Kleenmaid MWG4511 Manuel utilisateur
Cover Page
MICROWAVE OVEN
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE UNIT，READ THE SAFETY PRECAUTIONS IN THIS
MANUAL.
REPAIR INSTRUCTION
1SAFETY·································································2
1.1 Danger ·················································································2
1.2 Caution!················································································2
1.3 Leak test (leak detection measurement) ·······························3
COMPONENTS···················································4
High-voltage diode ·····························································4
High-voltage capacitor························································5
High-voltage transformer ····················································6
Magnetron··········································································7
Safety switches ··································································8
REPAIR ·······························································9
Removing ························································10
Removing
Removing ···································· 10
Removing ·················································· 10
Removing ······························· 11
Removing Orifice Assembly ··············································· 11
FAULT DIAGNOSTICS······································· 14
Troubleshooting plan - when getting a complaint··············· 14
Troubleshooting plan - ··· 16
Troubleshooting plan - oven does not operate at all···········
Troubleshooting plan - ··········· 1
Troubleshooting plan - output power is low························· 20
··········· 2
Page 1
2
2.1
2.2
2.3
2.4
2.5
3
3.3
3.4
3.5
3.6
3.7
3.8
4
4.1
4.2
4.3
4.4
4.5
4.6
Outer Case
Power Supply Cord ······························· 10
··········
Control Panel Assembly
Door Assembly
High-voltage Transformer
probable defective control circuit
oven does not start cooking
Troubleshooting plan - oven does not cook properly
Removing ···················3.9 High-voltage Capacitor and Diode 11
Removing 3.10 Air guide Assembly··········································· 11
Removing ··············································· 123.11 Magnetron ···
··
·
··
Removing 3.12 Pcb Assembly··················································· 12
Removing ······························· 13.13 Turntable Motor ·········
·····
··
Removing Trim Assembly 3.1
Removing under Air guide3.2
··················································9
················································9 ·
3
9
1
18
··········· 24.7 Troubleshooting plan - grill ···········
······················
···· 2
1 SAFETY
1.1 Danger
Repairs may be carried out by an electrician only!
Improper repairs may endanger and injure the user!
To prevent electric shocks, always comply with the following
information:
• Do not touch the housing and frame if the appliance is faulty,
• Do not touch any modules in the appliance, even modules can be
live!
• Before commencing repairs, always disconnect the appliance from
the power supply!
• If tests have to be performed while the appliance is live, always
use a residual-current-operated circuit-breaker!
• The protective conductor connection must not exceed the standard
values! This connection is extremely important for personal safety
and function of the appliance!
• When repairs are complete, conduct a test in accordance with
VDE 0701 or national regulations!
• When repairs are complete, conduct a function test!
• When repairs are complete, conduct a leak rate test!
1.2 Caution!
Always comply with the following instructions to prevent damage to
the appliance or to components:
• Comply with ESD instructions!
• Never attempt repairs by randomly replacing components!
• Always proceed systematically and follow the troubleshooting
instructions!
• Do not test the high-voltage circuit while the appliance is running –
Danger of death!
• Discharge the high-voltage capacitor before testing!
•Discharge the high-voltage capacitor by shorting across the two
terminals with an insulated srewdriver when replacing or checking,
because an electric charge remains in the high-voltage capacitor for
30 seconds after the oven stops.
the housing and frame may be live!
Page 2
1.3 Leak test (leak detection measurement)1.3 Leak test (leak detection measurement)
The leak rate is the microwave energy which escapes despite the
intact sealing systems.
The leak rate is the microwave energy which escapes despite the
intact sealing systems.
The leak rate is measured as an energy density with suitable
measuring instruments at a distance of 5 cm. The unit of
measurement is mW/cm.
2
The leak rate is measured as an energy density with suitable
measuring instruments at a distance of 5 cm. The unit of
measurement i
The limiting values for the permitted measured values, as well as
the measurement conditions, have been specified in the VDE
regulation 0700/Part 25 and are as follows:
The limiting values for the permitted measured values, as well as
the measurement conditions, have been specified in the VDE
regulation 0700/Part 25 and are as follows:
1.3.1 Normal operation with load1.3.1 Normal operation with load
Setting: maximum power setting of the applianceSetting: maximum power setting of the appliance
Load: 275 cm3waterLoad: 275 cm
Permitted limiting value: 5 mW/cm2Permitted limiting value: 5 mW/cm
Measurement distance: 5 cmMeasurement distance: 5 cm
2
3water
2
1.3.2 Abnormal operation (no-load operation)
Setting: maximum power setting of the appliance
Load: none (no-load operation)
Permitted limiting value: 10 mW/cm2
Measurement distance: 5 cm
Page 3
Set to insulation resistance.
2 COMPONENTS
2.1 High-voltage diode
Blocking direction = infinite.
The high-voltage diode can be tested like a standard diode.
Use an EHG tester for this.
• Full continuity in conducting direction.
• Infinite in blocking direction.
Set to insulation resistance.
Conducting direction = full continuity.
Page 4
2.2 High-voltage capacitor
The high-voltage capacitor can be tested by ‘ohmic’ measurement’
(resistance measurement range 20 ΜΩ).
A correctly functioning capacitor indicates transient continuity.
The resistance then increases proportionally with the load.
A defective capacitor (e.g. short-circuit) indicates permanent
continuity.
The measuring instrument must indicate infinitely between the
connection and housing.
Page 5
2.3 High-voltage transformer
This transformer supplies the heater voltage for the magnetron and
the operating voltage for doubling the voltage.
• Input voltage 230 V
• Heater voltage approx. 3.3 V
• Operating voltage approx. 2300 V
The operating voltage cannot be measured!!
Heater voltage of
approx. 3.3V
Primary side 230V
of input voltage
Page 6
2.4 Magnetron
The magnetron can be tested by ‘ohmic’ measurement´ only.
The volume resistance of the terminals F and FA should be less than 1
Ω.
The insulation resistance between the two terminals and the housing
should be infinite.
Measure the resistance with an EHG tester.
Note:
An internal flashover (short-circuit between cathode and anode)
cannot usually be established by taking a measurement.
This is not indicated until the appliance is switched on when high
voltage is applied to the magnetron.
It may also be possible to detect the fault by loud humming noises.
Before installing the magnetron, ensure that the metal seal is ok and is
seated correctly.
Page 7
2.5.1 Switching sequence
2.5 Safety switches
Each door switch independently switches off the power supply for the
microwave oven when the door is opened.
Microwave ovens usually feature at least three safety switches.
The switching sequence is specified by the arrangement and is as
follows.
These switches are supported by the switch brackets.
The basic function of these switches is to interrupt microwave
generation as soon as the door is opened.
One of the three switches is the short-circuit switch. It monitors one of
the two other switches and actuates the appliance safety device if the
monitored switch does not function.
Switching
sequence
Open door Close door
1.) Safety switch on right Short-circuit switch
2.) Safety switch on left Safety switch on left
3.) Short-circuit switch Safety switch on right
In this case the appliance is disconnected from the power supply and
can no longer be switched on.
Page 8
3 REPAIR
3.1 Removing Trim Assembly
1. Open the door, remove the Screw B from the installation hole.
2. Pull the Microwave oven out.
3. Remove the screws holding the Trim Assembly to the Cavity
Caution!:Discharge the high-voltage capacitor before testing!
Page 9
Installation Hole
Screw B
Assembly.
3.2 Removing Under Air Guide
1. Remove the screws holding the under Air Guide to Cavity Assembly.
under Air Guide
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