Hammond Model A, Manual, Page: 278 / 298

4-5. ALIGNMENT OF COIL ASSEMBLIES.
4-6. Each magnet and coil for each tone wheel is mounted in the tone generator as a
single assembly. (See figures 2 & 3 in Main Generator section.) To locate and
determine which coil assemblies require alignment, proceed as follows:
a. Remove the console rear panel.
b. Connect an output voltmeter (1,000 ohms per volt scale) across the two
terminals marked G.
c. Set both the vibrato controls, and all percussion tablets, to their OFF
positions.
d. Depress the swell pedal to the position of maximum volume.
e. Disconnect tone cabinet from console.
f. Connect one end of a test lead to the 5 preset panel busbar, from the
th
bottom.
g. Place the organ in operation.
h. Check the AC input voltage at the console preamplifier terminal board;
the voltage should be 117 volts or 234 volts. Any variation of input supply voltage
will give a corresponding increase or decrease of reading. as shown in
Table V.
i. Check the output voltage of each coil assembly by touching the prod end
of the test lead to each terminal in turn on the main generator terminal board. The
frequency numbers are not indicated. For location of exact frequency, see figure 5
or 6 in the Main Generator section.
j. Compare each voltage obtained with the appropriate voltage listed in
Table V. Do not try to adjust to these voltages unless the values deviate more than
30 percent.
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