14. If a failure is suspected, the following inspection should be conducted.
Symptom
Inspection target
Troubleshooting
The beeper sounds continuously and
the chair will not move at limit setup.
Measure the potentiometer voltage.The
operation is prohibited around 0 V or 5 V,
which are potentiometer limits.
Reinstall the potentiometer to the chair.
The beeper sounds continuously at limit
setup whereas the chair is operable.
The wiring to the potentiometer may be
improper. Check the no. 1 and 3 lines. If
the symptom is momentary, the condition
is normal.
If the lines are connected opposite to each
other, correct the connection according to
the wiring specifications.
The chair will not move.
LED 2 is off.
Check for power supply.
The chair will not move.
LED 1 is off.
Check if prohibit all input is present or not.
Operation from the unit unavailable.
Check the transmission LED on the unit.
If the LED on the unit is off, the malfunction
is caused by poor connection or open
circuit.If the LED on the unit is on, check
for baud-rate consistency and set up as
required.
Operation by foot SW unavailable.
Check for open circuit between the SW
and the p.c.board.
The identical positions set for preset,
auto-return, and rinsing slightly move in
actual operation.
Check the margins.
Increase the margins.
The preset position is not reached.
Check the margin.
Decrease the margin.
The preset position is exceeded.
Check the margin.
Increase the margin.
The chair is not moved by pressing a
SW.The beeper sounds while the SW is
pressed.
An input to prohibit the chair operation is
present. Cancel the input to confirm the
kind of prohibit signal.
Cancel the prohibit input.
The beeper sounds at power on and
stops when a SW is pressed. The auto
operation is disabled thereafter, and
the manual operation works only in one
direction.
Open or short circuit of the potentiometer.
Measure the voltage using a multimeter
to check for the malfunction.
Repair the open circuit, replace the cable.
The stop position of the chair becomes The position of the potentiometer is
Check for loose installation of the device
The legrest does not extend by preset
switches.
Check the set up position of legrest.
Manually extend the lrgrest for setting-up.
Extend the legrest in independent mode to
the limit position and set the preset.
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