Opening the PR-11 Power Supply

Drill small hole in the cornor of the back cover

insert a small nail in the hole

bend the cornor of the back as shown below

bend back the (4) tabs in the case with cutters to release the back

Slide a knife under the cover

Work the knife down the cover to take it from the case.

remove the back
common fault is broken solder connection or voltage regulator
Did you check the inline fuse?
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