Re: Philips N4450
Progress:
I fitted BC237's instead of the AC128 as they're pin-pin comparable. After sorting out a dry joint they work ok.
However I now have a fault on one of the tape tension units.
If you press <play, the LH motor starts up with very low torque then stops.
If you swap tension boards then the same happens to the RH motor when >Play is pressed.
I think they should both spin but with reduced torque.
I've changed the transistors both BC547's, I've checked the 4K7 preset and its OK and I've checked for dry joints.
I should add that FF and REW both work correctly.
So whats next?
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