Peterson AutoStrobe 490 - Manual (Page 4)

Page 2
The initial screen during the power up phase is depicted here.
Line three shows the software revision number and line four the
serial number of the particular tuner.
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 490 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 490 responds to direct acoustic input through a built-in microphone which is active whenever the EXTERNAL
INPUT jack is empty. The jack permits input from an external microphone, electric guitars and basses, or any signal in
electrical form.
After you have checked the back of the Model 490 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.
PETERSON
MODEL 490 TUNER
REVISION X.XX
SERIAL # T490 XXXXX
NOTE: We advise that you write down the serial number shown on this initial screen and keep it with your records for
future reference in case anything should happen to your unit that would prevent this screen from appearing.
At the conclusion of the power-up tests, the strobe wheel will begin rotating and will flicker slightly due to random noise
in the room. The display panel will then change to the normal RUN screen as shown on the next page: