I try to repair servopack yaskawa varispeed 626MTII, after power supply fault, I have broken positioning card. I found some pdf for 626MTII but only width simple magnetic sensor positioning card. My card are based on 8031 CPU and using encoder. I found similar card in 626MTiIi pdf but it's not...
Yesterday I try to start control on machine, spindle gearbox start work after some relay clining, but servo work only in one direction. Old thyristor drive fault, I think it's SAA146 IC problem, but it's not avaliable, I found SAA145 and wait for delivery. All linear encoders work properly.
After lot of work, first succes - i found misconcection on two pin 6522. I replace socket and it's start working.
List of all founded problem:
Broken vreg ic in 5V section, broken power transistor, short cap in -15v and broken 7915, broke ram and cpu on NPC52, broken contact in socket...
Today i go to company sold this type of machine width control fault for EPROM dump, i drive 400km ( Its not to long in USA standards but its half of my country), but all NPC52 eprom have fault A0 pin.
I think that eprom are ok. I dump it and disassembly, code look good. Using logic analyser I check that NMP52 board wait for communication from npc52, checking control register of mc6821 in loop. I found this adres and check in program code.
Npc52 - drive keyboard and respond to simple command...
I dont't have lot of time for this project but after some measurements i found 7915 vreg fault, -25v go directly to output. I order new one and try. Still don't have schematic for power suplly section.
I replace 7915 and found broken bc547 transistor shorting and driving relay in emergency...
Hi, I have problem width CNC2101 controler, after repair 5v and -15V power supply section, all power led's light, on front panel led "?" on and CRT show "00". I found it's supply voltage below 18V. I have schematic but power suply page are missing. Maybe voltage control circuit fault ? On RAM...
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