UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - AKAI GXC-46D Cassette recorder/player

monaro0162 · 17th Nov 2017, 1:33 pm

Hello,

I have one of these machines, it is in very good condition and plays cassettes very well, but has one issue: A 50hz mains hum (lowish level) can be heard in the right channel when the motor is engaged, the left channel is fine. When the motor is disengaged the hum disappears. I'm assuming that the motor is loading the power supply which in turn is causing the hum, may be there is a cap going or the psu voltage is low? Could anybody advise where the power supply rail (or rails) can be probed with a scope so as I can see what is going on?

17th Nov 2017, 1:33 pm	#1
monaro0162 Pentode Join Date: Sep 2016 Location: Stansted, Essex, UK. Posts: 185	AKAI GXC-46D Cassette recorder/player Hello, I have one of these machines, it is in very good condition and plays cassettes very well, but has one issue: A 50hz mains hum (lowish level) can be heard in the right channel when the motor is engaged, the left channel is fine. When the motor is disengaged the hum disappears. I'm assuming that the motor is loading the power supply which in turn is causing the hum, may be there is a cap going or the psu voltage is low? Could anybody advise where the power supply rail (or rails) can be probed with a scope so as I can see what is going on?