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Electronic Parts
Failure Investigation
for Electronic Parts
Power does not come on
When the power is turned on, nothing appears on the LCD
and the buzzer does not sound.
*
In case of models not equipped with the start/stop button.
When the power is turned on, nothing appears on the LCD.
Replace the main PCB assy.
Y
Connect the power supply
cord correctly or replace it.
Replace the inlet assy.
N
Is the power supply cord free from
damage and connected correctly?
Y
N
Y
Y
N
Replace the power supply
PCB assy.
Replace the power lead wire assy.
N
Is the resistance between pin 1 and
1, 2 and 2, 3 and 3, 4 and 4, 5 and
5 at the power lead wire assy. 1Ω
or less?
When the inlet assy. connector is
disconnected from the power supply
PCB assy. and the power is turned
on, is the voltage between pins
120V AC?
When the power lead wire assy. is
disconnected from the power supply
PCB assy. connector (CN201), is
the voltage between pin 2 and 3, 4
and 3 normal?
• Between pin 2 and 3 : 5V DC
• Between pin 4 and 3 : 30V DC
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