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 KM9, VCC, GND, SCL and SDA are silk screened on the KM9 PCB
NOTE: You ONLY ever use VCC
connection if you are reading or writing to an UNSOLDERED EEPROM,
in every other instance you do NOT connect VCC at all.
If you are using a KM8 LCD with your KM9 the
24XXXX connection points are show below
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)
unsoldering/soldering tools
-
You have experience at using those
tools properly.
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.
KM9 connection point to an unsoldered 93C46 EEPROM
In the image above, I bent and inserted a 2
pin header to highlight the 2 additional connection points of the KM9
board.
Your KM9 is shipped with a 6 pin header
which can be snapped apart to make one 4 pin header and one 2 pin header.
The extra header pins are useful when reading or writing to a 93C46 EEPROM
If you are using a KM8 LCD board plugged
into your KM9 board, then the EEPROM connections consist of 6 header pins
in a row
Labelled above are connection points for an
UNSOLDERED 93C46 EEPROM
The 93C46 can ONLY be read or written to
after it ahs been unsoldered from the system board, you should only
attempt to read a (3C46 if you in fact have the tools and know how to
unsolder a tiny surface mount chip without destroying it, do not even try
this if all you have is a big soldering iron.
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)
unsoldering/soldering tools
-
You have experience at using those
tools properly.
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.
You MUST solder a 0.1uF ceramic capacitor
between the 93C46 VCC and VSS pins.
NC means there is No Connection at all to
that pin.
Pin 6, ORG MUST be connected to VCC
All other pins connected to the same
labelled pins on KM9 LCD EEPROM connector
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.
