Hi All,
I am keenly following this thread, as I need to reset the Km on a three window cluster I'm using to replace a single window one in my VX commodore. The local agents indicate it's about $300 to get the Km adjusted, on a VX cluster, and can't be done in QLD. I also have a silver face plate level 2 cluster, which I think maybe from a VT.
What I have is as follows,
1. Single window VDO level 2 cluster, stamped by GM 25/01/01 (this unit has a white base and a silver face plate, and has a completely different printed circuit backplane to the three window unit)
2. Three window VDO level 3 cluster, stamped by GM 8/12/00 (this unit has a black base, and has the NEC pd780828 microcontroller)
3. The single window cluster in the vehicle.
I have downloaded the 7808 microcontroller series user manual, and it indicates there are 7 or 8 wires need to be soldered onto the chip 'in circuit', connected to a programmer, to modify data memory, or presumably the program. It indicates the display data memory is located at address FA64H to FA7FH.
Has anybody had time to research these microcontrollers?
thanks