15
3-3 HV transformers replacement
Fig 3
‐
6 HV transformer mounted position
Two magnetrons are covered by metal covers to form a duct reduce the temperature of transformers,refer to
fig3
‐
6. There are two points need to note when maintenance engineer wants to take down the metal covers.
(1) It is no need for take down the fixed nuts, it is OK to unscrew,refer to fig 3
‐
7.
(2) two wiring resistors are installed on the surface of the metal cover,fixed nuts and
screws for mental cover need to be taken down, maintenance engineer should pay
more attention to the wiring layout and recover the wiring after replacement
Fig 3
‐
7 Fixed nuts
The first transformer is fixed like fig 3
‐
8, take down four fixed nuts and
disconnect the cord. We can do replacement process. Two HV
transformers are installed as the same way.
Wiring layout
We normally do not stipulate the input wiring way, that is to say live and
neutral cord can be connected with HV transformer randomly.
Make sure reliable grounding between HV transformer and chamber..
Fig 3
‐
8 HV transformer
The second HV transformer
The first HV transformer
Metal cover
16
TOPEX service manual
3-4 HV capacitor replacement
Fig 3
‐
9 HV capacitor mounted positon
Two HV capacitor are installed at the back side of the chamber, refer to fig 3
‐
9, both of them are fixed by a
metal bracket. It is relatively easy for replacement.
Wiring layout for HV components
Caution: Incorrect wiring may cause faults like fuse blown or no microwave generated.
Fig 3-10 Wiring layout
The first one
The second one