Cnc2102 Eprom dump

[Eryk M. (Firma: PSG) (erykcnc)]

Hello, I have problem with deckel FP3a controler CNC2102 MNP51 board - 
display stuck o  00 and not responce to keyboard. I need eproms dump 
from MNP51 or NMP50 from CNC2101 to test system.

[Mario M. (thelonging)]

Error 00 is emergency off or PLC undervoltage. Check cables and 
connectors and the power supply. There is no need to fiddle around with 
the EPROMs.

[Eryk M. (Firma: PSG) (erykcnc)]

I repair plc board  5v and -15v section. Now plc lamp "?" go off after 
Ein and i can switch on collant pump and spindle breaker.
Undervoltage - i have schematic but power section are mising. I dont 
understand communication between plc and processor board.
00 is always on, if i remove all axis cards, ram card and serial 
communication card is still on. I change all 6821 I/O chip and check
cables. On CRT i have only 00 and nothing else.

I check all ram chip on beeprog programer.

My idea is CPU schow 00 and stuck on error in code but its only idea.

[Eryk M. (Firma: PSG) (erykcnc)]

https://youtu.be/xs1PdLXSjgw
Movie from machine.

[Eryk (Gast)]

I dump all eprom-s from this controler and disassembly code. In first 
look code have lot of errors but i use 6800 disassembler and on board i 
have 6809 - more 16bit cpu. After this hange code look good.