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They look like wire wound resistors, but I can't be certain. I wouldn't replace them unless they measure open circuit, or are physically damaged. CW

The resistors have cooked the board, but the traces don't look damaged. C11 might be bulging slightly, and it's proximity to the scorching hot resistors is probably the cause. I'd re-cap it and see what happens. I'd also check the resistors and see if any have opened due to heat cycling. CW

That is likely the source of the SCSI-B error, and can be ignored. CW

E is time-of-year clock C is serial port 6 is SCSI-B 1 is ethernet (probably not terminated) I don't know if the SCSI-B failure is an issue or not. The others shouldn't be a problem. Make sure the SCSI goes from the interface card to each drive and back to the interface card. There shouldn't...

Is there any documentation on these 'special' DEC parts besides the block diagrams that show up in various appendices? I've been looking for more documentation (prop. delay, pin drive, etc) on the DC101, DC003 and DEC8646 chips. I'm suspecting I'll have to pull them from a working board and...

I hadn't considered platter sag. I always assumed the on-edge storage was to fit more in a cabinet, but it make sense. Fortunately, they have been in a DEC RL02 cabinet for the last 20+ years. CW

I'm preparing to move, and I need to box up ~25 RL02 cartridges. What is the best (correct?) way to package them? They aren't going to be shipped, but they will be loaded/unloaded by people that I suspect won't honor 'FRAGILE' markings. My current plan is to buy some 16x16x12 double wall...

Depends on your patience and level of skill. It looks like most of the Cypress parts and at least two DIMM sockets will have to be removed. I hope you have a good SMD hot air station. Given that they are $500+ on ebay, I'd say it is worth it. CW

Disclaimer: I know nothing about this subject. If memory serves, certain 11/23 CPUs contain boot ROMs that know how to control a DEQNA, so my guess would be the 11/23 would try to boot from a MOP server hosted by the VAX. The boot file should be named based on the ethernet address of the DEQNA...

I can't find any documentation online for the LQP02 (schematics, etc). If you have hardcopies please scan them so they can be added to bitsavers. I found schematics in the LQP02 tech manual on manx. It sounds like there is a short on the digital board which causes L1/L2 to burn out. A likely...

Both those options should work electrically. I didn't check the physical size. CW

Unfortunately, I've already put them away. I'm in the process of painting, so everything is piled under tarps. I did look at an older machine, and it matches the schematic on bitsavers. Page 65 shows the component placement, and C5 (just below the power connector) is a visual match. The parts...

I looked at one of my 3100s, and I have the same board. On closer inspection, I believe the component is an old style tantalum capacitor based on the pin protruding from the positive end, but I don't have any idea of the value. Like yours, mine doesn't have any visible markings. I think I have...

Puzzling. The M38 should have a KA42 motherboard, but it doesn't match the component locations in the online documents. Perhaps it's a different board revision? It's also possible the motherboard was upgraded to a KA43 (M76) without re-badging the case, but that seems unlikely. In any event...

What model 3100? The KA42 schematics are on bitsavers (here), but they don't match the component locations shown in your picture. CW

The spindle lock may not be unlocking. Check the manual page 6-20 to see how to bypass. CW

The B indicates it is an optional software component. See DEC Standard section 21. Curiously, BI-xxxxx isn't listed. CW

Some of the Chinese PCB houses will assemble for a reasonable price. Others here have gone that route with good results. CW

The MSV11-R schematics are part of the 11/84 print set (MP-02015), and they list two xx47xx capacitor options: 0.47uF 25V Ceramic (20%) and 0.047uF 50V Ceramic (+80%/-20%). CW

DECstations will not run VMS since they are based on the MIPs processor. DECstations will only run the MIPS version of Ultrix (and maybe NETBSD). All VAXstation, VAXserver, MicroVAX, and VAXen will run VMS. Most flavors of VAX will also run Ultrix, but you should check the SPD to be sure...