[Info-vax] Personal Workstation 433 rescue guidance

[Crabs]

On Monday, June 14, 2021 at 9:36:53 AM UTC-7, Larkin Nickle wrote:
> I’ve acquired a Personal Workstation 433, but I can’t get it to work. When powered on, the green light on the front turns on and I can hear the disk spin up, but there’s no serial or graphical output. The power light on the motherboard turns on but none of the diagnostic lights do. If the CD-ROM drive is connected to IDE, it shows no signs of life, but if connected to power only then it blinks, ejects, etc. just fine. The machine doesn’t even beep with all RAM removed. I’ve reseated just about everything and have also checked the PSU’s voltages and they’re all good. Any suggestions?

There are 8 small leds on the upper motherboard between the processor and the ram, during the boot process they flash in a particular sequence.
Somewhere there is documentation that will tell you what each combination means, but if they aren't flashing at all during the boot then the upper
motherboard, or something on it has failed.
Check to see if the right RAM is installed, it must be in identical pairs, 66MHz or 100MHz (133MHz won't work) ECC CL3  Synch 3.3v 168-Pin DIMM Memory,
up to 1.5gb total.

 'Crabs