Sharp GF-777H - Page 17

NOTES
ON
SCHEMATIC
DIAGRAM
-
Ref.
No.
Names
of
Switch
|
Swi
(A,
B)
Wave
Band
Selector
Switch
SW101 (A ~ L) | Record/Playback Switch
SW102 (A, B)
| SW103 (A ~D)
SW104 (A)
| SW105 (A, B)
| SW106 (A, B)
SW107 (A ~ D)
Function Switch
Recording
Mode
Switch
Manual-Auto
Dubbing
Switch
on-off
Deck 1 Tape Selector Switch
Deck 2 Tape Selector Switch
[ Meter Selector/Dial Light Switch
Tape-Radio-Line in/Phono
Switch Position
FM-SW, -SW, -AM
Playback-Record
Metal/CrO, -normal
Metal-CrO, -normal
VU/off-Tune/Batt/on
SW108
(A,
B)
FM
Mode/FM
Muting
Switch
Stereo/Mute-Stereo-Mono
SW301
SNRS
Switch
on-off
SW401
(A,
B)
Input
Selector
Switch
Line
in-Phono
|
SW501
(A
~
D)
Mixing
Switch
Radio
Echo/on-on/off-off/off
SW502
(A,
B)
Loudness
Switch
[
on-off
|
sw6o1
APLD
UP
Switch
on-off
|
Sw6o2
APLD
DOWN
Switch
on-off
sw701
;
Deck
1
Main
Switch
©
on-off
SW702
Deck
2
Main
Switch
©
on-off
|
sw703
Deck
1
Main
Switch
on-off
|
SW704
Deck
2
Main
Switch
on-off
SW705
Deck
1
APLD
Switch
on-off
|
Sw707
Deck
1
APLD
Cut
Switch
on-off
SW709 (A, B)
SW710
Deck Mode Selector Switch
Deck 1 Main Switch ®
5x or
fe 2-1 *g 2
on-off
SW711
Deck
2
Main
Switch
@
on-off
SW712
Editing
Switch
on-off
|
SW713
Pause
Switch
TET
secre
SW801
Power
Switch
__|_
on-off
SW806
(A,
B)
Beat
Interference
Cancelling
Switch
A-B-C
sws901
AC/DC
Selector
Switch
AC-DC
SWw902
AC
Supply
Voltage
Selector
Switch
Syl
10-220-240V
1.
Parts
marked
with
“a”
(
)
are
important
for
mainiain-
4.
As
to
electrolytic
capacitor,
the
expression
“capacitance/
withstand voltage”’ is used.
5.
For
voltages
at
each
point
of
the
tuner,
they
are
indicated
in
parentheses
for
AM
and
the
values
without
parenthese
are
for
FM.
In
any
case,
the
voltage
is
measured
with
no
signal
given,
by
using
VTVM.
6.
Attention
should
be
drawn
to
voltage
and
the
relevant
conditions
below.
Audio
voltage
—
in
play
mode
and
under
no
signal
in
microfarad.
P
=
picofarad
condition.
Parenthesized
parts
voltage
—
under
record
*
The
types
of
capacitors
are
seen
from
the
symbols
ML
condition.
PHONO
circuit
voltage
—
in
PHONO
made
ON
{mylar
capacitor).
Styrol
(polystyrene
film
capacitor)
position.
and
CH
(temperature
compensating
ceramic
capacitor).
ing
the
safety
of
the
set.
Be
sure
to
replace
these
parts
with
specified
ones
for
maintaining
the
safety
and
performance
of
the
set.
2.
To
differentiate
the
units
of
resistors,
such
symbols
as
K
and
M
are
used:
the
symbol
K
means
1000
ohms
and
the
symbol
M
means
1
Meg.
ohm
(1/4
W).
3. Capacitor
*
Unless
otherwise
specified,
any
capacitance
is
expressed
SERVICING OF LEG-LESS TYPE RESISTORS AND CAPACITORS
method different from that for the oridnary type of resistors
and capacitors.
The leg-less type resistors and capacitors are available in either
of the tubular and square shapes, and here’s their servicing
y=
Removal of the Tubular-Shaped Tip
‘lr
Using a soldering iron, heat the solder at each terminal of
the tip to get it absorbed into a braided wire applied
thereon. See Fig. 18-1.
. Holding the tip with a pincette, take it off gently using the
soldering iron’s heat applied on each terminal of it. See
Fig. 18-2.
Removal of the Square-Shaped Tips
1.
Using a soldering iron, heat the solder at each terminal of
the tip to get it absorbed into a braided wire applied
thereon. See Figure 18-3.
. Holding the tip with a pincette, take it off gently using the
soldering iron’s heat applied on each terminal of it. See
Figure 18-4.
Cautions on removal:
1;
2.
3:
4.
When handling the soldering iron, use a proper force and
keep a careful manner.
When removing the tip, do not use undue force with the
pincette.
The soldering iron in use should operate on AC 100V
(400W); it is best if provided with a thermal control (240°
or so).
The tip once removed must not be used again.
Attachment of Tubular-Shaped Tip
I.
2
Temporarily solder one terminal of the tip on the copper
foil surface. See Fig. 18-5.
Holding one end of the tip with a pincette, completely
solter both terminals of it one after another. See Fig. 18-6.
Attachment of Square-Shaped Tip
l.
2.
Temporarily solder one terminal of the tip on the copper
foil surface. See Fig. 18-7.
Holding one end of the tip with a pincette, completely
solder both terminals of it one after another. See Fig. 18-8.
Cautions on attachment:
1.
When soldering the tip terminals, do not touch them
directly with the soldering iron. The soldering must be as
quick as possible being careful not to hurt the terminals and
the body itself.
. When touching the tip with a pincette, hold its terminal but
never its body. See Figs. 18-6 and 18-8.
. Keep the tip’s body in contact with the P.W.B. when
soldering.
. The soldering iron in use should operate on AC 100V
(40W); it is best if provided with a thermal control (240°C
or so).
. The soldering amount must be enough but not be outside
the specified area.
General Cautions on Handling and Storage
iF
2.
Oxidization on the tip’s terminals results in poor soldering.
Do not handle them with bare hands.
For storage, avoid the following places where oxidization
will occur and their capacitance or resistance will be
deteriorated.
1) Sulfur or chlorine gas floating places
2) Directly sunlit places
3) High temperature/high humidity places
Braided
Tubular tip wire
Soldering iron
Copper foil
older
surface 3
P.W.B. Adhesive
Figure 18-1
Pincette
Tubular tip
Soldering i
Copper foil PIngsron
surface
ee
P.W.B. Adhesive
Figure 18-2
Braided
Square tip wire
Soldering iron
Copper foil
surface Solder
P.W.B. Adhesive
Figure 18-3
Pincette
Square tip
Soldering iron
Copper foil
surface
P.W.B. Adhesive
Figure 18-4
Soldering iron
Solder
Copper foil
surface
a... oaoS“c=”M(S SS ———
P.W.B.
Figure 18-5
Soldering iron
Solder
Pincette
Solder
Copper foil
surface
P.W.B. Tubular tip
Figure 18-6
Solder
Copper foil Soldering iron
surface
ST <0.
P.W.B.
Figure 18-7
Soldering iron
Pincette
Copper foil
surface
P.W.B. Square tip
Figure 18-8