9 – 1
6HUYLFH0DQXDO
CHAPTER 9. CHECK IN THE EVENT OF NO MICROWAVE COOKING
Check of high voltage sections is very dangerous. Therefore, after the inverter boards (M and AC3) and 230 - 240V at the primary terminal are con-
firmed to be satisfactory, disconnect the main power and wait for at least one (1) minute before starting the check.
Check of individual components is done with the high voltage circuit wiring disconnected.
*1 Disconnect only the inverter unit terminals M and AC3. Then measure voltage between CN-A pins #1 and #3 (between PD 100 2P and 1P) with
an analog tester while performing heating operation.
*2 If a value measured by a digital tester is unstable, connect a resistor of 10 k to 100 k between the pins #1 and #3 to measure the value.
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
NO
NO
YES
NO
Check
(Inverter boards M, AC3, CN-A and F&FA, and magnetron F and FA)
(Function is normal.)
(Function is normal.)
(Function is not normal.)
(Function is not normal.)
Is there a voltage of 230 - 240V between the
primary terminal ends of the inverter unit?
Replace the control board.
Is there a voltage of about 0.4 - 0.5V DC between the
inverter CN-A pins #1(negative) and #3 (positive)?
*
1,
*
2
Adjust the latch base angle.
Check the secondary interlock switch.
In this case, check the high-voltage
diodes (D120 and D121) of the
inverter unit for a short circuit.
Replace the magnetron.
Check is finished.
Is the secondary interlock switch ON?
Is the fan motor running?
Is there a voltage of about 230 - 240V between
the fan motor terminal ends?
Replace the fan motor.
Is wiring on the high voltage side correct?
Have the terminals been completely inserted?
Correct the wiring.
Completely insert the harnesses.
Is there continuity between the magnetron terminals?
Is there a short circuit between the magnetron heater
terminal and any metal part of the magnetron body?
Are the magnetron cooling fins easily deformed?
Has the magnet cracked?
Replace the inverter board.
R-350Y(S)
To Next Page
Loading...
Need help?
General
