D-2
Lexicon 480L Owner's Manual
Voltage changeover is a fast and easy process:
1. Remove the power cable from the 480L.
2. Insert a small flat-bladed screwdriver or an IC
puller into the slot next to the fuseholder cartridge,
which is located just to the right of the power connector.
Pry the cartridge out so that it drops out of the chassis.
Set the fuseholder cartridge aside.
3. The voltage changeover board is mounted ver-
tically in a small compartment which is normally cov-
ered by the fuseholder cartridge (which you removed in
step 2). Remove the board with a pair of needle-nosed
pliers or tweezers.
4. The four sides of the board are marked with the four
voltages at which the 480L can be operated (100, 120,
200, 240). Slide the voltage changeover pin around
until it fits in the notch opposite the side marked with the
operating voltage you require.
5. With the pin facing out, replace the board in the
chassis. Press it until it snaps into place or fits firmly in
its socket.
6. The fuseholder cartridge is supplied with two sets
of fuses—a single 3 A, 3AG Slo-blo fuse for 100/120 V,
and two 1.5 A 20-mm Slo-blo fuses for 220/240 V. To
change the fuses over to 220/240 V, remove the small
Phillips-head screw on the cartridge, and turn over the
board. Reinstall the screw. The European 20-mm
fuses should now be visible.
Reverse the process to change from 220/240 V to 100/
120 V operation.
7. Reinstall the fuseholder cartridge. Check the pin
indicator to verify that you selected the correct voltage.
If none of the holes in the fuseholder line up with the pin
on the voltage changeover board, you installed the
board upside down. Reinstall it correctly and try the
fuseholder again.
8. This completes the voltage changeover.
Some applications require that the 480L operate under
adverse electrical conditions. In these situations, it
may be beneficial to transformer-couple the 480L's
audio inputs and outputs. The 480L allows easy instal-
lation of audio transformers inside the unit. Please note
that transformers are not available from Lexicon. They
can be purchased directly from their manufacturer or a
pro audio dealer.
If you choose to install transformers, follow these
instructions carefully.
For the 480L inputs, we recommend Jensen JE-11P-1
transformers.
1. On the main circuit board (component side) of the
480L, cut the etch between E4 and E7, E5 and E8, E10
and E13, E11 and E14.
2. Install a 510 pF 2.5% polypropylene capacitor at
C143.
3. Install a 510 pF 2.5% polypropylene capacitor at
C183.
4. Install a 15 kilohm, 1% resistor at R152.
5. Install a 15 kilohm, 1% resistor at R187.
6. Connect a Jensen JE-11P-1 transformer as fol-
lows for the left channel:
480L Transformer
E3 White
E4 Brown
E5 Red
E6 Black
E7 Orange
E8 Yellow
7. Connect a Jensen JE-11P-1 transformer as fol-
lows for the right channel:
480L Transformer
E9 White
E10 Brown
E11 Red
E12 Black
E13 Orange
E14 Yellow
Voltage Changeover Installing the
Optional Transformers
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