SYMPTOMS POSSIBLE CAUSES CORRECTIVE ACTION
Carriage
assembly
makes no noise
and will not go
up or down
• Power supply not plugged into electrical
outlet
• Power cord not plugged into power supply
• Power supply not plugged into power
terminal on carriage assembly
• Directional switch on carriage assembly is in
the neutral position
• Terminals in the motor enclosure are not
secure
• Power supply has malfunctioned
• 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
Motor runs
but carriage
assembly does
not go up and/
or down
• Carriage is pressing against a limit or
obstruction
• Carriage has moved up or down beyond its
usable range
• Gears and cogs in carriage assembly are not
moving freely
• Quick release and brake block on carriage
assembly is secured
• Poor connection between coupling
connecting motor to driveshaft
• 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
• Tighten set screws in coupling
Chain slaps
against upright
Chain is too loose Adjust chain tensioning assembly to tighten chain
Carriage
assembly is
slow to change
directions
Chain is too loose Adjust chain tensioning assembly to tighten chain
Carriage
assembly
"drops" slightly
when traveling
down
Chain is too loose Adjust chain tensioning assembly to tighten chain
Carriage
assembly
vibrates slightly
when traveling
up or down
Bearing wear Adjust the three set screws on the carraige assembly (tray side)
Motor in
carriage
assembly
is slow and
sounds labored
Chain is too tight Adjust chain tensioning assembly to loosen chain
Ticking
noise from
under cover
on carriage
assembly
Chain is too tight Adjust chain tensioning assembly to loosen chain
Work tray is
loose
Bolts under work tray are loose Tighten four bolts under work tray
Upright leans
when stand is
in use
• Fasteners connecting upright, upright
supports and base not tight
• Base is not level
• Tighten fasteners connecting upright, upright supports and
base
• Adjust base leveling set screws
Troubleshooting
IMPORTANT NOTES:
ALWAYS UNPLUG PRS-33 FROM ELECTRICAL OUTLET BEFORE ANY ADJUSTMENT, MAINTENANCE OR REPAIR TASKS ARE PERFORMED. NEVER
OPERATE THE PRS-33 WITHOUT THE COVER INSTALLED ON THE CARRIAGE ASSEMBLY.
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