Sharp SMD2470AHA - User Manual

To Next Page

SMD2470AHAUPDATE

S17M398SMD0AH

MICROWAVE

DRAWER MODEL

SERVICE MANUAL

TABLE OF CONTENTS

Page

PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO

AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY ..................... INSIDE FRONT COVER

BEFORE SERVICING ....................................................................................................... INSIDE FRONT COVER

WARNING TO SERVICE PERSONNEL ................................................................................................................. 3

MICROWAVE MEASUREMENT PROCEDURE ..................................................................................................... 4

FOREWORD AND WARNING ............................................................................................................................... 5

PRODUCT SPECIFICATIONS ............................................................................................................................... 6

SCHEMATICS ...................................................................................................................................................... 10

TROUBLE SHOOTING GUIDE.............................................................................................................................11

TEST PROCEDURES .......................................................................................................................................... 13

MICROWAVE DRAWER DISASSEMBLY ............................................................................................................. 25

WIRING DIAGRAMS ............................................................................................................................................ 32

PARTS LIST ......................................................................................................................................................... 33

PACKING AND ACCESSORIES .......................................................................................................................... 39

This document has been published to be used for after sales service only. The contents are subject to change without notice.

SHARP ELECTRONICS CORPORATION

SMD2470AHA

In the interest of user-safety the unit should be restored to its original condition and only parts identical to those speciﬁed should

be used.

WARNING TO SERVICE PERSONNEL:

This service manual is intended for use by persons having electrical and mechanical training and a level

of knowledge of these subjects generally considered acceptable in the appliance repair trade. SHARP

ELECTRONICS CORPORATION cannot be responsible, nor assume any liability, for injury or damage of any

kind arising from the use of this manual.

* FOR SERIAL NUMBERS: 500001 ~ AND ABOVE

Units with Serial Number range 500001 ~ and above employ a change to the

connectors on various Components, Harnesses and PWB’s.

Use this Service Manual for all units with the Serial Number range

500001 ~ and above.

*NOTE:

Main Page

Need help?

Do you have a question about the Sharp SMD2470AHA and is the answer not in the manual?

This document provides a comprehensive service manual for the Sharp SMD2470AHA Microwave Drawer, detailing its functions, technical specifications, usage, and maintenance procedures.

Function Description

The Sharp SMD2470AHA is a microwave drawer designed for convenient and flexible cooking. It features a control panel with various cooking modes and settings, including sensor cooking functions for potatoes, popcorn, and other foods. The drawer design allows for easy loading and unloading of food items, making it suitable for integration into kitchen cabinetry. It incorporates a variable cooking power system, allowing users to select different power levels from P-HI (100% full power) down to P-0 (no power) for precise cooking control. The device also includes a defrost function, a timer, and a clock.

Important Technical Specifications

Power Requirements: 120 Volts, 14.5 Amperes, 1000 watts, 60 Hz, single phase, 3-wire grounded. Standby power is 1 Watt.
Power Output: 1000 watts (IEC TEST PROCEDURE) with an operating frequency of 2450MHz.
Cooking Cavity Dimensions: Width 17-11/32", Height 7-7/8", Depth 16-1/2".
Outside Dimensions: Width 23-7/8", Height 15-3/4", Depth 23-1/16".
Packing Case Dimensions: Width 27-11/16", Height 21-1/2", Depth 25-1/16".
Packed Unit Weight: 86 Lbs.
Control Complement: Touch Control System with a clock (1:00 - 12:59) and a timer (0 - 99 minutes, 99 seconds). It supports microwave power for variable cooking with 11 power levels (P-HI to P-0).
Sensor Cooking: Features settings for Popcorn, Reheat, Potatoes, Vegetables, Cook, and SETTINGS for Beverage, Defrost, Melt/Soften, Keep Warm, Help/Settings.
Oven Cavity Light: Yes.
Safety Standard: UL Listed, FCC Authorized, DHHS Rules, CFR, Title 21, Chapter 1, Subchapter J.
Grounding: The oven is equipped with a three-prong grounding plug, which must be plugged into a wall receptacle that is properly installed and grounded in accordance with national electrical codes. An electrical short circuit reduces the risk of electric shock by providing an escape wire for the electric current.
Relay Specifications:
- RY1 (Oven lamp/stir fan motor/fan motor): Approx. 25V D.C.
- RY2 (Power transformer): Approx. 25V D.C.
- RY3 (Stirrer motor): Approx. 26V D.C.
- RY4 (Fan motor): Approx. 26V D.C.
Humidity Sensor Circuit: The humidity sensor includes two thermistors, R1 and R2, which form a bridge circuit. The output of this bridge circuit is amplified by an operational amplifier. The sensor detects moisture and humidity to adjust cooking time and power.

Usage Features

The microwave drawer offers various operational modes and features designed for user convenience:

Cooking Modes: Includes standard microwave cooking with adjustable power levels, as well as specialized sensor cooking programs for common food items like potatoes, popcorn, and vegetables.
Defrost Function: Allows for defrosting food by weight, with settings for 0.5lb, 1st, 2nd, and 3rd stages, each with specific time and power level recommendations.
Control Panel: A touch control system with a digital display for setting time, power levels, and accessing various cooking functions. It includes buttons for Popcorn, Reheat, Beverage, Defrost, Melt/Soften, Vegetables, Potatoes, Cook, Help/Settings, Open/Close, Start/+30 sec, Stop/Clear, Power Level, Timer/Clock, and Number Pad.
Drawer Operation: The drawer opens and closes automatically or manually. The "OPEN/CLOSE" button initiates the drawer movement.
Safety Precautions: Users are advised to observe all safety instructions, including precautions against possible exposure to excessive microwave energy. The oven should not be operated if the door is tightly closed, if the door brackets and hinges are defective, if the door packing is not damaged, if the door is deformed or warped, or if there is any other visible damage with the oven.

Maintenance Features

The service manual provides detailed instructions for troubleshooting, disassembly, component replacement, and testing procedures to ensure proper maintenance and repair of the microwave drawer.

Warning to Service Personnel: Emphasizes the importance of following all instructions to prevent possible exposure to microwave energy, electrical shock, and other hazards. It also warns against working on the unit with power connected and advises discharging high voltage capacitors before servicing.
Troubleshooting Guide: A comprehensive chart helps diagnose common problems based on symptoms, linking them to potential causes and recommended solutions. This includes issues related to power, display, drawer operation, and cooking performance.
Test Procedures: Detailed steps for testing various components and functions, including:
- Touch Control Panel Assembly Test: Checks the functionality of the control panel, keyboard unit, and control unit.
- Key Unit Test: Verifies the operation of the door sensing switch and associated components.
- Relay Test: Confirms the proper function of the RY1, RY2, RY3, and RY4 relays.
- Defrost Test: Checks the defrost function and associated components.
- Fuse Check and Repairs: Instructions for checking and replacing the primary noise filter unit fuse.
- AH Sensor Test: Procedures for checking the ambient humidity sensor and its associated circuit.
- Checking Control Unit: Steps to verify the functionality of the main control unit.
- Magnetron Assembly Test: Procedures for testing the magnetron and its associated high voltage components.
- Microwave Output Power Test: Methods to measure and verify the microwave output power using a water temperature rise test.
- DM Fuse Test: Checks the DM fuse and its circuit.
- Secondary Interlock Switch Test: Verifies the operation of the secondary interlock switch.
- Stop Switch Test: Confirms the functionality of the stop switch.
- Monitor Switch Test: Checks the monitor switch and its interaction with the drawer.
- Blown Monitor Fuse Test: Procedures for checking and replacing the blown monitor fuse.
- Power Transformer Test: Verifies the power transformer's resistance and voltage output.
- Noise Filter Test: Checks the noise filter unit and its components.
- High Voltage Capacitor Test: Tests the high voltage capacitor.
- Switching Power Supply Test: Checks the switching power supply unit.
Component Replacement and Adjustment Procedure: Instructions for disassembling the microwave drawer, removing and replacing specific components like the control panel, CPU, noise filter board, secondary interlock switch, monitor switch, drawer assembly, choke removal, door latch, and auto drawer gear.
Wiring Diagrams: Detailed schematics are provided for the electrical connections of the microwave drawer, including the noise filter, control unit, monitor switch, power transformer, high voltage components, and various motors.
Parts List: Comprehensive lists of electrical parts, cabinet parts, control panel parts, oven parts, door parts, and miscellaneous screws, nuts, and washers, along with their reference numbers and quantities.
Exploded Views: Diagrams illustrating the assembly of the control panel, drawer, drawer cavity, and drawer cabinet, with numbered parts corresponding to the parts list.
Packing Parts: An illustration of how the microwave drawer is packed, including support corners, cross supports, top foam, bottom foam, and the packing case.

This manual is an essential resource for service personnel, providing all necessary information to safely and effectively maintain and repair the Sharp SMD2470AHA Microwave Drawer.