Looking for a UPD547LC tuner control processor made by NEC around 1980

MikeBettinger · 6th November 2010, 06:45 PM

I'm looking for a UPD547LC and possibly a UPD2815C.

I'm attempting to restore a classic tuner that needs a UPD547LC and possibly a UPD2815C. I've had no luck with the legacy parts dealers and I'm hoping someone might have one or both sitting in their ancient stock pile. Also any data sheets or maybe even a suggestion of a product that used them to help me track them down would be appreciated.

The UPD547LC handles a very basic 3X4 button matrix to control tuning and 6 station memory. It is also the display driver for the fluorescent display, which is also very basic displaying only the station frequency. The UPD2815C handles the interface to the front end varactors and other tuner housekeeping. I don't think it's the problem as the display is actually locked up, displaying all segments and no button control. The tuner was a prototype circa 1980.

I would like to get the thing alive again and I'm not looking to nickel and dime to find the parts.

Any help here would be greatly appreciated.

Mike

stoc005 · 6th November 2010, 06:52 PM

As a former Apps. Engr for NEC, you are out of luck. There should be some dash numbers after the main PN. This is the code that is put into it by NEC. Nobody makes those parts anymore, not even NEC. Too old and it's a custom. Sold only to owner of the code. Try and find another unit (Ebay??) to salvage for parts.

MikeBettinger · 7th November 2010, 01:05 AM

Quote:

Originally Posted by stoc005

As a former Apps. Engr for NEC, you are out of luck. There should be some dash numbers after the main PN. This is the code that is put into it by NEC. Nobody makes those parts anymore, not even NEC. Too old and it's a custom. Sold only to owner of the code. Try and find another unit (Ebay??) to salvage for parts.

That's not what I wanted to hear

But I guess it makes sense. So, NEC would give the chip the functionality the customer was looking for and the code was an indicator of how it was programmed and they were the only one with access to the chips from NEC?

Thanks for your input as it puts an end to a very frustrating search.

Regards,
Mike

stoc005 · 8th November 2010, 02:22 PM

If it's a Vac. Flor. drive part, it is an old PMOS part that is obsolete. Even if you owned the code, nobody makes them. They were mask programmable.

6th November 2010, 06:45 PM	#1
MikeBettinger diyAudio Member Join Date: Jan 2006 Location: Virginia	Looking for a UPD547LC tuner control processor made by NEC around 1980 I'm looking for a UPD547LC and possibly a UPD2815C. I'm attempting to restore a classic tuner that needs a UPD547LC and possibly a UPD2815C. I've had no luck with the legacy parts dealers and I'm hoping someone might have one or both sitting in their ancient stock pile. Also any data sheets or maybe even a suggestion of a product that used them to help me track them down would be appreciated. The UPD547LC handles a very basic 3X4 button matrix to control tuning and 6 station memory. It is also the display driver for the fluorescent display, which is also very basic displaying only the station frequency. The UPD2815C handles the interface to the front end varactors and other tuner housekeeping. I don't think it's the problem as the display is actually locked up, displaying all segments and no button control. The tuner was a prototype circa 1980. I would like to get the thing alive again and I'm not looking to nickel and dime to find the parts. Any help here would be greatly appreciated. Mike __________________ "We are all agreed that your theory is crazy. The question which divides us is whether it is crazy enough to have a chance of being correct. " Niels Bohr

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6th November 2010, 06:52 PM	#2
stoc005 diyAudio Member Join Date: Feb 2007 Location: Midwest in the USA	As a former Apps. Engr for NEC, you are out of luck. There should be some dash numbers after the main PN. This is the code that is put into it by NEC. Nobody makes those parts anymore, not even NEC. Too old and it's a custom. Sold only to owner of the code. Try and find another unit (Ebay??) to salvage for parts.

8th November 2010, 02:22 PM	#4
stoc005 diyAudio Member Join Date: Feb 2007 Location: Midwest in the USA	If it's a Vac. Flor. drive part, it is an old PMOS part that is obsolete. Even if you owned the code, nobody makes them. They were mask programmable.

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