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SYMPTOMS
• Power supply not plugged into electrical
outlet
• Power cord not plugged into power supply
Carriage assembly
• Power supply not plugged into power
makes no noise
terminal on carriage assembly
and will not go up
• Directional switch on carriage assembly is
or down
in the neutral position
• Terminals in the motor enclosure are not
secure
• Power supply has malfunctioned
• Carriage is pressing against a limit or
obstruction
• Carriage has moved up or down beyond its
Motor runs but
usable range
carriage assembly
• Gears and cogs in carriage assembly are
does not go up
not moving freely
and/or down
• Quick release and brake block on carriage
assembly is secured
• Poor connection between coupling
connecting motor to driveshaft
Chain slaps against
Chain is too loose
upright
Carriage assembly
is slow to change
Chain is too loose
directions
Carriage assembly
"drops" slightly
Chain is too loose
when traveling
down
Carriage assembly
vibrates slightly
Bearing wear
when traveling up
or down
Motor in carriage
assembly is
Chain is too tight
slow and sounds
labored
Ticking noise from
under cover on
Chain is too tight
carriage assembly
Work tray is loose
Bolts under work tray are loose
Upright leans
• Fasteners connecting upright, upright
when stand is in
supports and base not tight
use
• Base is not level
Top tube moves
or shifts in the
carriage, or makes
Top tube bolt is loose
noise when the
carriage is in mo-
tion
• Power supply not plugged into electrical
outlet
• Power cord not plugged into power supply
USB does not
• Power supply not plugged into power
charge plugged in
terminal on carriage assembly
device
• USB power supply terminal in the carriage
assembly is not secure
• USB board has been damaged or has
malfunctioned
IMPORTANT NOTES:
ALWAYS UNPLUG PRS-33.2 FROM ELECTRICAL OUTLET BEFORE ANY ADJUSTMENT, MAINTENANCE OR REPAIR TASKS ARE PERFORMED. NEVER
OPERATE THE PRS-33.2 WITHOUT THE COVER INSTALLED ON THE CARRIAGE ASSEMBLY.
Troubleshooting
POSSIBLE CAUSES
CORRECTIVE ACTION
• Plug power supply into electrical outlet
• Plug power cord into power supply
• Plug power supply into power terminal on carriage assembly
• Push directional switch to the up or down position
• Push terminals together
• Replace power supply
• Reverse direction of carriage assembly and remove obstruction
• Reverse direction of carriage assembly
• Remove obstruction in gears or cogs in carriage assembly
• Loosen quick release lever to release brake block
• Align the flats on the motor shaft and the gear shaft with the
set screw location in the coupling and tighten set screws.
Adjust chain tensioning assembly to tighten chain
Adjust chain tensioning assembly to tighten chain
Adjust chain tensioning assembly to tighten chain
Adjust the three set screws on the carraige assembly (tray side)
Adjust chain tensioning assembly to loosen chain
Adjust chain tensioning assembly to loosen chain
Tighten four bolts under work tray
• Tighten fasteners connecting upright, upright supports and
base
• Adjust base leveling set screws
Apply appropriate strength threadlocker and tighten top tube
bolt to 50 Nm (37 ft-lbs)
• Plug power supply into electrical outlet
• Plug power cord into power supply
• Plug power supply into power terminal on carriage assembly
• Push power supply terminal into USB board
• Replace USB board
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