PRACTICAL SERVICE SUGGESTIONS
The following suggestions cover possible troubles in the pedal solo unit only.
Suggestions for the standard organ system will be found elsewhere in the service
manual.
Any trouble in the organ ahead of the matching transformer will not affect the pedal
solo unit, but trouble following the transformer will affect both systems equally.
Pedal Solo Unit Does Not Play First make sure that the tubes are lighted, all
controls are in playing position, and the rest of the organ plays normally. Several
possible causes of trouble are listed below in order of probability.
(a) Tubes. The tubes are of standard radio types and can be tested in the usual
way. Figure 3 shows their locations in the pedal solo generator
(b) Loose cable connector. See that the 15 pole plug and the shielded plug are
inserted tightly into the pedal solo generator.
(c) Keying circuit. A dirty contact in the PEDAL SOLO ON tablet or a defective
connection in any part of the keying circuit will prevent removal of the
cutoff bias when a key is played. If this is the trouble, grounding pin 15 of
the cable plug will make a pedal note sound. The following section, Procedure
for Removing Parts, tells how to reach and clean the tablet contacts.
(d) Amplifier or oscillator circuit. The amplifier circuit is conventional in
most respects, and voltage measurements will generally serve to identify any
trouble. Failure of the master oscillator will make the pedal solo unit fail
to play, and voltage readings will be helpful in this case also. Figures 4,
4A, 48 show the locations of all components, and a chart at the end of this
section gives their characteristics.
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