and refill with known good distilled water), a broken or damaged water quality
sensor assembly (replace water quality sensor) or damaged electronics on the
PCB (call for a RA # and return to SciCan for PCB replacement).
Before performing diagnostic procedures verify that:
1. The reservoir is free of any debris and the water quality sensor is clean.
2. The reservoir is filled with good quality steam distilled water so that the water quality
sensor is completely submerged. If in doubt about water quality, drain the reservoir and
refill with steam distilled water containing less the 5 ppm total dissolved solids. Use water
conductivity meter (part #01-103139S).
3. The leads of the water quality sensor are securely connected to PCB terminals labeled
PROBE J4-3 and J4-4.
4. Nothing is connected to PCB terminals labeled FLOAT J4-5 and J4-6.
5. The PCB is clean and dry (both sides). Pay particular attention to terminal block J4 and
components on the upper right hand portion of the board.
Diagnostic Procedures
Always Indicates an Empty Reservoir
Using a jumper wire, short together the PROBE terminals of the PCB (J4-3 and
J4-4). Attempt to start a cycle.
1. The cycle starts. PCB is defective.
2. Message, "REFILL RESERVOIR". PCB is defective.
3. Message, "WATER QUALITY IS UNACCEPTABLE". Water quality sensor defective.
Always Indicates a Reservoir Full of Good Quality Water
Disconnect the water quality sensor leads from the PROBE terminals of the PCB
(J4-3 and J4-4). Attempt to start a cycle.
I. The cycle starts. Check PCB for a short between FLOAT terminals J4-5 and J4-6.
2. Message, "REFILL RESERVOIR". Water quality sensor defective.
3. Message, "WATER QUALITY IS UNACCEPTABLE". PCB is defective.
Always Indicates a Reservoir Full of Poor Quality Water
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