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idle current adjustment

indomitus

indomitus

Member
I try to adjust the idle current on my Marantz 2500 on the right channel my voltmeter shows around 0, but when i try to adjust on the trimming resistor (R716/R761) its not possible to adjust anything, it keep staying on around 0 on my voltmeter.
On the leftside there is no problems, and the trimming resistor is in fully working condition.
Any ideas where to scearch after the problem?
 
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One possibility-Your test points on the right side are not connected electrically to the output transistors emitters/emitter resistors.Does the right channel work properly? Are the right channls heatsink getting warm/hot?
 
Yes the right channel is fully working, and the volume is equal in both speakers.
I will try to find out if the heat sink is getting warm
 
Quite often when you see this condition it is either the heat sensing transistor that has gone open, or one of the other transistors in that chain.
 
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