Sk@rbrain Lincoln II Analysis

We are lucky with the readership of the blog that some write, spent time researching stuff that I find amazing and then are willing to spread this with the wider readership here. This is the same as the information below. I am not responsible for this and credit entirely Sk@rbrain (his name when the message was sent) and of course this can be updated as and when the permission is granted.


A long time back when people thought there was software for the Lincoln I put photos here how Ralf 121 had got the words PC on his radio, mine the same but the board was really hot around the CPU.


So as I understand the diagrams were checked, researched and below are the details of the messages sent to me about the radio:

Comment: Just for grins and giggles, I found the schematic for the President Lincoln II. And the reason why the board around the CPU got hot is because of the port wiring. The Data TX & RX are the only lines being used by the radio. The USB port on the radio is not wired as standard to the Mini B USB configuration.

Radio configuration:

Pin 1 is the V+ line and is shown as not connected however may be terminated to the board.
Pin 2 is the RXD1.
Pin 3 is the TXD1.
Pin 4 and 5 are terminated at ground.

This is from the #MUSB-BSF-105 (J506) which is then wired to CON3 (J507) as a three wire connection.

Pin 1 being RXD1.
Pin 2 being Ground.
Pin 3 being TXD1.

Con3 (J507) is plugged into the motherboard at CON3 (J504)

Location on schematic Row A Column 8 “Lincoln-2-CPU-V3 20140304”

If others (like myself) used a normal Mini B USB cable, it could possibly cause damage to the radio, the usb cable or both.

Cable (There are a lot of “standard” wiring configurations in the wild):

Mini USB pin out:

Pin 1: VCC 3.3 to 5.0 vdc
Pin 2: Data –
Pin 3: Data +
Pin 4: ID (Type A; Grounded, Type B; Not connected)
Pin 5: Ground
Pin 6: (Shield) May be a floating ground or not connected.

I hope this sheds some light on things. I am still looking for a “software package” to see what it does.

73 de Sk@rBrain

So the initial message sheds some light on the issues and after we made contact another time here is the follow up message from Sk@rbrain:

Greetings again.

Thank you Simon

Actually it only took me about 30 minutes to figure out what the problem was. The reason for that was I just purchased the Lincoln II and was curious what that port did.

So with a bit of searching, I found the schematics online, and knowing about the different types of connectors and such for the computers, it was as easy as putting 1 +1 together

And getting 2. That is what I have intentions of doing just that.

Another reason why the board got hot is I found that there is no level converter and it may be trying to apply RS-232 voltage levels directly to the CPU. This is only speculation because

We don’t have the cable they are using.

If I find out anything else, I will drop you a line. Oh feel free to add what I posted to you on your site.

So thanks indeed.. An excellently explained article about the radio. I am just sorry it took so long to add due to being swamped here. There are more things to come, including a new forum home for the Pirates.

All words are copyrighted to the man who sent them me. I know his name now, location and this article and words of the article are his, not mine except the initial opening comments.

All Rights Reserved (c) 2013-2014 Unathorised Use / Or Duplication of this material without express and written permission from this blog’s author is strictly prohibited. Excerpts and links may be used, provided that full and clear credit is given to simonthewizard and with appropriate and specific direction to the original content.

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