🇩🇪 Robotron KC 87: Part 1 (First look & Power supply) [TCE #0543]

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Australia The Clueless Engineer
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Published on ● Video Link: https://www.youtube.com/watch?v=dvp0HFrgDU8


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The Robotron Kleincomputer (Small Computer) KC 87 is an East German (or DDR if "East Germany offends you) microcomputer released in 1987 and designed around their U880 (or UB880) processor, their clone of the Z80. The other computers in this range were the Z9001 and the KC85/1 ... not to be confused with the KC85/2, KC85/3 and KC85/4 that are different computers produced by a different factory.

00:00 ... Intro
01:30 ... Examining the exterior
06:00 ... Dismantling
10:00 ... Removing the keyboard
12:00 ... Close-up of the motherboard
15:50 ... Removing the power supply
18:30 ... Dismantling the power supply
21:00 ... Testing the DC output - NOK
26:00 ... Removing the power supply from its case
31:30 ... Testing the encapsulated mains filter
35:25 ... Trying to replace the 10nF 630V safety capacitors
42:30 ... Trying without the encapsulated mains filter
43:40 ... Close-up of the power supply
46:09 ... Channel thanks & outro

The power supply is supposed to output ±5VDC and ±12VDC ... but does nothing at the moment as it keeps shorting and blowing the 500mA fuse.

An ASMR description of the computer ... 🧐
   • Soft Nails ~ ♥ [ASMR] Kleincomputer Ro...  

Maybe the PSU schematic:
https://www.sax.de/~zander/kc/kcsch_6.pdf

Some other interesting links I've found:
https://oldcomputer.info/8bit/kc85_1/index.htm#pin
https://nadjabuttendorf24.com/kc87.php
https://hc-ddr.hucki.net/wiki/doku.php/z9001
https://oldcrap.org/2018/05/02/robotron-kc-87/

Discussion about replacing the 166-5551 encapsulated mains filter (in German):
https://www.robotrontechnik.de/html/forum/thwb/showtopic.php?threadid=16520

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