T&R Z-OVR, Operating And Maintenance Manual

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4. MAINTENANCE
Warning
The following actions should only be taken by suitably qualified
and competent service personnel. Before removing the unit from
its case, ensure that the unit is disconnected from the mains.
Under no circumstances connect the unit to the mains whilst it is
removed from its case.
4.1 Output Control Brushes
The output control brushes should be examined and replaced if necessary. The interval
between inspection and renewal of the brushes will depend upon the amount of usage
(particularly at very high currents). However, it should be remembered that damage to the
output control can result if the brushes are allowed to wear away to such an extent that a loss
of brush pressure occurs.
4.2 Removal of the Z-OVR from Case
To remove the instrument from its case, the following procedure should be used: -
a. Remove the 14 socket head screws securing each of the side panels to the unit (each
side has 4 screws to the rear, 4 screws to the front and 6 to each side).
b. Loosen the handles using socket head screws on front of unit.
c. Remove the side panels, being careful to disconnect the in-line plug and socket to the
cooling fan.
d. Lift the unit out of the U section case.