Post by sumilumi on Jan 5, 2022 8:37:45 GMT -5
Hi fellow troubleshooters.
I’m new to repairs with many knowledge gaps. Hoping someone here may point me to a relevant tutorial or maybe help me understand the circuit and what may be the cause of the fault.
I have on my bench a linear rectifier board from an AKAI digital sampler from the early 90’s. It has two PSU’s. An smps to drive its digital board, drives displays etc. Also a separate discreet Linear supply for it’s DAC and analogue output stage board.
Problem is very high ripple (700+mV) on the linear DC converted but unregulated output.
The DAC / Analogue board regulator does a good job reducing this 700mV down to about 35mV but that’s still much too high for a sensitive DAC board.
I’m guessing this is a tired capacitor problem. I will be replacing all the electrolytics but i’d like to learn more about psu trouble shooting. Based on the pictures would you say it’s a capacitor issue or could this be faulty silicone.
Thanks in advance.
I’m new to repairs with many knowledge gaps. Hoping someone here may point me to a relevant tutorial or maybe help me understand the circuit and what may be the cause of the fault.
I have on my bench a linear rectifier board from an AKAI digital sampler from the early 90’s. It has two PSU’s. An smps to drive its digital board, drives displays etc. Also a separate discreet Linear supply for it’s DAC and analogue output stage board.
Problem is very high ripple (700+mV) on the linear DC converted but unregulated output.
The DAC / Analogue board regulator does a good job reducing this 700mV down to about 35mV but that’s still much too high for a sensitive DAC board.
I’m guessing this is a tired capacitor problem. I will be replacing all the electrolytics but i’d like to learn more about psu trouble shooting. Based on the pictures would you say it’s a capacitor issue or could this be faulty silicone.
Thanks in advance.
