Service manual

ward travel and white keys between 3/16 and 1/4
inch. If necessary, rebend by gently massaging the
portion of the wire between the actuator and the
attachment point. The contact must make before
the key bottoms on the touch sensor assembly.
6.2 KEYS
6.2.1 CLANKING
Keys will clank or thump if the tails hit the
case on the down stroke. This problem can be
repaired by gluing a thin spacer such as a 1/16
inch thick piece of wood to the case immediately
above the plastic strip over the key pivots. The
case will be forced away from the keys upon
reassembly and clanking should cease.
6.2.2 STICKING OR SLUGGISH FEEL
Check the pivot for being too tight. Rotate
the pivot tab about the vertical axis by bending a
few degrees with a pair of pliers. Make certain the
key tails are not rubbing on the back of the case
necessitating the removal of some of the wood with
coarse sandpaper. Keys near either end of the key
board may stick because the hex head screw that
fastens the rear mounting brackets to the keyboard
frame does not have its flats aligned vertically. In
this case, the screw head will rub against the key
return springs and cause the trouble.
6.2.3 LEVELING
If a key does not return to the same height
as its neighbors, the key leveling tab located inside
the front end of the metal body of the key must
be bent up or down as required. Remove the key
screw so the ivory comes off and reposition the
tab using the keyboard adjusting tool, part number
962-043031-001.
6.3 TOUCH SENSOR
6.3.1 SENSOR MOUNTING
The touch sensor assembly is mounted to
the keyboard frame by 5 studs attached to the
sensor assembly. The height of the assembly must
be set so that the keys will bottom on the sensor
assembly and not on the key leveling tabs. The
5 studs are locked into position by 10 nuts on
either side of the keyboard frame. The sensor is
intentionally warped by the extreme end studs
when mounted so that its ends are approximately
1/16 inch further away from the keyboard frame
than its center. This must be accomplished before
the keyboard is installed in the chassis. The warp
ing must be accomplished so that touch sensitivity
for keys at the ends of the keyboard is the same
as that for the keys in the center. If this is not
accomplished, the center keys will be overly sen
sitive while the end keys will not have enough
response.
6.3.2 ADJUSTING SCREWS
Two slotted screws set the pressure with which
the rod bears against the foam pad. Adjust these
screws as follows:
1 OCT and 2 OCT tab switches up
VIOLIN and PITCH tab switches down
TOUCH SENSE variable resistor
full clockwise
Play over the entire keyboard "with a normal
light playing touch. If unwanted pitch bending
occurs, tighten slotted screws by turning counter
clockwise until bending occurs only when extra
pressure is applied to the keys.
If the screws are over tightened, the sensor
will not be responsive enough. The pitch should
bend upward at least a fifth (7 semitones) for any
key pressed down heavily. Especially check the
keys near each end of the keyboard as they nor
mally will be less responsive. If necessary, loosen
screws slightly by turning clockwise and recheck
for over sensitivity.
6.3.3 TOUCH SENSOR INTERMITTENT OPERATION
WHEN DEPRESSED OR TOUCH SENSOR DEAD
This trouble may be due to open contacts
between the shielded cable and either the con
ductive nylon (snap fastener) or the touch bar
(No. 6 screw in end) or there may be a short between
the touch bar and the nylon. Shorts may occur
around the two holes in the rod through which the
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