Brother PR600II Service Manual page 305

Failure Investigation for Electronic Parts The hoop sensor does not function normally.
Does the machine function normally when the Y
area sensor PCB is replaced with a reliable one?
Does the machine function normally when the
connect PCB is replaced with a reliable one?
From the previous page
N
Y
Change connect PCB.
Y
Change Y area sensor PCB.
N
Change main PCB.
5 - 23