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Re: need to test K250-1 [message #28390 is a reply to message #28376]

Sat, 20 November 2021 06:15

stevem
Messages: 4756
Registered: June 2004
Location: NY

Senior Member

Ok, the first thing your going to need is to get a hand held tube type solder sucker since your going to need such to get some Transistors and maybe resistors off of the output driver board ( PC 5065 ) on the floor of the amp.

Since you have a meter, set it to ohms .
On the driver board you will see 4 big 5 watt box type ciramic resistors next to each of the 4 output driver Transistors in there heat sinks.
These are very low ohms and should not check open, and many times when the output section has a problem like your amp one or more of these resistors ( called emitter resistors) will over heat and go open.

On the schematic you found in your amp these four are resistors r 23, r25, r33 and r35.

Please report back on your findings and we will move on.

[Updated on: Sat, 20 November 2021 06:17]

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[Message index]

		need to test K250-1 By: coatikid on Fri, 05 November 2021 04:42
		Re: need to test K250-1 By: stevem on Fri, 05 November 2021 06:09
		Re: need to test K250-1 By: coatikid on Sat, 06 November 2021 15:38
		Re: need to test K250-1 By: stevem on Sat, 06 November 2021 17:59
		Re: need to test K250-1 By: coatikid on Fri, 19 November 2021 01:31
		Re: need to test K250-1 By: coatikid on Mon, 22 November 2021 20:17
		Re: need to test K250-1 By: stevem on Sat, 20 November 2021 06:15
		Re: need to test K250-1 By: stevem on Sat, 20 November 2021 06:25
		Re: need to test K250-1 By: stevem on Sat, 20 November 2021 06:28
		Re: need to test K250-1 By: stevem on Wed, 24 November 2021 12:31

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