When I move the turntable arm towards the platter, the Akai AP206C turntable does a slight move then stops and does not move anymore. But when I give the platter a slight turn clockwise , the slight momentum helps it to spin normally and I am able to play my records all the way through. I have downloaded the servicing manual from Vinyl engine. l have some basic electronic knowledge. I need help to fix the issue.
Tks for yr reply. Indeed I went practically through all youtube videos. They did help me in fixing othet issues such as ratic strobe speed on 33/45 turns, The only VRs I have adjusted are the VR2/3/4/5 for the above pblm,but I can' t find one video dealing specifically with the motor issue. I did not touch VR1 due no oscilloscope nor VR6 as I do not know the risk. Any further help please. p.s I do not have a dual channel Ac voltmeter for sdjusting VR6.
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The VR6 adjustment looks a bit challenging as it’s expecting an analog voltmeter… you could do it on a two-channel oscilloscope though.
VR1 will absolutely need a scope, and I suspect that’s the starting torque problem.
Did you clean and lubricate the main platter bearing? That will also be important.
VR1 will absolutely need a scope, and I suspect that’s the starting torque problem.
Did you clean and lubricate the main platter bearing? That will also be important.
I had already cleaned and lubricated the main bearing and all moving parts and also sprayed all VRs with contact cleaner. In the meantime I have tried to manage with a single analogue voltmeter: GND to pin 8 and placed the red lead on PIN 6, then removed it and placed on Pin 7. Result: The needle pulsates on Pin 6, while there is no pulsation on Pin7. Does this indicate something? I have not touched the VR1 as it need oscilloscope as you indicated. I have just found an Akai AP207 schematics from Vinylengine site that could apply to AP206C ( See last page 53). I have not cut/pasted it here because it is a bit large. May be that could help.
The 206C service manual has the procedures… you are going to need to find somebody with an oscilloscope.
Would be more fun to borrow the scope or use it…. 🙂.
The procedure is super straightforward, so make sure you have it printed out when you do it or have somebody work on it.
The procedure is super straightforward, so make sure you have it printed out when you do it or have somebody work on it.
All capacitors have been changed. Problem stays the same. The tech will replace all ICs. Only IC TA75458 is not available, can anyone suggest a replacement part?
TA75458 is a dual op-amp, there are many equivalents, lm1458 is a common one.
You shouldn't have any problem getting hold of one. I would recommend having
IC sockets fitted so any future replacements are easy
You shouldn't have any problem getting hold of one. I would recommend having
IC sockets fitted so any future replacements are easy
Yes, any xxx458 dual op-amp should do the job, but be prepared to make some adjustments owing to
tolerances.
tolerances.