Display tester GTB 80B
Tester of GTB 80B displays.
Very simple mounting to check the operation of alphanumeric display 2 x 20 of the SYSTEM 80B.
Presentation
We conducted a simple device (using an external power) to test our pinballs 80B gas displays.
Prototype
For this mount we have adopted a "Low cost" solution by retrieving a former display 7 digit SYS80A as a printed circuit board. The old components were dessoudes and instead we installed new using a few straps. We thus keep a directly usable connector and then simply cut the circuit to get a presentable board. This tester is essentially designed around a PIC 16F628A that send commands to the display module.
The device is connected to the display by a standard SYSTEM 80B wiring, power comes to plug into the third connector of the cable.
Achievement
Following many requests and our prototype working perfectly, we decided to produce a small series of modules. Installation is now in a much more professional finish and we have the opportunity to simplify (it has more than a single LED).
Assembly of the board presents no difficulty, the schema of implantation is downloadable below:
In the end, the module with its printed circuit board, with serigraphy, double-sided, metalized holes:
Full wiring diagram:
Compatible displays
All displays of the SYSTEM 80B, 2 lines of 20 characters, can be verified by this tester, which included modules:
- MA-664 - SYSTEM 80B, 1st generation
- MA-999 - SYSTEM 80B, 2nd generation (larger)
On the other hand, the SYSTEM 3 (MA-1361) displays are not compatible with this tester. Although gas displays is the same as the SYSTEM 80B of second generation, the control unit is totally different.
As seen in the photo, the electronic circuits used are not at all the same. To also be able to troubleshoot this type of display, we create a specific tester for SYSTEM 3.
Distribution
This achievement is available in our shop.
