Pioneer CT-50R

[J!m]

You could add a trim pot in line but I suspect you have failed/shorted caps somewhere, possibly a voltage regulator on its last leg...

 

[20tajk7]

Looking at the input voltage to my capstan motor I am getting 12.8V. Is that too high and why I'm not able to slow it down enough? Could I put a resistor in line to lower the votage? Thoughts?

These EG530AD motors are used on car decks, so they could get 13 or 14V power supply without issues.
Is the speed changing when you adjust the motor trimpot ?

 

[olman944]

Speed changes but not enough I have a 530AD-2B. Ordered a -2F to see if it is any better. Coming from Nam so it will be a while. End of the month. Going to play around with it and see if anything else might not be working properly. The reverse play is having issues. Just another thing to look at. I worked in electronics for years, not mechanics.

 

[20tajk7]

The 2F won't work as it's a CW rotation, you need a CCW motor, like a 2B.

 

[olman944]

The 2F won't work as it's a CW rotation, you need a CCW motor, like a 2B.

just cancelled it. Reverse play only engages for a second. Head does not turn. (Saw your post on audio Vintage). I'm lost! I had ordered 2 -2B's. Could one be faulty and try the other? Yes, new motor and it plays at the correct speed. Now, the only problem appears to be reverse play.

 

[20tajk7]

Maybe something wrong with the solenoid.
The new EG530AD-2B motors are Chinese knockoffs, they're not as good as the original Mabuchi ones.

 

[olman944]

Maybe something wrong with the solenoid.
The new EG530AD-2B motors are Chinese knockoffs, they're not as good as the original Mabuchi ones.

I really appreciate all of your insights. I found that there is no voltage to the solenoid and I dont have the tools for troubleshooting. It's time to give up I think. Thank you for all of your help. If I do try to tackle it again I'll look forward to checking back in.

 

[20tajk7]

Well just looked at the mechanism operation description in the service manual, the direction switching solenoid (green wires) is only activated during forward play.
So that could be a mechanical problem or oxidation of the autoreverse switch.
Anyway it's also good to stop for a time and get back after getting more experience, that's what I've done on the first CT-50R.

Edit : If you test the reverse mode without tape the automatic stop will engages as the right spindle is not spinning (rotation sensor is on the tape counter pulley).

 

[olman944]

Well just looked at the mechanism operation description in the service manual, the direction switching solenoid (green wires) is only activated during forward play.
So that could be a mechanical problem or oxidation of the autoreverse switch.
Anyway it's also good to stop for a time and get back after getting more experience, that's what I've done on the first CT-50R.

Edit : If you test the reverse mode without tape the automatic stop will engages as the right spindle is not spinning (rotation sensor is on the tape counter pulley).

Can't resist looking again. Checked the voltages on pins 1 and 5 (Green wires) to chasis ground. Forward and Reverse read 13V to ground on both pins. Pretty sure one should be ground. I don't like to assume but I'm thinking it should be pin 5 if the symbol with the 12 pointing to 409-1 is the voltage expected at that point. I don't see a discription of what I'm looking at.

 

[20tajk7]

Well it seems like the solenoid driver transistor is open.
Check Q609, D609 and R630, also check for cracked solder joints, I've had to deal with many of these on my first one.