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Re: Troubleshooting a 250 model 1 Bass amp [message #27403 is a reply to message #27393]

Thu, 27 June 2019 23:50

chicagobill
Messages: 2006
Registered: April 2003

Senior Member

Some of those voltages are suspicious looking.

Before we get into changing chips, have you cleaned all of the connectors on the Molex plugs? Have you checked the pc pins for broken or cold solder joints? A bad ground connection on one of the boards could cause a floating voltage on one of the chips, so clean the connectors and see if that changes anything. I usually spray a little DeoxIt on the connector pins and plug in and then remove the connector a few times to burnish the contacts. On the 5066 board there is a three pin connector with a loop of wire that takes the place of the fuzz circuit bypass. Make sure that that plug is there and well connected.

I've also seen wires come out of the crimped connectors and make intermittent contact as well, so be sure to check that.

If all connectors are good, then changing chips would be the next step.

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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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