Author Topic: Yamaha RX-V373 PS PRT error  (Read 13156 times)

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Offline zwarder1

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Re: Yamaha RX-V373 PS PRT error
« Reply #50 on: April 22, 2021, 05:07:36 pm »
20 V DC on the actual speaker output FR when the STK is totally connected.
With STK ch3 disconnected the amp will work as normal.

Took out Q11 & tests fine I have also measured resistors & they all seem ok.


« Last Edit: April 22, 2021, 05:34:36 pm by zwarder1 »
 

Offline MajorbobTopic starter

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Re: Yamaha RX-V373 PS PRT error
« Reply #51 on: April 22, 2021, 05:59:59 pm »
Sounds like the STK is kicking out the 20V, confirm this by measuring CH3 when it is disconnected from the circuit (CH3 only).  If it is follow the voltage back through the amplifier and see where it's coming from.
 

Offline zwarder1

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Re: Yamaha RX-V373 PS PRT error
« Reply #52 on: April 22, 2021, 07:04:10 pm »
I think there was 2 volts across CH3 on the stk when it was disconnected from the rest of the circuit.
Not entirely sure, when compared to chassis ground they were around 53 to 54 volts.
Then it was closing time  |O
 

Offline MajorbobTopic starter

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Re: Yamaha RX-V373 PS PRT error
« Reply #53 on: April 22, 2021, 08:36:14 pm »
2V from CH3OUT to GND when it's not connected?  Should be 0V so you've likely got voltage on CH3IN from somewhere.  Possible that it's from the extra voltage on PRE but unlikely, the STK has quite a large input voltage range IIRC, and if it was the increased voltage I'd expect to see the fault on all channels.
 

Offline zwarder1

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Re: Yamaha RX-V373 PS PRT error
« Reply #54 on: April 29, 2021, 12:37:10 pm »
Finally got back to this today.
Yes I have 0.6v on ch3 input ( ch3in & Ch3NF )
I will have a hunt round this line

CH 1 & 2 measure 0v
 


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