Hammond Model A, Manual, Page: 293 / 298

e. Use small wooden blocks to raise and support the entire console a few inches
off the floor to provide the necessary clearance for the removal of the pedal switch
assembly.
f. Loosen and remove the screws which hold the wiring tube (through which the
pedal wiring cable passes to the tone generator) to the console shelf, the 3
oval-head and 1 hexagonal head screws which hold the pedal switch in place, and the
screw which holds the swell pedal rod in place.
g. Lift the cover board and remove the screws which hold the pedal switch
assembly to the back rail of the console.
h. Loosen the large bolt at each end of the pedal switch assembly then remove
the nuts attached to these bolts. Drop the assembly carefully and remove it.
i. Install a replacement pedal switch assembly in place by reversing the
procedures above.
5-78. MANUAL CHASSIS.
5-79. Replacement of manual chassis will be accomplished as follows:
a. Remove the rear panel of the console.
b. Remove the four screws on the left and right hand side panels of the music
rack.
c. Lift the side panels to tilt the bottom of the rack. and then remove the
rack by pulling outward.
d. Remove the 4 chassis bolts (under the console) and the 2 machine screws
(under the front lower rail) that secure the entire manual chassis in place.
e. Disconnect all preamplifier leads.
f. Loosen set screw in expression control lever arm and detach arm from
preamplifier.
g. Remove preamplifier from shelf after taking
out mounting screws.
h. Unsolder (do not cut) the 79 manual leads, 2 ground leads, 3 pedal signal
leads (red, orange, and yellow). and the pedal filter leads (brown and black).
i. At the power terminal panel, unsolder the five wires leading to the manual
chassis start and run-motor switches. Determine these leads by tracing the leads from
the switches.
j. Detach pilot lamp bracket by removing two wood screws.
k. Unsolder eight scanner wires from terminals on back of drawbar base.
1. Unsolder brown wire from vibrato line.
m. Tie the disconnected cables to the chassis to prevent damage to the other
console components when the manual chassis is removed.
n. Remove the manual chassis through the rear of the console. Slide the chassis
out carefully. Because of frame construction. the chassis will drop suddenly before
it is entirely out of the console. Two men are required to remove the manual chassis
from the console.
o. Install a replacement chassis by reversing the procedure above. (See figure
10 in the Cables and Connections section ).
5-80. SWITCHES FOR START AND RUN MOTORS.
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