Hi starting the restoration of my Pioneer SA-510. After some first checks I hooked speakers and source equipment to this amplifier.
Step 1 - Thorens TD-160: after connecting this turntable, I first tried to play a record. It all went well, in fact it sounded quite good. After playing one side of a LP, I flipped it to play the other side. And as soon as I touched the headshell of the Thorens I noticed a hum/buzz. Also when I touched the tonearm, this happened.
When I dropped the needle, I noticed that there was hardly any sound coming out of the speaker.
FYI; the Thorens TD-160 is not grounded in this setup.
Step 2 - Checks on volume potentiometer: Since this is a vintage product, dirt can be anywhere. So I checked if the potentiometer had dirt causing the volume drop. When turning it up and down I felt it was not as smooth as it can be. But I also tested the volume before it dropped and than the volume knob was working good enough. So I expect the cause of volume drop is not the volume potentiometer.
Step 3 - Check different audio input: Next I connected an iPhone to the aux input. Here I had the same effect; hardly any volume coming from the speakers.
Consideration - I have not yet opened up the amplifiers casing. Though I expect it will be quite dusty inside.
Question - Does anyone recognize this situation?
Step 1 - Thorens TD-160: after connecting this turntable, I first tried to play a record. It all went well, in fact it sounded quite good. After playing one side of a LP, I flipped it to play the other side. And as soon as I touched the headshell of the Thorens I noticed a hum/buzz. Also when I touched the tonearm, this happened.
When I dropped the needle, I noticed that there was hardly any sound coming out of the speaker.
FYI; the Thorens TD-160 is not grounded in this setup.
Step 2 - Checks on volume potentiometer: Since this is a vintage product, dirt can be anywhere. So I checked if the potentiometer had dirt causing the volume drop. When turning it up and down I felt it was not as smooth as it can be. But I also tested the volume before it dropped and than the volume knob was working good enough. So I expect the cause of volume drop is not the volume potentiometer.
Step 3 - Check different audio input: Next I connected an iPhone to the aux input. Here I had the same effect; hardly any volume coming from the speakers.
Consideration - I have not yet opened up the amplifiers casing. Though I expect it will be quite dusty inside.
Question - Does anyone recognize this situation?
I think we may all have been there at some time or another!
Is this the first time you have fired up the amplifier since buying it recently?
The obvious thing to do is open up the case and look for any signs of component distress.
A service manual can be downloaded, but may or may not be of assistance depending on your level of troubleshooting experience.
