Airwell SX 12 DCI, Service Manual

Page: 83 / 86

TROUBLESHOOTING
12-10
SM YAZ318 1-A.1 GB
12.5 Precaution, Advise and Notice Items
12.5.1 High voltage in Outdoor unit controller
Whole controller, including the wires, connected to the Outdoor unit controller may have the
potential hazard voltage when power is on. Touching the Outdoor unit controller may cause an
electrical shock.
Advise: Don’t touch the naked lead wire and don’t insert finger, conductor or anything else into
the controller when power is on.
12.5.2 Charged Capacitors
Three large-capacity electrolytic capacitors are used in the Outdoor unit controller. Therefore,
charging voltage (380VDC) remains after power down. Discharging takes about one minute
after turned off. Touching the Outdoor unit controller before discharging may cause an
electrical shock. When open the Outdoor unit controller cover, do not touch the soldering pin
by hand or by any conductive material.
Advise:
•
Open the Outdoor unit controller cover only after one minute from power off.
•
Measure the electrolytic capacitors voltage before farther checking controller.
Additional advises
•
When disassemble the controller or the front panel, turn off the power supply.
•
When connecting or disconnecting the connectors on the PCB, hold the whole housing,
do not pull the wire.
•
There are sharp fringes and sting on shell. Use gloves when disassemble the A/C
units.