Hammond X-5 - Page 31

appear
through
Q6 or Q7 which
is used
as an
emitter follower.
The
signals gated
and amplified
are balanced
by
VR1, and added
Pedal signal
through J707,
and exit
at J708
pin 5.
2. The second
section
of this
board provides the
Percussion
signals. These
signals are
applied to
J702
from
Percussion
Tabs in
Lower left-hand
End Block,
and pin
5 is the input
and pin 3
is the output.
The signal
is amplified
by
Q8,
which
gain is
controlled
by Q12. Q9
is buffer
amplifier, and
these
amplified signal
provide
to add the Tone
Bars
signals,
and to input
the upper manual
input in
J701.
The envelope
of percussion
signals is generated
by
Q3, Its decay time is
controlled
by Decay
Tab
through
J702 pin 1 and
pin 2 is switched; If
pin 1
and pin
2 will be connected,
the decay time
is slow,
and if pin
1 and pin 2
will be not connected,
the
decay
time is fast.
VR2 controls the off
point of
percussion signals.
If an upper
manua! key is depressed,
the negative
D.C. voltage is
connected to J705 through
Repeat
Tab, and this voltage
triggers Q3. Q3 is turned
on.
and charges up
C38 or C39. This
charging controls
the envelope of percussion.
3.
The
third section
of this
board provides
the
repeat
oscillator.
The
oscillator used is the
self
running
multi vibrater
type, Q15
is normally off,
and
the
oscillator is
stopped. If
upper manual
key
is
depressed, the negative
D.C.
voltage
is connected
to
the base of Q1
5
through
J703,
and
Q1 5 is turned
on,
and the
oscillator
runs. This output
of osc. is
connected
J705 pin 3 through
the Repeat
Tab
in
Lower left-hand
End Block.
This output
pulse
triggers
the transistor
Q3, and then
the percussion
signals is
repeated
automatically. The
repeat rate of
this oscillator
is controlled
by Repeat Rate
Pot,
In Lower right-hand
End Block
through
J706
in 1
and pin 2.