Mono Level; Voltage Selector; Power Connection; Fuse - Mackie 1642VLZ4 Owner's Manual

16. Mono Level

If Mr. Mono's main mono mix is maxed, just reach for
this knob and turn it down a bit. Just the thing for send-
ing mono signals to mic inputs like camcorders, tele-
phone interface boxes, even answering machines. With
the pot all the way up (fully clockwise), you'll have 6 dB
of extra gain, and unity gain is at the 12 o'clock position.

17. Voltage Selector

WARNING: Before you plug the AC power
cord into the 1642VLZ4, you must make sure
that this slide switch is set to the same
voltage as the local AC mains supply. Only slide
the voltage switch with the power cord unplugged.
Use a flat headed screwdriver to slide the switch
if needed. The switch allows you to use the mixer in
different countries and voltages, meet interesting
people from other cultures, and entertain them.

18. Power Connection

Just in case you lose the cord provided with the
1642VLZ4, its power jack accepts a standard 3-prong
IEC cord like those found on most professional
recorders, musical instruments, and computers.
WARNING: Before you plug the AC power
cord into the 1642VLZ4, you must make sure
that the voltage selector [17] slide switch is
set to the same voltage as the local AC mains supply.
WARNING: Disconnecting the plug's ground
pin can be dangerous. Don't do it.

19. Fuse

The 1642VLZ4 is fused for your (and its own)
protection. If you suspect a blown fuse, disconnect
the power cord, pop out the fuse drawer with a small
flat screwdriver, and replace the fuse with a 1A SLO
BLO, 5x20mm, available at electronics stores or
your dealer (or a 500 mA SLO BLO 5x20 mm if
your 1642VLZ4 is set to 220V-240V).
If two fuses blow in a row, something is very wrong.
Please call our toll-free number 1-800-898-3211 from
within the U.S. (or call the distributor in your country)
and find out what to do.

20. Power Switch

Press the top of this rocker switch inwards to turn
on the mixer. The power led [21] on the top surface
of the mixer will glow with happiness, or at least it
will if you have the mixer plugged in to a suitable
live AC mains supply.
Press the bottom of this switch to put the mixer into
standby mode. It will not function, but the circuits are
still live. To remove AC power, either turn off the AC
mains supply, or unplug the power cord from the mixer
and the AC mains supply.
As a general guide, you should turn the mixer on
first, before the power amplifier or powered speakers,
and turn it off last. This will reduce the possibilities
of any turn-on, or turn-off thumps in the speakers.

21. Power LED

You've probably already
figured this out, but if the
power [20] switch is on, this
LED (light-emitting diode),
located in the output section,
will light. If the switch is off,
well, you get the idea. If the
power switch is on and the
LED does not glow, one of
three things has happened:
Somebody tripped over the
power cord and yanked
it from the outlet, your
electricity has been turned
off due to nonpayment, or
the fuse has blown.

22. Phantom Switch

This switch controls the phantom power supply
for all the mic inputs, as discussed on page 8.
When turned on (or off), the phantom power circuitry
takes a few moments for voltage to ramp up (or down).
This is perfectly normal. Make sure that you pull down
the master fader, and headphone/control room volume
before engaging the phantom switch.
23. 48V LED
This is just to let you know which way you have the
phantom [22] switch set. If your dynamic mics work
and your condensers don't, chances are this LED is off,
so turn the phantom switch on.
You'll notice that when you turn the phantom
power off, the LED stays on for a while. This is
a natural phenomenon — the LED is actually a
voltmeter telling you that the phantom power takes
time to ramp itself down to zero volts. So, if you've
turned phantom power off to connect something to
the mic inputs, wait until the LED stops glowing and
then make your connections safely.

24. BNC Lamp Socket

Located in the top right corner of the output
section, this 12V socket will drive any standard
BNC-type lamp (a Littlite® #12G or #12G-HI
(high-intensity), for instance).
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