An attempt strictly from memory to provide a generic overview. Your BS should probably be similar regarding adjustments:
1. Kill power to the saw.
2. Remove the blade
3. Loosen the blade guides.
4. Open the top & bottom doors & get a good straight edge.
5. Lay the straight edge against the face & near the hub of both wheels.
6. Use a flash light to see how well the top & bottom wheels bear against the straight edge. Also check out the near the OD of the wheels for reference.
7. This will give you a good idea of how well the wheels are aligned in terms of parallelism & planarity.
8. Using the lower wheel as the reference to adjust from, adjust the upper wheel, if necessary, for parallelism using the tilt adjustment.
9. When the wheels are parallel to each other, then you can adjust for co-planarity
10. For co-planarity, add or remove shim(s) from behind the top wheel hub to get both wheels on plane.
11. Install the blade, spin the wheel & adjust the tilt mechanisn to center the blade.
12. Once the wheels are co-planar, & the the blade is centered, you can install the blade guides.
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