ARCHIVED FORUM -- March 2012 to February 2022READ ONLY FORUM
This is the second Archived Forum which was active between 1st March 2012 and 23rd February 2022
Dear Friends.
My Beogram 3404 spins very fast like 78 rpm or much more.
The electronic speed control (servo) has problem somewhere in the PCB. the motor get the maximum voltage all the time.
I don't know if it's bad capacitor or IC or something else. I pulled out the motor and plugged it
on my other Beogram 3404 (I have 2) . on the other turntable the motor working flawlessly is it should.
So, the motor is not the problem.
The speed buttons are not responsive.I have some knowledge in basic electronics
but I do not want to take risk and would like to get information if somebody here had experienced
in this repair. (the belt is new and set properly in the motor pulley)
Many thanks.
Most common is a wrong or worn down belt.If the belt is slipping, the motor will accellerate to easily and the electronics will allow it to sync on double speed.
Other possibilities:Cracked solder joints on the controller PCBOxidated speed setting trimmers (remember there are three)Some other electronic fault
Martin
Dear Martin.
Many thanks for your answer.
As i said before, The problem is the electronic control and the belt is new.
For ow yet all the other thing you mentioned found without problem.
I started to dive into the PCB. I had replaced capacitors. Now I'm checking all the resistors and transistors.
From there I will proceed to the IC.
I'm hopping to find the bad component and save this turntable.
Thank you.