Mark IV led problem

Pre Recto days. Boogie modified Fenders, Mark I-IV, Dual Calibers, etc

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SgtPatton
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Mark IV led problem

Post by SgtPatton » Sun Jan 25, 2009 5:08 pm

I have a little problem with my Mark IV's channel ledlights. I use my TC G-major's relay switches to change channels in amp. The problem is, that when I change to Lead channel, the led shines bright for a moment. After couple of seconds it turns darker. I hear some slight change in sound too. However, I doubt that the problem is tubes, 'cause they are quite new. Has anyone had this problem before? The amp is from the mid 90's.
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kiff
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Re: Mark IV led problem

Post by kiff » Sun Jan 25, 2009 6:18 pm

has it always happened using the g-major, and does it happen with the stock foot-switch?
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Blueracer
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Re: Mark IV led problem

Post by Blueracer » Sun Jan 25, 2009 7:46 pm

In addition to trying the footswitch use the mode selector switch in the back of the amp to select the lead channel. If the condition persists the issue is most likely in the Mark IV. If it does not the issue is most likely in the G-major.

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Shep
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Re: Mark IV led problem

Post by Shep » Sun Jan 25, 2009 9:30 pm

yeah, you have a older mk IV. mine does it and nearly everyone Else's does too. its the led them selves.just give them alittle push and they should go bright again. no problems
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fpoon
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Re: Mark IV led problem

Post by fpoon » Sun Jan 25, 2009 9:37 pm

Yup, it's normal and happens to all Mark IV's. Touch it with your finger and it'll shine like it's brand new. The slight change in sound is most likely occuring from the G-Major being plugged into the loop.
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SgtPatton
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Re: Mark IV led problem

Post by SgtPatton » Mon Jan 26, 2009 5:36 am

Yeah, I pushed the leds and that solved the problem. Thanks for advice!
Mesa Boogie Mark IV (A) Medium Head
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