When the PR-4000 is used with the regulated PS-4000
mode power supply, a condition can exist where there will not be enough
output from the PS-4000 to satisfy the 24 vdc regululator in the
Further, when these two units are working together, there is no need
the VR in the PR-4000 as the PS-4000 has a regulated output. It is
when these two units work together that the 24V regulator on board the
PR-4000 be bypassed.
The 15vdc and 24vdc regulators are seen below (left
Notice the bypass strap installed on the 24vdc VR
This photo shows the strap in closeup.
Note that these regulators are the same adjustable type
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