HAMMOND ORGAN 2044 (01) PDF Document

The HAMMOND ORGAN 2044 features the following specifications:

Cabinet Size: 39 1/2 inches Wide, 21 inches Deep, 41 inches High (including music rack).

Weight (without bench): 125 lbs.

Power Required: 110 to 120 Volts, 60 Cycles, 80 Watts. Models are also available for 50 cycles and for 220 to 240 volts, 50-60 cycles.

Music Power Output: 15 Watts (per EIA Standard RS-234).

The organ is turned on by depressing the bottom of the switch at the extreme right on the control panel. A pilot light next to it glows when the organ is on. Pressing the top of the button turns the organ off.

Note that all tablets are in the Off position when the top of the tablet is depressed. To turn any of them On, depress the lower end of the tablet.

Melody is normally played on the keyboard with the right hand. The tone color or timbre of the melody is determined by depressing the voice control tablets, which may be used singly or in combination. At least one of these tablets must be depressed to produce sound from the keyboard.

When 8 foot tablets are used, the pitch will be the same frequency as the corresponding note on a piano. Using 16 foot tablets will result in a pitch one octave lower. A melody may be played in octaves by combining 8 foot and 16 foot tablets.

Accompaniment is played by the left hand using the chord buttons. Each button selects a full chord along with appropriate bass notes. Only one button should be played at a time.

The chord sounds softly when the chord button is depressed. Touching the rhythm bar with the left thumb or palm brings the chord up to full volume. Sustained soft chords can be eliminated by depressing the CHORD SUSTAIN CANCEL tablet, though chords will still sound at full volume when the rhythm bar is depressed. The tone quality of the chords can be mellowed by depressing the CHORD MUTE tablet.

The following table lists the frequency numbers connected to contact springs under chord buttons (viewed from the rear):

The two pedals are normally played with the left foot to produce deep bass notes. The pitch is determined by the chord buttons currently in use. The pedals play the root and fifth of the selected chord to provide variety.

The expression pedal is operated by the right foot and controls the overall loudness of the organ. Depressing the toe increases the volume, while depressing the heel decreases the volume.

Relative loudness is controlled by the KEYBOARD BALANCER and PEDAL BALANCER knobs located on the left of the control panel. Turning these knobs clockwise brings out the melody or pedals in relation to the chord buttons. For normal operation, turn them so the white dots point up.

Reverberation adds a concert hall effect. Use the REVERBERATION control to regulate this: the effect is least in the fully counter-clockwise position and increases as the control is turned clockwise.

The VOLUME SOFT tablet can be used to reduce the overall loudness of the instrument when full power is not desired.

Cleaning Keys and Control Tablets: Clean plastic keys and tablets lightly with a soft, damp cloth or chamois. If necessary, use pure facial soap and lukewarm water. Do not use boiling water or strong solvents like alcohol, dry cleaning fluids, or window cleaners. Avoid wiping with a dry cloth as it builds up an electrostatic charge that attracts dust.

Cleaning Woodwork: Dust with a soft, damp cloth. For cleaning, use a solution of mild soap and lukewarm water, then remove the solution with a clean, damp cloth. Dry thoroughly by rubbing with the grain. Use a high-grade liquid furniture wax or polish, but avoid paste waxes or oil-type polishes. Do not rub excessively in one spot.

Dust or dirt on contact surfaces can cause poor circuit connections. Sometimes this can be dislodged by striking the key, button, or tablet 15 to 20 times in a rapid staccato manner.

For deeper cleaning:

1. Control Panel and Pedal Switches: Wipe gently with the corner of a small piece of stiff paper. In extreme cases, use a burnishing tool or very fine sandpaper (never use emery cloth).

2. Keyboard Contacts: Use the same method as control panel switches, but avoid metal tools or sandpaper to prevent removing the gold plating.

3. Chord Button Switches: Contacts at the ends can be cleaned similarly, but inner ones are difficult to reach. If necessary, rub a contact clean by unhooking the bent end of a busbar and sliding it endwise a short distance while holding down the button.

To replace the pilot lamp, follow these steps:

Step 1. Unscrew the red plastic cap.

Step 2. Unscrew the old lamp.

Step 3. Insert a new #765 lamp. This lamp is rated at 7 volts, .065 amp.

The gain adjustment (R322) typically does not require changing after factory setting. To reset it:

Step 1. Depress the expression pedal all the way.

Step 2. Set the REVERBERATION control to its maximum counter-clockwise position.

Step 3. Depress the lower end of the VIBRATO CANCEL tablet and leave all other tablets in the Off position.

Step 4. Connect an AC voltmeter to the voice coil terminals of the speaker.

Step 5. While holding down the C MAJOR chord button, turn the gain adjustment control until the voltmeter reads 0.6 volts.

Tuning should only be performed using an electronic indicator and the following procedure:

Step 1. Check the -12 volt adjustment before starting.

Step 2. Turn off vibrato (depress VIBRATO CANCEL) and reverberation (turn control fully counter-clockwise).

Step 3. Use only the 8 foot FLUTE voice control tablet.

Step 4. Use notes of the highest octave possible.

Step 5. Adjust the pitch by moving the core of L101 on the proper generator. The core can be moved with the fingers by twisting it as it is pushed or pulled. Tuning the twelve notes within the highest octave will tune the entire organ.

If the entire instrument is dead:

1. If the pilot light does not come on, check the power outlet.

2. If the pilot light is on, check the rectifier (V307) and power amplifier (V304, V305, V306) circuitry.

If the sound is weak or distorted:

1. Check the preamp (V301, V302) and power amplifier circuitry.

2. Check the setting of the gain adjustment.

3. Check for a worn expression control (R501).

4. Check the -12 volt adjustment.

If notes are missing when chord buttons are played:

1. Clean chord contact springs and chord busbars.

2. Check tone generator circuitry.

If octaves are out of tune:

1. Check the -12 volt adjustment.

2. Check tone generator circuitry, especially R106, R107, and R113.

If the entire organ is out of tune:

1. Check the -12 volt adjustment.

2. Perform the retuning procedure.

Earphones can be connected to the receptacle on the amplifier where the speaker voice coil is attached. A resistor of 6 to 10 ohms, with a power rating of at least 10 watts, must be connected across the speaker output receptacle whenever the speaker is disconnected. A circuit transfer jack can be used to disconnect the speaker and connect the resistor automatically when earphones are plugged in.

The following table provides the frequencies in cycles per second for various notes: