MICROWAVE OVEN
G643CR
SERVICE Manual 
MICROWAVE OVEN
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M643CR
Auto |
Auto |
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CONTENTS
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
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.
Samsung Electronics
1. Precaution
Follow these special safety precautions. Although the microwave oven is completely safe during ordinary use, repair work can be extremely hazardous due to possible exposure to microwave radiation, as well as potentially lethal high voltages and currents.
1-1 Safety precautions ( 
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1.All repairs should be done in accordance with the procedures described in this manual. This product complies with Federal Performance Standard 21 CFR Subchapter J (DHHS).
2.Microwave emission check should be performed to prior to servicing if the oven is operative.
3.If the oven operates with the door open : Instruct the user not to operate the oven and contact the manufacturer and the center for devices and radiological health immediatly.
4.Notify the Central Service Center if the microwave leakage exceeds 5 mW/cm2
5.Check all grounds.
6.Do not power the MWO from a "2-prong" AC cord. Be sure that all of the built-in protective devices are replaced. Restore any missing protective shields.
7.When reinstalling the chassis and its assemblies, be sure to restore all protective devices, including: nonmetallic control knobs and compartment covers.
8.Make sure that there are no cabinet openings through which people--particularly children--might insert objects and contact dangerous voltages. Examples: Lamp hole, ventilation slots.
9.Inform the manufacturer of any oven found to have emmission in excess of 5 mW/cm2, Make repairs to bring the unit into compliance at no cost to owner and try to determine cause.
Instruct owner not to use oven until it has been brought into compliance.
CENTRAL SERVICE CENTER
10.Service technicians should remove their watches while repairing an MWO.
11.To avoid any possible radiation hazard, replace parts in accordance with the wiring diagram. Also, use only the exact replacements for the following parts: Primary and secondary interlock switches, interlock monitor switch.
12.If the fuse is blown by the Interlock Monitor Switch: Replace all of the following at the same time: Primary and secondary switches, as well as the Interlock Monitor Switch. The correct adjustment of these switches is described elsewhere in this manual. Make sure that the fuse has the correct rating for the particular model being repaired.
13.Design Alteration Warning:
Use exact replacement parts only, i.e., only those that are specified in the drawings and parts lists of this manual. This is especially important for the Interlock switches, described above. Never alter or add to the mechanical or electrical design of the MWO. Any design changes or additions will void the manufacturer's warranty.10.Always unplug the unit's AC power cord from the AC power source before attempting to remove or reinstall any component or assembly.
14.Never defeat any of the B+ voltage interlocks. Do not apply AC power to the unit (or any of its assemblies) unless all solid-state heat sinks are correctly installed.
15.Some semiconductor ("solid state") devices are easily damaged by static electricity. Such components are called Electrostatically Sensitive Devices (ESDs). Examples include integrated circuits and field-effect transistors.
Immediately before handling any semiconductor components or assemblies, drain the electrostatic charge from your body by touching a known earth ground.
16.Always connect a test instrument's ground lead to the instrument chassis ground before connecting the positive lead; always remove the instrument's ground lead last.
Samsung Electronics |
1-1 |
Pretaution
1-2 Special Servicing Precautions (Continued)
17.When checking the continuity of the witches or transformer, always make sure that the power is OFF, and one of the lead wires is disconnected.
18.Components that are critical for safety are indicated in the circuit diagram by shading, 
or 
.
19.Use replacement components that have the same ratings, especially for flame resistance and dielectric strength specifications. A replacement part that does not have the same safety characteristics as the original might create shock, fire or other hazards.
1-3 Special High Voltage Precautions
1.High Voltage Warning
Do not attempt to measureany of the high voltages--this includes the filament voltage of the magnetron. High voltage is present during any cook cycle.
Before touching any components or wiring, always unplug the oven and discharge the high voltage capacitor (See Figure 1-1)
2.The high-voltage capacitor remains charged about 30 seconds after disconnection. Short the negative terminal of the high-voltage capacitor to to the oven chassis. (Use a screwdriver.)
3.High voltage is maintained within specified limits by close-tolerance, safety-related components and adjustments. If the high voltage exceeds the specified limits, check each of the special components.
Fig. 1-1. Discharging the High Voltage Capacitor
1-2 |
Samsung Electronics |
2. Specifications
2-1 Table of Specifications
TIMER |
99 MINUTES 90 SECONDS |
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POWER LEVEL |
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POWER SOURCE |
230V 50Hz, AC |
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ON TIME |
OFF TIME |
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G643CR |
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POWER CONSUMPTION |
MICROWAVE : 1,350W |
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10% |
80W |
4 sec |
26 sec |
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GRILL : 1,000W |
20% |
160W |
7 sec |
23 sec |
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OUTPUT POWER |
FROM80 TO 800W (10 LEVEL POWER) |
30% |
240W |
10 sec |
20 sec |
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40% |
320W |
13 sec |
17 sec |
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(IEC-705 TEST PROCEDURE) |
50% |
400W |
16 sec |
14 sec |
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OPERATING FREQUENCY |
2,450MHz |
60% |
480W |
19 sec |
11 sec |
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70% |
560W |
22 sec |
8 sec |
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MAGNETRON |
OM75SH(31) |
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80% |
640W |
25 sec |
5 sec |
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COOLING METHOD |
COOLING FAN MOTOR |
90% |
720W |
28 sec |
2 sec |
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OUTSIDE DIMENSIONS |
489(W) x 275(H) x 365(D) |
100% |
800W |
30 sec |
0 sec |
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2-2 Comparison Chart
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MODEL |
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FEATURE |
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G643CR |
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MORE/LESS |
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O |
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AUTO COOK/DISH |
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O |
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AUTO DEFROST |
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O |
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TIME COOK |
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O |
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POWER LEVEL |
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O |
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INSTANT COOK |
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O |
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MEMORY |
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O |
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BOOST |
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O |
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CHILD LOCK |
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O |
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CLOCK |
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O |
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GRILL |
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O |
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COMBI |
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O |
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Samsung Electronics |
2-1 |
3. Operating Instructions
3-1 Control Panel
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G643CR |
Instant Cook Button
Auto Cook Button
Auto Defrost Button
Memory Button
Kg,g, more and less Button Clock Setting Button
Power Level Selection Button
Timer Setting Button
Combi Button
Grill Button
Stop Button
Standard Boost Button
3-2 Features & External Views
Door |
Ventilation Slot |
Heater |
Light |
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Safety Interlock Holes |
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Auto |
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Control Panel |
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Door Latches |
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M |
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G645C |
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Open Door Push Button |
Glass Plate |
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Metal Rack |
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Guide Roller |
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Auto |
275mm |
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Auto |
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G645C |
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203mm |
356.5mm |
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489mm |
365mm |
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Samsung Electronics |
3-1 |
4. Disassembly and Reassembly
4-1 Replacement of Magnetron, Motor Assembly and Lamp
Remove the magnetron including the shield case, permanent magnet, choke coils and capacitors (all of which are contained in one assembly).
1.Disconnect all lead wires from the magnetron and lamp.
2.Remove a screw securing the magnetron supporter.
3.Remove the magnetron supporter.
4.Remove the air cover.
5.Remove screws securing the magnetron to the wave guide.
6.Take out the magnetron very carefully.
7.Remove screws from the back panel.
8.Take out the fan motor.
9.Remove the oven lamp by rotating to pull out from hole of air cover.
NOTE1: When removing the magnetron, make sure that its antenna does not hit any adjacent parts, or it may be damaged.
NOTE2: When replacing the magnetron, be sure to remount the magnetron gasket in the correct position and make sure the gasket is in good condition.
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Thermo S/W |
Lamp |
Fan Motor
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Screw |
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H. V. Trans |
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Magnetron |
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V. Capacitor |
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H. |
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4-1 Replacement of High Voltage Transformer
1.Discharge the high voltage capacitor.
2.Disconnect all the leads.
3.Remove the mounting bolts.
4.Reconnect the leads correctly and firmly.
H. V. Trans
Screws
Samsung Electronics |
4-1 |
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