Hammond L series User Manual

3.0V and
5.5V
rms. With
PERClMBN
SOFT
tablet depressed,
output
should
be 1.5V to
2.8V
rms.
i.
Vibrato check.
Depress
FULL ORGAN
tab.
Hold
down
F,
A, C
chord
near
center
of upper
manual.
Depress
VIBRATO
SMALL tab and observe
vibrato
effect.
Then, in addition,
depress
VIBRATO
NORMAL
tab. Vibrato
effect
should
increase.
In
addition,
press
VIBRATO
CHORUS tab.
Vibrato
effect
should
be-
come
more pronounced.
NOTE
Later organs,
Figures
5—2
through
5—4, are
equipped
v^ith
vibrato
width
potentiometer
R131.
Ad-
just
if vibrato
effect is too narrow
or too broad.
j.
Reverberation check.
Depress
FULL OR-
GAN tab.
Hold
down
F,
A,
C
chord
near
center of
upper manual.
Add
REVERB
I
tab.
Observe that reverberation is heard
as
chord is played and released. Add
REVERB II tab.
Reverberation should
be
increased relative
to REVERB
1
tab
as
chord
is played and released.
k.
Microphonics and Hum check.
1 .
Tap each
tube
and replace
it
if
there
is
ring or
howl
in
the
speaker with
expression pedal
maximum
and
VOLUME SOFT
tab
not depressed.
2.
Hum
in
speakers
with
expression
pedal
maximum
and
VOLUME
SOFT
tablet
not depressed
must be very low
in
vol-
ume
and not measure
more than 15
mV rms.
If
hum is
excessive,
see para-
graph
4-22.
NOTE
On
L-
100-2
the SILENT-SOUND
tab
on
Rhythm II
must be
in SI-
LENT position.
VIBRATO.
-
To
check
vibrato proceed ac-
cording to
the following.
a.
Pull out
upper manual
2'
drawbar to
position
8. All
other
drawbars
in.
De-
press
UPPER DRAWBARS
tab.
b.
Remove the phono cable from the BN.
phono jack located on
the preampUfier
chassis.
Connect
the
scope
VERTICAL
INPUT
to the
phono
plug removed.
c.
Remove the phono
cable
from
the BK.
phono
jack
located on the vibrato phase
shift
ampUfier.
Insert into the
BK.
phono
jack an
adapter
with
two
phono
jacks
and
one phono
plug.
Reconnect the
phono
cable (black) into
one
of
the
adapter phono jacks
and
connect the
scope EXT.
TRIGGER
IN binding
post
to
the remaining adapter
phono jack.
d.
Set scope
controls
as follows:
1.
TRIGGER:
SOURCE
-
EXT.,
COUPLING
-
AC;
SLOPE
+
2.
HORIZONTAL SWEEP
-
0.2
msec/cm.
3.
VERTICAL
SENSITIVITY
-
0-2
volt/cm.
e. Hold
down
key
#7
(frequency
#60)
on
the
upper manual.
f.
Adjust
the
TRIGGER
LEVEL
control
for
a stable pattern.
g.
Adjust
the VARIABLE sweep
time
control until one complete sinewave
covers 4
cm.
h. Adjust
the VERTICAL
VARIABLE con-
trol for a display height
of 4
cm.
i. Depress the
VIBRATO NORMAL tab.
Adjust
the VIBRATO
WIDTH
control
for
a
total phase shift
swing
of
2 cm.
(refer
to
Figure
4-1).
If
VIBRATO
WIDTH
control
does
not give satisfactory
result,
select
R133, Figure
5—1
through
5-4
between
220a and IK.
2
CM
/2CM
Figure
4-1.
Vibrato
Adjustment
Waveform
NOTE
Phase
shift can be read best if
waveform is
centered so that the
center
peak of
the
sinewave
coin-
cides
with
a
graticule line.
j.
Release
VIBRATO NORMAL tab.
Single
wave must be
centered
±
Vi
cm. as
shown
in
Figure
4—1.
k. Disconnect external leads and adapter.
Reconnect
phono
cables to proper jacks.

Hammond L series Specifications

General

Brand	Hammond
Model	L series
Category	Musical Instrument
Language	English