Transcript ALL Warranties are subject to change, always verify.

2013 Microwave
Service Training
All models
Samsung HA Warranty
• ALL Warranties are subject to change, always verify.
• 1 Year Parts & Labor Base Warranty, Labor may not apply over 1 year
• Some items may have longer Warranties, Check Owners Manual or
800-SAMSUNG
– M/W oven 10 years on Magnetron Tubes
•
•
•
•
No Damage Warranty, Consumer or Stock
One Year, One Call for Consumer Education
Stock Repair, 18 months from date of manufacture
One Stock Repairs allowed under Warranty
Specialty Tools
Fine Point extended test
probes
Option 2 – safety pins
Specialty Tools
Wiring diagrams are
available on GSPN, they are
not with the product.
Check your tools
Do you have a M/W Survey Meter?
Check your Calibration Date?
Check if the leakage of microwave exceeds
5mW/cm2 before returning the oven to customers.
Fast Track Troubleshooting
1
2
3
Fast
Track
Manual
Example
page
Fast
Track
Manual
Example
page
Microwave Cooking Wattage Test
• Fill a 1000ml plastic room temperature container with cool tap
water, temperature of the water should be 55-65 degrees
• Stir water with a thermometer and record the water
temperature, remove thermometer.
• Place the container in the center of the lowest shelf or center of
the bottom of the microwave.
• For units less than 1550 watts, operate the oven on high for
exactly 63 seconds.
• Using the thermometer, stir the water to check the temperature
of the water.
• Subtract the starting temperature from the final temperature;
this will be the temperature rise.
• NOTE: Check line voltage under load, lower line voltage will
lower the power output.
Cooking Wattage Test
Chart
Temp Rise
Output
Temp Rise
Output
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
194
232
271
310
349
387
426
464
504
542
581
620
659
697
736
775
814
852
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
891
930
969
1007
1046
1085
1124
1162
1201
1240
1279
1317
1356
1395
1434
1472
1511
1550
The Basics of Microwaves
• Here is a quick check for the next “no heat” microwave repair.
• Check for the 120vac at the primary of the high voltage
transformer, in the cook mode. If you have no 120vac at the
transformer, the problem is in the low voltage section.
– Is L1 Missing, check the door switches & wiring.
– Is Neutral missing, verify the relay is activating on the main PCB &
Wiring.
• If there is 120vac at the primary, check the high voltage
transformer primary, & secondary resistances, the capacitor,
the diode, the magnetron tube, and loose or broken wires
• This procedure will keep you focused on the proper section,
low voltage/high voltage, and reduce service time.
Microwave is completely dead no interior light and no
display with line Voltage present at outlet.
Gain access to control panel by removing top grill. Test for 120vac at the
primary interlock switch (lower switch) or L1 at connector. Voltage present
indicates fuses and TCOs are good and problem is with the main control. No
voltage present proceed to testing of fuses and TCOs (Thermal Cut Outs)
CN201 pin 1
Primary interlock
Switch
SMH9187 PCB
Power here
means TCOs
and line fuse
are OK
SMH9187 PCB
RY203 closes the neutral line
to the HV x-former.
120vac between these
points, and the mag cooling
fan is running, means 120vac
to the HV x-former and main
board is OK.
Once the unit is removed from cabinet remove the case to access Magnetron
TCO . Remove top access panel to reach cavity TCO . Replace parts as needed.
Model specific component testing and location can be located in the service
manual found here on GSPN in the service manual.
Top View
Cavity TCO can be found at the
top in the area of light and
stirrer motor on all models
Mag TCO is N/C and will open at
approx 300 F and reset at approx
145 F . The Base and cavity TCO
are not resettable
FUSE
Access to the fuse and base TCO on most models can be gained through
opening when control panel is removed. Some units may have two fuses
and all units will have two lower TCOs. One is the Hood TCO and is N/O
(104/158 F) and the other is a Thermal Cut Out and is N/C (opens at 248F)
If both the fuse and TCO check good unit will have to be removed from
cabinet for further diagnosing to check Cavity and Magnetron TCOs .
CAUTION : Always be aware of capacitor location and discharge to prevent
electrical shock.
HOOD
BASE
FUSE
Note: Placement of lower TCOs
may very by model. Remember
one is N/O and the other N/C
Neutral is closed
because secondary
Sw is not activated
Blue
SMH9187 PCB
CN201
disconnected
removes
neutral from
the Lamp &
Fan circuits for
circuit check.
Secondary Interlock Switch
The door switches are 120vac.
Resistance can cause the circuit not
to work.
Test switch with an ohm meter, on
low resistance scale. Remove
switch, press the switch at least 20
times, if any resistance this means
the switch is bad.
Wiring Diagram Testing components, High Voltage
Danger High Voltage!!!
Transformer & Magnetron Testing
Remove wire leads
1. A resistance check between input terminals of the
magnetron indicates 0-1Ω or is normal, ∞ is an open
filament
2. A resistance check between the case of magnetron and
one of input terminals of magnetron indicates ∞ (unlimited)
is normal, any resistance is defective.
Capacitor and Diode Testing
High Voltage Capacitor
1. Check continuity of the capacitor with the meter set at the highest resistance scale.
2. Once the capacitor is charged, a normal capacitor shows continuity for a short time, and
then indicates 9MΩ.
3. A shorted capacitor will show continuous continuity.
4. An open capacitor will show 9MΩ constantly.
5. Resistance between each terminal and chassis
should read infinite.
High Voltage Diode
1. Isolate the diode from the circuit by disconnecting its leads.
2. With the ohm-meter set at the highest resistance scale, measure across the
diode terminals.
3. Reverse the meter leads and read the resistance.
A meter with 9V or higher voltage batteries should be used to check the frontto back resistance of the diode. (Put 9v battery in series with the meter)
(Otherwise, an infinite resistance may be read in both directions.).
4. The resistance of a normal diode will be infinite in one direction
and several hundred KΩ in the other direction.
Loose screw will cause arcing
Microwaves
• Unit stops working after 5 – 30 seconds
– Check for Fan blade off Mag tube cooling fan motor
• Order Motor/Blade
• Glue blade on shaft after roughing shaft
• Display has flashing and quits in a few seconds
• Check for Mag tube leaking
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