ETI PI-6000 Instruction Manual page 14

Electrical Test Instruments PI-6000
Section II - Detailed Description
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stainless-steel output bolts should rarely require replacement but may be
serviced by simply removing the sixteen screws on the phenolic output
faceplate, and then removing one of four bolt retainers. The standard hex head
bolts may then be pushed through and replaced. The bolt retainers for the
upper bolts in the lower plates are also the air core CTs.
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