Need Help!- Serial port blown by lighting fanuc 10T

[jolulank]

Hi,

I have a Leblond Makino, Baron 25 with Fanuc 10T and last night there was a lighting that hit really near and blew the serial port of the machine, in fact it blew also the serial port of another cnc lathe, a Traub TX8 (mitsubishi control) along with the power supply of 5 computers.
What I need if someone can help me is the schematics of the serial port to find out which integrated circuit to change and if possible also the same information for a Mitsubishi Meldas TL type UL63

Thank you so much for your help

Jolulank

[jolulank]

I forgot to mention that I have been using the serial port almost dialy for over 4 years and never before had any trouble and now when I am trying to send or receive I do get the DATA SET READY DOWN error message.

Settings

COM1
2400 baud rate
7 bits data
parity even
1 bit stop
Xon/Xoff



Thanks again

Jolulank

[Al_The_Man]

The older RS232 IC's that were often used were 1488 & 1489, If you trace the RS232 in/out from the Honda plug, it should lead you to the IC, Older Mits used a different set up, but the reverse engineering method should work also.
I can't recall the IC's used but they are common enough to obtain.
Al.

[zavateandu]

hi

for what i know both machines has a second port cause no machine come with 1 port it has minimum 2 pralel ports so try to change for the other

on meldas i know for sure cause i chnged once on 1 machine for the second portand fanuc should have also.

GOOD LUCK!

[stevo1]

My last 10t had a RS232 on the side of the control along with a second port but it was the 20pin Honda connector on the main board that Al had mentioned. You will have to wire from a Honda connector to a RS232. I did this when I set up the central wiring to all the CNC machines in the shop. I should still have the pinout somewhere. I will try to locate it if you want to get back up and running quickly.

Al….I have never actually had a port blow before or fixed one that was broken (other than rewiring). What do you actually have to do, replace chips?

Stevo

[Al_The_Man]

Originally Posted by stevo1 Al….I have never actually had a port blow before or fixed one that was broken (other than rewiring). What do you actually have to do, replace chips? Stevo

Most of the older IC are still available from DigiKey or Newark.
The prefix may be different but the substitute will have 1488 etc in the number.
The tricky part is de-soldering the old IC, I use a solder sucker, often it is best to snip all the pins and then desolder individual pins, I always solder an IC socket in, this way in future you can just pop the old one out and insert the new one.
Al.

[JimBoyce]

We had the same problem, but the numbers on the chips were SN75188N and SN75189AN. We got them from Mouser. Also the lightning affected the PC serial, so we switched to the other serial port on the PC.

[Al_The_Man]

Originally Posted by JimBoyce We had the same problem, but the numbers on the chips were SN75188N and SN75189AN.

Yes, just a variation in manufacturers # for the equivalent to 1488/89, which I believe was a Motorola IC.
I believe it helps to source the supply to the PC you are using from a 120vac outlet on the machine, often problems such as this come about from a different ground system, especially where the machine sets up its secondary ground system for the control circuit.
In theory they should both be at the same potential but voltage difference can occur, which is exaggerated when thunder storms happen.
Al.

[jolulank]

Thank you all for the quick help. I sure got good pointers to follow. I actually have changed the chips on another machine and had to do the reverse engineering as Al suggested, so I am confident to fix the problem with all your help.

Thanks and I'll keep you posted

Thanks for the chip numbers Steve

[jolulank]

Thanks for the chip numbers Jim

[stevo1]

Originally Posted by jolulank Thanks for the chip numbers Steve

Wow I don't even have to be here and Im helping out.

[Al_The_Man]

Originally Posted by stevo1 Wow I don't even have to be here and Im helping out.

You didn't even see my lips move.
Al.