Adjustment Of Idling Current; Adjustment Of Neutral-Point Potential - Mitsubishi DA-A10DC Service Manual

ADJUSTMENT
(DA-A15DC
can
be adjusted in the
same
manner
as
in
DA-A1oDC.
)
.
Adjustment
of Idling
Current
l) Set the
speaker
selector
switch
to
OFF
posi
tion.
2)
Connect
a
DC
anmete
r
between the
terminals (10) - (15)
on the
printed circuit board (MA-25) of
DA-A1oDC
or
connect
it
between the
terminals (40) -
(45) on the
sane
circuit board (Me-25).
3)
Rotate
VR104
and VF204 and
make
the
DC
voltmeter indication
rrinimum.
4) Adjust
VR104 and vR204 and
make
the
DC
voltmeter indication
1,0
mv.
5) At it takes time before
a
steady
state
appears,
readj
ust
after
approximately
10 minutes
so
that the voltmeter indicates
5013
mV.
NON-S]O{AL
CURRENT
-
TEMPERATURE
GIARACTERTSTIC
Adjustment
of
Neutral-Point
Potent i
a1
l)
Connect
the
DC
volureter
be-
tween
the terminals (23) -
(61)
on the printed circuj-t
board.
of
DA-AIoDC
or
connect
it
be-
tween
the terminals
1531
-
(61)
or the
same
printed circuit
board.
2)
Rotate
VRL03
and
VR203
and
ad-
just
them
in the
mechanical
center.
3)
Make
a
rough adjustment
of
tJ:re
DC
voltmeter indicati"on for
0i5
mV
by
means
of the
VRI02.
ltren
make
a fj-ne
adjustment
by
means
of the
vR103.
In the
s
ame
manrter, make
a fine
adjustnent of
Rch
by
means
of
vR202
after
making
its
rough
ad-
justment by
means
of
VR203.
DA-AIODC PRINTED CIRCUIT
BOARD
ON
THE
COPPER
SIDE
Printed circuit
board
l4A-
25
.tl
C]
lr
tt
a
o
rd
b'
..1
o
I
o
Tolerance
DA-A}ODC
DA-A15DC
Ambient temperature
(
"C)
Qvnron
vR2o4
O
vRro2
C
Q
vneoz
vRro3o
f- |
O
vR2o3
-9-