Could be noisy motor controller. Been a very long time but isn't the capstan spinning selected speed whether the pinch roller is engaged or not? So if the clock or whatever circuit controls speed has a fault causing it to generate this noise it would do it whenever its running, whether tape is moving or not. Just my guess. Open it up, hope its something easy like cleaning dirty connections. It is a vintage deck after all. Nice one though. Wish I'd never sold my Pioneer RTR.
Pioneer RT701 noise in rt channel on low speed only!
So this one has me stumped.
My Pioneer RT701 just this afternoon started making very odd noises through the rt channel, sort of a sound VERY similar to when you clean your stylus with a brush and your input is on for the phono. It is very irregular, it can go a couple minutes quiet, then a few seconds in varying intensity before quiet again.
Now as I found by accident this is ONLY on 3.74ips. When I push the button to engage high speed 7.5ips it goes deathly silent as it always has been.
Even stranger it makes the noise on 3.75 even with no tape playing, just sitting powered on.
You can see the vu meter move when the noise occurs.
How in the world can this NOT happen when I switch to 7.5ips?
Surely that should ONLY change the speed of the Capstan?
I took the cover off, checked all connections, blasted any pots I could see with deoxit but no change.
Anybody have any ideas?
My Pioneer RT701 just this afternoon started making very odd noises through the rt channel, sort of a sound VERY similar to when you clean your stylus with a brush and your input is on for the phono. It is very irregular, it can go a couple minutes quiet, then a few seconds in varying intensity before quiet again.
Now as I found by accident this is ONLY on 3.74ips. When I push the button to engage high speed 7.5ips it goes deathly silent as it always has been.
Even stranger it makes the noise on 3.75 even with no tape playing, just sitting powered on.
You can see the vu meter move when the noise occurs.
How in the world can this NOT happen when I switch to 7.5ips?
Surely that should ONLY change the speed of the Capstan?
I took the cover off, checked all connections, blasted any pots I could see with deoxit but no change.
Anybody have any ideas?
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