Making probes

 

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There is virtually an unlimited number of different ways in which leads can be made up for your EEPROM connections.

Below are some suggestions to get you started.

Using clips MAY at first seem like a great idea however they can be far worse than what you are trying to avoid, which is holding 2 needles in place for a few seconds which is much easier and less expensive than sourcing and mucking around with clips or WORSE soldering to the pins.

I recommend using 2 long needles [NOT Stainless Steel] and a GND clip, You only need the GND clip if you are using another ThinkPad to view messages from KMX, when using Zap SVP button with a USB port from the locked ThinkPad supplying power to KMX then the GND connection has already been made by the USB connector GND.

All KeyMakers are shipped with a 4 way lead

KMX1

KMX2

 

There are many different ways that you can take in making up your own probes to use with your KeyMaker.

Below is one way it can be done, 2 ordinary [not Stainless Steel] long needles and a clip [any alligator clip] is all you need.

Above the finished article connected to the KeyMaker board's I2C connector

Dual 4 way male header inserted into the end of the 4 way lead with additional cables soldered to one side of the header, colours matching the layout of the KeyMaker board's I2C Connector below.

Note: Ordinary sticky tape used for insulation.

Another way of making a cable with 180 Ohm 0.25W resistors in series with the SDA and SCL cables, heat shrink used to protect the resistors etc

KMX1 as shipped with a 4 way cable with a locking connector on one end.

Note: the clip, pins, resistors, heat shrink and extra cable length are NOT supplied.
You will need to source those yourself.

If you do not have a soldering iron, you can strip the ends of the new cables, twist the ends together then hold the cable in place and insulate it by wrapping with tape.

 

At the other end of the cable a long steel pining needle (no, NOT stainless steel as that will NOT work) 

Note the insulation provided in 2 places by sticky tape, at the top to prevent sweaty fingers interfering electrically and at the tip to prevent short circuit in places where the pins ends very close to each other, see R52 photos further down this page.

In my example the wire is soldered, you could also wraps the stripped end of the cable around the pins and cover with sticky tape.

Label the 2 cables SCL and SDA near the needles.

For the GND connection we use a larger hook clip, it needs to be larger as it usually connected to a metal bracket inside the TP for the GND connection. Read more on -> GND connection

 

All done.

You can also use heat shrink tubing to insulate your probes

Now putting it to use on 2 versions of the R52

The black GND hook on the left above, connected to the metal fingers which hold the memory in an R52

Photo from the EEPROM location pages, showing the connections for this version of the R52

Now you can appreciate the need to wrap the lower part of the pins with insulating sticky tape or heat shrink tubing as the needles do end up very close together.

The other version of the R52 board.

Again the connections from the EEPROM location page

The probes applied to SDA and SCL, this time they are even closer together, so it is a good idea to have the ends of your probes insulated with either sticky tape or heat shrink tubing.

Note the GND clip on the left clipped to the metal finger which normally holds memory in place.

Other ways to make your leads.

The Pomona SMD Grabber Test Clip Patch Cord is ideal for clipping your SDA and SCL leads to EEPROM pins.

You only need one test lead, cut the cable in half and use one half for SDA and the other half for SCL, you should attach a label near the end so you don't confuse the 2 leads. 

You can find the Pomona leads easily by searching on the net.

Below, photo from a customer who purchased 2 different colour Pomona SMD Grabbers (pairs), cut them in half and used one Red and One black clip for SDA and SCL plus a larger black clip for GND

 

 

Pomona clips applied to an 8 pin 24Rf08.

NOTE: You will need very good lighting and a magnifying glass to attach these, these are large macro photos, the actual 24RF08 and its pins are very small.

STRAIN RELIEF - you can easily apply sufficient force to damage the 24RF08 pins with these clips, take care.

To avoid damage, make sure you place no strain to the pins by using adhesive tape to tape the cable a short distance from the pins so that any pulling on the other end of the cable does not translate to strain on the 24RF08 pins.

These clips can also be used with the 14 pin 24F08 which has even more delicate pins, so the strain relief and care is even MORE IMPORTANT.

 

 

 

Another customer supplied photo, he used the supplied 4 way cable connected to a Pomona SOIC-CLIP 5250 which is suitable for connection to an 8 pin SOIC for example the 8 pin 24RF08

3M also sell a SOIC clip, 8 pin version depicted below

The problem with using SOIC clips is the area immediately around the pins has to be clear of components else you cannot get the clip down far enough to make contact with the pins, usually there will be components in the way, so the clip cannot be used.

 

 

DO NOT MODIFY THE SOIC CLIP BY GRINDING PLASTIC AWAY else there is NOTHING to exert pressure to contact the pins

DO NOT DO THIS !

 

Disclaimer

I make no warranty that any of my information is correct, or safe, or does or does not breach any warranty clause,  or anything else, it is up to you to decide if you will follow all or any of the instructions to recover the Supervisor Password from a TP. It is up to you to decide, I am not responsible for the results or for any consequential or incidental damages whatsoever.

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