ADJUSTMENT
METHOD
8-1.
PLL
circuit
adjustment
1.
main
power
ON
2.
Prepare
sine
wave
oscillator,
set
the
oscillator
output
2V+/-
0.2
V
as
shown
at
Fig.
8-1
by
connecting
cassette
I/O
jack
JA
nugger
5
pin
and
number
2
pin
to
1.7K
+/-
5
Hz
oscillation.
3.
By
inserting
lO
K
ohm,seria1
to
the
measuring
terminal
of
the
voltmetre
which
has
more
than
1
M
ohm
input
impedance,
then
measure
the
voltage
between
test
pin
TP13
and
TPl4
as
shown
in
Fig
8-1.
The
adjustment
of
the
R109
to
be
Ov+/-
2
mv
is
necessary
at
this»stage.
(Other
Method)
By
in;
utting
the
signal
between
no.5
and
no,
2
terminal
of
the
cassette
I/O
jack
JA,
under
the
cassette
cable
is
connected
to
the
main
frame
of
the
Basic
Master
Level
3,
the
signal
can
be
inputted
to
the
point
of
ack
,ll
t
the
mini
jack
Oscl
a
or
as
Fig
8-2.
wg}te
\
|
earth
line
Fig.
e-2
JA
_JC
1
l
TFT6
TPI3
TPH
1
,jggirj
E;
if
_
_
»
Q0
L,
V1
\
-
~
»@
ug,
_-
wk
.
e
e
f
_
_
,_
my
7
fa -
’ .13iI1
A
_
_.E-?+a|u-#e~:
’
,
’S
3
_" ’
;¢~»r;::
m
_ - _ - 2 * . J ! ! ‹ § ¢ ; a ; ; e : ¢ \ \
A
ILP’
a§J\1S§-
_ ‘ ¥ * ; i f
__
.
:Eg
" ’ f f h A " » ’ l
’
""" ’
’i’
"
f
’ i
W
_
A
-
» 5 f _
;-__
Jig.
g-:_
5’;k;§_.urrvr
%;;|-,rg
,‘+
,Q
5;
’
v » , = , _ f a i § ¥ f |
:=»~=gr¢
_
-l
¢__,,.,
Ø
,W
_
"’
U 7 1 ¢ » » » 2 ’ f ’ . F " ? ’ b " 6 ! = £ 5 f , . f ’ l " ;
w it
~.e,.:-nu(
._
. .
=
Z
1.
..=1_
___.,;=F?_.
g
RW9
"’
""‘
, . ; _ _ _
c
"
._
_
Z9\=%pF~xi£2:!?}$¥’\\§_!fli‘
-
~l
_
_
mx-.--~
uri;
_"W
:My
_:Q
~_
H;
gf
~§
PU’
’
f 5 § » » u . e r ; f #
~ --’ .;=’f&’:¢37*
msn!!
.metre
rg
....,_,_-
_
_
’..2-,,=¢;-
_
"
_
1
.pi
=f
45
= : ‘ »
-’
.’
!-
-
fi
Tag*
Q-UTEUUUQ.
gg’
.
*
1_’f§fQ»§§?a’§ll\ll|
__\l|.ll¢=!\
:
¢_
_,V
,
| | : ! @ s ~ » .
if
gg;
> - . . ? » 4 Z , i ’
T;-m ’
.|
,
"
W
,
Fig.
8-l
82
Содержание MB-6890
Страница 1: ...HITACHI PERSONAL COMPUTER MB 6890 SERVICE MANUAL I R 0 3012 98 ...
Страница 2: ...HITACHI PERSONAL COMPUTER MB 6890 SERVICE MANUAL ev O 30 1 2 1 ...
Страница 42: ... one of page 40 44 missing ...
Страница 122: ......
Страница 123: ......
