Peterson AutoStrobe 590 - Manual (Page 4)

Page 2
5) Completely remove the fuse from the unit.
6) Make sure the "Fuse Pull" lever is in the absolute far left position, completely clear of the Voltage Selection Card.
7) Insert the tip of a needle-nose pliers, scissors, or other suitable item through the small hole at the edge of the selection
card. (NOTE: if you believe that you will need to switch this card often, you might consider acquiring a special
extraction tool available from Peterson.)
8) Gently but firmly pry the card straight back and out of the fuse chamber by using the upper lip of the power entry/fuse
module as a leverage point and pushing on the upper part of the tool you've selected.
9) Flip or rotate the card so the proper voltage indication will be visible when the card is re-inserted (top, left).
10) Re-insert card by pushing firmly with fingers.
11) Reconfirm that the proper voltage selection is now the one that is visible on the card.
12) Push the "Fuse Pull" lever about halfway to the right and reinstall fuse (left end first).
13) Slide safety door back to the right.
14) Plug the tuner line cord into the power entry receptacle at the left.
Basic Operation: A Quick Tutorial
We will first give a summary of how to use the AutoStrobe 590 for basic tuning using the equal-tempered

scale and
A=440 Hz as the pitch reference. We follow later with detailed instructions on how to use the other features available on
the tuner.
The Model 590 has both audio-sensitive input (a built-in microphone which is active whenever the EXTERNAL INPUT jack
is empty) and audio output (a 3.5 mm jack for external headphones, a 1/4" EXTERNAL SPEAKER jack, and a built-in
speaker which is active whenever the headphone and EXTERNAL SPEAKER jacks are empty). The audio output allows
the Model 590 to function as a precision audio tuner or audio metronome. This output consists of an amplified version of
the audio input as well as a steady tone which reflects the exact "standard" frequency that the strobe tuner is currently using
as the reference pitch (as indicated by the OCTAVE knob at the top left of the front panel as well as the current temperament,
key, semi-tone scale note, "Concert A" pitch reference, and current global cents

(¢) deviation indicated on the tuner's LCD
display screen). The balance and overall volume of these audio outputs are controlled by the dual knobs (bottom ring and
top cap, respectively) at the left side of the front panel directly below the "OCTAVE" control knob.
NOTE: When the headphone jack is unused and a microphone—either built-in or external—is active, the balance control
(bottom ring knob of the VOL—BAL control) should ALWAYS be in the fully clockwise (internal tone only) position.
Otherwise an undesirable (you know the sound!) audio feedback condition can occur. When using a non-acoustic instrument
(an electric guitar or a band instrument fitted with the new "silent mute" technology, for example), turning the BALance
control counter-clockwise allows the Model 590 to function as a "practice amp". (High input levels will produce a distortion
sound familiar to electric guitarists and can be used to good effect!)
In addition, the volume control allows for very loud output (to be easily heard across a noisy room). It is good practice to
ensure the volume (outer cap knob) is turned low (counter-clockwise) before switching the Model 590 on since it will
begin producing its internally-generated audio tone soon after power-up.
The manual OCTAVE control mentioned above allows the standard-pitch, audio output tone to sound in any one of five
octave ranges. This permits the user to independently adjust the output tone relative to the sound to be tuned for the most
pleasing or functionally clear combination. All of the above manual front panel controls—VOLume, BALance, and
OCTAVE—also affect the sound of metronome "blips" when the Model 590 is configured to operate as a metronome.
After you have checked the back of the Model 590 as detailed above to verify that the voltage selector switch is set to the
correct position of 100, 120, 220, or 240 Volts AC, connect the line cord to an AC outlet receptacle, push the power switch
at the right of the strobe disc to the "up" position and follow these easy steps to use the tuner.