Here are things to check:
Moisture, raspberry like moist well drained soil, not too wet or dry.
Insects, check for spider mites and aphids,; look at the backs of leaves, use a magnifying hand lens for spider mites.
Nutrients especially iron, may be tied up and unavailable, or lacking, especially in alkaline soils.
Compare your care plan to this reference
Soil test instructions, fee schedule and sampling form is available here-