I've recently bought a set of used ancient Bowens equipment including:
           1 Quadmatic 3k
           1 Quadmatic 3kH Flash head
           2 Quadmatic 1.5kH Flash head

           1 Quadmatic 2002
           1 Quad 2002
           1 Quad 2002 Flash head
           1 Quadmatic Spotlite
           1 Adapter Type 1 "For QMSpotlite or QM2000 with Quad2002"

My top interesting question:
Can the 2002 heads and/or Spotlite be used with the Quadmatic 3k unit?

Where can operating manuals be found?
Can anyone scan and upload somewhere and post a link?

The Quadmatic 2002 unit needs (according to seller) new capacitors and won't fire flashes but the modelling lamps work.
Would a change of capacitors be hard for someone reconably good at electrics?

On top of the Quadmatic 2002 unit there is group of four white switches numbered 1 to 4. Each switch has a lamp above it and the text IN and OUT is written above and below the group of switches.
What are these switches used for?

> www.oldtimercameras.com/instruction-manuals/search/mfrsearch.asp?MainMfr=15

Thanks Peter but I find it outragrous to charge €10.40 for a 5-page instruction book dating 30-years back, probably not including postage.

I'll write to Bowens and kindly ask them to release all old material under a Creative Commons license, or similar, to the general good. If they don't care to scan the manuals thay can mail me them and I'll feed them to my scanner and produce PDFs to share.

Regarding changing of capacitors I conclude that the article you linked to contained a dialogue where one part seemd highly skilled but it did not give out any real usable information except that the parts was said to be very expensive. No specifications to the capacitors to use etc is specified.

The Spotlite head has a fan in it and it works so that is no concern.

Lars,
different voltages and wiring makes them incompatible both ways. The heads, starting with the Quadmatic, are compatible up to the present.
As for Hans Strobl, well he was the chief mechanic at Hensel in the days Hensel was a major Bowens service in Germany. Noone knows more about Bowens flashes of the 70th to 90th...
As said, the 2002 caps (voltage/farrad) will be hard to find because a lot has changed over the years in regard to caps technology. I'd enquire at shops like EHFFS www.ehffs.co.uk or www.camerarepairer.co.uk about a quote.

Sorry, should have read "starting with the Quadmatic 3k / and kH heads...", emphasis on the k. IIRC production started about 1980. All older, non k heads/packs are not compatible to the newer series.