MembersPage/GergelyLezsak/AssemblyThreePointFive

This page is about assembling a 3.5 board with pics (hope it's useful for someone).

Some stuff which is not common to factory installs:

V3.5 bottom:

1_v35bottom.jpg

Top:

2_v35top.jpg

Internal flyback and supply-voltage inductance connected. I use external dual-voltage flyback (MembersPage/GergelyLezsak/FlyBack), that's why flyback connection is a simple wire here.

With high-Z injectors or ballast resistors it is preferred to use a 30V zener diode here.

3_flyback.jpg

Econoseal-36 in place:

4_EC36.jpg

Frontplate fitted (hammered) to EC-36 to show the final position of EC-18:

5_EC18.jpg

Both Econoseal connectors soldered and two bottom wires (green) of RS-232 serial connection. After this is done, the board is ready for a bench-powerup and communication test

6_serial.jpg

Ground reinforcement on the right side (pink wire, red circles)

7_ground.jpg

Stepper chip populated (blue oval) and pin headers for LCD (red oval)

8_LCDpins.jpg

Solder-blob to enable primary VR chip:

9_VRtrigger.jpg

I'm going to use 90-deg. bent pin header for PS/2 keyboard input. It's just placed on top of the processor:

10_PS2pins.jpg

Bent PS/2 pin header soldered. This position will clear SDCard logger above

11_PS2pins.jpg

Internal MAP sensor board soldered and pneumatic tube connected:

12_MAP.jpg

Another GND reinforcement (red dots, pink wire):

13_GND.jpg

3 analog input channels and knock(1) connected to EC-18:

14_BottomWires.jpg

All the power drivers (FETs) installed here:

15_FETS.jpg

5v1 zener diode installed to PS2-pin header, to protect PS2/CLK pin, for wheelspeed input. Note that this SMD diode is originally not supposed to be here, I just found a ground nearby using a PCB through-hole

16_PS2zener.jpg

4.7k Ohm pullup resistor connected to +5V signal on pin-header

17_PS2CLKpullup.jpg