Roland JUNO-106 - VCF Frequency and Width Adjustments

ADJUSTMENT
Adjustment must be performed in the order listed below,
POWER SUPPLY BOARD
a
ENTERING TEST MODE
a
MODULE BOARD
a
JACK BOARD
oe
CHECKING MID! FUNCTION
CAUTION
Allow at least 10 minutes for warmup period; manda-
tory upon VCF adjustments.
1. DC SUPPLY VOLTAGES
(POWER SUPPLY BOARD)
CAUTION
Any slight adjustment on this board must be followed
by
a
complete
adjustment
of
the
rest.
Do
not
touch
the
trimmers
inadvertently
before
checking
the
test points for voltage.
Test
instrument:
Digital
voltmeter
with
10mV
resolu-
tion.
1-1, Adjust VR1 for —15V + 10mV at @.
1-2, Adjust VR2 for +5V + 10mV at ©@).
1-3. Verify +15V + 0.8V at ©.
1-4. Verify +5V + 0.5V at ©).
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JUNO-106 POWER BOARD
PEISTIZG — (00/407)
VbIS9 124
TEST PROGRAM
The following adjustments can be performed with the
aid of Test Program stored in the CPU on the CPU
Board.
To enter the test mode, hold KEY TRANSPOSE down
and turn the JUNO-106 ON; the display window will
biti
read LL! LI indicating that the unit is in the test
Mode, During the test mode, each switch serves as fol-
lows:
RANGE
Ey
PEB“291-900
Creefeto)
_t
JUNO-106
FUNCTION DURING THE TEST MODE
KEY UNISON:
ASSIGNMENT
All six modules are assigned simultaneously to a key being pressed.
NON
The
voices
are
assigned
to
the
keys
played
in
the
order
CH1
to
CHG
as
ROTARY:
long
as
the
previous
keys
are
held
down.
One-key
staccato
always
sounds
CH1
only.
The display window indicates currently assigned channel number,
ROTARY:
The
voices
are
assigned
in
cyclic
manner;
7th
key
steals
the
voice
from
the
Ist
key.
The display window indicates current channel number.
BANK
GROUP
A
HOLD
OFF
GROUP
GROUP
B
HOLD
ON
TAPE
SAVE
LED
MIDI
FUNCTION
IT
CHECK
CHECK
LED
VERIFY
LED
|
MIDI
FUNCTION
J]
CHECK
MIDI
CH
hol
Turns
D/A
output
to
OV
Pressing
BANK
buttons
also
evokes
Test
Program
and
sets
the
front
panel
controls
as
below.
PATCH
buttons
have
no
effects
in
the
test
mode.
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[ven
[ew
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DISL
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Y
D
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L
E A
VCA
forter
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Not
all
TEST
FUNCTIONS
are
involved
in
the
adjustment.
Edit
functions
also
are
active
in
test
mode;
when
an
edit
is
made,
display
window
lights
a
dot.
To
return
to
the
test
mode,
press
the
same
BANK
button
again.
18
JUL, 31, 1984
2. DCO CV OFFSET
(MODULE BOARD)
Test instrument: Voltmeter (1mV resolution)
Test point: TP3
Key
assignment:
POLY
1
(UNISON
during
test
mode}.
2-1. Press MIDI CH button; D/A converter turns its
output to OV.
CAUTION
Pressing
any
key
on
the
keyboard
releases
MIDI
CH,
let-
ting
the
D/A
to
develop
voltage
according
to
that
key.
Press
MIDI
CH
again
to
defeat
the
key
voltage.
2-2. Adjust VR33 for OV reading.
2-3.
Leave
MIDI
CH
ON
for
the
next
adjustment
3.
3. VCABIAS
{MODULE BOARD)
Test instrument: Voltmeter (1mV resolution)
Test point: TP7
Key assignment: POLY 1 (UNISON during test
mode).
3-1. Press MIDI CH. Refer to “CAUTION in 2-1”,
3-2. Adjust VR34 for a reading within +0.25V to
+0.27V.
4. VCA OFFSET
(MODULE BOARD)
Test instrument: Oscilloscope
Test
point.
TP8
(CH1)
to
TP13
(CH6)
BANK: 1
Key
assignment:
POLY
1
(UNISON
during
test
mode)
4-1. Adjust the following trimmers, respectively, for
the minimum thumps.
VRNO. 30 25 20 15 10 5
CH NO. 1 2 3 4 5 6