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Maintenance procedure for the power supply part is as follows:
Measure if there is any voltage at
the power supply input rectification
unit.
Check if the switch tube is
defective or not.
The rectifying diodes are broken.
Replace them.
Replace the switch tube of the
power supply.
Measure the output voltage of the
switch transformer to find out if it
is normal or not.
Check the power board part.
The transformer is broken.
YES
NO
YES
YES
YES
NO
YES
NO
NO
NO
YES
NO
No reaction when the machine is
turned on, then check if the
external voltage complies with
the requirements.
Check the voltage of the power
supply.
Open the casing to check if the
safety fuse is all right.
Replace it with a new safety fuse of
the same model (note: the power plug
must be disconnected.).
Check if the power supply switch
is all right. Replace the power supply switch.
YES
