Mitsubishi Electric JT-SB216DS-W-AUS Handbook page 9

Error mode display
LED1 LED2
Power Inspection
● ●
(No display, no operation)
LED1 LED2
Power Inspection
● ●
(Operates, but no display)
LED1 LED2
Power Inspection
✩ ✩
(Heat sink overheat)
LED1 LED2
Power Inspection
✩
●
(Mischievous use
prevention timer)
Cause
4.Power switch
5.Control circuit
1.Display board
2.Control circuit
1.Filter clogged with dust
2.PTC operation (control
circuit)
3.Control circuit
1.Continuous operation
2.Stained sensor's
windows
3.Disengaged sensor
4.Displaced sensor's
board positions
5.Sensor light
emitting/receiving
diode failure
6.Control circuit
Check procedure and action to take
• Unplug the relay connector, and measure the
resistance at two places between each pair of the
power switch's "brown" and "blue" lead wires.
• Replace the control circuit if other than above.
• Is the sensor's lead wire connector (CN2) connected?
• Unplug the control circuit's CN2 (3-pin connector),
measure the voltage between pins 1 and 2 as well as
pins 1 and 3 of the CN2 by diode check (measure on
the lead wire side).
• Replace the control circuit if other than above.
• Is the filter clogged with dust and the like? → If so,
clean the filter.
• Are the temperatures of the control circuit and
electronic parts too high? → If so, turn OFF the power
switch and lower the temperatures to normal
temperatures (40 ˚C or less).
• Replace the control circuit if other than above.
• When the operation time exceeds 30 seconds, the
operation stops by the activated mischievous use
prevention timer.
• Are the sensor's three windows stained?
• Is the sensor's lead wire connector connected?
• Are the sensor's board positions displaced (top/bottom
light emitting boards, light receiving board)?
• Measure the forward voltages of the LEDs on the
top/bottom light emitting boards and the photo diode
(PHD) on the light receiving board with a measuring
device that has a diode check function.
– side
Tester
+ side
* Replace the top/bottom light emitting boards and the
light receiving board if the measured values are
other than the normal values shown in the table
above.
• Replace the control circuit if other than above.
— 9 —
Measured value Decision/action
1.5 to 1.8V Normal
Item name Measured value Decision
LED 0.9 to 1.2V
Photo diode 0.5 to 0.8V
Normal
Normal