Peterson AutoStrobe 490ST - Manual (Page 3)

Page 1
THE ORGANIZATION OF THIS MANUAL
Congratulations on your purchase of the peterson AutoStrobe™ 490-ST strobe tuner. For your convenience, this
manual is organized into three major sections. The first, “The AutoStrobe 490-ST—At A Glance”, comprises just three short
pages of “must read” information that everyone should read before attempting to turn the Model 490-ST on and use it.
The next section, “The AutoStrobe 490-ST—In Depth”, provides detailed information about all controls and features
available in this device, how they are used, accessed, viewed, and manipulated.
The last section includes a glossary of terms used in this manual, two appendices with supporting background about some
of the exclusive capabilities of your AutoStrobe 490-ST, and an index of terms for easy access to specific areas of the manual
by subject. Terms found in the glossary first appear in the main sections of this manual with a superscripted “

” for
“glossary”.
THE AutoStrobe 490-ST—AT A GLANCE
1. INTRODUCTION
The peterson AutoStrobe™ 490-ST combines the best from over 40 years of strobe tuner technology with our latest
advances in automatic note detection, image stability/clarity, and alternate temperament/stretch

capabilities. We've
integrated the classic eight-octave strobe disc tuning system with precision digital microprocessor and motor control
technologies to provide a versatile tuner with unsurpassed accuracy and features. This instrument is designed for simple
“user-friendly” operation with little need to press buttons once the initial desired settings have been entered. It is the best
choice for music educators, musicians, manufacturers, and for any application where an accurate and versatile tuner is
required.
2. BEFORE TURNING IT ON: READ THIS SECTION!
OK, OK! We know you're all aflutter with anticipation, but it's really important (you can always tell by all the bold and
italics stuff!) to take care of a few details to avoid unintentionally wreaking some havoc. The following short sub-sections
will guide you through turning the AutoStrobe 490-ST on and using the basic features without damage to the unit or to your
ears!
IMPORTANT PRECAUTION: The Model 490-ST is designed to be used with 95-105V, 110-120V, 210-230, or 230-250V,
50/60 Hz AC power sources. IT IS VERY IMPORTANT FOR THE VOLTAGE SELECTOR CARD LOCATED IN THE
FUSE CASE AT THE BACK OF THE TUNER TO BE SET FOR THE PROPER VOLTAGE BEFORE PLUGGING
IN THE LINE CORD........... FAILURE TO DO SO MAY RESULT IN SEVERE DAMAGE TO THE INSTRUMENT!
Checking the AC Voltage Selection
1) First remove the power-line cord from the unit.
2) Slide the small, clear, plastic safety door of the power entry/fuse module completely to the left so as to expose the fuse
chamber.
3) A small fiberglass wafer or Voltage Selection Card is inserted horizontally just below the fuse and fuse-pull lever in this
chamber. The currently selected voltage setting (100, 120, 220, or 240) will be plainly visible in large, dark numerals
on this card. If the current selection matches the power-line voltage in your area, you do not need to change the
selection. Simply slide the plastic window back to the right and plug the tuner line cord into the power entry receptacle
at the left. You can even skip ahead over the next section—just remember that if you ever need to accommodate
different power line voltages, this next sub-section will guide you through it.
Changing the AC Voltage Selection
If the visible indication on the Voltage Selection Card does NOT match the power-line voltage in your area: