Kurzveil k2000s freezes when entering the disc mode

Synth Repair
1

Good day to everyone. I got Kurzveil k2000s, and it has a serious bug: when i’m trying to enter disc menu (“disc” button) machine freezes - no sound, no response from buttons and keys. So, i need to reboot after this it works again.

I thought, that it was dead tact button or more complex program bug, but when i insert floppy disc, it works ok and boots programs and sounds from it.

I tried to connect scsi2sd unit (when machine off of course): it boots up and freezes.

I think it’s a scsi problem, may be diode or fuse. I experienced such problem on Akai s3000, when scsi diod protector was blown.

I am new to this machine, and need an advice, what to check?

Thank u for your input!

2

I have the exact same issue with my Kurzweil K2000RS. Please keep us up to speed on what you find out.

Thanks,

Stephen

3

So, I have details to share. The issue is NOT an engine board issue. It’s something happening on the power board. I have a feeling that it is PSU related. I need to trace the power to the rail.

The symptom would indicate that the SCSI bus is NOT getting enough power to wake the drive and allow it to be selected. This in turn locks the device because it is hung expecting to see available SCSI drives.

More later.