Procedure Of Cheching Other Main Parts - Hitachi FSG Series Service Manual

1
TROUBLESHOOTING
90
1.3.6

PROCEDURE OF CHECHING OTHER MAIN PARTS

n High Voltage Discharge Work for Replacing Parts
%
DANGER:
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 "A" is ON
after start-up and "A" is OFF after turning OFF power
source, the voltage will decrease lower than DC50V.
b. Connect connecting wires to an electrical brazer.
d. Wait for 2 or 3 minutes and measure the voltage once
again. Check to ensure that no voltage is charged.
[Case 1]
Plug
Brazer
[Case 2]
c. Connect the wires to terminals, P and N on transistor
module. “Discharging is started, resulting in hot brazer.
Pay attention not to short-circuit between terminal P and N .
Manufacturing #
Before U4NG1001 LED3 on PCB5
After U4NG1002 LED2 on PCB3
Transistor
Connecting Module
wires
"A" Case
1
2