[Michael Maurice]

Edward, you dont know the machine, I doubt if you've ever seen one, let alone worked on one.

For the record, the speed control board is crystal controlled, and the various speeds are obtained by dividing down the oscillator.

There is no dedicated control circuit, perhaps you might explain what you mean by TTC board and CC board as I've never heard of these terms.

If you dont know what you are doing Then please do not comment!

Chas,

Do you have the manual?

I think you can rule out the tape transport logic board, it operates the same for all three boards.

If the speed goes off spec, the lamp goes out, (you can easily try it) I therefore think you can rule out the TDA1000 and TCA560

Check that the tape lifter is free to move and not sticking.

I can't offer any more advice than this.

I may have spare boards if you want to borrow one.

Michael