The Bits
Here are all the bit's you'll need to assemble the MegaJolt board (Molex connector not pictured).
|
Starting off
First thing to attach is the Molex connector. I used a couple of pegs to hold it flat against
the board.
|
The 5v power unit
Now solder in the 4 diodes D2, D3, D4 and D5. And the 2 capacitors C1 and C2 noting the negative
terminal goes as in the photo. Now solder in U3 and the 3 jumpers R12, J1 and the one to the left
of the processor.
|
Testing for 5v power
Using a multimeter test the 4 labeled points on the board. Red is positive and blue is negative.
1 - processor
2 - oscillator
3 - MAP/TPS
4 - MAX 232
|
Next step
Now solder in the rest of the components excluding the processor, MAx232 and oscillator. At this
stage I also modified the board to take a TPS input (see bottom of page for details). Once everything's
in place, test for 5v at the four locations as above.
|
Finnished
Once you're happy 5v is in all positions you can solder in the final 3 components. I again tested
for 5v but that's probably an over kill. If you've done everything correctly, nothing should happen
when you attached power (i.e. no smoke!).
|
Molex pins
This pic has all the various pins on the Molex labelled for easy wiring up. Do note I've labelled
this for a TPS modified board so is slightly different (no prog 4 output).
|
Testing
Next step is to see if it actually works! I plugged it into my laptop and checked that the Megajolt
software could communicate ok with it. Also, test the TPS changes the readings in the software as you
rotate it.
|
Here are all the bit's you'll need to assemble the MegaJolt board (Molex connector not pictured).
First thing to attach is the Molex connector. I used a couple of pegs to hold it flat against
the board.
Now solder in the 4 diodes D2, D3, D4 and D5. And the 2 capacitors C1 and C2 noting the negative
terminal goes as in the photo. Now solder in U3 and the 3 jumpers R12, J1 and the one to the left
of the processor.
Using a multimeter test the 4 labeled points on the board. Red is positive and blue is negative.
Now solder in the rest of the components excluding the processor, MAx232 and oscillator. At this
stage I also modified the board to take a TPS input (see bottom of page for details). Once everything's
in place, test for 5v at the four locations as above.
Once you're happy 5v is in all positions you can solder in the final 3 components. I again tested
for 5v but that's probably an over kill. If you've done everything correctly, nothing should happen
when you attached power (i.e. no smoke!).
This pic has all the various pins on the Molex labelled for easy wiring up. Do note I've labelled
this for a TPS modified board so is slightly different (no prog 4 output).
Next step is to see if it actually works! I plugged it into my laptop and checked that the Megajolt
software could communicate ok with it. Also, test the TPS changes the readings in the software as you
rotate it.
Solder in 2 lengths of different coloured wire (red for +5v and white for TPS input) to the
MAP sensor pins as in this photo. Also remove diode D7 and transistor Q8 from your board
if you've installed it as we're sacrifing programable output 4 to use as the +5v for the TPS.
The white wire goes through the mounting hole for the MAP sensor (which we're not using)
and onto the N/C terminal of the Molex connector. The red wire goes where D7 used to be. This
allows it to connect to PGM 4 of the Molex connector.