REAR PANEL DESCRIPTION
1. A AND B INPUT CONNECTORS.
Use these 3-pin input connectors for either
microphone or line level inputs to be split by the FPS 28. Connect balanced sources to the
respective “+”, “–” and “GND” pins which are pins 2, 3 and 1 respectively. Unbalanced in-
puts should connect to pins 2 and 1 only. When using an unbalanced input, pin 3 may be left
open or shorted to “GND”.
2. EXPAND OUTPUTS.
These two tip-ring-sleeve 1/4" jacks directly parallel pins 1, 2 and 3
of the three pin input connectors. The tip is connected to pin 2, the ring goes to pin 3 and
sleeve jumpers to pin 1. These are to be used in situations where more than a stereo 4-way or
mono 8-way split is required from the same source(s). When expanding to one more FPS 28,
a 1/4" to 1/4" patch may be made. The expand input may also be used as a primary input.
3. MIC /LINE SELECTOR SWITCH.
In the out position, the respective input stage is set
for microphone input levels. In the depressed position, line level signals are accepted.
4. OUTPUT JACKS.
These four 1/4" tip-ring-sleeve jacks provide all eight outputs of the
FPS 28. Each contains a pair of signals, Bus A is on the tip and Bus B is on the ring. Sleeve is
signal ground.
5. GROUND LIFT SWITCH.
This switch provides the ability to separate chassis ground
and signal ground. Normally, this switch should be in the LIFT position. In some circumstan-
ces it may be necessary to move it to the opposite position to eliminate stubborn hum and
buzz problems. We realize a scientific explanation of this switch would be helpful, unfor-
tunately science doesn’t seem to have much to do with it. See the
CHASSIS GROUNDING
note on the last page for details.
If you are tempted to try moving this switch with your power amplifiers turned on or turned
up, DON’T BE. ALWAYS TURN YOUR AMPLIFIER LEVELS DOWN BEFORE
CHANGING YOUR GROUNDS AROUND and then bring them up slowly.
6. POWER INPUT CONNECTOR
USE ONLY A MODEL RS 1, FRS 8, OR OTHER
REMOTE AC POWER SUPPLY APPROVED BY RANE. The FPS 28 is supplied with a
remote power supply suitable for connection to this input jack. Consult the factory for re-
placement or substitution.
7. CHASSIS GROUND POINT.
A 6-32 threaded hole used for chassis grounding purposes.
See the CHASSIS GROUNDING note on the last page for details.
FPS 28 TOP-REAR COVER REMOVAL PROCEDURE:
To gain access to the internally mounted PRE/POST switches, remove the top/rear cover
following this procedure:
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1. Remove the five phillips screws securing the top cover to the chassis, using a #2
phillips screwdriver.
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2. Slide the top/rear panel to the rear and off of the chassis.
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3. To replace the top/rear cover, reverse the above procedure.
