Samsung G643CR User Manual

22 pages

To Next Page

To Next Page

Page #1 background image

Loading...

Page #1 background image

MICROWAVE OVEN

G643CR

SERVICE

Manual

MICROWAVE OVEN CONTENTS

Auto

10min

1min

h

10s.

min

G643C

1 min +

Auto

lbs.

oz.

g

kg

lbs.

kg

oz.

g

h

10min

min

1min

Auto Auto

10s.

M

M643CR

1. Precaution

2. Specifications

3. Operating Instructions

4. Disassembly and Reassembly

5. Alignment and Adjustments

6. Troubleshooting

7. Exploded Views and Parts List

8. PCB Diagrams

9. Schematic Diagrams

BWT

Questions and Answers:

R
Rachel KleinAug 20, 2025
What to do if Samsung G643CR timer starts but there is no heat?
- G
  georgeheatherAug 20, 2025
  If your Samsung Microwave Oven isn't heating but the timer is running, and the oven lamp and fan are working, several issues could be the cause. It might be due to misaligned latch switches (adjust the door and latch switches), a loose connection in the high voltage circuit (check the high voltage components), defective high voltage components like the transformer, capacitor, diode, fuse, or magnetron (test these components), loose wiring of the power relay (check the wiring), a defective primary latch switch (check the switch), or a defective power relay or Ass'y PCB (replace the PCB main).
R
richard44Aug 22, 2025
Why does my Samsung Microwave Oven stop during cooking?
- J
  Jeffrey LevyAug 22, 2025
  If your Samsung Microwave Oven stops operating during cooking, it could be due to an open or loose wiring of the primary interlock switch, or the operation of thermal cutout (Magnetron). Try adjusting the door and latch switches.
E
ewebsterAug 25, 2025
What to do if Samsung G643CR does not accept key input?
- M
  Maxwell CuevasAug 25, 2025
  If your Samsung Microwave Oven does not accept key input (program), it may be because the key input is not in sequence (refer to the operation procedure), there is an open or loose connection of the membrane key pad to the Ass'y PCB, the membrane panel is shorted or open, or the Ass'y PCB is defective. In the last three cases replace PCB main.
V
Vincent StewartAug 26, 2025
Why is the microwave output low in my Samsung G643CR Microwave Oven?
- R
  Rebecca GoodwinAug 26, 2025
  If the microwave output of your Samsung Microwave Oven is low, and it takes longer to cook food, it could be due to a decrease in power source voltage, open or loose wiring of the magnetron filament circuit, or the aging of the magnetron. It is advised to consult an electrician.
J
Joseph KimAug 28, 2025
What to do if Samsung Microwave Oven does not operate?
- G
  George ChavezAug 28, 2025
  If your Samsung Microwave Oven does not operate and returns to the plugged-in mode, the Ass'y PCB may be defective. Replace the PCB main.
K
Kevin MccormickAug 30, 2025
Why Samsung G643CR turntable motor does not rotate?
- S
  Shawn AdamsAug 30, 2025
  If the turntable motor in your Samsung Microwave Oven doesn't rotate, it could be due to open or loose wiring or a defective turntable motor. Replace the turntable motor.
C
Cynthia CampbellSep 1, 2025
Why Samsung G643CR Microwave Oven is dead but the fuse is OK?
- F
  Frank BellSep 1, 2025
  If your Samsung Microwave Oven is completely dead, with no display or operation, but the fuse is fine, the issue could stem from several causes: an open or loose lead wire harness (check the fan motor if the thermal cutout is defective), an open thermal cutout (magnetron) (check the fan motor if the thermal cutout is defective), an open low voltage transformer (check the Ass'y PCB if the LVT is defective), or a defective Ass'y PCB (check the Ass'y PCB if the LVT is defective).
B
butlerdavidSep 3, 2025
What to do if Samsung G643CR Microwave Oven has no display and the fuse is blown?
- M
  Matthew FisherSep 3, 2025
  If your Samsung Microwave Oven shows no display and doesn't operate, and the fuse has blown, it could be due to a shorted lead wire harness, a defective primary latch switch, a defective monitor switch, a shorted HV capacitor, or a shorted HV transformer. In any of these cases, check the adjustment of the primary, interlock monitor, and door sensing switch.
T
Tyler MyersSep 5, 2025
Why is my Samsung Microwave Oven sparking?
- H
  Heather BenjaminSep 5, 2025
  If your Samsung Microwave Oven is sparking, it's likely due to metallic ware or cooking dishes touching the oven wall, or ceramic ware trimmed with gold or silver powder. Avoid using cookware with metallic trimming.
S
Scott MullinsSep 7, 2025
Why is my Samsung Microwave Oven making a loud buzzing noise?
- P
  powelljosephSep 7, 2025
  If your Samsung Microwave Oven is making a loud buzzing noise, it could be due to a loose fan or fan motor (tighten the screws), loose screws on the H.V. Transformer (tighten the screws), or a shorted H.V. Diode (replace the diode).

Samsung G643CR Specifications

General

Brand	Samsung
Model	G643CR
Category	Microwave Oven
Language	English

Summary

Microwave Oven Precautions

Microwave Servicing Safety Precautions

Essential safety measures to avoid microwave energy exposure during service.

General Safety Precautions for Servicing

Covers all repairs, emission checks, door operation, and protective devices.

Special Servicing Precautions

Guidelines for continuity checks, critical components, and replacement parts.

High Voltage Safety Precautions

Crucial warnings and procedures for handling high voltage components and capacitors.

Microwave Oven Disassembly and Reassembly

Magnetron, Motor, and Lamp Replacement

Procedure for removing and replacing magnetron, motor assembly, and oven lamp.

High Voltage Transformer Replacement

Steps for safely removing and replacing the high voltage transformer.

Door Assembly Replacement Procedure

Detailed steps for removing and reassembling the microwave oven door.

Door Assembly Reassembly Test

Fuse Replacement Guide

Instructions for replacing the main fuse, including troubleshooting steps.

Drive Motor Replacement Procedure

Ceramic Heater Replacement

Control Circuit Board Replacement

Microwave Oven Alignment and Adjustments

High Voltage Transformer Checks

Low Voltage Transformer Checks

Magnetron Checks and Diagnosis

High Voltage Capacitor Checks

High Voltage Diode Checks

Switch Adjustments and Continuity

Magnetron Output Power Measurement

Procedure to measure magnetron output power using a water temperature rise test.

Heat Distribution Evenness Test

Microwave Oven Troubleshooting

Electrical Malfunction Troubleshooting

Diagnosing common electrical issues like no display, no operation, or blown fuse.

Related product manuals

Preview: Samsung GE87M

Preview: Samsung GE83X

Preview: Samsung GE872

Preview: Samsung GE86N

Preview: Samsung GE86V

Preview: Samsung GW71B

Preview: Samsung GW71E

Preview: Samsung GE83M