Panel Board; Cpu Board - Roland JUNO-106 Service Notes

JUNO-106
JUL.
31,
1984
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JUN0-1O6
CPU BOARD
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NOTE: BACKUP CIRCUITRY/BATTERY
(CPU
BOARD)
GROUNDING
IC4
0PEN TERMINALS
-
Mandatory On
Units with
Serial
Numbers Up To 439000
-
To
insure
a
longer battery
life,
short together
IC4's pins 4,
5 and
7 (or a
DG
terminal) of the
CPU
board.
In practice,
first
connect
a
jumper
wire to
a digital
GROUND
and then to
pins 4 and 5 to protect IC4 against
static
charges.
REPLACING BATTERY
Also
replace the battery that cannot supply
more
than 2.8V under
installed
condition.
In
replacing, be sure to observe
polarity of the battery.
After mounting, check
the voltage;
it
must
be
more
than 3V.
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