Safety Precautions to
ensure that your KeyMaker Board and ThinkPad are not damaged
In order to avoid damage to your KeyMaker
Board as well as the ThinkPad you are using it on, there are certain
precautions you MUST observe.
If you ignore these
precautions you will join the 3% of customers who bought a KeyMaker
board - ignored these precautions and damaged their KeyMaker Board
by being careless - then had to pay to have it replaced - and lost a lot
of time in the process.
Your KeyMaker has electrical contacts on
both sides, you must ensure that no part of your KeyMaker USB board
comes into contact with any conductive surfaces such as bare metal or
You should place down a piece of paper
and place your KeyMaker USB on top of it in order to avoid any
electrical contact which may damage your KeyMaker.
There is no danger of receiving an
electrical shock from your KeyMaker USB as the highest voltage anywhere
on the board is 5 Volts which is a safe voltage to touch.
If you prefer you can place your KeyMaker
USB board inside an Anti-Static plastic bag during use, the board
does not get warm at all, so there is no issue with ventilation.
The same precautions apply to your
ThinkPad when you are performing any operation and BEFORE your ThinkPad
is switched ON, you must ensure that nothing can short out by coming
into contact with other parts, you can use sheets of plastic or plain
paper to make sure things remain electrically isolated.
You MUST NOT allow the SDA and SCL
leads from any KeyMaker KMX1 or KMX2 to come into contact with ANYTHING
other than the correct SDA and SDA EEPROM connections points and ONLY
You have traced the
wire you are using for your probe right back to the label on the I2C
header on the KeyMaker board which reads SDA for YOUR SDA lead and
reads SCL for YOUR SCL lead.
You have absolutely
confirmed that you have correctly identified the SDA and SCL
connection points on your ThinkPad System Board.
3% of customers who purchased a
KeyMaker Board have somehow managed to damaged their KeyMaker board.
NOT ONE of those customers can tell me
exactly what he or she did to damage it.
I have tried all sorts of seriously
ridiculous ways to damage a KeyMaker board and I have NOT BEEN ABLE TO
DAMAGE ONE !
I only tried MILDLY STUPID THINGS like
connecting a solid 9 Volt source to SDA and SCL - theoretically that
should have damaged the I/O pin on that KeyMaker powered from 3.3 Volts,
Your KeyMaker board is a delicate
piece of equipment, treat it with respect.
Do NOT experiment or connect to
anything if you are not certain you have the correct connection points
There are voltages much higher than
3.3 Volts inside your ThinkPad, in fact up to 20 Volts.
20 Volts is not a danger to YOU but it
is to the KeyMaker KMX1 or KMX2.
Connect SDA and SCL leads ONLY if you
have double checked and are CERTAIN you have correctly identified SDA
and SCL connection points
The above is VERY IMPORTANT - don't ignore it else
you WILL damage your KeyMaker KMX1 or KMX2 board and that is expensive,
wastes a lot of time and is not much fun.
more on Safety Precautions here
Most people can simply ignore
the 93C46 EEPROM, it is only found in a few really old TP models
The most common EEPROMS used to store
passwords in TPs are LSI, 24RF08, 24C01 and very rarely 24C03. These
EEPROMS can be read without unsoldering them from the system board and
normally require only 3 connections GND, SCL and SDA.
Those 3 connections points are clearly
labelled on the KMX1 Board (white silk screen writing on the board)
The 93C46 EEPROM is very different, it
needs 6 connections and it MUST be unsoldered from the board in order to
recover the password stored in it.
ONLY unsolder a 93C46 if you have;
The right Surface Mount Device (SMD)
You have experience at using those
If in any doubt about about your ability to
unsolder a SMD 93C46 - I suggest you don't do it, rather have someone else
who does this for a living do it for you.
If you cheerfully go ahead and you don't
know what you are doing and lack the tools and skills required, you will
simply ruin the System Board and EEPROM
The following information is for those
possessing the right tools and skills.
KMX1 connection point to an unsoldered
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.