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New diodes tested the same as the old... now what to do?

Also discovered a couple of the big ceramic resistors at the top the the SDU were not checking out to their specs -- the 15kohm was 9.9kohm and the 50kohm was 37kohm. Any idea where to get these? The...

1993 Okuma LR15
VAC Drive, not VACII, D22A


Here's the situation:

1. I was running some parts, came in for some lunch and when I made it back to the machine I had an SDU error, the top board...

The same thing happened to my machine a few months ago, tripped a breaker on the machine. I didn't notice the caps so I reset the breaker, turned it back on, and it popped again, this time with my...

Bubble memory parity error usually means the bubble memory board is shot. The bubble memory is like a hard drive, the operating system, parameters and programs are all stored there. When you start...

My OSP chassis has a problem booting. The computer chassis shows UV alarm for 5, 12, and 24v. However, I don't think UV is the real problem. The chassis tries to boot as soon as you turn on the...

Well the machine is happy now. I let it sit a while, and it decided to work again. Of course, while it was sitting, the coolant went bad. I ran a month of steel parts dry, no issues. Then I started...

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...

Book says resolver II issue. I opened up the turret housing and found the inside to be quite disgusting. At first I suspected a dirty proximity switch. It was dirty, and is now clean but no luck....

I always like to follow up on these open issues.

Input voltage to the machine has always been great.

I had a tech come out and we determined the voltages at the front panel were problematic....

So I was just running the LR15 and after loading a part hit cycle start and nothing.. ?? I look up and the screen is blank. Lights, hydraulic etc.. still running but machine does not respond to...

FYI Update:

The machine decided to work for a few more months with parity, read/write, general IO errors occurring more and more frequently. Eventually it would not boot anymore and something had...

Well so far the machine decides when it wants to run or not. We don't have a TON of work for it, certainly not urgent work anyhow. I have the disks that came with the machine and have pulled all the...

Poor me.. I got a parity error on my bubble memory last week. I have an additional good bubble memory card to swap in.. does anyone have the manual/proceedure for reloading the software/initializing...