Galaxy DX-2547 on IC 3 where is pin 8?

[Adamf]

Hi all, on the Galaxy DX-2547 can someone tell me which pin is pin 8 on IC 3? Thanks, Adam

 

[sp5it]

Lol, check datasheet.

 

[Adamf]

Hi, thanks for the post but not quite that simple to find a data sheet, part is RCI8719-99. Does anyone know if the DOT on the IC chip is at pin 1? Thanks, Adam

 

[Adamf]

OK all, I figured it out. Adam

 

[Handy Andy]

This is sad...

Any typical DIP outline is STADARDIZED - meaning that to obtain even a sellable part, it cannot be anything else but this - it's a standard set by ISO for compatibility reasons -

​

Comparability reasons stated as a replacement for the MB8719 - even to able to be a drop in...READ Compatibility

Locate pin 1 in this diagram...
If you cannot find it in this diagram
you may need to locate a local tech
to help guide you...

​

I guess it just has to be said somewhere in this forum...

So you know - if you are looking for Pin 8 - Pin 8 is NOT the last pin on an MB8719, RCI 8719 or any type of 8719 PLL chip - ok?

You're in a 2517 - are you sure you are using an MB8719 / RCI 8719 or something more exotic like say a MC145106???

Hoo -boy...

 

[Handy Andy]

OK all, I figured it out. Adam

Good!

 

[loosecannon]

Remember when Secret CB put in their book that the MB8719 dot was in the wrong place?

that sure caused some confusion that lasted years.
LC

 

[Handy Andy]

Ok, let's look up some stuff about Pin 8...

Here's what Galaxy uses on their own EPT boards...

Now that MB8719...
Page 1


Page 2

Page 3 -
MOST IMPORTANT...

Page 4 - the Dead giveaway...
​

Ok, that's straight from a Datasheet - so you claim to have an RCI8719 in a DX2517...?

Ok, your story...

Pin 8 on one chip is a VALIDATION process of Lock Detect...

On the other...

It's the return signal OUT for clocking on the Main Xtal...

You'd be better off letting a technician handle that radio - It appears that you have problems identifying the parts involved ....

Good luck...

 

[Adamf]

Hi, thanks but I did clearly say I had the DX-2547 not a DX-2517.....I may be getting older but I can still read a part number. Thanks, Adam

 

[Adamf]

Here is pic of IC3 in DX-2547.

 

[Handy Andy]

Then when you post that, Pin 8 there's nothing on it...it's the PLL's clock-out signal not used...

That was why I showed the PLL stuff...


With Galaxy under the RCI umbrella, it is too easy to fix the right radios with the wrong parts...

Especially since they're done away with the 3600 series and introduced at least three different series of boards to their lineup...(6900-696-929 - just for starters)

So when you mentioned you had the "11" board - there are too many of them (referring to radio "types") using 10D or 11Z to give you any straight answer excerpt to give you the datasheet...

Pin 8 isn't used in one, but on another it is used for Lock function, but uses a different chip

No matter what - you can't be too sure about anything...

 

[Adamf]

OK, probably why using pin 8 in one of the adjustments did not work. Thanks again, Adam

 

[tighthide]

Hi, thanks for the post but not quite that simple to find a data sheet, part is RCI8719-99. Does anyone know if the DOT on the IC chip is at pin 1? Thanks, Adam

If you're looking down at the chip and the Trimmer Cap VC1 is above it, Pin 8 of IC3 is the second pin of the top row counting from the left.