Printed Circuit Boards; Door Sensor; Membrane Switch - Cleveland SteamCraft V Service Manual

Page 62 CET-16 Service Manual

Printed Circuit Boards

Door Sensor

Membrane Switch

shorting to ground of CON 2 wires will not damage the steamer circuits.
However, any open or shorted wire will cause improper operation of the
steamer. See information below for details.
For moisture protection, a conformal coating covers all components and
circuits of Cleveland Range printed circuit boards. If this coating is
damaged or removed during handling or shipment, moisture may seep
under the coating causing erratic behavior of a control board. Typically,
this condition will cause no permanent damage to the control board. In
cases where moisture is the suspected cause of failure, the control board
should be removed and thoroughly dried Dry the board with a hot air
blower or in an oven set at tow temperature (180 F or less). Particular
attention should be paid to connectors and wire leads. When returning the
control board to operating condition, steps to prevent further con-
tamination should be taken. This may include additional coatings, repair of
water leaks, or correction of installation deficiencies. Use only Cleveland
Range approved material to repair conformal coatings.
The door sensor switch is mounted on the Control Board Assembly as
Figure 5-5
illustrated in . It is a proximity switch activated by a magnet
mounted inside the compartment door. The control circuitry prevents
operation of heater elements and the condenser solenoid valve while this
snitch is open (door open).
To test operation of the door safety circuits when the control panel
assembly is removed or compartment door open, a small magnet may be
used to activate the door sensor. The magnet must be positioned over the
sensor with the south magnetic pole facing the sensor. Move the magnet
slowly over the top of the panel in the area near the sensor to activate the
circuit Correct positioning of the magnet can be noted by the click sound
when a contactor or solenoid energizes.
When replacing a Control Board Assembly it may be neces
the plastic mounting block, 8-32 x 1/4" screw, and bias magnet. To avoid
change magnet polarity, do not remove the bias magnet from the plastic
block.
When testing a property installed membrane switch with an ohmmeter,
the resistance reading must be less than 70 ohms with the switch dosed,
as set by the switch vendor. The Cleveland Range circuit design operates
with dosed switch resistance of 5000 ohms or less. Before testing or
replacing a membrane switch panel, be sure that both the pins and
sockets of the switch connector at CON 1 are dean and free of con-
tamination and moisture. Refer to
Table 6-1
) for connector pin location.
Figure 5-2
and the wiring diagram (see
Printed 4/90
sary to reuse