Yamaha Harmony Director HD-200 Owner's Manual page 24

Initializing
Hold down both the DATA ENTRY [+] and [-] buttons, and press the [STANDBY/ON] switch to turn on the power.
"Memory is Initialized!" appears on the HARMONY display and all the settings are reset to the factory default values.
Because initialization will erase all User Temperament and Metronome settings, it is recommended that you note
down any settings on the Blank Chart on page 21.
Error Messages
If an error occurs, a message will appear on the display. Use the following chart to confirm the problem and find an
appropriate solution.
Message
Low Battery !
Low Backup Battery !
Memory is Initialized !
Keyboard Error !
Keyboard Data Error !
About the Preset Temperaments
Calculating Pitch
What is a Cent?
A cent is a unit used to measure pitch that equals 1/100th of a semitone. Using cents to measure pitch, we can cal-
culate the pitch using simple addition/subtraction rather than multiplication/division. For this reason, the cent is
commonly used in music and acoustics as a standard for measuring pitch.
1200
(Cent Value) =
log2
(Pitch Ratio) = 10
Temperaments Included in the HD-200
Equal Temperament
Pure Major
Pure Minor
19
Cause
Battery power is low.
The lithium backup battery power is low.
There is an irregularity in the memory
backup data.
The instrument's data is reset to factory
defaults.
The keyboard may be malfunctioning.
× log (Pitch Ratio)
log2
× (Cent Value)
1200
In an equal temperament, the octave is divided into 12 equal steps (equal frequency ratios).
The frequency ratio between neighboring notes is
usually tuned relative to a standard pitch of 440Hz.
This tuning preserves the pure mathematical intervals of the major scale, especially for the
triad chords. This tuning includes pure fifths and thirds, both large and small interval whole
tones, and chromatic scale semi-tones, so changing keys requires changing the pitch ratio of
every note in the scale, making it impractical for keyboard or fretted instruments.
Like the pure major, this tuning preserves the pure mathematical intervals of the minor
scale. Changing keys also requires changing the pitch of every note in the scale, making it
impractical for keyboard or fretted instruments.
Solution
Replace all batteries.
Contact the dealer from whom you purchased
the instrument and have the battery replaced.
Contact the dealer from whom you purchased
the instrument.
Contact the dealer from whom you purchased
the instrument.
12
(1.0594631). This temperament is
2