Hi,
Next week I have a few days off after the holidays and mainly I want to take care of the Hioki, the problems have remained and I don't see the point in spending money again and buying a touchpanel in unknown condition from the China man for almost 200€, not to mention the display.
What's more, the yellowed front panel, which I had managed to get halfway bright after some painstaking work, is as yellowed as before.
So the tasks are as follows.
- New input system
- New front panel
Regarding display/touch panel:
The original system consists of a touch panel with resistive pressure points, which is mounted in front of the LCD display.
The LCD display itself is a monochrome 320x240 in 5.3" size.
Without a schematic it will be very difficult, what I found out is that the display itself is "raw", it expects data in 4-bit parallel format.
This is provided by the Epson chip on the controller board.
This in turn gets its data from the µC, which also processes the input from the touch panel.
It will be very hard to emulate the previous input/output system with today's touch displays.
But my Hioki has a built-in RS232 interface.
Maybe I can "hang on" to it with a new touch display.
The software for reading/inputting from the interface can still be downloaded from Hioki, I'll have a look at it in a few days, I had to buy an adapter first.
Why do I want to go to all this trouble?
Because a comparable device today easily costs €5000 and because I want to work through a "trauma".