Tech Sheet

FOR SERVICE TECHNICIAN’S USE ONLY
Components Test/Results
AC Line Filter 1. Unplug microwave oven or disconnect power.
2. Remove wire leads.
3. Measure resistance:
■ Normal: L(1) to L(2) (coil): Less than 1 ohm;
N(1) to N(2) (coil): Less than 1 ohm
■ Abnormal: Innite
■ Normal: L(1) or L(2) to N(1) or N(2) (resistor): 1.5M ohms
■ Abnormal: 0 ohms
Switching Power Supply
1. Check AC power into CN101.
■ If none, check main harness.
2. Check DC power across CN201 (DC24V).
■ If none, replace Switching Power Supply Unit
3. Check for DC power from Switching Power Supply Unit to PSU/CPU
■ If none, check main harness
For patent information, please see Pat. www.patent-listing.com
W11101482B
NOTE: This sheet contains important Technical Service Data.
FOR SERVICE TECHNICIAN ONLY
DO NOT REMOVE OR DESTROY
08/17
FOR SERVICE TECHNICIAN’S USE ONLY
W11101482B
TINSEB552MRR0
©2017 All rights reserved.
6
H.V. Capacitor
1. Unplug microwave oven or disconnect power.
2. Remove wire leads.
3. Prepare the DC 9-volt battery and 10k ohms resistance including wire leads.
4. Connect the DC 9-volt battery to the H.V. capacitor.
5. Measure resistance:
■ Terminal to terminal: Normal: 9 volts (approximate); Abnormal: 0 volts (approximate)
■ Terminal to case: Normal: 0 volts (approximate); Abnormal: 0 volts (approximate)
H.V. Diode
NOTE: Some inexpensive ohmmeters do not have a 9-volt battery incorporated in them, and may
indicate infinite resistance in both directions when testing the diode. It is recommended that you use an
ohmmeter with a 9-volt battery on the 10x scale to properly test the H.V. diode.
1. Unplug microwave oven or disconnect power.
2. For ohmmeters without a 9-volt battery, prepare the DC 9-volt battery and 10k ohms resistor in
series including wire leads.
3. Connect the DC 9-volt battery to the H.V. diode.
4. Measure continuity:
■ Forward: Normal: 5 to 6 volts (approximate); Abnormal: Open—9 volts (approximate); Short—0
volts (approximate)
■ Reverse: Normal: 9 volts (approximate); Abnormal: Open—9 volts (approximate); Short—0 volts
(approximate)
Stirrer Motor
1. Unplug microwave oven or disconnect power.
2. Remove wire leads.
3. Measure resistance:
■ Normal: 3.8k ± 0.2k ohms (approximate)
■ Abnormal: Infinite
Cooling Fan Motor
1. Unplug microwave oven or disconnect power.
2. Remove wire leads.
3. Measure resistance:
■ Normal:
A 95 to 120 ohms (approximate)
B 10 to 25 ohms (approximate
■ Abnormal: Infinite
AC Line Filter
1. Unplug microwave oven or disconnect power.
2. Remove wire leads.
3. Measure resistance:
■ Normal: L(1) to L(2) (coil): Less than 1 ohm;
N(1) to N(2) (coil): Less than 1 ohm
■ Abnormal: Infinite
■ Normal: L(1) or L(2) to N(1) or N(2) (resistor): 1.5M ohms
■ Abnormal: 0 ohms
Components Test/Results
SWITCHING POWER SUPPLY TEST
1.
2.
Check AC power into CN101,
if none check Main Harness.
Check DC power across CN201 (DC24V),
if none replace Switching Power Supply Unit
3. Check for DC getting from Switching Power Supply Unit
to PSU/ CPU, if none check Main Harness.
CN201
CN101