Red led on Mark 4B : Malfonction or not ?

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domglop78

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Joined
Dec 7, 2014
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Hello
I have a Mark 4B and recently The red LED on the front AV just above the output / level button is weakening. it lights up then from time to time it goes out slowly until almost no more light. if I tap on it it turns on again .... does this come from the diode or from the opto-coupler?
malfonction or not ?
anyone have a schematic with each opto-coupler and the emplacement in PCB with the fonction...

Thank you for your reply and take care of you
dom
 
Those leads were crimped, super common failure mode. When they go in for service you have have them soldered.
 
Hello
Thank you for your reply
I am trying to understand ... the diode side connections are crimped? or then PCB side?
i think they is a solder on PCB... same for diode ? no ?
thx a lot...
 
Mine has the same problem. i just tap it and it comes back on. It's not a big deal.
 
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