Brother PR600 Service Manual page 246

Failure Investigation for Electronic Parts The power is not turned on.
From the previous page
5 - 4
From the previous page
When the power cord is removed from the inlet and
the power lead is removed from the power PCB, is
the resistance between the inlet and the power lead
connector 1Ω or below when the switch is ON and
when it is OFF (check both terminals)?
Y
Does the machine function normally when the
power PCB is replaced with a reliable one?
N
Does the machine function normally when
the main PCB is replaced with a reliable one?
N
Does the machine function normally when the
panel PCB is replaced with a reliable one?
N
Does the machine function normally when the
inverter PCB is replaced with a reliable one?
N
Is lead A on the panel properly
connected to connector CN9 on the
panel PCB?
Y
Is the resistance between each pin at both ends
1Ω or below when leads A and B on the panel are
removed from the main PCB and the panel PCB?
Y
To the next page
N
Change power switch
assemblies and power leads.
Y
Change power PCB.
Y
Change main PCB.
Y
Change panel PCB.
Y
Change inverter PCB.
N
Connect it properly.
N
Change leads A and B on the panel.