1-111
TROUBLESHOOTING
1.3.6 Procedure of Checking Other Main Parts
(1) High Voltage Discharge Work for Replacing Parts
<Perform this high voltage discharge work to avoid an electric shock.>
Procedure
(a) Turn OFF the main switches and wait for three minutes. Check to ensure that no high voltage
exists. If LED3 (5 to 20HP) or LED201 (24 and 30HP) is ON after start-up and LED3 (5 to 20HP)
or LED201 (24 and 30HP) is OFF after turning OFF power source, the voltage will decrease lower
than DC50V.
(b) Connect connecting wires to an electrical brazer.
(c) Connect the wires to terminals, P and N on transistor module (5 to 20HP) or ISPM (24 and 30HP).
=> Discharging is started, resulting in hot brazer. Pay attention not to short-circuit between
terminal P and N .
(d) Wait for 2 or 3 minutes and measure the voltage once again. Check to ensure that no voltage is
charged.
Power Supply Manufacturing # "A" Case
Before U4NG1001 (FSG/FS3) LED3 on PCB5 1
After U4NG1002 (FSG/FS3)
From the First Production (FXG/FX3)
220V/60Hz From the First Production (FSG/FS3) LED2 on PCB3 3
380-415V/50Hz
380V/60Hz
LED2 on PCB3 2
TB3
RS W
RB
VTU
NPD P
TB2
R216
R215
ZN20
LED201
ZN202
R201
R200
CN207 CN206
CN9
PC207
C
PC208
CN8
RB
N
P
P1
Brazer
Plug
N
P
Connecting
Wires
LED201
ISPM
In Case of 24 and 30HP
In Case of 5 to 20HP
Brazer
Plug
Connecting
Wires
P
B
N
U
V
W
Transistor
Module
<Case 1>
<Case 2 and 3>
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