ll have to work our way up from there through CN501 and CN502 [document|26276]
Looks like one of the relays controls power to the ,main board and the other provides speaker protection. So when you turn your Amp on you should actually here a “click click” when both relays get energized. Since you have lights etc. I would expect at least one click. Let us know what you hear or “feel on those relays.
+
+
IC401 on the main board is a UPC1237 Amplifier Protection IC which we can check the voltages on according to the schematic. If you do not yet have a multimeter and have not tested live circuits you want to let us know so we can provide a bit more guidance on that. Potential touching a component/circuit while it is “hot” could be a shocking experience :-) So no rush and we shall get there eventually.
@schniefelix it did get a little later than expected. Anyhow, for now and this is not yet an answer, here is the partial service manual for this model which includes all the schematics. We can only be on the same page if we got the same book :-) The board where the speaker connections and the relays are is the Sp TM board and we’ll have to work our way up from there through CN501 and CN502 [document|26276]
+
+
Looks like one of the relays controls power to the ,main board and the other provides speaker protection. So when you turn your Amp on you should actually here a “click click” when both relays get energized. Since you have lights etc. I would expect at least one click. Let us know what you hear or “feel on those relays.
@schniefelix it did get a little later than expected. Anyhow, for now and this is not yet an answer, here is the partial service manual for this model which includes all the schematics. We can only be on the same page if we got the same book :-) The board where the speaker connections and the relays are is the Sp TM board and we’ll have to work our way up from there through CN501 and CN502 [document|26276]