The customer had a Yamaha RBX375 bass, which has active circuitry. The pickup pan control and tone control didn't appear to be working properly. Active circuits can be tricky to work with as there are usually quite a few components, circuit boards and wires crammed into small spaces in the control cavities. The complexity of the circuits also makes them quite difficult to understand and diagnose without a circuit design diagram. Fortunately with this one I was able to find a service manual on the Internet, for a similar Yamaha bass. This helped me to home in on the part of the circuit which might be at fault. By doing some meter tests and physically inspecting the circuit (with a torch and magnifying glass) I found a solder joint which had been badly made in the factory and which had subsequently come apart. This was easily fixed, but is a good example of how this type of problem can take a lot more time to diagnose than to fix.
0 Comments
Your comment will be posted after it is approved.
Leave a Reply. |
Archives
February 2021
Categories
All
|