Digital Rainbow PC100B Power Supply

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Revision as of 07:30, 9 February 2022 by Luminescentsimian (talk | contribs) (add WorkNeeded categories and a photo)
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For general information, see more on Wikipedia: Device
This device is in the WorkNeeded:OriginalParts category because it was flagged as missing information on the original parts. It may have replacement parts listed but those cannot be assumed to be identical to the originals. If you have a list of the original parts, please feel free to add them by copying the relevant table from EditorsToolbox:Tables
Digital Rainbow PC100B
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Preliminary Information
Release Year 1982
Leak Risk Unknown
Batteries None
Mounting Technology Through Hole
Capacitor Types Aluminum Electrolytic?
Destructive Entry No

The Digital Equipment Corporation Rainbow PC100 is an odd amalgamation of a VT100, Z80-based CPM computer, and early DOS PC. It has both a Z80 and Intel 8088 CPU on the same motherboard an the system ROM also supports running as a VT100.

Wikipedia

Known Issues

Symptom or Problem Encountered

The circuit breaker immediately trips when power is switched on.

Causes

  • power transistor failed, shorting the 12V output to ground

Solutions

  • Replace the failed transistor and also a diode array that had also failed-short

Disassembly Notes

It comes apart really simply. 4 screws to take the top of the case off, two more to detach the IEC socket, then disconnecting plastic connectors to be able to get to all of the screws holding the board down. There was one security Torx screws (size?), the rest are #2 Phillips.

The parts that went bad for me are circled in this picture:

Original Parts

Basic PCB Name

Note model numbers and board revisions here

Capacitor Specifications and Footprint Information
RefDes Qty Capacitance Voltage Mount Diameter/Size Temp Type Brand Series
0 µF
ICs Specifications and Footprint Information
RefDes Qty Part # Mount Type Brand Series
1 BUV48A TO-247-3
1 FE16C TO-220

Replacement Parts

Basic PCB Name

Capacitors
RefDes Qty Compatible Part Number Order Links
1 ST BUV48A Digikey
1 NTE6240 https://www.digikey.com/en/products/detail/NTE6240/2368-NTE6240-ND/11648400

If parts are not available or different selection is preferred, you can use the values in the Original Parts section to perform a parametric search.

Kits

Related Links

References