To Next PageTo Next PageWhat to do if the monitor fuse blows in a Sharp R-1880LS?
If your Sharp Microwave Oven's monitor fuse blows, examine the secondary switch, door sensing switch, secondary interlock relay (RY2), primary switch, and monitor switch before replacing the fuse. Also, when replacing the monitor fuse, be sure to replace the monitor switch and primary switch as well.
General| Brand | Sharp |
|---|---|
| Model | R-1880LS |
| Category | Microwave Oven |
| Language | English |
Procedure to follow before commencing any service work on the oven.
Details on proper grounding procedures for electrical safety.
Step-by-step explanation of the oven's operational sequence.
State of the oven when not in use and door is closed.
Sequence of operations when cooking mode is selected and started.
Explanation of variable power level settings and their operation.
Operation sequence for convection cooking modes.
Procedure for reaching and maintaining desired preheat temperatures.
Operation of combined microwave and convection cooking modes.
How the sensor detects food moisture for automatic cooking.
Automatic cooking sequences for broiling, roasting, and baking.
Procedure for defrosting food using timed settings.
Description of the automatic fire detection system during microwave cooking.
Details on how the fire sensing feature operates.
Guide to identifying and resolving common oven problems.
Detailed steps for testing individual oven components.
Overview of the touch control panel's circuits and functions.
Description of the key unit's composition and signal flow.
Components and functions of the oven's main control unit.
Role of the LSI chip in controlling oven functions and signals.
Circuit that generates necessary voltages for the control unit.
Circuit for maintaining accurate timekeeping in the clock.
Circuit for generating a reset signal to the LSI.
Circuit responsible for audible feedback sounds.
How oven temperature is sensed and processed.
Circuit that detects food humidity for automatic cooking.
Switch that informs the LSI about the door's open/closed status.
Circuit controlling various oven components via relays.
Circuitry for the fluorescent display elements.
Method for exhausting hot air vertically through the oven's rear.
Method for exhausting hot air horizontally through the oven's rear.
Method for recirculating air horizontally through the oven's front.
Electrical schematic of the oven in the off state.
Electrical schematic of the oven during microwave cooking.
Electrical schematic for convection cooking modes.
Electrical schematic for automatic mix cooking modes.
How the oven door is opened via the control panel.
Function and interaction of door interlock switches.
Role of the monitor switch in safety and operation.
Function of the temperature fuse to protect the magnetron.
How the hood fan is controlled by temperature.
Function of the motor that rotates the turntable.
Purpose of the fan motor in cooling internal components.
Description of the hood fan motor and its operation.
Function of the motor that circulates microwave radiation.
Operation of the hood lighting system.
How the heating element provides heat for convection.
Overall system for circulating hot air for cooking.
Mechanism controlling the air damper's position.
Details on how the damper motor and switch operate.
Step-by-step guide to removing the hood exhaust louver.
Procedure for safely removing the oven unit from its wall installation.
Steps to remove the outer cabinet of the microwave oven.
Procedure for removing unit mounting screws and hood intake duct.
Detailed steps for safely removing the power transformer.
Removal procedures for multiple components in the hood/oven area.
Instructions for safely removing the magnetron assembly.
Steps for removing high voltage rectifier and capacitor components.
Procedure to remove the hood fan thermal cut-out.
Steps for removing the magnetron's temperature fuse.
Procedure for removing the cooling fan motor assembly.
Instructions for installing the fan motor and fan blade.
Steps to remove the turntable motor and its coupling.
Procedure for removing the stirrer motor.
Instructions for installing the stirrer cover and fan.
Procedure for removing the noise filter component.
Steps to remove the oven lamp and its socket.
Procedure for removing the control panel and its sub-assemblies.
How to remove the positive lock connector.
Steps to remove the convection duct assembly.
Procedure for removing the oven thermistor.
Steps to remove the convection heating element.
Procedure for removing the damper motor and switch.
Removal of multiple door-related interlock and monitor switches.
Adjusting door switches for proper operation.
General procedure for replacing the oven door assembly.
Steps to remove the entire door assembly.
Procedure for reinstalling the oven door assembly.
Steps to disassemble the oven door for component replacement.
Procedure for removing the door choke cover.
Steps to remove the oven door frame.
Removal of door latch components and panel.
Procedure for removing the oven door's front glass panel.
Guidelines for safely handling sensitive electronic parts like CMOS LSI.
Visual identification of common electronic components used in servicing.
Procedures and precautions for servicing the touch control panel.
List of essential tools required for touch control panel servicing.
Additional safety and handling precautions for control unit servicing.
List of electrical components and their part numbers.
List of cabinet and exterior parts with part numbers.
List of parts related to the oven's control panel.
List of internal oven components and their part numbers.
List of parts that make up the oven door assembly.
List of miscellaneous items like manuals and templates.
List of various fasteners and hardware used in the oven.
