JVC JR-S100 Hum...

[jeep jones]

Working on a JVC JR-S100. It plays and sounds great. However, it has an audible hum on all inputs. Replaced the filter caps, no change. Also makes a pretty good pop when turning on.

No occilloscope, just a mm. Where should I start looking? Full recap of the power board? Transistors?

Any info would be appreciated!

 

[cademan]

Hum is usually associated with the DC power supply so if you haven't changed out the capacitors there, it's probably due.

 

[jeep jones]

Hum is usually associated with the DC power supply so if you haven't changed out the capacitors there, it's probably due.

Ok, on to Mouser. Thanks!

 

[redk9258]

Replaced the filter caps

???

 

[redk9258]

I would check all ground connections. All screws holing PCBs down, etc.. Note you may pick up noise / hum with the cover removed.