GoldStar MS-103YD-MS104YD Microwave Oven Owner’s Manual

GoldStar MS-103YD-MS104YD Microwave Oven

Product Information

Specifications

• Brand: GOLDSTAR
• Model: MS-103YD
• Type: Microwave
• Replacement Parts: Available for purchase
• Number of Models: 234

Product Usage Instructions

Installation
Place the microwave on a flat, stable surface with sufficient ventilation around it. Ensure proper electrical connection following the manufacturer’s guidelines.

Power On/Off:
To power on the GOLDSTAR MS-103YD microwave, plug it into a power source and press the power button. To turn it off, press the power button again.

Setting Time and Power
Use the control panel to set the desired cooking time and power level for your food preparation. Refer to the user manual for specific instructions on time and power settings.

Cooking
Place your food or beverage inside the microwave, close the door securely, set the cooking time and power level, and start the microwave. Always follow recommended cooking times for different types of food.

Cleaning and Maintenance
Regularly clean the interior and exterior of the microwave with a mild detergent and soft cloth. Remove any food spills promptly to prevent odors and maintain hygiene.

Frequently Asked Questions (FAQ):

• Q: Where can I find genuine replacement parts for GOLDSTAR MS-103YD?
  A: Genuine replacement parts for GOLDSTAR MS-103YD can be found on the Appliance Factory Parts website or authorized retailers.

• Q: How many models are available for GOLDSTAR microwaves?
  A: There are 234 models available for GOLDSTAR microwaves, offering a wide range of options to choose from based on your needs.

• Q: What should I do if my GOLDSTAR microwave is not heating food properly?
  A: If your microwave is not heating food properly, ensure that the food is placed correctly, the door is securely closed, and the power settings are appropriate. If issues persist, contact customer support for assistance.

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GOLDSTAR MS-103YD Owner’s Manual
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MICROWAVE ()VEN
SERVICE MANIUAL
MODEL: MS-103YD/MS-104YD

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

SERVICE INFORMATION

TOOLS AND MEASURING INSTRUMENTS

NECESSARY TOOLS
Tools normally used for TV servicing are sufficient. Standard tools are listed below.

• Diagonal pliers
• Long nose pliers
• Phillips screwdriver
• Flat blade screwdriver
• Wrench (size 5mm)
• Nutdriver (size 5mm)
• Adjustable wrench
• Soldering iron
• Solder
• Vinyl insulation tape
• Polishing cloth

NECESSARY MEASURING INSTRUMENTS

• TESTER (VOL TS-DC, AC, Ohmmeter)
• Microwave survey meter
  • Holaday Hl-1500 Hl-1501
  • Narda 8100 8200
  • Inch scale
  • 600 cc non conductive material beaker (glass or plastic), inside diameter: approx. 8.5 cm (31 12 in.)
• Cylindrical and made of borosilicate glass vessel.
  • max. thickness: 3 mm
  • outside diameter: approx. 190mm
  • height: approx. 90mm
• Glass thermometer: 100 ° c or 212 ° F (1 deg scale)

MICROWAVE LEAKAGE TEST

CAUTIONS

• Be sure to check microwave leakage prior to servicing the oven if the oven is operative prior to servicing.
• The service personnel should inform the manufacturer importer, or assembler of any certified oven unit found to have a microwave emission level in excess of 5 mW/cm2 and should repair any unit found to have excessive emission levels at no cost to the owner and should ascertain the cause of the excessive leakage. The service personnel should instruct the owner not to use the unit until the oven has been brought into compliance.
• The service personnel should check all surface and vent openings for microwave leakage.
• Check for microwave leakage after every servicing. The power density of the microwave radiation leakage emitted by the microwave oven should not exceed 4 mW/cm2 Always start measuring of an unknown field to assure safety for operating personnel from radiation leakage.

MEASURING MICROWAVE ENERGY LEAKAGE

• Pour 275±15cc of 20±5° C(68±9° F) water in a beaker which is graduated to 600 cc, and place the beaker on the center of the turntable.
• Set the energy leakage monitor to 2,450 MHz and use it following the manufacturer’s recommended test procedure to assure correct result.
• When measuring the leakage, always use the 2-inch (5cm) spacer supplied with the probe.
• Operate the oven at its maximum output.
• Measure the microwave radiation using and electromagnetic radiation monitor by holding the probe perpendicular to the surface being measured

Move probe along shaded area //////////////////////////////// Probe scanning speed
Less than 2.5 cm/sec( 1in/sec)

MEASUREMENT WITH OUTER CASE REMOVED

• When you replace the magnetron, measure for microwave energy leakage before the outer case is installed and after all necessary components are replaced or adjusted.
  Special care should be taken in measuring the following parts. (Circled area of Fig. below)

  • Around the magnetron
  • The waveguide

WARNING : AVOID CONTACTING ANY HIGH VOLTAGE PARTS

MEASUREMENT WITH A FULLY ASSEMBLED OVEN

• After all components, including the outer case, are fully assembled, measure for microwave energy leakage around the door viewing window, the exhaust opening, and air inlet openings.
• Microwave energy leakage must not exceed the values prescribed below.

NOTE: Leakage with the outer case removed less than 5 mW/cm.sq. Leakage for a fully assembled oven (Before the latch switch (primary) is interrupted) with the door in a slightly opened position-less than 2 mW/cm.sq.

NOTES WHEN MEASURING

• Do not exceed meter full scale deflection.
• The test probe must be removed no faster than 1 inch/sec (2.5 cm/sec) along the shaded area, otherwise a false reading may result.
• The test probe must be held with the grip portion of the handle.
• A false reading may result if the operator’s hand is between the handle and the probe.
• When testing near a corner of the door, keep the probe perpendicular to the surface making sure the probe horizontally along the oven surface; this may possibly cause probe damage.

RECORD KEEPING AND NOTIFICATION AFTER MEASUREMENT

• After adjustment and repair of any microwave energy interruption or microwave energy blocking device, record the measured values for future reference. Also enter the information on the service invoice.
• The microwave energy leakage should not be more than 4 mW/cm.sq. after determining that all parts are in good condition, functioning properly and genuine replacement parts which are listed in this manual have been used.
• At least once a year, have the electromagnetic energy leakage monitor checked for calibration by its manufacturer.

MEASUREMENT OF MICROWAVE POWER OUTPUT

• Microwave power output measurement is made with the microwave oven supplied at its rated voltage and operated at its maximum microwave power setting with a load of (1000±5) g of potable water.
• The water is contained in a cylindrical borosilicate glass vessel having a maximum material thickness of 3 mm and an outside diameter of approximately 190mm.
• The oven and the empty vessel are at ambient temperature prior to the start of the test.
• The initial temperature (T1) of the water is (10±2) ° C It is measured immediately before the water is added to the vessel. After addition of the water to the vessel, the load is immediately placed on the center of the turntable which is in the lowest position and the microwave power switched on.
• The time T for the temperature of the water to rise by a value AT of (10±2) ° K is measured, where Tis the time in seconds and AT is the temperature rise. The initial and final water temperatures are selected so that the maximum difference between the final water temperature and the ambient temperature is 5 ° K.
• The microwave power output P in watts is calculated from the following formula is measured while the microwave generator is operating at full power. Magnetron filament heat-up time is not included. (about 3 sec)
• The water is stirred to equalize temperature throughout the vessel, prior to measuring the final water temperature.
• Stirring devices and measuring instruments are selected in order to minimize addition or removal of heat.

DISASSEMBLY AND ADJUSTMENT

OUTER CASE REMOVAL

1. Disconnect the power supply cord from the outlet.
2. Remove the screws from the rear of the case.
   The outer case must be moved backward to be lifted off.

POWER SUPPLY CORD

1. Remove the outer case.
2. Disconnect two terminals, and remove one screw of the ground terminal.

CONTROL PANEL ASSEMBLY

1. Open the door.
2. Disconnect the leadwire from RELAY(RY2) of the PCB SUB ASS’Y.
3. Lift up and pull out control panel assembly carefully from the cavity.
4. Disconnect the leadwire from connector(CN1) of the PCB SUB ASS’Y.

CAUTION: DISCHARGE THE HIGH VOLTAGE CAPACITOR BEFORE SERVICING

PCB ASSEMBLY REMOVAL

1. Remove the control panel assembly from the cavity. (Refer to control panel assembly removal on previous page.)
2. Remove screws which hold the PCB SUB ASS’Y to the control panel.
3. Disconnect the flat cable from the PCB SUB ASS’Y and take off the PCB SUB ASS’Y

DOOR MAIN ASSEMBLY REMOVAL

1. Open the door.

2. Remove the choke cover cap very carefully with a flat-blade screwdriver.
   CAUTION : Be careful not to damage door seal plate with the screwdriver.

3. Lift up and push the door.

NOTE:

1. After replacing the door, be sure to check that the primary switch, monitor switch, and secondary switch operate normally.
2. After replacing the door, check for microwave energy leakage with a survey meter. Microwave energy must be below the limit of 4 mW/cm. (with a 275 ml water load)
3. When mounting the door assembly to the oven assembly, be sure to adjust the door assembly parallel to the chassis. Also adjust so the door has no play between the inner door surface and oven frame assembly. If the door assembly is not mounted properly, microwaves may leak from the clearance between the door and the oven.

MAGNETRON REMOVAL

1. Disconnect the leadwire from the magnetron.
2. Carefully remove the mounting screws holding the magnetron and the waveguide.
3. Lift magnetron at a 30 ° angle to the waveguide with the magnetron hanger unhooked.
4. Remove the magnetron assembly until the tube is clear from the waveguide.

NOTE

1. When removing the magnetron, make sure its dome does not hit any adjacent parts, or it may be damaged.
2. When replacing the magnetron, be sure to install the magnetron gasket in the correct position and be sure that the gasket is in good condition.
3. After replacing the magnetron, check for microwave leakage with a survey meter around the magnetron. Microwave energy must be below the limit of 5 mW/cm2. (With a 275 ml. water load). Make sure that gasket is rigidly attached to the magnetron. To prevent microwave leakage, tighten the mounting screws properly, making sure there is no gap between the waveguide and the magnetron.

SUCTION GUIDE MAIN ASSEMBLY
NOTE: Suction Guide Main ASS’Y consists of Latch Board ASS’Y and Suction Guide ASS’Y. To repair any of them, the Suction Guide Main ASS’Y should be removed first.

1. Disconnect the leadwire from the high voltage transformer primary terminal, thermostat, fuse holder, and turn table motor connector.
2. Remove three screws holding the Suction Guide Main ASS’Y to oven cavity.
3. Rotate right and pull out Suction Guide Main ASS’Y from the oven.

LATCH BOARD ASSEMBLY AND SUCTION GUIDE ASSEMBLY
NOTE: Suction Guide Main ASS’Y consists of Latch Board ASS’Y and Suction Guide ASS’Y. To repair any of them, the Suction Guide Main ASS’Y should be removed first.

1. Remove the connecting hook.
2. Disconnect the leadwire.

FAN MOTOR ASSEMBLY REMOVAL
NOTE: Suction Guide Main ASS’Y consists of Latch Board ASS’Y and Suction Guide ASS’Y. To repair any of them, the Suction Guide Main ASS’Y should be removed first.

1. Disconnect the leadwire from fan motor.
2. Remove the fan.
3. Remove the two screws holding the fan motor assembly to the suction guide ass’y.

HIGH VOLTAGE TRANSFORMER REMOVAL

1. Discharge the high voltage capacitor.
2. Disconnect the leadwire from magnetron, high voltage transformer, and capacitor.
3. Remove the screw holding the high voltage transformer to the base-plate.

HIGH VOLTAGE CAPACITOR AND DIODE REMOVAL

1. Discharge the high voltage capacitor. (refer to page 2-1)
2. Disconnect the leadwire from the high voltage capacitor.
3. Remove the screw holding the high voltage capacitor bracket.

REMOVING THE TURNTABLE MOTOR

1. Remove the glass turntable.

2. Remove the rotating ring ass’y by hand.

3. Remove the turntable motor cover.
   The turntable base cover is easily removed by pinching the six parts with wire cutting pliers.

4. Disconnect the leadwire from the turntable motor terminals.

5. Remove the screw securing the turntable motor to the oven cavity assembly.

6. After repairing the motor, rotate the removed turntable motor cover.

7. Fit the turntable motor cover’s projecting part to the base plate slit.

NOTE:

1. Remove the wire lead from the turntable motor VERY CAREFULLY.
2. Be sure to grasp the connector, not the wires, when removing.

INTERLOCK SYSTEM

1. INTERLOCK MECHANISM
   The door lock mechanism is a device which has been specially designed to eliminate completely microwave activity when the door is opened during cooking and thus to prevent the danger resulting from the microwave leakage.

2. MOUNTING OF THE PRIMARY/MONITOR/SECONDARY SWITCHES TO THE LATCH BOARD

3. INSTALLATION AND ADJUSTMENT OF THE LATCH BOARD TO THE OVEN ASSEMBLY

   • Mount the latch board to the oven assembly.
   • Adjust the latch board in the arrow direction so that oven door will not have any play in it when the door is closed.
   • Tighten the mounting screw.
   • Check for play in the door by pushing the door release button. Door movement should be less than 0.5 mm. (1/64 inch)
   • Don’t push the door release button while making this adjustment. Make sure that the latch moves smoothly after adjustment is completed and that the screws are tight. Make sure the primary, monitor, and secondary switches operate properly by following the continuity test procedure.

INTERLOCK CONTINUITY TEST

WARNING : FOR CONTINUED PROTECTION AGAINST EXCESSIVE RADIATION EMISSION, REPLACE ONLY WITH IDENTICAL REPLACEMENT PARTS.

TYPE NO. SZM-V 16-FA-63 OR VP-533A-OF FOR PRIMARY SWITCH
TYPE NO. SZM-V 16-FA-62 OR VP-532A-OF FOR MONITOR SWITCH
TYPE NO. SZM-V 16-FA-63 OR VP-533A-OF FOR SECONDARY SWITCH

• PRIMARY INTERLOCK SWITCH TEST
  When the door release button is depressed slowly with the door closed, an audible click should be heard at the same time or successively at intervals. When the button is released slowly, the latches should activate the switches with an audible click.
  If the latches do not activate the switches when the door is closed, the switches should be a adjusted in accordance with the adjustment procedure. Disconnect the wire lead from the primary switch. Connect the ohmmeter leads to the common (COM) and normally open (NO) terminal of the switch. The meter should indicate an open circuit in the door open condition. When the door is closed, the meter should indicate a closed circuit.
  When the primary switch operation is abnormal, make the necessary adjustment or replace the switch only with the same type of switch.

• SECONDARY INTERLOCK SWITCH TEST
  Disconnect the wire lead from the secondary switch.
  Connect the ohmmeter leads to the common
  (COM) and normally open (NO) terminals of the switch. The meter should indicate a open circuit in the door open condition. When the door is closed, meter should indicate an closed circuit. When the secondary switch operation is abnormal, make the necessary adjustment or replace the switch only with the same type of switch.

• MONITOR SWITCH TEST
  Disconnect the wire lead from the monitor switch. Connect the ohmmeter leads to the common
  (COM) and normally closed (NC) terminals of the switch. The meter should indicate closed circuit in the door open condition. When the door is closed, meter should indicate an open circuit. When the monitor switch operation is abnormal, replace with the same type of switch.
  NOTE: After repairing the door or the interlock system, it is necessary to do this continuity test before operating the oven.

COMPONENT TEST PROCEDURE

CAUTIONS

1. DISCONNECT THE POWER SUPPLY CORD FROM THE OUTLET WHENEVER REMOVING THE OUTER CASE FROM THE UNIT. PROCEED WITH THE TEST ONLY AFTER DISCHARGING THE HIGH VOLTAGE CAPACITOR AND REMOVING THE WIRE LEADS FROM THE PRIMARY WINDING OF THE HIGH VOLTAGE TRANSFORMER. (SEE PAGE 2-1)
2. ALL OPERATIONAL CHECKS WITH MICROWAVE ENERGY MUST BE DONE WITH A LOAD (1 LITER OF WATER IN CONTAINER) IN THE OVEN.

HIGH VOLTAGE TRANSFORMER

(Wire leads removed)

| |
 | SECONDARY WIRE|
 | PRIMARY TERMINAL|
 | 1.  Measure the resistance.

(Ohm-meter scale: Rx1 and Rx100)

• Primary winding
• Secondary winding
• Filament winding

| ****

**** Approx.: 0.3 ~ 0.6 ohm

Approx.: 70 ~ 100 ohm Less than: 1 ohm

 | 2.  Measure the resistance. (Ohm-meter scale: Rx1000)

• Primary winding to ground
• Filament winding to ground

| **** Normal: Infinite Normal: Infinite
MAGNETRON

(Wire leads removed)

| **** 1.  Measure the resistance. (Ohm-meter scale: Rx1)

• Filament terminal

| **** Normal: Less than 1 ohm
 | 2.  Measure the resistance. (Ohm-meter scale: Rx1000)

• Filament to chassis

| **** Normal: Infinite

TROUBLE SHOOTING
WHEN YOU GET A COMPLAINT FROM YOUR CUSTOMER, EVALUATE THE COMPLAINT CAREFULLY. IF THE FOLLOWING SYMPTOMS APPLY, PLEASE INSTRUCT THE CUSTOMER IN THE PROPER USE OF THE MICROWAVE OVEN. THIS CAN ELIMINATE AN UNNECESSARY SERVICE CALL.

CAUTIONS

1. Check grounding before checking for trouble.
2. Be careful of the high voltage circuit.
3. Discharge the high voltage capacitor. (See page 2-1)
4. When checking the continuity of the switches or of the high voltage transformer, disconnect one lead wire from these parts and then check continuity with the AC plug removed. To do otherwise may result in a false reading or damage to your meter.
5. Do not touch any part of the circuit on the PCB since static electric discharge may damage this control panel.
   Always touch yourself to ground while working on this panel to discharge any static charge built up in your body. (Micom model only)

(TROUBLE 1) The following visual conditions indicate a probable defective control circuit.

1. Incomplete segments.
   • Segment missing.
   • Partial segment missing.
   • Digit flickering (NOTE: Slight flickering is normal.)
2. Colon does not turn on or blink.
3. A distinct change in the brightness of one or more numbers in display.
4. One or more digits in the display are not lighting.
5. Display indicates a number different from one touched, for example, key in 5 and 3 appears in the display.
6. Specific numbers (for example 7 or 9) will not display when key pad is touched.
7. Display does not count down with time blinking or up with clock operation.
8. Display obviously jumps in time while counting down.
9. Display counts down too fast while cooking.
10. Each indicator light does not turn on after setting cooking cycle.
11. Display time of day does not reappear when cooking is finished.

(TROUBLE 2) Oven does not operate at all, Display window does not display any figures, and no input is accepted.

NOTE : All these switches must be replaced at the same time. Refer to page 5-7, 5-8

(TROUBLE 3) Display shows all figures set, but oven does not start cooking while desired program times are set and START pad is touched.

(TROUBLE 4) Oven seems to be operating but little heat is produced in oven load.

NOTE : Simple test of power output-conducted by heating one liter water for one min. if available. Minimum 8.5° C temperature rise is normal condition.

(TROUBLE 5) No microwave oscillation even though oven lamp and fan motor run. (Display operates properly)

NOTE :

• Make sure the wire leads correct position.
• When Removing the wire leads from the parts, be sure to grasp the connector, not the wires.
• When removing the magnetron, be sure to install the magnetron gasket in the correct position and in good condition.

References

• Repair Your Grill: Shop Replacement Parts for 24,880 Models
• Goldstar Microwave Parts - Select From 234 Models

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