Toa SX-2000 Series Installation - Manual (Page 93)

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2.6.4. ground lifting using the vp-200vX power Amplifier Input Module
When operating the system, hum noise may be generated by a ground loop accidentally created in the system.
the ground loop can be cut off with the Ground lift jumper connector setting on the VP-200VX board.
to access the Ground lift jumper connector, take out the internal VP-200VX from the VP amplifier.
make sure that the system power is switched off before starting the work.
for procedures regarding switching off the system power, refer to the Instruction manual attached to
the VX-2000DS/3000DS.
Step 1. Remove the VP amplifier's top panel.
refer to p. 89, "Removing the VP Power Amplifier’s top panel"
Step 2. take out the VP-200VX.
Step 3. unplug the jumper socket and plug it to the lIft position on the VP-200VX board as shown below.
Step 4. fit the VP-200VX back into place.
Step 5. replace the top panel.
LIFT
LIFT
LIFT
[VP-200VX]
Factory-preset position
Ground Lift position
wARNINg