Power Board; Moisture Sensor - GE DBVH512 Technical Service Manual

Moisture Sensor

The moisture-sensing circuit consists of 2 sensor
rods. They are mounted beneath the lint fi lter on the
drum side of the air duct.
Sensor
Rods
Note: The 2 sensor rods in the air duct assembly are
not replaceable. To replace the sensor rods, replace
the air duct assembly. (See Air Duct Assembly.)
• The sensor rods are connected to the
main control board. The rods are spaced
approximately ½-in. apart, which creates an
open circuit to the control.
• The control board utilizes a low-voltage
capacitor that charges to approximately 5 VDC
when the circuit is open and discharges to less
than 1 VDC when the circuit is shorted.
• When wet clothes tumble across the two
rods, the clothes create a very low resistance
between the rods, which discharges the
capacitor.
• As the clothes become dry, their resistance
value increases and the charge across the
capacitor builds to approximately 5 VDC.
• Proper leveling of the dryer is vital for accurate
sensor drying. If the front of the dryer is raised
too high, clothes will tumble toward the rear of
the drum, preventing contact with the sensor
rods. This could produce a false dryness reading.

Power Board

The power board is mounted in a plastic housing
that is attached to a bracket located under the top
panel.
To remove the power board:
1. Remove the top panel. (See Top Panel.)
2. Remove the ribbon connector from power board
connection CN110.
3. Remove the wire harness from the power board
connections CN100, CN101, and CN111.
4. Remove the blue wire from power board
connection TB100, and the 2 black wires from
TB101.
5. On electric models, remove the single black wire
from power board connection TB102, and the
white wire from TB103.
6. Remove the 2 Phillips-head screws that attach
the power board to the power board support.
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