Cpu Board - Roland MicroComposer MC-4 Service Notes

ADJUSTMENT
CPU BOARD
1
^15V
1-1
Connect digital voltmeter
(DYM)
across TP5 and TP2
(
aND)
.
1-2
Adjust VRl for -l^-OOO+^mV.
2 D/A
OFFSET
2-^1
Set controls;
TOTAL
TTXNB
- center
CYCLE -
OFF
STtTC
- INT
TFS
o
®
TP3
CU
[13
2-2
POW^R
ON.
2-3
Write CVl and CV2 data
(OV)
for CHI to CE4j
following the
flow chart shown right.
(
simultaneously
)"="
(4
times)-^
—
2-4
Shift the
DVM lead to TP-1.
2-5
Flip MODE switch for
PLAY mode.
CPU
BOARD
Jtb nio
jo ts[
2-6
Push ENTEE. Fe^tI
2-7
Adjust
lffi4
for 0,000V. (0,000 to
0.099V)
Keep
the CV data for the .next
adjustment.
[I
[r
3
T ^^l
1
<^i
1
m
3
CV OFFSET
^his adjustment follows the
preceding.
3-1 Insert plug
with DVM
into a CV jack.
3-2
Adjust related VE for
O.OOOV
(0 to +O.2111V),
3-2
Repeat
the
step for the
remainder.
GH^
4
3 2
1
GV2 11 12 13 14
CVl
7
8
9
10 I^
VE
4 D/A,
WIDTH
[T6
no
3p TSJ
1 1
-I
! 1 1
«
112-
1^
1
in
1!
1
3 -
1 1
3
2^^
1
1
4 -
1
1
n
iw
1
1
M
--
111?
4-1
Turn power off then on.
4-2 Connect DV14
to CH-1 CVl jack.
4-3
Enter
the CV data 0-120 in 12
increments.
4-4
Hereafter, pushing
S'tfD
button will change
data
(and CE-1 CVl at the jack) and
display hy 12 at every step as
shown
below.
J}lote
that the data displayed on
indicator lamp precede actual data by
one step-
Lata
displayed
Ac
tiial
data
OVl
(To he +lraV)
volt
12
0.000
24
12
1.000
56
24 2.
000
48 35
3.000
60 48
4.000
72 60
5.000
84 72
6.000
96
84
7.000
108 96
8.000
120 103
9.000
.
.
.
120
10.000
(
120
10.000
)
-5
Adjust VE2 to the
tahle above.
Use VR3
to
compensate
for higher
CV only (data
72
and above).
14