Component Testing; Touch Panel Continuity - Whirlpool MH6140XKQ/B Manual

Before testing any of the components, perform
the following checks:
• Disconnect the power supply cord from the
outlet before removing the outer cabinet
from the unit.
• Discharge the high voltage capacitor and
remove the wires from the primary winding of
the high voltage transformer before conduct-
ing any of the high voltage component tests.
WARNING
ELECTRICAL SHOCK HAZARD
Disconnect power before servicing.
Replace all panels before operating.
Failure to do so could result in death or
electrical shock.
To test the touch panel, perform the following
steps:
1. Disconnect the electrical power to the
microwave oven.
2. Disconnect the ribbon cable from the con-
trol board connector.
Flex Circuit Connector

COMPONENT TESTING

TOUCH PANEL CONTINUITY

MH6140XK/6141XK
• Perform a microwave energy test after com-
pleting any repairs to the microwave.
• Make sure that all wires are properly con-
nected before operating the microwave oven.
• Grasp the wires by their connectors when
removing them from the microwave compo-
nent terminals.
3. Set the ohmmeter to the R x 100 scale.
4. Use a pair of alligator clips and clip them to
the ribbon contact numbers shown along
the top and side of the indicated keyboard
matrix, shown below.
For example:
a) Install alligator clips over contacts 5 and
8 of the ribbon cable.
b) Touch the alligator clips with the test
leads.
c) Press the Cook Time keypad. The
meter should indicate a resistance of
less than 1000 Ω.
IMPORTANT: Make sure that the alligator clips
make positive contact with the contact areas
on the ribbon cable.
4-1
MHE14XK