| Re: Troubleshooting a 250 model 1 Bass amp [message #27403 is a reply to message #27393] |
Thu, 27 June 2019 23:50   |
chicagobill
Messages: 2005
Registered: April 2003
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Senior Member |
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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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