Electronics
Simple Immobilizer SMD EEPROM Removal and replacement
When you replace your 2001, 2002 or 2003 Toyota RAV4 ECM (car computer or engine computer) with an used unit, either bought at eBay or at a salvage yard, junker, etc., if your vehicle is equipped with an immobilizer system, which is an anti-theft security system, you must either reprogram the ecm to work with your existing keys, or buy new keys, which must be cut and programmed for matching the ECM unit you just purchased.
In this article, we will cover the part where the ECM is reprogrammed, as that is the easier way, and will use as an example the 89661-42820 RAV4 ECM. That part number is to mention just one, as this procedure will cover all 2001 – 2003 models, either 4×2 or 4×4 wheel drive.
For reprogramming, if you Read the rest of this entry
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Reading and Writing Immobilizer EEPROMs in Circuit
Sometimes when working with immobilizer EEPROMs, the ideal way of programming the EEPROM is by doing it while it is in the circuit, as removing it, programming and resoldering it back to the circuit, adds a bit more of effort to complete the job.
Doing it “in-circuit” can be accomplished by using the SOIC-8 clip, connecting it over the EEPROM chip while it is in circuit, but sometimes, some inconveniences are present. Some of those inconveniences are; the need of cleaning the EEPROM leads from any protecting coating the ECM might have, or the fact that the EEPROM in question might have a too low profile, making it impossible to keep the clip in place, or the situation that we will cover here; the ECM circuit is too sensitive to the voltage that the EEPROM programmer injects to it, for working (reading/writing) with the EEPROM. In this case, the problem is that the micro controller of the ECM is attempting to start (run) with the reading supplied voltage. Of course, thus will vary from ECM to ECM and from programmer to programmer.
The solution for this situation is Read the rest of this entry
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Simple Resistor Color Code Calculator
This is for 4-color rings resistors, either rated at 5% or 10% tolerance. It will not calculate the precision 5-color bands resistors having a tolerance of 1%.
The color ring for tolerance, which is the fourth one, either gold or silver colored, is ignored here since it is not critical on most applications. It basically tells that the represented value in colors, may vary for a range of a 10% (from -5% to +5%) from the actual value if this ring is gold colored, and 20% (-10% to +10%) if it is silver colored. Most modern regular resistors are marked as 5% tolerance (gold), which is fairly acceptable.
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What about DVD regions?
What about DVD Region codes?
DVD region codes identify a DVD’s compatibility with DVD players typically sold in a particular region market. It is a system developed to encode DVDs to prevent them to be played on Countries not intended to.
The only exception is Region “0″ (also called “region free”). Region “0″, is compatible with DVD players from any region. The majority of all current DVD titles play only in one specific region unless Read the rest of this entry
