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Old 6th November 2011, 11:22 PM   #31
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Normally the protection relay is to protect the speaker in case of one of the output transistors shorted or failed. This is because the speaker are connected directly to the output transistors. Suggestion power the amplifier and check the voltage before the speaker relay contact. If you read a neg/pos high voltage means that's ones of the output transistor it is leaking. If the voltage is high the relay will enable disconnecting the speakers. Sometime power transistors will check OKAY statically but when they are put under power they failed.
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Old 7th November 2011, 06:45 AM   #32
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there is an 1K resistor that goes open and if it does protection stays on for no other obvious reason .... been repairing this twice so far in RA 2000 but never though of writing down the part number ...

only i remember is that resistor is located on the rear area of the amp and if try to measure on board can confuse you

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