Where may I get a circuit diagram of the Hasselblad PCP 80 from 1992

https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&cad=rja&uact=8&ved=2ahUKEwjxk5bfxZSCAxUGAHkGHTyEDeIQFnoECBEQAQ&url=https%3A%2F%2Fwww.fixya.com%2Fsupport%2Ft29937410-slides_in_hasselblad_pcp_80_projector&usg=AOvVaw37cFYwFluHNcwezWpCyYtO&opi=89978449

Couldn't find circuit diagram but this might help.

you can try a forum such as the link below, press the helpful button
Photography Forums

Send to a repair facility like CRIS or United camera repair. This is something mechanical that cannot be repaired at home.

From my PCP80 Service Manual:

FAULT: The projection lamp is lit for a short moment and then goes out. POSSIBLE CAUSE: 1.The rectifier and lamp change board are out of order. AND/OR: 2.Both triacs turn on. Both lamps are lighted until the automatic circuit breaker is released. MEASURES: 1. Change both boards. 2. Change the triac board.

See Also:

FAULT: The projection lamp does not light. POSSIBLE CAUSE: The automatic circuit breaker has released. MEASURE: Reset the circuit breaker. AND/OR: Fuse F102 has blown. MEASURE: Change the fuse. AND/OR: The rectifier and lamp change board are out of order. MEASURE: Change both boards. AND/OR: The triac board is out of order. MEASURE: Change the board.
Good luck!

http://butkus.org/chinon/hasselblad/hasselblad_503cw/hasselblad_503cw.htm

Dear Sir,

According to your request i am providing download link
Circuit diagram for Grundig 5441 tv. If you have any problem regarding this issue come back with more information about the problem,we will glad to assist you



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in PDF format download High resolution complete Circuit Diagram
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Good Luck

This site has a link to downloading the manual:

http://www.butkus.org/chinon/hasselblad/hasselblad_503cw/hasselblad_503cw.htm

Those speeds tend to hang up from lack of use. You can try exercising them by cycling through the speeds, but it will most likely need service. The lubrication on the gear train has probably dried up, it is a common problem since those speeds aren't normally used.

Try the following reset:

Hold the OK and the Help button at the same time. While holding them down, plug the power in. Continue to hold both buttons until the unit shut off.
After shutting down, release both buttons and power on the printer.

Alternatively follow instructions on this document from HP.