For the era, I'd have to guess with some feeling of certainty Mitsubishi made the Volvo 240 CR-2170 stereo radio / cassette. Also used in 700-series with a different fascia.
Blaupunkt was replaced by Mitsubishi in the mid / late 1970s / early 1980s and later came the Alpine audio schema for all Volvo models, AFAIK. There may be some overlap.

Image from post:
https://ozvolvo.org/discussion/5799/volvo-cr2170-mp3-conversions
On the PC boards you may find a Mitsubishi maker's mark. They may have made the cassette transport motor also or the motor may be made by Nidec. Maybe Panasonic?
A video indicating Mitsubishi:
https://www.youtube.com/watch?v=dMHBh3HQMU4
Another video testing a working CR-2170
https://www.youtube.com/watch?v=4_WCLd0KLfQ
A few other you bube toob videos there to find treating the CR-2170.
You may want to research the Turbobricks forums as many threads on factory Volvo radios and there restoration and care, as well as modding them to accept digital device inputs, there.
http://forums.turbobricks.com
Maybe find some used on the Turbobricks classified? Requires account to view.
A useful discussion for you?:
http://forums.turbobricks.com/showthread.php?t=114932
I find these on eBay also.
You may want to ask Franke Ponte in New Jersey. His running advert is here on the ClassAds:
https://www.brickboard.com/CLASSADS/index.htm?id=16851
While the oddly-shaped 240/740/940 speakers in 240 were made by Dynaudio of Denmark through the 1990s and beyond, the radio and radio / cassette makers changed. There may be other brands of car radio maker in the 200-series dash. I'm unsure.
An accessory catalogue that shows the Mitsubishi amp atop the images CR-2170 connected via the DIN jack at rear. Or the CR-2170 had the power amp mounted in a box at the backside of the head unit.
http://www.240.se/litteratur/83acc.pdf
At issue would be PC-board level and tape transport mechanism component failure. With enough of these, you may be able to piece together a working unit? Though may be pricey to collecting these to do so. And to make them bulletproof. Yet I seem to recall how the button on these would fail. Broken PC mount solder welds or a failure of the switch contact in the button.
May want to check iPd classifieds also for 240 / 740 parts that may include your radio model.
https://www.ipdusa.com/classifieds.asp
Hope that helps.
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