Old National IC ???

[ortiko]

Please help to find what is the replacment IC for this old National i have attached at photo.

051-9852


This is for the pcb of my stanley garage opener

Any help will be appreciated

[mann935]

Re: Old National IC ???

I am not sure what your problem is ,but I am mentioning something that I did with a 14" colour tv smps of Panasonic that had came in with smps not working and the switching IC 16 pin had been discontinued , this IC had the vcc pin shorted with ground . On further examination of ic's internal circuit discovered that this IC employed had an built-in 12v Zener at the vcc pin for protection . Used an external voltage and current regulated supply with voltage at 12 volts and gradually increased the current to blow up the internal shorted Zener which did solve the problem and the IC was working again . It's a risk that one takes only at odd times . Take the IC out before trying .

[PeteS in CA]

Re: Old National IC ???

You're not going to like my answer, but I think it's correct. It looks like Stanley special-ordered a batch of some standard IC from National, marked with Stanley's own part number rather than National's number. One purpose would be to hinder "reverse-engineering" by a competitor. Another might be to encourage/force users to get repairs done by an authorized Stanley service center.

So a Stanley service center might be reluctant to tell you what the part really is (if they even know). Another potential problem is that the datecode on the part appears to be "9130", which means the part is 25 years old. It may be obsolete and difficult to find.

[budm]

Re: Old National IC ???

+1

[stj]

Re: Old National IC ???

it's probably a decoder possibly with a rolling code.
or it could be a COP series microcontroller.

seeing the rest of the circuit would help.

[redwire]

Re: Old National IC ???

It could be from the old MM53200 family, circa 1982.

I would recommend ditching it or replacing it just for security reasons.
I had an old Stanley garage door opener and it has no rolling code and a copycat attack works quite well.

You can tune the TX trimmer capacitor if the remote has poor range or is flaky.

[ortiko]

Re: Old National IC ???

Thanks alot all of you are helping alot

It is a stanley coded part from national...

Near this ic is the lm339 ic. It warmed alot and the voltage at vcc pin was 2volt.

Replaced the lm78l82 and voltage is 8.2 V. Also replaced the lm339 IC but the pcb is not functional...
Suppose that this 051-9852 ic is off and if replace it will do the job.

it's probably a decoder possibly with a rolling code.
or it could be a COP series microcontroller.

seeing the rest of the circuit would help.

will upload some pics

[ortiko]

Re: Old National IC ???

And the pics fromthe old garage opener...

[larrymoencurly]

Re: Old National IC ???

Here's a datasheet for a National MM53200 garage door chip, also 18 pins:



Notice the same chip is used for the remote and the receiver. My parents had a Stanley opener that had identical National chips in the remote and receiver, but I don't know if they were the MM53200 because 10-position DIP switches were used to set the code -- 2 positions unused? Later versions of the remotes had a slightly different circuit board, and the chip wasn't National but SEMIFAB.

Here's a thread by KI6KQD, who said he worked at National and designed a garage door opener encodeder/decoder chip for them in 1978: http://www.eham.net/ehamforum/smf/in...c=36855.5;wap2

The limit switch sticking over that long slot is known to crack its solder joints, in which case the opener may crash and jam or even shatter its gearcase cover. The gearcase is polycarbonate plastic doesn't repair well with super glue or even plastic weld solvent, but you can melt the pieces back together with a soldering iron. I had at least one board where a motor relay's contacts burned and one had a relay coil driver transistor blow, as did its protective diode. And another board got hot around some 1/2W resistors that bulged, but I think it was an old one, and the resistors were for some zeners.

[budm]

Re: Old National IC ???

The IC in question is 20-pin DIP with 051-9852.
https://www.badcaps.net/forum/attach...9&d=1478773272

[Longbow]

Re: Old National IC ???

Amazing amount of info given the date of manufacture. The board is divided into the radio section and the power/relay drive section. The National chip in question is in the power section so my first guess is that is might be a simple micro used to sequence the door operation. The LM339's are probably used to drive the relay coils. If replacing the 8.2 volt regulator brought back the proper power rail, see if nearby components are still running warm. I would also have a close look at the soldering at the relay pins.
BTW, are there other voltage regulators on that board? Like a 79l82? 8.2 volts is an unusual relay coil voltage.

[stj]

Re: Old National IC ???

replace the caps, if it's that old then the dc is probably a rectified sinewave by now!

[ortiko]

Re: Old National IC ???

Amazing amount of info given the date of manufacture. The board is divided into the radio section and the power/relay drive section. The National chip in question is in the power section so my first guess is that is might be a simple micro used to sequence the door operation. The LM339's are probably used to drive the relay coils. If replacing the 8.2 volt regulator brought back the proper power rail, see if nearby components are still running warm. I would also have a close look at the soldering at the relay pins.
BTW, are there other voltage regulators on that board? Like a 79l82? 8.2 volts is an unusual relay coil voltage.

Yes there is other two regulators for the other ic'w and they have also the 8,sVolt on them

[ortiko]

Re: Old National IC ???

Just for reference i have purchased a used pcb from the garage technician that installed in first place the door before 25 years an he charged it to me for 120 Euros
I could not wait any more. The door was unlocked.
At ebay someone sells it for 50$

Thanks everyone for posting helpful answers