Mitsubishi DA-C20 - Adjustment and Calibration; PA-66 Printed Circuit Board Adjustment; PA-67 Printed Circuit Board Adjustment

Remove
the shield
plate
by un-
screwing
the
shield
Plate
assembly
screw
(S
in Fig.
5)
located
between
Pr.inted
circuit
boards
PA-66
and
PA-67.
With
the set
in
this
conditioo,
it is
possible
to
replace the
parts
provided on
printed
cir-
cuit
boards
PA-65 and
PA-67.
ADJUSTMENT
1.
Printed
Circuit
Board
(PA-6
6
)
L)
set
the
semi-fixed
resistor
vRsol
comPletelY
in the
conter-
clod(wi-se
di rection
'
2)
set
the
power
s\ri tch
to oN
position.
3)
Connect
the voltmeter
to the
ground
terminal
(34)
and the
terminal
(33)
on
+B
side and
turn
the vF50I
clockwise
(in
the arrow
direction)
to ad.just
it
so
that it
may
indicate
33!0. 5
(v)
.
4) Connect
the
voltmeter
to
the
ground
terminal
(34)
and
the ten[inal
(35)
on
-B
side
and confirm
that
it
indicates
-3311.s(v).
2. Printed Circuit
Board
(PA-57)
1) Set
the semi-fixed
resistor
VR5O1
completely
in
the cormter-
clockwise
direction.
2)
Set
the
power switch
to
oN
posltion.
3)
Connect
the
voltmeter to
the
ground
terminal
(84)
and the
tenrrinal
(83)
on
+B
side and
turn the vR60l
clockwise
(in
the arrow
direction)
to adjust
it so
that
it maY ind.icate
3310.5(v).
4) Connect
the voltmeter
to
the
gror:nd terminal
(84)
and
the terrdnal
(85)
on
-B
side
and
confirm
that
it indicates
-3311.5(v).
View seen
at
copper foil
side
The
side
whe
re the
parts
of the
printed
circuit
board
(PA-67)
are
inserted.
8)
9)
To adjust this
printed
circuit board,
the
tuner section
must be
removed.
pA-66
-
lo-