KitchenAid KHMS105E service manual Control Circuit Board Check List, Voltage circuits

Page 66

COMPONENT

TEST PROCEDURE

RESULT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Relay 2

Set the ohmmeter to the R x 1

 

 

 

 

 

 

 

WARNING: When you apply

scale, and check

for continuity

 

 

 

 

 

 

 

between the two

relay terminal

 

 

 

 

 

 

 

power to the unit, be careful

 

 

 

 

 

 

 

pins. Use the following steps.

 

 

 

 

 

 

 

not to touch any of the high

 

 

 

 

 

 

 

1.Remove the wire connectors

 

 

 

 

 

 

 

voltage circuits.

 

 

 

 

 

 

 

 

from the relay terminals.

 

 

 

 

 

 

 

 

2.Use a pair of alligator clips,

 

 

 

 

 

 

 

 

and clip the ohmmeter leads

 

 

 

 

 

 

 

 

to the two terminals of the re-

 

 

 

 

 

 

 

 

lay. Make sure that you do not

 

 

 

 

 

 

 

 

allow the clips to short to any-

 

 

 

 

 

 

 

 

thing.

 

 

 

 

 

 

 

 

 

3.Plug the microwave oven into

 

 

 

 

 

 

 

 

an AC receptical.

 

 

 

 

 

 

 

 

 

∞

0

 

∞

0

 

 

4.Set the power level, as shown

 

 

 

 

in the chart in the right col-

 

 

 

 

 

 

 

 

umn, and check the relay op-

 

 

 

 

 

 

 

 

eration for the ten power lev-

 

 

 

 

 

 

 

 

els. NOTE: During the operat-

 

CLOSED

OPEN

 

ing time set for each level, the

 

 

 

 

 

 

 

 

relay will close (short) for the

 

 

 

 

 

 

 

 

time specified in the chart, and

 

 

 

 

 

 

 

 

then open for another speci-

 

 

 

 

 

 

 

 

fied amount of time. When the

 

 

 

 

 

 

 

 

open time elapses, the cycle

 

 

 

 

 

 

 

 

begins again until the cooking

 

 

 

 

 

 

 

 

time elapses and the oven

 

 

 

 

 

 

 

 

turns off.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CONTROL CIRCUIT BOARD CHECK LIST

The following problems indicate a defective control circuit board:

1.The START function fails to operate, but the high voltage systems, the interlock switches, the door sensing, and the relay checks are good.

2.The oven operates okay with a replace- ment relay installed.

3.Proper temperature measurements can- not be obtained.

4.The buzzer does not sound, or continues to sound.

5.Some segments of one or more digits do not light up, or they continue to light up, or segments light when they should not.

6.Wrong figures appear on the display.

7.The digits on the display flicker.

8.Some of the indicators do not light.

9.The clock does not keep the proper time.

3-24

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Page 65 Page 67
Contents Microwave Oven Hood Combination KHMS105E KHMC107E Table of Contents Convection Thermistor Convection Heating Element Important Safety Information Electrical Shock HazardPage Vii Leakage Test EquipmentTest Theory of Operation Relay #4 Capacitor Bkbl Blower Motor High Component Access Component SectionsGeneral Removing the Microwave Oven & CabinetBase Plate Screws Cooktop Light Assembly Wiring Protection Control System Removing the Oven DoorRemoving the Door Choke Removing the Control Panel Removing the Line Fuse REMOVING/ADJUSTING the Interlock Switches Removing a SwitchInset SecondaryMaking Adjustments Removing the Base Thermal Fuse Removing the Magnetron Thermal Fuse Removing the Cavity Thermal Fuse Removing the Convection Thermistor White Wires Operating Control System Removing the Oven Light SocketRemoving the Control Circuit Board Turn Board OverRemoving the Temperature Probe Socket Removing the FAN Motor Removing the Power Cord Removing the Blower Motor Capacitor Removing the Convection Heating Element Viewed from Under TOP Plate Removing the GAS Sensor Removing the Synchronous Motor Removing a Cooktop Light Socket High Voltage Components Accessing the High Voltage Components Removing the Magnetron Removing the High Voltage Rectifier High Voltage Capacitor Replacing The High Voltage RectifierHigh Voltage Rectifier Mounting Flange Removing the High Voltage Transformer Component Description & Testing Important Safety InstructionsPage Original 03/97 Thermal Fuses Possible Customer ComplaintBlower Motor Capacitor GAS Sensor Convection Thermistor Convection Heating Element Viewed from Under TOP PlateMotors Programming Checks Touch Panel Continuity TestCombination Bake Temperature ProbeThings to Know Combination RoastCharts Problem Possible Cause Test Procedure Or CorrectionProblem Possible Cause Test Procedure Or Correction Problem Possible Cause Test Procedure Or Correction Checking the Microwave Power Output Checking for Microwave Energy Leakage Measuring The Oven With The Cabinet Installed Making the MeasurementsPage Component Testing Test ChartsTerminal-To-Terminal Contacts Component Test Procedure Result Keyboard Matrix Control Circuit Board Check List Voltage circuitsDoor Open PRIMARY, MONITOR, & Secondary Switch Checkout ProcedureContinuity Test Chart Door Closed
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KHMS105E specifications

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