Kurzweil HUB7, Manual, Page: 50 / 56

RSP8 Diagnostics and Troubleshooting
Appendix A-8
similar range. If the actual range is much smaller than this or hits
+127 or -128, you may lose some resolution or range in actual use.
Joystick movement also draws on the joystick display area. Look
for smooth tracking without sudden jumps or jags and also a
reasonably round total movement area that closely approaches or
just kisses the boarders. Finally there are two bar displays just to
the left of the joystick display. The “R” (radius) bar shows the
handle's distance from center and the “TH” (theta or angle)
moving dot shows the angle on an imaginary clock face with
12:00 being at the center. Rotating the handle around the limits of
movement should produce a constant length bar on the R display
and a smoothly moving dot on the TH display. As with the
control knob display, the rightmost soft button clears the joystick
display. Also, while the adjacent soft button is held down,
drawing will be suppressed.
Power Voltage – Just under the joystick X,Y display is a reading
of the incoming power voltage. This will generally decrease as
the backlight is made brighter (see Main Encoder above) or
increase as it is made dimmer. At the brightest allowable setting
(160), the voltage reading should be at least 4.00V for proper
operation. Brie
fl y higher settings (not over 30 seconds) are
allowable for margin checking. If the voltage reading is low, the
likely cause is a cable that is too long for its wire size or possibly a
defective cable which has one of the 4 power and ground wires
open. The 16 meter cable supplied with the RSP8 will typically
give a reading of 4.48V with a backlight setting of 160.