[Rich_UK]

Hi all,

My first posting to this board so, go easy on me

We have a 1990 (approx) vintage Okuma LB15 Lathe, single spindle, single turret in our shop and have a small problem.

Late last December we had the X axis drive board die on us, something to do with Power Transistors on the PSU bit, and some other work to be done on the PCB attatched above it.

This work was done, the board replaced last week and the machine starts up and ran fine.

However, two days ago I was getting the machine ready for a job, got all the tools set, wrote the program (IGF mode). Program created ok.

Went from EDIT to AUTO so that I could select the new program and I got an error relating to the Bubble Memory. Unfortunately I did not write down the exact error, but machine still worked fine manually. As it was the end of the day the machine was then powered down.

The next day on powering up, the bootup sequence stops almost immediately with the following;

2011 Bubble Memory Read ERROR 20100000 'Parity'

Then you get something to the effect of;
SBC Monitor
>_

And thats it.

Have done the obvious in the back of the machine as in checking for any loose connections, but no joy.

Any advise greatly appreciated.

Regards,

Rich.

[Algirdas]

bubble memory must be replaced. Okuma offers CMOS memory module for replacement. It will work just perfect for long time.

[Rich_UK]

Hi Algirdas,

Many thanks for the quick reply.

Replace the Bubble memory card? Ouch! that sounds expensive.
Are we sure it's a complete failure of the card? or are there any other possibilities?

I have read that doing this will also require the machines software to be re-loaded.

To that end, we don't have it. Tapes/Discs or even a disc drive. Only an old punch tape drive that I never use as the machine is hooked to a PC for program storage.

But besides that, I understand that the machine software is dependant on the machines serial number ie. what options were on the initial order from Okuma when purchased.

Also are there other major parameters that might require setting up after this as well, say backlash or other?

Regards,

Rich.

[Algirdas]

This module maybe €2000 approx. Call Okuma representative to do all the job. SBP monitor means OSP can't load operating system. Maybe OS must be re-installed. Depends, which memory module is failed.
You have saved copy of parameters, as instructed, right? Don't worry then.
Joke. I don't know a single client who takes care of backups.
It's all possible, don't worry.

[Rich_UK]

Hi Algirdas,

No backups of parameters.

And as the machine stops at the Loading:SYS bit then I guess there is no chance of getting to them.

Looks like I will have to make some phone calls on Monday morning then.

Thanks again,


Rich.

[Rich_UK]

Hi,

Just as a followup to my previous post.

We have checked the all the voltages on the CPU Racks power supply unit. All are as they should be.

However, with the machine at its stalled boot up state, on the front of the CPU rack there are other LED's for status.
And the Power and Run LED's are not lit.

I dont know, but I would have thought that the Power LED would be lit even if the RUN one was not due to a possible loss of data.

Rich.

[fordav11]

the commands in the monitor allow you to look at memory locations, do debugging of code etc. it wont help you unless you know 68000 assembly language and are familiar with programming notation in hex and binary. in other words if you were not a computer programmer back in the 80's forget it.

you really just need to replace the bubble board as stated above.
If your name is accurate you shouldn't have a problem. Otherwise you should probably change your name to 'Poor UK'

think carefully...... your machine has been doing nothing for a year. how much money would you have made in that year if the machine was running? answer: a hell of a lot more than 4000 GBP. if that machine was at my work we would have lost about $1.2 Million

[Rich_UK]

hi all,

Thanks for all the replies.

Looks like it's definitely a dealer only fix then.
I have just been trying all options to see if it was caused by something else ie bad connections somewhere or blown component is in psu or something.

Have to wait and see what the new year brings.
Not my decision on authorising the repair.

Thanks to all who gave input during this thread.

So closing out the thread.

Rich.

[Algirdas]

after paying this they "could not guarantee it would fix the fault"
correct statement. You can't tell if there are no more problems until machine didn't started. That means, Okuma representative at U.K. is responsible person and isn't lying to make client to hear what he wants.
Back to the subject, sorry for distraction.
You can test Your bubble memory on someone's else machine before spending a fortune.

[JasonMiller]

Rich,
there are a number of bubble memory cards for sale on eBay for about $350USD. Back when my memory board gave up I purchased a couple of used ones, worked like a charm. If you don't have the system install disks, you'll still need to get these. You'll also need an Okuma floppy disk drive to install them.

Good luck!

-Jason

[valdaz]

2011 Bubble Memory Read ERROR 20100000 'Parity'
SRAM chip malfunction or PCB damaged by corrosion.

[Algirdas]

The power on sequence failure and Bubble Memory kaput. Condolescences . . .

[3BMTS]

Hello

Our problem is dead Okuma LB-10m
Fault:
2000 Memory write/read test ERROR 0008866C (Last code, changes after turn ON and Off)

Okuma is Oldscool 1987''
We have a Perfo line and reader
-8" coll Floppy, whit out reader.

Memory size is - 4mbit X 3

Controler OSP5000

How? Step?

And 8" floppy reader - were found it? Or, parameters can manual whrite? Or only whit floppy? About 8" floppy emulators/ mb is way, if I get all info from 8" flopy, copy it to 3/4 flopy, and whit emulator or smtg, use it, to start machine. 8" reader is from Museum.

About CMOS memory, Used is good idea, to buy?