D
：
Disconnect all the transformer connecters that connect to the main PCB. Then we can take off the transformer.
( As the pictures below show.)
Guidance of disassemble the Air valve.
A: Take off the PCB box cover. And we can see air valve. ( Refer to GUIDANCE OF CHANGE MAIN PCB.)
B
：
Slack and remove the screws fixing the air valve
2 locate of transformer connecters.
Locate of transformer wire
（
When
Instant back you may use wire connectors
）
Transformer has been taken off.
Locate air valve.
Locate the screws fixing air valve.
