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'''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: * I'm using external dual-voltage flyback circuit (for much better injector control), so internally the low-voltage flyback is simply connected to EC36pin23 * I'm using pin headers instead of soldered wires, this makes servicing and disassembly neat * I'm using IRF640N FETs instead of the insulated FQPF20N06L drivers for injectors. These are necessary to survive my flyback. V3.5 bottom: http://www.vems.hu/files/GergelyLezsak/v35pics/1_v35bottom.jpg Top: http://www.vems.hu/files/GergelyLezsak/v35pics/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. http://www.vems.hu/files/GergelyLezsak/v35pics/3_flyback.jpg Econoseal-36 in place: http://www.vems.hu/files/GergelyLezsak/v35pics/4_EC36.jpg Frontplate fitted (hammered) to EC-36 to show the final position of EC-18: http://www.vems.hu/files/GergelyLezsak/v35pics/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 http://www.vems.hu/files/GergelyLezsak/v35pics/6_serial.jpg Ground reinforcement on the right side (pink wire, red circles) http://www.vems.hu/files/GergelyLezsak/v35pics/7_ground.jpg Stepper chip populated (blue oval) and pin headers for LCD (red oval) http://www.vems.hu/files/GergelyLezsak/v35pics/8_LCDpins.jpg Solder-blob to enable primary VR chip: http://www.vems.hu/files/GergelyLezsak/v35pics/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: http://www.vems.hu/files/GergelyLezsak/v35pics/10_PS2pins.jpg Bent PS/2 pin header soldered. This position will clear SDCard logger above http://www.vems.hu/files/GergelyLezsak/v35pics/11_PS2pins.jpg Internal MAP sensor board soldered and pneumatic tube connected: http://www.vems.hu/files/GergelyLezsak/v35pics/12_MAP.jpg Another GND reinforcement (red dots, pink wire): http://www.vems.hu/files/GergelyLezsak/v35pics/13_GND.jpg 3 analog input channels and knock(1) connected to EC-18: http://www.vems.hu/files/GergelyLezsak/v35pics/14_BottomWires.jpg All the power drivers (FETs) installed here: http://www.vems.hu/files/GergelyLezsak/v35pics/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 http://www.vems.hu/files/GergelyLezsak/v35pics/16_PS2zener.jpg 4.7k Ohm pullup resistor connected to +5V signal on pin-header http://www.vems.hu/files/GergelyLezsak/v35pics/17_PS2CLKpullup.jpg
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