After Service; Self Diagnosis Function - Yamaha JW-II Service Manual

After Service

The is equipped with a self-diagnosis function that monitors the control system. If a problem
occurs in the system, power-assisted travel is discontinued. If this happens, turn off the power switch
and use manual travel.
•
If a problem is detected, the external LED lights or flashes, and both wheels stop simultaneously.
•
If this happens, the item for which an error was detected is displayed by the LED on the inside of
the wheel, only on the side on which the error was detected. (The LED on the other side remains
in its normal display mode.)
•
In the error item display mode, the nature of the error can be determined based on the number of
times that the LED flashes.
•
Flashing patterns are separated by two-second intervals in which the LED does not light.
If the LED is flashing four times:
1
LED displays
External Internal LED
LED Display Display
Lights for 3 Lights *1
seconds, then
remaining
battery power is
displayed.
Lights Flashes once
Flashes twice
Flashes three times
Flashes four times
Flashes five times
Lights *1
Flashes rapidly Flashes once
Flashes once/goes
out
Lights *1
Goes out *1
Goes out *2
Flashes slowly Lights *1
Goes out Goes out
*1 If the LED lights and goes out when the hand rims are moved (torque input display)
*2 If the LED does not light even when the hand rims are moved
*3 The torque sensor error mode goes on when the power switch is turned off and then on again.
*4 Mainly the battery and the area around the battery should be inspected (this may be activated by
traveling down a steep incline, in some cases, to protect the equipment).
2 3 4
Off
Beep
One short
beep
One long
beep
↑
↑
↑
↑
↑
↑
↑
↑
↑
↑
Four short
beeps × 4
Four short
beeps × 2
None
None
1 2 3
Contents of Display
Power has been turned on normally. The
battery remaining power display flashes
twice, the same number of times as the bat-
tery box LED, at intervals of 2.5 seconds.
Incorrect combination for left and right
wheels
Problem with torque sensor (while wheel-
chair is moving) *3
Motor or power circuit cable is disconnected
Problem with excessive motor current
Problem with PCB internal power supply (12 V)
No remaining battery power
Incorrect wiring connections between left
and right wheels, disconnected connector
Disconnected or shorted communication cir-
cuit
Disconnected power supply circuit on left
wheel side
Torque input exists when power supply is
turned on
Poor neutral point adjustment of torque sen-
sor
Problem with torque sensor (from point when
power is turned on)
Warning that remaining battery power is low
Warning that battery temperature is low
Warning that remaining battery power is low
(communication problem)
Battery communication problem
Excessive battery discharging
Power supply circuit disconnected
Excessive battery voltage
39

Self diagnosis function

4
Repeated
• • • •
Normal
Normal
Incorrect arrangement
Failure
Failure
Failure
Failure
Insufficient charging
Incorrect arrangement
Failure
Failure
Operation error
Incorrect arrangement
Failure
Insufficient charging
Out of guaranteed temp.
range
Insufficient charging
Failure/poor arrangement:
No problems with ability of
wheelchair to move
Insufficient charging
Failure
Inspection required *4