User manual

will have the least range, so the lowest volume will still be loud. If the range jumpers are
set for “Max”, the volume control when at the minimum will be very quiet. This allows the
volume to be tailored so that a fairly wide arc can be used in adjustment for track-to-
track amplitude variation.
The default factory setting is “Medium”. Make sure the Overdrive is powered-off for this
adjustment. The front panel and knob must be removed to access these.
4. Substation AC
The Substation provides three DC voltages to the Overdrive, +12VDC, +18VDC and –
18VDC. In standby mode, all voltages are powered in the Substation AC, but there is no
DC output. The three red LEDs should be on when the power cord is attached. The
Substation AC provides power sequencing to the Overdrive SE, so it should always be
powered using the front panel switch.
Danger: never connect the Umbilical to the Overdrive with the Substation power
on.
4.1. Substation Front Panel
The red LED indicators are:
top +12VDC
Middle –18VDC
Bottom +18VDC