Sharp SMD2499FS Service Manual page 17

PROCEDURE
LETTER
D SENSOR
1. Make sure the Easy Wave Open (motion sensor function) is activated. When activated, the blue LED
indicator light unit turns ON when drawer door is closed.
2. Check sensor lens for foreign material.
3. Check if the control panel door is defective and sagging down lower than normal when open, which
could block the view of the sensor. Close the control panel door to ensure the control panel door is
not blocking the sensor and test again.
4. Check the connector and harness to the sensor to ensure they are secured properly and not broken.
5. Check for electrical parameters in the table below. If those conditions are met, then the display unit
is working properly.
With Sensor Unplugged
Connector pin connected to Sensor
Pin # 4 to Case
Ground
Pin # 5 to Case
Ground
Pin # 6 to Case
Ground
Pin # 7 to Case
Ground
(NOTE: If the voltage is uncertain, change display unit)
6. Check for electrical parameters in the table below. If those conditions are met, then the sensor and
display unit are working properly
With Sensor plugged in
Connector pin connected to Sensor
Pin # 4 to Case
Ground
Pin # 5 to Case
Ground
Pin # 6 to Case
Ground
Pin # 7 to Case
Ground
TEST PROCEDURES
COMPONENT TEST
EASY WAVE OPEN Activated or Not Activated
[VDC] - Approx.
1.1 - 1.5 V
1.1 - 1.5 V
1.1 - 1.5 V
EASY WAVE OPEN Activated-With object infront of sensor
[VDC] - Approx.
4.65 VDC for 2 seconds and returns back to 1.46 VDC
4.9 VDC for 2 seconds and returns back to 1.5 VDC
4.89 VDC for 2 seconds and returns back to 1.5 VDC
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SMD2499FS