Roland RE-501 - Playback Heads Adjustments; Playback Head Sensitivity; Playback Equalizer; Recording Adjustments

JULY
11,1980
2-6-2.
Playback heads
Input
signal: IkHz,
square,
for OdB LED
display.
Panel
controls
setting:
as shown
at
the
left.
a) With
ECHO MODE
selected
to
corresponding
head
adjust playback
head
for
the
following:
(1)
Waveform
slope is
straightened.
(2)
Leading
edge
is
as
perpendicular
to base
lin<
as possible
or has
shortest
rise
time.
2-8.
RECORDING
BIAS
b)
Readjusting TANGENCY
described in(a)
of
2-6-1
at this
step may prove
effective
to
obtain
waveform
stability.
Output
level differences
among
playback
heads
are
to be compensated
for in
later
section.
2-1.
EXPANDER
Input
signal: IkHz, sine wave, OdBm
to
INPUT-2.
a)
Turn VRlOO
FCW.
Reversing it gradually,
find
the point which
furnishes the highest
output.
b) Set VRlOO
for
+ldB
of the
peak value.
ECHO
OUTPUT
LEVEL SIGNAL
IswncHavncHl
^n^pCRJS
ECHO
Sons
OFF
OFF
ON
OFF
CW
—
VRlOO
—
CCW
2-9. PLAYBACK
EQUALIZER
Input
signal :1kHz,
sine wave
for OdB
reading
on
LED
bar.
ECHO MODE:
1
a)
Set
VRlOO
on
PS-66
for maximum
meter
reading
at
OUTPUT
A.
b) Set VR6
for
OdBm+JdBm reading
on the
meter.
c) Decrease audio
generator
output
by
40dBm.
d) Adjust
VR9
so that the meter
reads
40+0.5dB
lower
than
that at
step b.
As can be
seen from the figure
below,
VR9,when
turned,
will
deviate
input-output
curve at
point which
preadjusted
by
VR6.
d) Repeat
steps b-d for
specified
results.
This
input-output
curve
has pronounced
effect
on smoothness
of level
decrease
ratio
of multiple
echo
sounds
and
residual
noise.
The
curve
should
be as linear
as
possible
.
VR6
Od,
ECHO
OUTPUT
40+0.
5 dB
VR9
ADJUSTING
RANGE
f€VERB TONE
OUTRJT
REPEAT
RATE
BAS
TREBLE
CENTER
MIN
CENTER
CENTER
lOdBm
5INGLeI
Input
signal': IkHz,
sine wave, OdBm
to
INPUT-
2
jack.
ECHO MODE:
1
a)
Adjust
VR6
for OdBm
reading
at
OUTPUT
A.
b)
Reset audio
generator
for lOkHz,
OdBm.
-p
c) Set
VRIO
for -15dBm
-3
dBm
reading
at
OUTPUT A.
If
VRlO
fails
to produce
this output,
readjust
VRlOO
together
with VRIO
at lOkHz.
-40dBm
OdBm
INPUT
RE-501
/SRE-555
2-10. PLAYBACK
HEAD
SENSITIVITY
CONTRa
PANEL
INPUT
POTENTIOMETER NO.
CHECKX
PONT
^
vauME
VRA VR5
VR6 VR7
OUT
PUT
A
MAX
LEVEL
SKiNAL;
ECHO
Sens
ON OFF
CONTROL
PANEL
INPUT
INPUT
DIRECT
c^ca^\
VaUME
LEVEL SIGNAL
POTENTIOMETER NO.
paNT^
SWITCH
SWITCH
VR2
VR3
OUT
PUT
A
MAX
uafim
OFF
ECHO Sons
ECHDSerS
VOLUNE
INTENSITY
TONE
BASS
I
TREBLE
CUTarr
HB=EAT
l£Va
SINGLE
3^
TCH [switch
MAX
MIN
CENTERCENTEROdBm
siNGir
EFFECT
MOOe switch
REVERB
TONE OrTPUT
REPEAT
CHORLSI EOC
I Sons
VOLUME
BASS
[
TREBLE
ON off!
OFF
MIN
CENTER
CENTER
- -
Input signal:
IkHz, sine wave, OdBm
into
INPUT
2
jack.
To obtain equal echo outputs in
sound level,
a)
adjust
each trimmer
potentiometer for
OdBm^Q^g^® reading
at
OUTPUT
A jack.
ECHO
MODE TRIMMERPOT
Input
signal:
IkHz,
rectangular,
0.3Vp-p
into INPUT
2
jack.
a) Rotate
VR2
to
its midpoint.
b) Set
VR3
for chorus output waveform
symmetrical to the
base
line of
scope.
CONTRa
PANEL
IPOTENTIOMETER NO.
'PONT
\
IswnCHlSWTTCH!
INWT
MRECT
effect
MOOE
SWITCH
^Sl^lS^CHCasI
ECHO
I
Sons
OdB
OFF
OFF
ON
OFF
2-13.
CLOCK COMPONENT REDUCTION
ECHO
Sons
VOLUME
ECHDSoiS
INTENSITY
REPEAT
RATE
REVERB
VOLUME
TONE
BASS
1
TREBLE
OUTFUT
LEVa
SWITCH
REPEAT
SINGLE
SWITCH
MAX
MAX
MIN
-
—
-
REPEAT
Input signal: IkHz, sine wave,
OdBm
into
INPUT
2
jack.
a)
Rotate
ECHO/S
on
S knob to
lOth
point from
FCCW.
b) Feed
the signal
for
a
short period
(0.5-2s).
Adjust
VRll
for finfinite echo repe-
tition or oscillation.
c) Reverse the knob to 9th
point
.
Echo sound should die away
gradually
.
Scope's distributed
lead capacitance shoTild
not be more than 47pF.
a)
Adjust
VR2
for minimum
discrepancy in
amplitude
between
clock
p-ulses on
the
base
line
.
b)
Adjustments
2-12
and 2-13
are inter-
related.
Repeat
both
adjustments for the
best
result
.
11