Sequential Pro One - Page 46

5. Use the set screw from the old wheel if necessary. But don't fulEy tighten it yet--the
wheel still must be trimmed.
6. Reinstall the wheel assembly (bracket) into the top panel. Make sure everything is
safe and switch power on. Trim according to steps 7 or 8 as required.
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7. Rl PJTCH wheel is suppoded to contribute 0 volts when centered. So probe P102-6
(or the wiper of R1 itself) with DVM, With one hand, hold the wheel firmly in center-
detent position. Use a screwdriver to trim the shaft of Rlato read as close as possible
to OV. Move wheel up and down, trimming for best repeatability of OV at center-
detent, then tighten set screw. (The ''deadband" diodes following R1 make this trim
much less critical.)
8. R2 MOD wheel must be able to turn off fully. To trim, simply make sure the wiper
is fully grounded when the wheel is fully down.