Changing The Jumper Settings - RME Audio Multiface User Manual

35. Changing the Jumper Settings

The Multiface has internal jumpers, which allow to change input sensitivity and output level per
channel. More information on these settings can be found in chapter 25.1 and 25.2.
Please note that those jumpers are not thought of to be changed every day. They should be
changed when the unit is operated for the first time, so that it matches the Studio's operat-
ing level. Else only change them if it is really neccessary. The factory default +4 dBu will in
most cases offer perfect results.
To change the jumper settings the Multiface must be opened. If you feel unsecure to do so
please consult a technician and let him show you how to do it. Else please follow the instruc-
tions below step by step.
1. Remove all jacks and cables from the Multiface.
2. Loosen and remove both screws of the ADAT Sync D-sub socket.
3. Use a screwdriver (Phillips 1) to remove the 6 screws on the cover, and the upper middle
screw in the front panel of the Multiface, so that the cover can be taken off.
4. Put the device so that the front panel is in front of you. Lift the cover at the front by about
one centimeter (0.5 inch). Then pull the cover slowly about 2 centimeter (1 inch) in your direc-
tion. When doing so the TRS jacks and the D-Sub socket will slide out of the rear panel. The
cover is now freed from the rest of the housing and can be turned to the right.
Note: sometimes the PCB mounted underneath the cover prevents the cover from being lifted.
Shift the cover slightly to the right in such a case.
Use this unique moment and have a look at the internal design of the Multiface. On the right
side of the lower printed circuit board (PCB) you can see the two switching power supplies.
They generate both 5 Volts (for the digital circuitry) and ±13 Volts (for the analog circuitry) from
nearly every possible input voltage. In the center you'll see the heart of the Multiface, the Xilinx
FPGA. The analog circuitry and DA-converter for the headphone output is located on the right
from the FPGA. Left from the FPGA two Low Jitter PLLs can be seen. On the outer left side
you'll find 16 capacitors of the analog outputs and a 50-pin flat cable connector. The flat cable
connects lower and upper board, the latter being the analog board, which is mounted down-
under at the cover.
The analog board is covered from a thin metalized shield, preventing noise from digital circuitry
and flat cable being coupled into analog inputs and outputs. The shield is flexible and can be
bended up, so that the view onto the analog board gets free.
But now back to the jumper settings.
6. Bend the flexible shield carefully upwards. You'll now see the analog board with its 16 jump-
ers for level settings.
7. The jumpers controlling the sensitivity of the inputs are located directly behind each TRS
input jack. They allow three different settings: Left (middle plus left pin), right (middle plus right
pin), and without jumper. If the device is still placed with the front panel to the front, then Left
means +4 dBu (factory default), right means Lo Gain, and without jumper means –10 dBV.
8. The jumpers controlling the output level are located on the other side of the board, and are
placed in pairs. The jumper more near to the center of the board is the one of the even channel
(2/4/6/8). Again three settings are possible: Left (middle plus left pin), right (middle plus right
pin), and without jumper. If the device is still placed with the front panel to the front, then Left
means +4 dBu (factory default), right means Lo Gain, and without jumper means –10 dBV.
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User's Guide HDSP System Multiface © RME