Dear All,
I have a Pignose 7-100 guitar amp that has been out of operation for many years. In the past I had never really investigated the problem and just bought larger amps (not portable). Recently retired, I have more time on my hands to try and fix this thing. At this point I want to take the time to try to fix it and learn something new rather than just toss it.
I noticed corrosion in several battery terminals. I discarded the batteries and also saw one of the connectors was decrepit/cracked (from corrosion). Inspired by another post , I removed the old battery casing, snipped the red and black wires, and soldered in a new 9V battery connector and battery. The amp works but is weak and staticky. Previously i never had the power adaptor. So i bought one and tried that, and it is much louder like its supposed to be, a little noisy but I think that may be just a dirty POT.
With the power adaptor, I measured the voltage across the input and it was 9V as its supposed to be. Then with the adaptor disconnected and 9V battery in, i measured the voltage across the connecting wires (both at the solder points, as well as on the empty power cable input). It was ~9V when the guitar jack was not plugged in, but only 4-5V with the jack plugged in.
Could this be something on the board that recognizes when the jack is in and on battery (not adaptor) power? Or could it merely be the red wire from the battery side over to the other side (the red wire itself looks dark, not copper or silver like the others, but i don't know what its supposed to look like). I did notice that the conductance was the same for that wire and the black one.
If it is on the board, what component am I looking to test? I can't see anything obviously broken or burned out.
Thanks in advance for your help
Onyaw
I have a Pignose 7-100 guitar amp that has been out of operation for many years. In the past I had never really investigated the problem and just bought larger amps (not portable). Recently retired, I have more time on my hands to try and fix this thing. At this point I want to take the time to try to fix it and learn something new rather than just toss it.
I noticed corrosion in several battery terminals. I discarded the batteries and also saw one of the connectors was decrepit/cracked (from corrosion). Inspired by another post , I removed the old battery casing, snipped the red and black wires, and soldered in a new 9V battery connector and battery. The amp works but is weak and staticky. Previously i never had the power adaptor. So i bought one and tried that, and it is much louder like its supposed to be, a little noisy but I think that may be just a dirty POT.
With the power adaptor, I measured the voltage across the input and it was 9V as its supposed to be. Then with the adaptor disconnected and 9V battery in, i measured the voltage across the connecting wires (both at the solder points, as well as on the empty power cable input). It was ~9V when the guitar jack was not plugged in, but only 4-5V with the jack plugged in.
Could this be something on the board that recognizes when the jack is in and on battery (not adaptor) power? Or could it merely be the red wire from the battery side over to the other side (the red wire itself looks dark, not copper or silver like the others, but i don't know what its supposed to look like). I did notice that the conductance was the same for that wire and the black one.
If it is on the board, what component am I looking to test? I can't see anything obviously broken or burned out.
Thanks in advance for your help
Onyaw