It would work in manual mode only. TTL only worked with the CP-9AF. This is what
Heritage Camera has to say. They have both
Compatibility
This flash is designed for the Chinon CP-9AF 35mm SLR camera. It's compatible with all exposure modes including program, and sets the shutter speed and/or aperture in various modes as required. TTL flash control and AF illuminator features are provided.
It can be used manually on other Chinon cameras such as the CE-4, CE-4S, CA-4, CA-4S, CG-5, CE-5, CP-5, DP-5, CP-6 Spot, CP-X, CP-7M and 35EE-II, plus other cameras made by Chinon and sold under other names, such as the Sears KSX-P, Agfa Selectronic 2 and 3, Revue AC 3S, AC 4SP and AC5 and others. The shutter speed is set automatically when the flash is charged, and flash ready status is shown in the viewfinder. As these cameras don't support TTL flash, you'll need to calculate the required aperture using the distance scale on the flash. Please check our other listings for flash units dedicated for these Chinon cameras. On suitable 35mm compacts with a hot shoe and flashmatic feature such as the Chinon 35 and 35-EE, you set the guide number on the camera, and the aperture is adjusted automatically depending on the distance.
Here is the manual if you are interested:
chinon af-s280 camera flash, instruction manual