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General| Type | Tonewheel Organ |
|---|---|
| Manuals | 2 |
| Presets | Yes |
| Vibrato | Yes |
| Vibrato/Chorus | Yes |
| Percussion | Yes |
| Reverb | No |
| Manufacturer | Hammond |
| Keyboards | 2 x 61-note |
| Pedalboard | 13 keys |
| Tone Generation | Tonewheel |
| Amplifier | Built-in |
| Speaker | Built-in |
Details on how the revised manual was created by scanning and OCR processing.
Lists the revisions made to the service manual over time, including dates and comments.
Provides specifications for document typesetting, page sizes, and layout formats.
Overview of the L-100 Series organs and their operating principles.
Explanation of the Hammond tone-producing mechanism using tone wheels and harmonic drawbars.
Details on the synchronous motor driving the tone generator and the power switch.
Description of the main generator assembly, tone wheels, and frequency generation.
Information regarding the organ manuals, keys, contact springs, and busbars.
Explanation of how drawbars control harmonic intensity and tone color.
Function of the center drawbar for adjusting pedal volume.
Description of the 13-note pedal keyboard and its connection to generator frequencies.
Operation of the expression (swell) pedal for volume control.
Overview of the 17 tabs that change the instrument's operation.
Description of the preset tabs for selecting drawbar or preset tones.
Explanation of the tabs that control vibrato effect and chorus.
Details on reverberation control and the overall volume soft tab.
Function of percussion tabs for tone decay, volume, and harmonic selection.
Description of the L-100A's added percussion effects and controls.
Details on the six-voice percussion feature and its controls.
Information on connecting extension speakers, external inputs, and earphones.
Guidance on using a Hammond Model PR-40 Tone Cabinet as an extension speaker.
Instructions for connecting external sound sources like record players or radios.
Details on the adapter circuit and requirements for using earphones.
Overview of the amplifier chassis and percussion attachments in L-100 series.
Explanation of the preamplifier's role in receiving signals from drawbars and percussion tabs.
Detailed description of the vibrato system, phase shifting, and components.
Explanation of the percussion amplifier's function and signal path.
Description of the reverberation and power amplifier stages and their function.
Details on the organ's power supply circuit, including rectifier and filtering.
Explanation of the L-100A percussion voicing circuitry, including mode switch.
Description of the frequency divider used for the 'Chime' voice.
Explanation of the Cymbal-Brush switch and its effect on keying functions.
Details on how the Brush effect is keyed via the 8th harmonic busbar.
Explanation of how the Cymbal effect is activated by pedal keying.
Description of the amplification stages for Brush and Cymbal effects.
Overview of the L-100-1 six-voice percussion circuitry and its power supply.
Explanation of the push button circuits that activate percussion voices.
Details on the keying circuits for the lower manual.
Explanation of the pedal keying circuit for activating voices.
Introduction to disassembly techniques specific to L-100 Series organs.
Information on accessing parts by removing the organ top, back, or both.
Step-by-step instructions for removing keys from the upper manual.
Step-by-step instructions for removing keys from the lower manual.
Procedure for removing a drawbar contact spring.
Instructions for removing drawbars, knobs, or the entire drawbar assembly.
Detailed steps for removing the upper manual assembly from the organ.
Detailed steps for removing the lower manual assembly from the organ.
Procedure for disconnecting and removing the tone generator assembly.
Instructions for removing the motor from the generator assembly.
Steps for removing the pedal keyboard assembly.
Procedure for removing the swell assembly and its components.
Instructions on how to replace a broken control tab.
Procedure for replacing the pilot light bulb or the power switch.
Information on accessing and removing the L-100A percussion circuitry.
Details on locating and accessing the six-voice percussion circuitry.
Introduction to performance standards, adjustment procedures, and troubleshooting.
Procedure for checking the organ's performance and settings.
Lists the necessary test equipment for service checks.
Step-by-step instructions for performing performance checks and adjustments.
Procedure for checking the vibrato effect using an oscilloscope or listening test.
Guide for checking the performance of the L-100A percussion unit.
Checks and troubleshooting steps for the L-100-1 six-voice percussion system.
Troubleshooting steps for missing notes or harmonics on a key.
Introduction to schematic diagrams for organ servicing.
Guidance on using layers in PDF schematics for viewing component differences.
Introduction to the parts list for L-Series organs.
Information about the source document and how to obtain a copy.
Description of how the parts list is organized by assembly.
Guidance on how to use the Assembly and Parts List tables.
A list of assemblies referenced in the parts lists, with part numbers.
A comprehensive list of all parts used in the L-Series organs.
Introduction to aftermarket modifications and improvements for the L-100.
Instructions for connecting external speakers, including an alternative line-out circuit.
Steps for connecting a Leslie using a specific adapter and cable.
Listing of external resources for Hammond modifications.
Template for adding modifications to the right-hand end-panel.
Modification to improve chorus tone and add control over depth.
Modification to improve percussion tone, volume, and attack.
Modification to add more treble and mid-range frequencies.
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