Hitachi RAM-90QH5, Руководство по обслуживанию, Страница: 75 / 83

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1. Disconnect power plug.
2. Wait for 10 minutes or more after power is turned off and then remove electrical parts box lid. As shown below.
Apply soldering iron of 30-75W for 15 seconds or more to P1 and N1 black/white lead receptacles on Capa
board to discharge voltage from smoothing capacitor.
Do not loosen or remove screws of system power module: If screw is loose, voltage will not be discharged.
3. Before operation check of each part of circuit, remove receptacle of red/gray lead connected to ACT module
from diodde stack.
Caution
●
Voltage of about 360V is charged at both ends of smoothing capacitor 330
µ
F x 6.
●
High voltage (DC 360V) is also charged at terminal sections of ACT module and power module.
●
During continuity check of each circuit of electrical parts in outdoor unit is performed, to prevent
secondary trouble, disconnect red/gray wire connected to ACT module from diode stack. (Also be sure to
perform discharging of smoothing capacitor.)
Do not use soldering iron with
transformer: Doing so will blow thermal
fuse inside transformer.
As shown left, apply soldering iron to metal
parts TAB 01 P and TAB 02 terminals of
Capa board.
Discharge procedure and how to cut off power to power circuit
DANGER
W
ARNING
BLK
LEAD
WIRE
WRT
CAPACITOR BOARD
Sondering iron
Terminals of ACT module