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Marshall JCM2000 DSL 401 channel switching issue resolved.
How I fixed my MARSHALL JCM2000 DSL combo manual channel switching issue.
PROBLEM: Green LED and therefore "Clean Channel" not operating from front panel switches. (Although OK via foot-switch)
DIAGNOSES: All channels switched via foot-switch so I was doubtful that there was a component issue.
I zoned in on the foot-switch input jack at the rear of the amp.
SOLUTION: Looking at the foot-switch socket, there are 3 spring-metal "clamps" that open to allow contact with the foot-switch plug when it's inserted.
I found that the tip connector (the most innermost "clamp" ) was not springing back hard enough to create an electrical connection when the plug was removed.
So I inserted a plug all the way in, thus opening the tip "clamp" with the tip of the plug. I got a screwdriver and forced/bent the end of the metal clip downwards around the tip of the inserted plug.
Upon removal of the foot-switch plug, I immediately heard a "click" and the front green LED turned on. I then tested the 3 LEDs & channels with a guitar via manual and foot-switch operation.
Fixed!!! Hope this helps someone else.
PROBLEM: Green LED and therefore "Clean Channel" not operating from front panel switches. (Although OK via foot-switch)
DIAGNOSES: All channels switched via foot-switch so I was doubtful that there was a component issue.
I zoned in on the foot-switch input jack at the rear of the amp.
SOLUTION: Looking at the foot-switch socket, there are 3 spring-metal "clamps" that open to allow contact with the foot-switch plug when it's inserted.
I found that the tip connector (the most innermost "clamp" ) was not springing back hard enough to create an electrical connection when the plug was removed.
So I inserted a plug all the way in, thus opening the tip "clamp" with the tip of the plug. I got a screwdriver and forced/bent the end of the metal clip downwards around the tip of the inserted plug.
Upon removal of the foot-switch plug, I immediately heard a "click" and the front green LED turned on. I then tested the 3 LEDs & channels with a guitar via manual and foot-switch operation.
Fixed!!! Hope this helps someone else.
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