Amana Rfs18g Service Manual

Microwave Oven Service Manual

RFS18G

CAUTION

BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

RFS18MPS

This device is to be serviced only by properly qualified service personnel. Consult the service manual for proper service procedures to assure continued safety operation and for precautions to be taken to avoid possible exposure to excessive microwave energy.

PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY

A) Do not operate or allow the oven to be operated with the door open.

B) Make the following safety checks on all ovens to be serviced before activating the magnetron or other

microwave source, and make repairs as necessary; (1) interlock operation, (2) proper door closing, (3)

seal and sealing surfaces (arcing, wear, and other damage), (4) damage to or loosening of hinges and

latches, (5) evidence of dropping or abuse.

C) Before turning on microwave power for any service test or inspection within the microwave generating

compartments, check the magnetron, wave guide or transmission line, and cavity for proper alignment,

integrity, and connections.

D) Any defective or misadjusted components in the interlock, monitor, door seal, and microwave generation

and transmission systems shall be repaired, replaced, or adjusted by procedures described in this manual

before the oven is released to the owner.

E) A microwave leakage check to verify compliance with the Federal Performance Standard should be

performed on each oven prior to release to the owner.

SAFETY PRECAUTIONS

CONTENTS

(Page)

SAFETY PRECAUTIONS SPECIFICATIONS CAUTIONS

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INSTALLATIONS

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OPERATING INSTRUCTIONS

FEATURES

CONTROL PANEL

COOKING DISPLAYS 4-3

OPERATION

PROGRAMMING

SCHEMATIC DIAGRAM

CIRCUIT DESCRIPTION

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SERVICE INFORMATION

TOOLS AND MEASURING INSTRUMENTS

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Inside front cover

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1-1

2-1 3-1 4-1

4-2

4-4

4-5

4-7

4-8

5-1

MICROWAVE LEAKAGE TEST

MEASUREMENT OF MICROWAVE POWER OUTPUT

DISASSEMBLY AND ADJUSTMENT

INTERLOCK CONTINUITY TEST

COMPONENT TEST PROCEDURE

TROUBLE SHOOTING

EXPLODED VIEW 6-1

SCHEMATIC DIAGRAM OF P.C.B. 7-1

CIRCUIT BOARD

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5-1

5-3

5-7

5-8

5-11

7-2

1-1

This microwave oven is designed for commercial use only.

It is not recommended for buelt-in Installation.

ITEM

MODEL

Power Requirement

Power Output

Microwave Frequency

Magnetron

Timer

Outside Dimensions

Cavity Dimensions

Net Weight

Shipping weight

Control Complement

Nameplate Location

Accessories

DESCRIPTION

RFS18G/RFS18MPS

208/220-240 Volts AC 60 Hz 2,800 Watts (13 A)

Single phase, 3 wire grounded

1,800 Watts full microwave power (IEC60705)

2,450 MHz

2M246

0 ~ 60 min.

64 lbs (approx.) 71 lbs (approx.)

Touch Control System

Clock : 00 ~ 60

Microwave Power for Variable Cooking

Power level

HIGH -------------------------------Full power throughout the cooking time

70% (Med.-High)----------------approx. 70% of Full power

50% (Med.-Low) ---------------approx. 50% of Full power

20% (Low) -----------------------approx. 20% of Full power

Time chart

SPECIFICATIONS

Back side

¥ DO NOT operate on a 2-wire extension cord during

repair and use.

¥ NEVER TOUCH any oven components or wiring during

operation.

¥ BEFORE TOUCHING any parts of the oven, always

remove the power plug from the outlet.

¥ For about 30 seconds after the oven stops, an electric

charge remains in the high voltage capacitor. When replacing or checking, you must discharge the high voltage capacitor by shorting across the two terminals with an insulated screwdriver.

Remove your watches whenever working close to or

replacing the Magnetron.

¥ DO NOT touch any parts of the control panel circuit. A

resulting static electric discharge may damage this

P.C.B. ¥ 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.

¥ Proper operation of the microwave oven requires that

the magnetron be assembled to the waveguide and cavity. Never operate the magnetron unless it is properly installed.

¥ Be sure that the magnetron gasket is properly

installed around the dome of the tube whenever installing the magnetron.

2-1

CAUTIONS

Unlike other appliances, the microwave oven is high-voltage and high-current equipment. Though it is free from danger in ordinary use, extreme care should be taken during repair.

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

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 connection. All input and output microwave connections, waveguide, flange, and gasket must be secure never operate the device without a microwave energy absorbing load attached. Never look into an open waveguide or antenna while the device is energized.

Gasket

ANTENNA

COOLING FIN

MAGNETRON CHASSIS GROUND

FILAMENT TERMINALS

MAGNETRON

FILAMENT

TERMINALS

MAGNETRON

Gasket

ANTENNA

COOLING FIN

MAGNETRON

CHASSIS GROUND

INSTALLATIONS

3-1

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 and 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. Do not install the oven next to a conventional surface unit or above a conventional wall oven.

5. Use microwave oven in an ambient temperature less

than 104¡F(40¡C).

6. Place the microwave oven as far away as possible

from TV, RADIO, COMPUTER, etc., to prevent interference.

7. Place the microwave oven on a stardy and flat surface.

GROUNDING INSTRUCTIONS

For personal safety, this appliance must be fully grounded at all times.

In the event of an electrical short circuit, grounding reduces the risk of electrical shock. The plug must be plugged into an outlet that is properly installed and grounded.

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

WARNING

Improper use of the grounding plug can result in a risk of electric shock. Do not, under any circumstances, cut or remove the third ground prong from the power cord plug.

A - Allow at least 1

/2 inches (3.81 centimeters) of clearance

around top and sides of equipment. Proper air flow around equipment cools electrical components. With restricted air flow, oven may not operate properly and life of electrical parts is reduced.

B - Allow at least 3 inches from door front to edge of countertop to

avoid accidental tipping of oven.

PREFERRED METHOD

ENSURE PROPER GROUND

EXISTS BEFORE USE

4-1

OPERATING INSTRUCTIONS

Window Door Screen

Safety Door Lock System

Electronic Control

Door Open Button

Turntable

Rotating Ring

Splatter Shields

FEATURES

CONTROL PANEL

Display

Some items in display can be seen but will not glow.

Pads

Use to enter heating time without changing preprogrammed number pads.

Use to begin heating with preprogrammed times and power levels or to enter times for “Manual Time Entry” cooking.

Use to select power level. Oven can heat at full or reduced power. If oven power level is set to 0% oven does not heat for programmed time. If no power level is selected, oven operates at 100% power.

Use to exit programming mode and stop cooking during cooking cycle.

Use to start “Manual Time Entry” program

Use to automatically increase the programmed time for double quantities.

or restart interrupted cooking cycle. Use to advance to next user option. Use to save times and power levels when programming pads.

TIME ENTRY

Pads 1-0

HOLD 0%, DEFROST 20%, MEDUIM 50%, MED-HI 70%

STOP/RESET

START

QTY2x

8 9 0

Window Door Screen

Electronic Control

Safety Door Lock System

RFS18MPS

HOLD

DEFROST

20%

MEDIUM

50%

MED-HI

70%

TIME

ENTRY

STOP

RESET

START

1 2 3 4 5 6 7 8 9 0

FEATURES

4-2

OPERATING INSTRUCTIONS

FEATURES

CONTROL PANEL

Display

Some items in display can be seen but will not glow.

Pads

Use to enter heating time without changing preprogrammed number pads.

Use to begin heating with preprogrammed

Use to enter times for “Manual Time Entry”

times and power levels or to enter times for “Manual Time Entry” cooking.

cooking.

Use to select power level. Oven can heat at full or reduced power. If oven power level is set to 0% oven does not heat for programmed time. If no power level is selected, oven operates at 100% power.

Use to exit programming mode and stop cooking during cooking cycle.

Use to start “Manual Time Entry” program

Use to automatically increase the programmed time for double quantities.

or restart interrupted cooking cycle. Use to advance to next user option. Use to save times and power levels when programming pads.

RFS18G

TIME ENTRY

DIAL

Pads 1-0

POWER LEVEL

STOP/RESET

START

QTY2x

9 0

Window Door Screen

Electronic Control

Safety Door Lock System

POWER

LEVEL

QTY

TIME

ENTRY

CONTROL PANEL

Window Door Screen

Electronic Control

Safety Door Lock System

Display

Some items in display can be seen but will not glow.

Pads

8 9 0

TIME ENTRY

Pads 1-0

HOLD 0%, DEFROST 20%, MEDUIM 50%,

STOP/RESET

START

QTY2x

Use to enter heating time without changing preprogrammed number pads.

Use to begin heating with preprogrammed times and power levels or to enter times for “Manual Time Entry” cooking.

Use to select power level. Oven can heat at full or reduced power. If oven power level is set to 0% oven does not heat for programmed time. If no power level is selected, oven operates at 100% power.

Use to exit programming mode and stop cooking during cooking cycle.

Use to start “Manual Time Entry” program or restart interrupted cooking cycle. Use to advance to next user option. Use to save times and power levels when programming pads.

Use to automatically increase the programmed time for double quantities.

4-3

Cooking Displays

Shows when power is connected to oven. Open and close door to clear.

READY shows when oven control will accept entries. Appears after oven door is opened and closed.

88:88 shows heating time. When more than 1 heating stage is programmed, total time for all stages displays.

COOK shows when oven is operating.

20 indicates the microwave power level used. If power level does not show, oven is heating at 100% power.

Programming Displays

Indicates programming mode. See ÒProgrammingÓ section of manual for programming procedure.

Indicates programming user options mode. See ÒUser OptionsÓ section of manual for programming procedure.

Cooking Displays

Shows when power is connected to oven. Open and close door to clear.

READY shows when oven control will accept entries. Appears after oven door is opened and closed.

33:33 shows heating time. When more than 1 heating stage is programmed, total time for all stages displays.

COOK shows when oven is operating. 20 indicates the microwave power level used. If power level

does not show, oven is heating at 100% power.

Cooking DisplaysCooking DisplaysCooking Displays

Programming Displays

Indicates programming mode. See “Programming” section of manual for programming procedure.

Indicates programming user options mode. See “User Options” section of manual for programming procedure.

Programming DisplaysProgramming DisplaysProgramming Displays

4-4

Operation

Pads

1 2 3 4 5 6 7 8 9 0

Heating Times

10 sec. 20 sec. 30 sec. 45 sec. 1 min. 1:30 min. 2 min. 3 min. 4 min. 5 min.

Pads

01 02 03 04 05 06 07 08 09 10

1. Press Pad.

CAUTION

Interrupting Operation

• Open oven door to interrupt operation. Oven fan continues to operate. Close door and press START pad to resume oven operation.

• Press STOP/RESET pad to interrupt operation. Display continues to show countdown time. Press START pad to resume oven operation and countdown timing.

Canceling Mistakes

• If oven is operating, press STOP/RESET pad once to

stop oven, then again to clear display.

• If oven door is open and time shows in display, close oven door and press STOP/RESET pad to clear display.

Operating Preprogrammed Pads

Oven has 10 ~ 20 preprogrammed number pads. Instructions are written for factory programmed ovens. Ovens that are reprogrammed can respond differently than described below.

1. Open oven door , place food in oven, and close oven

door

• If pad is not pressed in 30 seconds, open and close oven door again.

2. Press desired number pad.

• Oven operates and time counts down.

3. Oven stops heating and oven signal sounds when heating timing elapses.

Operating QTY 2X Pads

QTY

2. Press desired number pad

• Example : press + = 18 sec.

Preprogrammed Times and Cook Level

All preprogrammed pads arrive set at full power.

Option: Single Digit

Pads

11 12 13 14 15 16 17 18 19 20

Heating Times

10 sec. 20 sec. 30 sec. 45 sec. 1 min. 1:30 min. 2 min. 3 min. 4 min. 5 min.

Heating Times

20 sec. 40 sec. 1 min. 1:30 min. 2 min. 3 min. 4 min. 6 min. 8 min. 10 min.

Option: Double Digit

Manual Time Entry

Manual Time Entry feature allows the operator to enter time and power levels, and heat without changing the preprogrammed pads.

1. Open oven door, place food in oven, and close door.

• Display shows "READY".

• If pad is not pressed in 30 seconds, open and close oven door again.

2. Press TIME ENTRY pad.

• Display shows "00:00".

3. Press number pads to enter desired cooking time.

• For example, to heat for 2 minutes 30 seconds,

press 2, 3, and 0 pads.

4. Press desired power level pad to change power level.

• If a power level pad is not pressed, oven defaults to 100% power.

• For example, pressing MEDIUM 50% pad sets oven to 50% power.

• Display shows current power level if other than 100 percent power.

5. Press START pad.

• Oven operates and time counts down.

6. Oven stops heating and oven signal sounds when heating timing elapses.

QTY

To avoid fire, do not dry newspapers or clothes in microwave oven.

4-5

PROGRAMMING

Preprogrammed Number Pads

Oven has 10 preprogrammed number pads. Follow instructions below to program heating times and power levels for customized cooking.

1. Open oven door. ¥ If door is closed or STOP/RESET pad is pressed

before finishing programming sequence, oven exits programming mode.

2. Press and hold pad 1 for approximately 5 seconds. ¥ After 5 seconds, signal sounds. Display shows

ÒPROGRAMÓ indicating program mode..

3. Press desired number pad. ¥ Display shows heating time, ÒCOOK LEVELÓ and

power level if other than 100 percent power.

4. Press number pads to enter desired cooking time. ¥ For example, to heat for 2 minutes 30 seconds,

press 2, 3, and 0 pads.

5. Press desired power level pad to change power level. ¥ If a power level pad is not pressed, oven defaults to

100% power.

¥ For example, pressing MEDIUM 50% pad sets oven

to 50% power.

¥ Display shows current power level if other than 100%

power.

6. Press START pad to save new heating time and power level in oven memory. ¥ Repeat step 3-6 to program additional pads.

7. Press STOP/RESET pad or close oven door to exit programming mode.

Multiple Heating Stages

Follow instructions below to program oven to perform 3 consecutive heating cycles without interruption.

1. Open oven door. ¥ If door is closed or STOP/RESET pad is pressed

before finishing programming sequence, oven exits programming mode.

2. Press pad 1 for approximately 5 seconds. ¥ After 5 seconds, signal sounds.

3. Press desired number pad. ¥ Display shows heating time and preprogrammed

number.

4. Press number pads to enter desired cooking time. ¥ For example, to heat for 2 minutes 30 seconds,

5. Press desired power level pad to change power level. ¥ If a power level pad is not pressed, oven defaults to

100% power.

¥ For example, pressing MEDIUM 50% pad sets oven

to 50% power.

¥ Display shows current power level if other than 100

percent power.

6. Press TIME ENTRY pad ¥ Display briefly shows ÒSTAGE 2Ó . Then cook time

and power level for stage show in display.

¥ Repeat steps 5-6 to create additional stages.

7. Press START pad to save new heating time and power level in oven memory.

8. Press STOP/RESET pad or close oven door to exit programming mode.

4-6

User Options

Follow the instructions below to customized the microwave ovenÕs operation. End-of-cycle signal, maximum heating time and other options can be changed to meeting your cooking needs.

1. Open oven door. ¥ If door is closed or STOP/RESET pad is pressed

before finishing programming sequence, oven exits programming mode.

2. Press and hold pad 2 for approximately 5 seconds. ¥ After 5 seconds, signal sounds. Display shows

ÒOPTIONÓ.

3. Press number pad that matches desired option. ¥ ÒOPÓ represents optional program mode, first number

represents option number and second number represents functions currently selected for option.

4. Press START pad to advance to next option. See table for options.

5. Press number pad (0,1-3) to change option.

6. Press START pad to save changes. ¥ Repeat steps 4-6 to change additional options.

7. Press STOP/RESET pad or close oven door to exit programming mode.

Optional Program Pad Option Indicator Number Selected

SCHEMATIC DIAGRAM

4-7

NOTICE: SINCE THIS IS BASIC SCHEMATIC DIAGRAM, THE VALUES OF COMPONENTS AND

SOME PARTIAL CONNECTIONS ARE SUBJECT TO CHANGE FOR IMPROVEMENT.

IMPORTANT SAFETY NOTE: THE SHADED AREAS ON THIS SCHEMATIC DIAGRAM INCORPORATE SPECIAL FEATURES

IMPORTANT FOR PROTECTION FROM MICROWAVE RADIATION, FIRE, ELECTRICAL SHOCK, AND

HAZARDS. WHEN SERVICING IT IS ESSENTIAL THAT ONLY MANUFACTURER'S SPECIFIED PARTS

BE USED FOR THE CRITICAL COMPONENTS IN THE SHADED AREAS OF THE SCHEMATIC DIAGRAM.

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