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1. Inspection Before Overhaul
1.1. Check if the line voltage on the single-phase power supply is within the range of
360V - 440V and, that all phases on a three-phase system are intact.
1.2. Check if the power cable as well as the earth wire is firmly connected.
1.3. Check whether the wiring connections are correct and firmly connected.
2. Common Machine Problems and Troubleshooting
No.
Problem
Root cause
What to do
1
The “machine-on”
light is off. No
digital display. Fan
doesn’t work. No
no-load output.
Power switch was turned off
or damaged
Check or replace the
power switch
Power supply phase missing
Check power input if phase
loss
Whether there is electricity in
the grid connected to the
output cable
Check the grid voltage
Filter capacitor and bridge
rectifier have been damaged,
resulting in failure to start the
machine
Replace filter capacitor
and bridge rectifier
Control board damaged
Replace control board
2
No digital display
or the ''machine
on'' light not
active. Fan
operational. No
load output.
Digital display meter
damaged.
Replace meter or indicator
light.
Loose wire connection.
Check and reconnect the
wire.
Control board damaged.
Check problem on control
board or replace control
board.