Daewoo KOR-6C0B5S - User Manual

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Overview

This document is a service manual for a Daewoo Microwave Oven, model KOR-6C0B5S, published in February 2003. It provides comprehensive information for servicing and understanding the device.

The microwave oven is designed for counter-top use only. It operates on a 230V-50Hz single-phase power supply with earthing, consuming 1200W of power. Its microwave energy output is 800W, and it operates at a microwave frequency of 2450MHz. The external dimensions are 465 x 279 x 365 mm (18.3 x 11.0 x 14.4 in), with a cavity measuring 290 x 220 x 306 mm (11.4 x 8.7 x 12.0 in). The net weight is approximately 12.7 kg (27.9 lbs.). The timer can be set for up to 59 minutes and 90 seconds. It offers "MICROWAVE" as a function selection and provides 10 power levels. The cavity volume is 0.7 Cu. Ft.

The manual begins with crucial safety precautions for both operation and servicing. For safe operation, it warns against operating the oven with a broken door hinge, viewing screen, front panel, oven cavity, or a loosened/broken door lock. It emphasizes keeping the door gasket plate and oven cavity clean and not attempting to operate the appliance with the door open or to defeat the concealed switches. For safe service procedures, it mandates a microwave emission check before servicing, especially if the oven is operative or found to be leaking. Any defective interlock, monitor, door seal, or microwave generation/transmission systems must be repaired or replaced according to the manual's procedures. A microwave leakage check is required on each oven before release to the owner.

The external view of the oven highlights several key features:

Door Seal: Maintains microwave energy within the oven cavity and prevents leakage.
Door Hook: Locks the door when closed; stops the magnetron if opened during operation.
Door Screen: Allows viewing of food while blocking microwaves.
Spatter Shield: Protects the microwave outlet from food splashes.
Oven Lamp: Illuminates automatically during operation.
Safety Interlock System: A critical safety mechanism.
Control Panel: The user interface.
Glass Cooking Tray: Made of heat-resistant glass, must be in place during operation.
Oven Front Plate: Part of the oven's exterior.
Roller Guide: Supports the glass cooking tray.

The control panel features:

Display: Shows cooking time, power level, indicators, and current time.
Power: Sets the power level.
Defrost: Defrosts food by time.
Clock: Sets the clock.
Up: Adds time to cooking.
Down: Decreases time from cooking.
Auto Cook: Cooks or reheats favorite foods.
One Touch Cook: Cooks or reheats specific quantities of food.
Time Set Pad: Sets cooking time and current time.
Stop/Clear: Stops oven operation or deletes cooking data.
Start/Speedy Cook: Starts the oven and sets reheat time.

The wattage output chart details the power levels: P-HI (100%), P-90 (90%), P-80 (80%), P-70 (70%), P-60 (60%), P-50 (50%), P-40 (40%), P-30 (30%), P-20 (20%), P-10 (10%), and P-00 (0%).

Installation guidelines emphasize a steady, flat counter-top location, adequate clearance for air vents, and distance from radios, TVs, heating appliances, and water taps. The power supply requires approximately 6 amperes, 230 Volts, 50 Hz, with a 0.8-meter cord. It warns against using higher voltages and specifies that the cable, if damaged, must be replaced by a qualified person using a DAEWOO-supplied cable. Earthing instructions are provided, stressing the importance of a properly earthed 3-wire extension cord if needed.

Disassembly and assembly procedures are detailed with cautions regarding high-voltage, high-current components. Technicians are advised to always remove the power plug, use insulated tools, discharge the high voltage capacitor, and check grounding. Specific steps are provided for removing the cabinet, door assembly, door parts, and control panel parts. Methods to reduce gaps between the door seal and oven front surface are also described. Removal instructions for high voltage capacitor, magnetron, wind guide assembly, and H.V. transformer are included, with warnings about microwave leakage and high potential parts.

The interlock mechanism and adjustment section explains how the primary and secondary interlock switches, along with the interlock monitor switch, ensure safety by cutting power when the door is opened. Adjustment steps for these switches are provided, emphasizing that a microwave emission test must be performed after adjustment.

The troubleshooting guide covers various scenarios:

Oven does not operate at all: Checks fuse, interlock monitor switch, primary and secondary interlock switches, and primary winding of the low voltage transformer.
Display shows figures, but oven does not start cooking: Checks primary and secondary interlock switches, and D.C. voltage to RELAY (RY2) coil.
No microwave oscillation even though fan motor rotates: Checks high voltage fuse, high voltage capacitor terminals, high voltage rectifier, magnetron, primary and secondary coil of high voltage transformer, filament terminal of high voltage transformer, and D.C. voltage to RELAY (RY1) coil.
Defective touch control circuit or membrane switch assembly: Addresses incomplete segments, flickering digits, incorrect display, non-responsive buttons, and issues with time counting.

Measurement and test procedures include:

Microwave Power Output Measurement: Involves heating 1000±5cc of potable water in a borosilicate glass vessel, measuring temperature rise, and calculating power output using the formula P=4187 X AT/t.
Microwave Radiation Test: Requires a Microwave Energy Survey Meter to ensure leakage does not exceed 4mW/cm², with specific instructions for probe placement and movement.
Component Test Procedure: Details checks for high voltage transformer (secondary, filament, primary windings), high voltage capacitor (continuity, shorts, opens), high voltage diode (forward/backward resistance), magnetron (filament continuity, resistance to case), and fuse.

The wiring diagram and printed circuit board (PCB) information are also provided. The PCB circuit diagram shows the layout of components, and a circuit check procedure includes low voltage transformer checks and voltage checks at key points (IC1 PIN 14, IC1 PIN 22, IC1 PIN 1 OR 2). Troubleshooting steps related to microwave oscillation and digital clock operation are linked to specific points on the circuit diagram.

The exploded view and parts list provide a detailed breakdown of the oven's components, including door assembly, control panel assembly, and total assembly, with part codes, names, descriptions, and quantities.

Overall, this manual serves as a critical resource for technicians, ensuring safe and effective servicing of the Daewoo KOR-6C0B5S microwave oven.