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Re: Troubleshooting a 250 model 1 Bass amp [message #27404 is a reply to message #27393]

Fri, 28 June 2019 20:28

Byteviolator
Messages: 13
Registered: June 2019

Junior Member

Ok I will check and clean the connectors. I have a fast drying electronic equipment cleaner that says it removes oxides. Should I just by a can of Deoxit

I've measured the voltage at R16 & R15 9.8V which seems to be expected. At R16 and R17 and pin 1 of Q3 I measure -.7V, the schematic indicates 7.1V (If I'm reading that correctly). Could the IC or the pots bring this voltage down? If R17 connects the transistor side to the IC side, could I isolate the transistors from the IC to verify Q3? Or is R17 and everything after it needed the test Q3 voltages?. Or would you forget about all that and change the chips?

1)Is there a replacement I can use for the IC?
2)Is an op-amp short causing -10.72V on pin 13 and -11.48V on pin1?
3)Have you seen two blown op-amp ICs in the same amp before?
4)Could an input have caused this?

Here are the voltages in a more readable format.
PC5066
1. -11.48V
2.
3.
4.
5.
6. .09V
7. -11.72V
8. -8.23V
9. -.33V
10.
11.
12.
13. -10.72V
14. 11.73V

PC5067
1. 3.08V
2.
3.
4.
5. 4.2mV
6. .22V
7. -11.66
8. -.69
9.
10.
11.
12.
13. -11.22
14. 11.66
Thanks again

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[Message index]

		Troubleshooting a 250 model 1 Bass amp By: Byteviolator on Mon, 24 June 2019 20:00
		Re: Troubleshooting a 250 model 1 Bass amp By: stevem on Tue, 25 June 2019 06:08
		Re: Troubleshooting a 250 model 1 Bass amp By: Byteviolator on Tue, 25 June 2019 17:04
		Re: Troubleshooting a 250 model 1 Bass amp By: Byteviolator on Tue, 25 June 2019 17:19
		Re: Troubleshooting a 250 model 1 Bass amp By: chicagobill on Wed, 26 June 2019 13:29
		Re: Troubleshooting a 250 model 1 Bass amp By: Byteviolator on Wed, 26 June 2019 16:04
		Re: Troubleshooting a 250 model 1 Bass amp By: Byteviolator on Wed, 26 June 2019 16:38
		Re: Troubleshooting a 250 model 1 Bass amp By: Byteviolator on Thu, 27 June 2019 07:37
		Re: Troubleshooting a 250 model 1 Bass amp By: chicagobill on Thu, 27 June 2019 15:47
		Re: Troubleshooting a 250 model 1 Bass amp By: Byteviolator on Thu, 27 June 2019 21:03
		Re: Troubleshooting a 250 model 1 Bass amp By: chicagobill on Thu, 27 June 2019 23:50
		Re: Troubleshooting a 250 model 1 Bass amp By: Byteviolator on Fri, 28 June 2019 20:28
		Re: Troubleshooting a 250 model 1 Bass amp By: chicagobill on Sat, 29 June 2019 00:15
		Re: Troubleshooting a 250 model 1 Bass amp By: Byteviolator on Mon, 01 July 2019 11:25
		Re: Troubleshooting a 250 model 1 Bass amp By: stevem on Mon, 01 July 2019 12:17
		Re: Troubleshooting a 250 model 1 Bass amp By: Byteviolator on Mon, 01 July 2019 15:29
		Re: Troubleshooting a 250 model 1 Bass amp By: chicagobill on Mon, 01 July 2019 13:17
		Re: Troubleshooting a 250 model 1 Bass amp By: stevem on Tue, 02 July 2019 06:11
		Re: Troubleshooting a 250 model 1 Bass amp By: Byteviolator on Tue, 02 July 2019 17:11
		Re: Troubleshooting a 250 model 1 Bass amp By: chicagobill on Tue, 02 July 2019 20:07
		Re: Troubleshooting a 250 model 1 Bass amp By: Byteviolator on Tue, 02 July 2019 22:07
		Re: Troubleshooting a 250 model 1 Bass amp By: stevem on Wed, 03 July 2019 05:38
		Re: Troubleshooting a 250 model 1 Bass amp By: Byteviolator on Thu, 04 July 2019 17:51
		Re: Troubleshooting a 250 model 1 Bass amp By: stevem on Fri, 05 July 2019 06:55

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