In case this procedure is not effective, the busbar shifter for that manual may be
adjusted by turning the stud about two turns in either direction. It may sometimes
be necessary to hold down the offending key while turning the busbar shifter, in
order to wipe the contact clean.
Model A consoles below serial number 995 are not equipped with busbar shifters
except in cases where the manual chassis and pedal switch have been rebuilt.
Manual Wiring - Models A, AB, AV, BC, BCV, BV, C, CV, D, DV, G, GV, RT.
Figure 4, a wiring chart for the playing manuals, will be helpful in tracing
difficulties associated with the generator or manuals. All playing manuals are wired
alike from drawbar 2 to drawbar 8 inclusive, but the wiring of drawbars 1 and 9
varies. Column A shows the wiring of drawbar 1 for consoles above serial number
17075; column B refers to all consoles having 82 note generators; and column C is
the wiring used in all earlier consoles. Column D shows wiring of drawbar 9 for
Model A consoles below serial number 2500 and Model BC console below 5076; column E
refers to all later consoles.
These variations in wiring are designed to match the different type of generators
described in the section covering tone generators, and therefore the various types
are not interchangeable.
Manual Wiring - Models B-2, B-3, C-2, C-3, RT-2, RT-3, A-100 & D-100
The key circuit wiring for these models is the same as for previous consoles above
serial number 17075, and so columns A and E in figure 4 apply.
4
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