Akai AJ-P4270R Service Manual Page 9

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VI.
ADJUSTMENT
6-1.
BALANCE
OF
±
6V
ON
THE
POWER
SUPPLY
PC
BOARD
1)
Connect
a
Digital
DC
Voltmeter
between
Pin
[T]
(+6V)
and
Pin
0
(GND)
of
connector
P4
on
the
POWER
SUPPLY
PCB
as
shown
Fig.
6-1.
2)
Read
the
+
Voltage
Value
at
the
Pin
[T|,
and
connect
a
Fig.
6-1
POWER
SUPPLY
PCB
Adjustment
Points
Digital
DC
Voltmeter
to
Pin
[4].
3)
Adjust
VRI
so
that
the
Voltage
Value
at
Pin
|
Pin
GQ
are
equal
or
within
±
0.1V.
land
6-2.
OFF-SET
OF
FINAL
VCA
ON
THE
VOICE
PC
BOARD
TP.O
<J
piC44
0
TP2
FOFF
SET
IC42
JiVRS
J/OFF
SET
1)
Set
the
ENVELOPE
GENERATOR
to
VCA
mode
and
set
the
EG
DEPTH
Control
to
maximum
posi
tion.
2)
Connect
a
Digital
Voltmeter
between
TP1
and
GND
Fig.
6-2
VOICE
PCB
Adjustment
Points
and
adjust
VR7
so
that
the
Digital
Voltmeter
Read 0
±2mV.
3)
Connect
a
Digital
Voltmeter
between
TP2
and
GND
and
adjust
VR8
as
same
manner
as
VR7.
-SERVICE
MANUAL-
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