MW24 Microwave Oven Wiring Diagrams and Schematics
This document provides detailed wiring diagrams and schematics for the MW24 Microwave Oven, specifically for models manufactured prior to Serial Number 1200154.
MW24 Pictoral Wire Diagram
Note: Prior to Serial Number 1200154
This diagram illustrates the physical wiring layout.
The POWER SUPPLY CORD (120V 60Hz) connects via CN-F (BLK 2, RED 3, WHT 1) and CN-C to the CONTROL PANEL (LSI UNIT). It also connects to the POWER UNIT.
The CONTROL PANEL (LSI UNIT) is connected to the DOOR SENSING SWITCH (COM, N.O., PNK, GRN).
The POWER UNIT contains components like RY2 (PRIMARY INTERLOCK RELAY), CN-A, CN-B, OVEN LAMP AND SOCKET (ORG, BLU), FAN MOTOR, MAGNETRON, HIGH VOLTAGE COMPONENTS, TURNTABLE MOTOR, MONITOR SWITCH, MONITOR FUSE & HOLDER, and SECONDARY INTERLOCK SWITCH.
Connections to the Oven cavity are made with GRN wires.
Notes:
- The grounding conductor of the power supply cord has been grounded by the power supply cord fixing screw. This screw must always be kept tight.
- The neutral (WHT/GRY) wire must be connected to the terminal with the "N" mark on the power supply cord.
- The hot (ORG) wire must be connected to the terminal with a blue mark on the oven light socket.
Key Components Identified:
- AH SENSOR
- CAVITY TEMP. FUSE
- MAGNETRON TEMP. FUSE
- HIGH VOLTAGE CAPACITOR
- POWER TRANSFORMER
- H.V. RECTIFIER
MW24 Wire Schematic
Note: Prior to Serial Number 1200154
This schematic provides a functional overview of the wiring.
Power Input: 120V AC 60 Hz connects to the CONTROL UNIT.
The CONTROL UNIT interfaces with:
- F1, F2, F3 (Fuses)
- RY-1, RY-2 (Relays, e.g., PRIMARY INTERLOCK RELAY)
- AH SENSOR
- CAVITY TEMP. FUSE
- MAGNETRON TEMP. FUSE
- DOOR SENSING SWITCH (N.C., COM.)
- SECONDARY INTERLOCK SWITCH (N.O., COM.)
- OVEN LAMP
- TURNTABLE MOTOR (TTM)
- FAN MOTOR (FM)
- CAPACITOR (1.0µF AC 2300V)
- POWER TRANSFORMER
- H.V. RECTIFIER
- MAGNETRON
Note: Indicates components with potential above 250 Volts.
MW24 Power Unit Circuit
Note: Prior to Serial Number 1200154
This section details the circuit design of the power unit.
The circuit includes a power transformer (T1), high voltage rectifier (D1-D4, D5, D6, D7, D8), a high voltage capacitor (C4: 10µF/35V), and a magnetron.
Control signals are managed by relays (RY1, RY2) and transistors (Q1, Q2, Q3).
Other components include resistors (R1, R2, R3, R4, R5, R6, R27, R510), diodes (ZD1), a buzzer (SP1 PKM22EPT), LEDs (C10), and various capacitors (C1, C2, C3, C5, C10, C11).
Connectors include CN-A (J1), CN-C (12PIN LEAD WIRE HARNESS), CN-B, and CN-D.
The circuit manages power distribution to the oven lamp, turntable motor, and fan motor.
MW24 LSI (Large Scale Integration) Unit Circuit
Note: Prior to Serial Number 1200154
This section outlines the circuit for the LSI (Large Scale Integration) control unit.
The core of this unit is the IXA098DR IC (IC-1), a complex integrated circuit likely handling user interface, cooking logic, and motor control.
It connects to various input/output pins:
- Analog Inputs (AIN0-AIN7): For sensors like AH SENSOR, temperature sensors, and potentially others.
- Segment Pins (SEG0-SEG67): For driving a display, likely segmented LEDs or VFD.
- Common Pins (COM0-COM15): Used in conjunction with segment pins for display multiplexing.
- Control Pins: Including RESET, VCC, VSS, OSCSEL, XCOUT, XCIN, XOUT, XIN, INT0, CNTRO, VLIN, VREG, VL1-VL5.
- Keypad Inputs: G1-G14 representing buttons for various cooking functions (BEVERAGE, FRESH VEGETABLES, RICE, GROUND MEAT, POULTRY, FISH, FROZEN VEGETABLES, FROZEN SEAFOOD, ENTREES, BREAKFAST, SNACKS, LUNCH, DINNER, BAKED POTATOES, POPCORN, SENSOR REHEAT, DEFROST, TIMER/CLOCK, POWER LEVEL, QUICK ON/START, TIMER/CLOCK, STOP/CLEAR, HELP, MINUTE, ADD WARM).
The unit also includes other ICs (IC-2 BA4558), transistors (Q10, Q11, Q20, Q21, Q30), diodes (D90, D20), resistors, capacitors, LEDs (LD11, LD13, LD15), and a buzzer.
Connectors include CN-C, CN-G, and CN-F.
MW24 PC Board of Power Unit
Note: Prior to Serial Number 1200154
This section describes the physical layout of the Power Unit's Printed Circuit Board (PC Board).
Key components mounted on the board include:
- RY2
- Capacitors: C1, C2, C3, C4, C5
- Resistors: R1, R2, R3, R4, R5, R6, R27, R510
- Transistors: Q1, Q2, Q3
- Diodes: D1, D2, D3, D4, D5, D6, D7, D8, D9, D10, ZD1, VRS1
- Relays: RY1, RY3
- Transformer: T1
- Buzzer: SP1
- Other components: VRB, DU, OMIF, VH, F
Connectors present on the board are CN-C, CN-B, CN-A (J1), CN-D, SH-B, SH-A, and AC.
