The motor runs, but the blade doesn't go up and down, or it's locked in one position. Fix:
Page 10 (Blade change) and Page 16 (Exploded view of blade holder). Bosch Pst 52a Manual Fixed
typically uses a . Unlike modern "SDS" quick-change systems, this older model often requires a screwdriver for blade replacement: The motor runs, but the blade doesn't go
Here are the key points from Alex's experience with the Bosch Pst 52a Manual Fixed jigsaw: The motor runs
Never use silicone-based sprays inside the PST 52A. Silicone fumes can destroy the triac speed controller. Use only plastic-safe contact cleaner.