Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems.

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Hi!
I need to know if anyone knows where I ca get an IC for a Acuvibe
Massager Mdl 5005C IC#D75402AC.
Vince

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On Wed, 21 Mar 2012 11:13:24 -0600, "Vincent Schmitt"
wrote:

Hi!
I need to know if anyone knows where I ca get an IC for a Acuvibe
Massager Mdl 5005C IC#D75402AC.
Vince

One problem with requests like yours is the information is sparse.

What package is it in (16 pin DIP, 28 pin dip, 44 pin QFP, something
designed to mount to a heat sink, etc)? It MIGHT be a µPD75402ACT,
which is a NEC 4 bit microcomputer. If it is, you are either very
lucky or SOL, depending on your point of view. The microcomputer's
programming is on an internal ROM, without the code it's just a hunk
of sand. Either the owner will have to buy herself a replacement or
you must provide the action.

PlainBill
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It is 28 pin nec, so if I could get one, would it work or would it have to
be programed? My books don't list the thing so where would I get one?
Thank you
Vince

wrote in message ...

On Wed, 21 Mar 2012 11:13:24 -0600, "Vincent Schmitt"
wrote:

Hi!
I need to know if anyone knows where I ca get an IC for a Acuvibe
Massager Mdl 5005C IC#D75402AC.
Vince

One problem with requests like yours is the information is sparse.

What package is it in (16 pin DIP, 28 pin dip, 44 pin QFP, something
designed to mount to a heat sink, etc)? It MIGHT be a µPD75402ACT,
which is a NEC 4 bit microcomputer. If it is, you are either very
lucky or SOL, depending on your point of view. The microcomputer's
programming is on an internal ROM, without the code it's just a hunk
of sand. Either the owner will have to buy herself a replacement or
you must provide the action.

PlainBill

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Posts: 179
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On Wed, 21 Mar 2012 17:05:58 -0600, "Vincent Schmitt"
wrote:

It is 28 pin nec, so if I could get one, would it work or would it have to
be programed? My books don't list the thing so where would I get one?
Thank you
Vince

In the modern age of electronics, books are obsolete. Google is your
friend. There are three problems, however.

1. Googling µPD75402ACT will bring up number of sources for
datasheets, as well as suppliers (chiefly in China) offereing to
supply them. Those suppliers are suspect; the datasheet is 20 years
old. It is likely that newer microcomputers have replaced the
µPD75402ACT.

2. Not just any µPD75402ACT will work. It must have the correct
firmware. The firmware was mask programmed at the time the chip was
etched. There is a programmable version of the IC, it has a prom
(programmable once), but even then you must have the correct firmware.

3. Assuming you can get the correct firmware and the correct IC, you
mist program it. That requires a custom fixture. While the fixture
may be a lot less complicated than that for a 2764 eprom, it still
presents another challange.

Others may differ, but it seems like a lot of work to fix a foot
massager that sells for $7 used on Craigslist!!!

PlainBill

wrote in message ...

On Wed, 21 Mar 2012 11:13:24 -0600, "Vincent Schmitt"
wrote:

Hi!
I need to know if anyone knows where I ca get an IC for a Acuvibe
Massager Mdl 5005C IC#D75402AC.
Vince

One problem with requests like yours is the information is sparse.

What package is it in (16 pin DIP, 28 pin dip, 44 pin QFP, something
designed to mount to a heat sink, etc)? It MIGHT be a µPD75402ACT,
which is a NEC 4 bit microcomputer. If it is, you are either very
lucky or SOL, depending on your point of view. The microcomputer's
programming is on an internal ROM, without the code it's just a hunk
of sand. Either the owner will have to buy herself a replacement or
you must provide the action.

PlainBill


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