Mitsubishi Electronics JT-SB216DS-W-AUS manual Resistance at two places between each pair

Error mode display		Cause	Check procedure and action to take
		4.Power switch	• Unplug the relay connector, and measure the
LED1	LED2
			resistance at two places between each pair of the
Power	Inspection
			power switch's "brown" and "blue" lead wires.
●	●

(No display, no operation)

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

	* 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.
6.Control circuit	• Replace the control circuit if other than above.
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