V-ZUG Miwell V4000 (CM4T-24025) Manual

WIRING DIAGRAM

*Note: The manual may update without prior notice. Please download the latest version of original files in this manual

INSTALLATIONS

BEFORE YOU BEGIN, READ THE FOLLOWING INSTRUCTIONS COMPLETELY AND CAREFULLY.

INSTALLING

1. Empty the microwave oven and clean inside it with a soft, damp cloth. Check for damage such as misaligned door, damage around the door or dents inside the cavity or on the exterior.
2. Put the oven on a counter, table, or shelf that is strong enough to hold the oven with the food and utensils you put in it. (The control panel side of the oven is the heavy side. Use care when handling.)
3. Do not block the vent and the air intake openings. Blocking vent or air intake openings can cause damage to the oven and poor cooking results. Make sure the microwave oven legs are in place to ensure proper air flow.
4. The oven should not be installed in any area where heat and steam are generated, because they may damage the electronic or mechanical parts of the unit.
5. Use microwave oven in an ambient temperature less than 104°F(40°C).

Note: The figure above is shown as a sample, for specific model please refer to the instruction manual.

SERVICE INFORMATION

TOOLS AND MEASURING INSTRUMENTS
NECESSARY TOOLS
Tools normally used for TV servicing are sufficient.
Standard tools are listed below.

• Diagonal pliers
• Long nose pliers
• Phillips screwdriver
• Flat blade screwdriver
• Wrench (size 5mm)
• Nut driver (size 5mm)
• Adjustable wrench
• Soldering iron
• Solder
• Vinyl insulation tape
• Polishing cloth

NECESSARY MEASURING INSTRUMENTS

• TESTER(VOLTS-DC, AC., Ohmmeter)
• Microwave survey meter
  • Holaday HI-1500 HI-1501
  • Narda 8100
    8200
• Inch scale
• 600 cc non conductive material beaker (glass or plastic), inside diameter: approx. 8.5 cm (3¹/2 in.)
• Cylindrical and made of borosilicate glass vessel.
  max. thickness: 3 mm
  outside diameter: approx. 190mm
  height: approx. 90mm
• Glass thermometer: 100°C or 212°F (1 deg scale)

• Be sure to check microwave leakage prior to servicing the oven if the oven is operative prior to servicing.
• The service personnel should inform the manufacture importer, or assembler of any certified oven unit found to have a microwave emission level in excess of 5 mW/cm² and should repair any unit found to have excessive emission levels at no cost to the owner and should ascertain the cause of the excessive leakage. The service personnel should instruct the owner not to use the unit until the oven has been brought into compliance.
• If the oven operates with the door open, the service personnel should:
  • Tell the user not to operate the oven.
  • Contact the manufacturer.
• The service personnel should check all surface and vent openings for microwave leakage.
• Check for microwave leakage after every servicing. The power density of the microwave radiation leakage emitted by the microwave oven should not exceed 4 mW/cm². Always start measuring of an unknown field to assure safety for operating personnel from radiation leakage.

MEASURING MICROWAVE ENERGY LEAKAGE

• Pour 275±15cc of 20±5°C(68±9°F) water in a glass container which is graduated to 600 cc, and place the container on the center of the turntable.
• Set the energy leakage monitor to 2450 MHz and use it following the manufacturer's recommended test procedure to assure correct result.
• When measuring the leakage, always use the 2- inch (5cm) spacer supplied with the probe.
• Operate the oven at its maximum output.
• Measure the microwave radiation using and electromagnetic radiation monitor by holding the probe perpendicular to the surface being measured
  Move probe along shaded area
  Probe scanning speed
  Less than 2.5 cm/sec
  (1 inch/sec)
  

MEASUREMENT WITH OUTER CASE REMOVED

• When you replace the magnetron, measure for microwave energy leakage before the outer case is installed and after all necessary components are replaced or adjusted.
  Special care should be taken in measuring the following parts. (Circled area of below Fig.)
  • Around the magnetron
  • The waveguide

AVOID CONTACTING ANY HIGH VOLTAGE PARTS

MEASUREMENT WITH A FULLY ASSEMBLED OVEN

• After all components, including the outer case, are fully assembled, measure for microwave energy leakage around the door viewing window, the exhaust opening, and air inlet openings.
• Microwave energy leakage must not exceed the values prescribed below.

NOTE: Leakage with the outer case removed less than 5 mW/cm 2. Leakage for a fully assembled oven (Before the latch switch (primary) is interrupted) with the door in a slightly opened position-less than 2 mW/cm ^{. 2}

NOTES WHEN MEASURING

• Do not exceed meter full scale deflection.
• The test probe must be moved no faster than 1 inch/sec (2.5 cm/sec) along the shaded area, otherwise a false reading may result.
• The test probe must be held with the grip portion of the handle.
  A false reading may result if the operator's hand is between the handle and the probe.
• When testing near a corner of the door, keep the probe perpendicular to the surface making sure the probe horizontally along the oven surface, this may possibly cause probe damage.

RECORD KEEPING AND NOTIFICATION AFTER MEASUREMENT

DISASSEMBLY AND ADJUSTMENT

1. OUTER COVER REMOVAL
   
   1. Loose screws on top and take out the top outer cover.
   2. Turn to the backside, loose screws and take out the back one.
   3. Loose screws on both sides, then take out the left and right one in turn.

1. Open the door to 90^°, lift up the hinge lock and put it down.
2. Close the door to 30°, lift up the whole door assembly slightly and take it out.
3. Disconnect the wires connected to the PCB.
4. Loose the screws fixed on the bracket.
5. Take out the control panel assembly.

3. FAN ASSEMBLY REMOVAL
   
   1. Loose screws and take out the wind guide cover.
   2. Then remove the fan.

4. ELECTRICAL PARTS REMOVAL
   1. Loose screws and remove the H.V. transformer.
   2. Then the magnetron. Also take out the thermostat and its bracket on top.
   3. Remove the metal bracket next to the magnetron.
   4. Release the capacitor bracket. Take out the capacitor and remove the H.V. diode.
   5. Loose screws and remove the motor.
      
   6. Loose screw fixed on the filter bracket. Then take out the filter.
   7. Remove the interlock assembly on both sides.
      

5. TOP INSULATED PLATE REMOVAL
   
   1. Remove the LED bulb first.
   2. Then loose screws and take out the top insulated plate.
   3. Take out the metal cover.

6. CONVECTION ASSEMBLY REMOVAL
   
   1. Loose screws and take out the heater cover.
   2. Then take out the heater inside.
   3. Loose the nut and take out the convection fan.

7. POWER BOARD REMOVAL
   
   1. Turn around the whole unit.
   2. Loose screws and take out the convection motor.
   3. Disconnect the wires leading to the power board.
   4. Loose screws and remove the power board and its bracket.

8. BOTTOM PLATE REMOVAL
   
   1. Take out the hanging brackets on both sides
   2. Turn over the whole unit.
   3. Loose screws fixed between bottom plate and backside insulated plate.
   4. Remove the insulated plate.
   5. Loose the other screws on bottom plate. Then take it out.
   6. Also take out the defrosting pan below.

9. HEATERS AND STIRRIER ASSEMBLY REMOVAL
   
   1. Loose screws inside the cavity and nuts on backside. Then take out the top heater.
   2. The bottom heater is the next one.
   3. Loose screws fixed on the splash cover and remove it.
   4. Take out the stirrer assembly and disassemble it.

DOOR ASSEMBLY

1. Remove the door gasket and seal ring
   
2. Remove the door frame and remove the hinge
   
3. Take out the insulation glass, loose screws and remove the handle assembly
   

CONTROL PANEL DISASSEMBLY

4. Disconnect the wires and remove the power PCB
5. Remove screws holding operating panel cover
6. Remove control PCB and other electrical components

PRIMARY INTERLOCK SWITCH TEST
When the door release button is depressed slowly with the door closed, an audible click should be heard at the same time or successively at intervals. When the button is released slowly, the latches should activate the switches with an audible click. If the latches do not activate the switches when the door is closed, the switches should be adjusted in accordance with the adjustment procedure. Disconnect the wire from the primary switch. Connect the ohmmeter to the common (COM) and normally open (NO) terminal of the switch. The meter should indicate an open circuit in the door open condition. When the door is closed, the meter should indicate a closed circuit. When the primary switch operation is abnormal, make the necessary adjustment or replace the switch with the correct spare part.

SECONDARY INTERLOCK SWITCH TEST
Disconnect the wire from the secondary switch. Connect the ohmmeter to the common (COM) and normally open (NO) terminals of the switch. The meter should indicate an open circuit in the door open condition. When the door is closed, ohmmeter should indicate a closed circuit. When the secondary switch operation is abnormal, make the necessary adjustment or replace the switch with the correct spare part.

MONITOR SWITCH TEST
Disconnect the wire from the monitor switch. Connect the ohmmeter to the common (COM) and normally closed (NC) terminals of the switch. The ohmmeter should indicate closed circuit in the door open condition. When the door is closed, meter should indicate an open circuit. When the monitor switch operation is abnormal, replace with the correct spare part.
NOTE: After repairing the door or the interlock system, it is necessary to repeat the interlock switch tests before operating the appliance.

COMPONENTS	TEST PROCEDURE		RESULTS
SWITCHES (Wires disconnected)	Check for continuity of the switch with an Ohm-meter		Door open	Door closed
	Primary Switch Type No. KW3A
	Monitor Switch Type No. KW3A
	Secondary Switch Type No. KW3A
	NOTE: After checking for the continuity of switches, make sure that are correctly connected.

COMPONENT TEST PROCEDURE

COMPONENTS	TEST PROCEDURE	RESULTS
HIGH VOLTAGE TRANSFORMER (Wires disconnected)	Measure the resistance. (Ohm-meter scale: Rx1) Primary winding Secondary winding Filament winding Measure the resistance. (Ohm-meter scale: Rx1000) Primary winding to ground Filament winding to ground	Approx.: 1.4 ohm Approx.: 90 ohm Less than: 1 ohm Normal: Infinite Normal: Infinite
MAGNETRON (Wires disconnected)	Measure the resistance. (Ohm-meter scale: Rx1) Filament terminal Measure the resistance. (Ohm-meter scale: Rx1000) Filament to chassis	Normal: Less than 1 ohm Normal: Infinite
	NOTE: When testing the magnetron, be sure to install the magnetron gasket in the correct position and be sure that the gasket is in good condition.
HIGH VOLTAGE CAPACITOR	Measure the resistance. (Ohmmeter scale: Rx1000) Terminal to terminal.	Normal: Momentarily indicates several ohms, and then gradually returns to 10M ohms.
	Measure the resistance. (Ohmmeter scale: Rx1000) Terminal to case.	Normal: ∞
HIGH VOLTAGE DIODE *NOTE: Some inexpensive meters may indicate infinite resistance in both directions.	Measure the continuity (Forward). (Ohm-meter scale: Rx10000)	Normal: Continuity. Abnormal: ∞ *
	Measure the continuity (Reverse). (Ohm-meter scale: Rx10000)	Normal: ∞ Abnormal: Continuity.

COMPONENTS	TEST PROCEDURE	RESULTS
FUSE	Check for continuity of the fuse with a multi-meter.	Normal	Abnormal
	NOTE: If the fuse is blown, check the primary, the secondary, and the monitor switches, H.V.D. and H.V.C. before replacing the fuse. If the fuse is blown by improper switch operation replace the defective switch and the fuse at the same time. Replace just the fuse if the switches operate correctly.
HEATER ELEMENT (Wires disconnected)	Measure the resistance. (Multi-meter scale: Rx1)	Normal: *Grill heater Approx. 38 ohm (at 20 ~ 30°C)
	Measure the resistance with 500V-100M ohm insulation resistance meter.	Normal: more than 0.5 Mohm
	NOTE: Make sure heater is fully cooled when tested.
THERMAL CUT-OUT		Below specified temperature	Above specified temperature

COMPONENTS	TEST PROCEDURE	RESULTS
L.V.Transformer of PCB (Refer to schematic diagram)	Check for PCB connector. *Disconnect the 3-pin connector from P.C.B.	Normal	Abnormal
RELAY 2, RELAY 3 OF P.C.B. (Wires disconnected) Note: Relay Relay 1: Fan motor Turntable motor Oven lamp Relay 2: Microwave Relay 3: Grill		Cooking start	OFF
FAN MOTOR (Wires disconnected)	Measure the resistance. (Ohm-meter scale: R x 1)	Normal: 100~500 Ω Abnormal: ∞ or several Ω
TURNTABLE MOTOR (Wires disconnected)	Measure the resistance. (Ohm-meter scale: R x 1000)	Normal: Approx.100~200KΩ Abnormal: ∞ or several Ω
NOTE: A MICROWAVE LEAKAGE TEST MUST ALWAYS BE PERFORMED WHEN THE UNIT IS SERVICED FOR ANY REASON. MAKE SURE THE WIRES ARE IN THE CORRECT POSITION. WHEN DISCONNECTING WIRES FROM PARTS, BE SURE TO GRASP THE CONNECTOR, NOT THE WIRES.

TROUBLE SHOOTING

WHEN RECEIVING A COMPLAINT FROM A CUSTOMER, EVALUATE THE COMPLAINT CAREFULLY. IF THE FOLLOWING SYMPTOMS APPLY, PLEASE INSTRUCT THE CUSTOMER IN THE PROPER USE OF THE MICROWAVE OVEN. THIS CAN ELIMINATE UNNECESSARY SERVICE CALLS.

The appliance does not function at all; there are no symbols/numerals on the display and no input are accepted.

Oven does not start

EXPLODED VIEW & SPARE PARTS

ADDITIONAL INFORMATION FOR SERVICE*

More information for appliance service
Settings - Service menu
Enter the service menu with Code "6301"
Service menu
Service menu	Display calibration	The display area can be moved by ±4 pixel in vertical and horizontal direction
Service menu	Mains connection check (only in Steamer)	Only for regulation authority
Service menu	Installation check (Only in Fixed Water Steamer)	Function to check the fixed water connection of appliance
Service menu	Empty the water system (Only in Fixed Water Steamer)	Empty the water system.
Service menu	Demo mode	Activate / Deactivate the Demo mode
Service menu	Operating data	Display total operating hours

* Note: The manual may update without prior notice. Please download the latest version of original files of this manual, spare part information

• Remove your watches whenever working close to or replacing the Magnetron.
• NEVER operate the oven with no load.
• NEVER injure the door seal and front plate of the oven cavity.
• NEVER put iron tools on the magnetron.
• NEVER put anything into the latch hole and the interlock switches area.

MICROWAVE RADIATION
Personnel should not be exposed to the microwave energy which may radiate from the magnetron or other microwave generating device if it is improperly used or connected.
All input and output microwave connections, waveguide, flange and gasket must be secured. Never operate the device without a microwave energy absorbing load.
Never look into an open waveguide or antenna while the device is energized.

THE OVEN IS TO BE SERVICED ONLY BY PROPERLY QUALIFIED SERVICE PERSONNEL.