Service manual

(TROUBLE 6) Microwave Output power is low.

First of all, check if output power is really low following “measurement of the microwave output

power”.

Condition Check Result Cause Remedy

Output power

is low.

Check the power

source voltage with

magnetron oscillating

Lower than

114 volts

Normal

Decrease in

power source

voltage

Customer education

Check the timing

periods of the RELAY

“1” coil

Abnormal

Defective touch

control circuit

Replace

Normal

Aging change

of magnetron

Replace depending

on the result of

output test

NOTE 2

NOTE2 : The following chart shows the timing periods of the RELAY “1”.

NOTE3 : Interlock monitor switch must be replaced when fuse is blown out.

POWER RELAY “1” ON TIME RELAY “1” OFF TIME

0 0 (Seconds) 29 (Seconds)

1 3 26

2 5 24

3 8 21

4 11 18

5 14 15

6 17 12

7 20 9

8 23 6

9 26 3

HI 29 0

NOTE 3