Optimiser Assembly Guide

PCB layout
C1 - 10uF Tantalum
C2,C3 - 27pF
C4 - 0.1uF
VR1 - 10K
X1 - 8Mhz
U1 - The Optimiser chip
R1 - 2K7
R2 - 10ohm
T1 - BC549

Notes

R1, R2 and T1 are only required if you have the backlit LCD.
VR1 is used to adjust the LCD contrast. It seems to require nearly full clockwise rotation to make LCD visible.
The latest Optimisers ship with 2 potentiometers. This is for future usability improvements and 2nd is not currently used. The 2nd should be wired in parallel with the 1st with the wiper going to pin 39 of the ECU. A small hole drilled in the PCB next to the pin is one way to do this.

Assembly and testing

  1. Prepare the case, drilling holes for the buttons and potentiometer and for the LCD. Mount the buttons and potentiometer onto the case. The PCB needs to be mounted against the back panel for the RJ45 connector to fit. This will required removing some of the stand offs. Make sure not to remove the ones required for closing the case. Some cutting of the PCB corners can help fit against some posts
  2. Attach wire to the buttons and potentiometer and LCD ( but not to the PCB just yet ). All push buttons have one side connected in common ( to 0V on the PCB)
  3. Solder all the components, noting polarity where required. You will probably want to lay X1 flat against the PCB.
  4. Next wire the LCD to the board. Note pins 7-10 of the LCD are not used. If using a backlit LCD don't forget pins 15 and 16.
  5. At this stage it is possible to check basic operation. By applying 5V( note the polarity ) to C1 it should be possible to see characters on the LCD. I usually have to turn VR1 fully clockwise to set the contrast.
  6. Wire the 4 buttons to the PCB and the potentiometer. The button common connects to pin 5. Make sure the wiper of the potentiometer connects to the top hole ( pin 40 of U1 ) By applying power to again you should be able to navigate the Optimiser menus.
This picture shows the LCD connected to the PCB.
Note this brand requires reversal of pins 1 and 2.
Click for larger view.
The potentiometers are connected.
The buttons are connected

Suggested Optimiser layout to suit supplied case

Dimensions shown are in millimetres. Check against the actual dimensions of the LCD as this can vary depending on the brand of LCD provided

Panel layout