Electronic Organ and Digital Piano Service
Electronic Organ and Digital Piano Service
While servicing Church Organs and Digital Pianos I am frequently being asked about Church Sound Systems. Since I have been around sound systems for years and have played in professional bands and in Church, I have picked up a fair amount of knowledge pertaining to sound systems and stage setups. I do not claim to be […]
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Background First of all I have over 30 years of experience playing in a band or group setting with other musicians. I have led Worship and currently play in a church Worship Team. In my business of repairing Organs and Digital Pianos I find myself in many churches having the opportunity to talk with many
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AO28 Layout AO28 Schematic General Description The AO-28 tube pre-amp is found in the Hammond B-3 as well as several other models. C-3, A-100, RT-3, D-100 etc. Designed in the fifties, this pre-amp remained in production until 1975. And, it remains fully functional and serviceable today. This discussion is designed to help owners do some
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Due to age and materials used in Hammond Organs, a common problem is the growth of tiny metallic hairs on metal surfaces. These hairs can shunt signals to ground causing problems. This happens in the manuals, in the percussion switches and in the preamp itself. This is also a common problem found in the Vibrato System.
Hammond Percussion Quick Fix Read More »
Table of Contents AO10 Layout AO10 Schematic General Description The AO-10 tube pre-amp is found in the Hammond B-2 as well as several other models. C-2, RT-2. Designed in the forties, this pre-amp remained in production until 1948. And, it remains fully functional and serviceable today. This discussion is designed to help owners do some
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Technical Description From Service Manual Each Hammond Organ Console has a main generator within it, and in some cases, depending on the model, a chorus generator. The main generator consist of the generator proper, a shaded pole induction motor for starting, a non-self-starting synchronous motor for driving the unit after starting, and a vibrato scanner mounted on the run
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General Description From the Service Manual: As a means of eliminating any vagrant harmonics that may be present, there are filters consisting of small transformers and condensers associated with certain frequencies. The transformers have a single tapped winding, and this tap is grounded, so one side, which is connected to the corresponding magnet coil through
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General Description From Service Manual: Associated with each tone wheel is a magnetized rod about 1/2 inch in diameter and 4 inches in length, with a coil of wire wound near one end. The tip of the magnet at the coil end is ground to a sharp edge and mounted near the edge of the
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General Description From Service Manual. Each tone wheel is a steel disc about two inches in diameter, accurately machined with a definite number of high and low points on it’s edge. Each high point on a tone wheel is called a tooth. the number of teeth on each of these tone wheels, in conjunction with
General Description The run motor is a non-self-starting synchronous motor. Rather than delivering a constant power, it delivers a series of pulsations, one for every half cycle. That would be two pulses per cycle and 120 pulses per second with a 60 cycle current source. RPM is 1200 for 60 cycle motors. 1500 for 50 Cycle. These motors do not usually have many
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