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Quote:
Originally Posted by 112stereo
Have now fitted all new belts and it works and sounds great, never heard my tapes sound so good........amazing.
However, the draw still won't work.
I am thinking that when the draw is moved it sends a small voltage to the chip which activated the draw circuit.
I have checked all I can and all looks ok, I suppose it could be the chip its self, I have no way of checking without a scope which I no longer have.
Does anyone have any ideas ?
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Am not familiar with the 5000 so cannot offer much of real use. Been having a quick look at the 5000 (but model 4716) on my mobile which is not easy.
This shows there are 2 active low control signals "Tape deck in" and "Tape deck out", these drive the motor via transistors.
The control signals connect to pins 13 and 12 of 1IC1 which is the 40 pin 8048 microcontroller chip.
So I would expect the "Out" signal to go low and the "In"
signal to go high when Open is requested and vicer versa for a close request. I see from the User manual a close request is done by selecting Open again when deck is open.
You could monitor these 2 signals with a DVM set to DC volts (this assumes it is practical to access 1IC1.
I cannot easily see how the 8048 determines that the deck is open or closed, there is some sort of protection circuit control at pin 6 but don't know how that works.
The Open button itself goes to pin 31 but this is a strobed signal so you might need a scope to see it changing state properly.