Technics SL-QL5 - Replacing Chips; Chip Component Replacement

m@
HOW
TO
REPLACE
CHIPS
(Resistor,
capacitor
and
jumper)
e
Removing
procedure
1
2.
N
.
Completely
remove
the
solder
from
both
ends
of
the
chip
by
use
of
solder
suker.
Touch
the
soldering
iron
to
the
end
of
the
chip
as
shown
in
Fig.
18,
then
turn
the
tweezers
in
the
direction
of
the arrow.
— oe
Witout color cord: With color cord
Chip resistor
Do
not
re-use
chip
resistor
or
Capacitor
without
color
cord.
Replacing procedure
.
Place
solder
on
the
foil
where
the
chip
is
fitted.
Then
solder
the
chip
by
holding
the
soldering
iron
as
shown
in
Fig.
19.
ote:
1.
If
the
chip
jumper
is
removed,
connect
a
coated
lead
wire
to
the
part.
(See
Fig.
20).
Chip
jumper
is
marked
with
‘’J’’
on
the
Printed
circuit
board.
Coated lead wire
Solder Solder
Fig. 20
Wn- e@
Tweezers
Solder
Chip
Soldering
iron
Note for replacing chips
Do
not
heat
the
chip
more
than
3
seconds.
.
Do
not
rub
the
electrode
against
the
chip.
Use
the
tweezers
with
Care
not
to
damage
the
surface
of
the
chip.
.
It
is
desirable
to
use
a
pencil
type
soldering
iron.
And
use
soldering
iron
less
than
GOW.
™@
MEASUREMENTS
AND
ADJUSTMENT
© Instruments used
1. Oscilloscope
2. DC voltmeter
3. 30cm record
4. Screwdriver
:
A
Adjustin
ee
Preparations
for
adjustment
sary
Adjusting
method
——
i
es
4
Start
1.
Turn
the
start
position
adjusting
1.
Put
30cm
record
on
turntable
mat
and
ne
screw.
Pa
close
upper
cabinet.
Poon
If
it
descends
between
tunes,
turn
the
p
Start
position
2.
Turn
the
power
switch
on.
achei
Serbuncloeianes,
3.
Push
the
“Start’’
switch.
Fi
21
If
it
descends
outside
the
disc,
turn
the
(Fig.
21)
screw
counterclockwise.
{_
T_
:
“on”
1.
Connect
lead
wire
with
clip
to
1C
301
pin@
VR
301
i
oat
Siete
aS
:
,
:
Ro
ag
2.
Adjust
VR
301
so
that
the
cycle
Clock
frequency
and
pin
@
of
operation
circuit
board.
(Fig.
22
:
+4
;
i
g.
22)
output
waveform
is
30
usec
+
1 psec.
2.
Connect
oscilloscope
to
IC
301
pin®).
:
he
(Fig.
23)