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Pioneer SX-303 User manual

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YQ)
PIONEER
CIRCUIT
DESCRIPTIONS
le
ae
REPAIR
&
ADJUSTMENTS
fe
GG)
4
ce
AM/FM
STEREO
RECEIVER
_
MODEL
SX-303
(SX-303L)
COMES
IN
FIVE
VERSIONS
DISTINGUISHED
AS
FOLLOWS:
Model
|
Voltage
:
Remarks
|
SX-303/KU
|
=
AC120V
only
-
oats
Fe
|
ou
S.A.
model
SX-303/KC
AC120V
only
|
|
¥
=
a
Ee
|
.
fF
Canada
model
SX-303/S
Pe
ACT
10V,120V,
220V
and
240V
(switchable)
General
export
model
|
:
a
SSiSSaRcnL:
ETT
aidan
acienaaemeatae
r
i
nt
treet
ee
a
yee
ee
et
Or
SX-303L/HE
|
AGC2Z2Z0V
Oaly
4
he
ow
BS
European
continent
model
with
AM-LW
band
tuner
|
|
SxX-303L/HEZ
|
AC220V
Only
OE
os
pee
toe!
aS
ay
|
-
=:
West
germany
model
with
AM-LW
band
tuner
|
@
This
service
manual
is
applicable
to
the
Ku
types.
For
servicing
of
the
thier
types,
please
refer
to
the
additional
service
manual.
cae
eae
®
Ce
manuel
d’instruction
se
ice
au
faode.
ite
réglage,
en
frangais:
@
Este
manual
ae
|
servicio
trata
del
metodo
de
ajuste
escrito
en
n
espaol.
CONTENTS
_
SPECIFICATIONS
.............0000002.
2
8.
P.C.
BOARDS
CONNECTION
DIAGRAM
rae
1
2.
FRONT
PANEL
FACILITIES.
.0..00..0.000..
3
9.
SCHEMATIC
DIAGRAM
...
ae
eee
ee
3.
PARTSLOCATION
.......
Sf
ade
ned:
4
10,
ELECTRICAL
PARTS
LIST..........
ae
4
BLOCK
DIAGRAM
so
ocds
acide,
5
11,
DIAL
CORD
STRINGING
..
ne
Ae
5.
CIRCUIT
DESCRIPTIONS
.
he
eae
ie
6
12.
ADJUSTMENTS
ae
eee
ata
gia
cane
20
6.
PACKING........0.-.
0.
-
Lees.
—
REGLAGE
........0...,
—-
aie
tee
7
EXPLODED
VIEW
AND
PARTS
List
eee
SO
_AJUSTE
ae
cewtewua
sete
tuk,
sates.
Oe
RBPIONEER
ELECTRONIC
CORPORATION
4-1.
Meguro
1-Chome,
Meguro-ku,
Tokyo
153,
Japan
PIONEER
ELECTRONICS
(USA)
INC.
1S25
£.
Dominguez
St.,
Long
Beach,
California
90810
UW.
S.A.
PIONEER
ELECTRONIC
[EUROPE]
N.V.
Keetbergiaan
1,
2740
Severen,
Belgium
PIONEER
ELECTRONICS
AUSTRALIA
PTY.
LTD.
173-184
Boundary
Road,
Braeside,
Victoria
3195,
GSE
YX
©
DEC.
1982
Primte
d
in
|
ea
Ut
1.
SPECIFICATIONS
Amplifier
Section
Continuous
Average
Power
Output
is
45
watts*
per
channel,
min.,
at
8ohms
from
40Hertz
to
20,000
Hertz
with
no
more
than
0.3%
total
harmonic
distortion.
Total
Harmonic
Distortion
(40
Hertz
to
20,000
Hertz,
8
ohms,
from
TAPE)
continuous
rated
power
output
ot
ta
ite;
Morahan
rir
ule
Ae
ee
ee
ance
No
more
than
0.3%
22.5
watts
per
channel
power
output
Sie
Ge
Rcaree
bani
wee
BL
Le
No
more
than
0.15%
|
watt
per
channel
power
output
ee
eee
ee
ee
eee
are
eae
No
more
than
0.2%
intermodulation
Distortion
(50
Hertz:
7,000
Hertz
=4:
1,
8
ohms,
from
AUX)
continuous
rated
power
output
ao
oh
fie
ais
Wns
fs
Beane
ek
ee
No
more
than
0.3%
Damping
Factor
(1
kHz,
8o0hms)......
6a
Sena
ne
tie
22
Input
(Sensitivity/Impedance)
PHONO
................
2.5
mV/50
kilohms
TAPE
PLAY
66.0%
3044454
4%
150
mV/50
kilohms
Phono
Overload
Level
(T.H.D.0.1%,
1,000Hz)
PHONG)
se
sak
ea
eo
eee
eae
ewes
150
mV
Output
Level
"PAPE
REG
cise
erie
ei
bcec
dale
tim
eae
ele,
4
150
mV
SPEAKER...............
A,
B,
A
series
B,
off
Frequency
Response
PHONO
(RIAA
Equalization)
bs
kasi
WOM
exes:
Mee
eee
30Hz
to
20,000Hz+0.5dB
TAPE
PLAY..........
15Hz
to
50,000Hz
*3dB
Tone
Control
BASS,
cei
ery
dee
seat
+9dB
(100Hz)
PPG
BEE
ery,
eis
hows
aarp
aie
+9dB
(10kHz)
Loudness
Contour
(Volum
control
set
at-
40dB
position)
Rr
a
ee
eee
+8dB
(100Hz),
+6dB
(10,000H2z)
Hum
and
Noise
(IHF,
short
circuited,
A
network)
PHONO
MM..............00c
ee
eee
71dB
"ARP
PLAY
ot
se
cw
ee
me
“es
eR
ede
97dB
FM
Tuner
Section**
Usable
Sensitivity
............0.
10.7dBf
(0.9nV)
50dB
Quieting
Sensitivity
MONO:
4
occcda
ee
ace
Be
Bans
&4
15.3dBf
(1.6uV)
STEREO
<4
4054
eed
was
37
.6dBf
(21uV)
Signal-to-Noise
Ratio
MON
Os.
oie
ees
6-228
ee
a
ed
75dB
(at
85dBf)
STEREO
«6-35.
hie
k
Chase
4
SS3
70dB
(at
85dBf)
Distortion
(at
65dBf)
MONO
TKAZ
cee
sc
bt
ee
es
0.3%
STEREO
kHz
...........0
000
eens
0.6%
Capture
Rate
24
Bee
cS
GEESE
EO
NS
,
2.5dB
Alternate
Channel
Selectivity
(400kHz)
.......
50dB
Stereo
Separation
(1kHz).................
35dB
Frequency
Response
.......
30Hz
to
15kHz,
76
dB
Spurious
Response
Ratio
.............,...
70dB
Image
Response
Ratio
...............
0005
45dB
IF
Response
Ratio
.................204.
100dB
AM
Suppression
Ratio
.............-...0.
45dB
Subcarrier
Product
Ratio........
2.0002
ee
eae
31dB
Muting
Threshold
.............-.
27d
Bf
(6.3uV)
AM
Tuner
Section
Sensitivity
IHF,
Loop
antenna................
3202
/m
IHF,
Ext.antenna...........
Beaty
ab-werds
tele
30uV
Selectivity
.......
hae
aceste
a
ah
e
Aine
es
25dB
Signal-to-Noise
Ratio...
2...
0.0...
ee
ee
43dB
Image
Response
Ratio
.............00008-
40dB
IF
Response
Ratio
.............
0000
bees
45dB
Antenna
............000008
AM
Loop
Antenna
Miscellaneous
Power
Requirements
............
AC
120
V,
5OHz
Power
Consumption
...
190
Watts(UL),
225
VA(CSA)
Dimensions
........
420
(W)
x
98
(H)
x
214(D)
mm
16-9/16(W)
X
3-7/8(H)
X
8-7/16(D)
in
Weight
(without
package).............
5
kg
(11
Ib)
Furnished
Parts
FM
T-type
Antenna
...........0000
2
eee,
|
AM
Loop
Antenna
............
0.0.00
cee
.
1
Operating
Instructions
............0
2.008
ee
el
*Measured
pursuant
to
the
Federal
Trade
Commission’s
Trade
Regulation
rule
on
Power
Output
Claims
for
Amplifier.
**FM
muting
functions
with
this
unit
when
the
signals
are
veak.
The
unit’s
internal
wires
are
therefore
treated
so
that
the
sirrals
are
not
muted
when
the
sensitivity
is
measured.
NOTE:
Specifications
and
design
subject
to
possible
modification
wih
out.
notice.
2.FRONT
PANEL
FACILITIES
)
a
AM
sa
ec
@)
POWER
SWITCH
Push
this
to
switch
on
and
off
the
unit’s
power.
Power
is
supplied
at
the
depressed
(=)
switch
position
(ON)
and
turned
off
at
the
released
(IL)
position
(OFF).
(2)
HEADPHONE
JACK
Connect
the
plug
on
the
stereo
headphones
to
this
jack
when
listening
to
sound
through
headphones.
(3)
TONE
CONTROLS
BASS
:
The
bass
is
increased
when
this
control
is
rotated
clockwise
from
the
center
position
and
reduced
when
rotated
counterclockwise.
TREBLE
:The
treble
is
increased
when
this
control
Is
rotated
clockwise
from
the
center
position
and
reduced
when
rotated
counterclockwise.
(4)
BALANCE
CONTROL
This
is
normally
kept
at
its
center
position.
It
is
rotated
when
the
volume
of
sound
delivered
through
the
left
and
right
channels
of
the
speakers
or
headphones
differs.
The
right
channel
volume
is
reduced
when
the
control
is
rotated
toward
the
LEFT
from
the
center
position
while
the
left
channel
volume
is
reduced
when
it
is
rotated
toward
the
RIGHT.
(S)
FUNCTION
SWITCHES
PHONO
:
Press
when
listening
to
records.
FM
:
Press
when
listening
to
FM
broadcasts.
AM
:
Press
when
listening
to
AM
broadcasts.
(6)
TAPE
(ADPT)
SWITCH
This
is
depressed
when
using
a
tape
deck
or
adaptor
unit
connected
to
the
rear
panel
TAPE/ADAPTOR
jacks.
@
LOUDNESS
SWITCH
Depress
this
switch
to
the
ON
position
when
Sistening
to
sound
at
a
low
level
of
volume.
This
will
enhance
the
bass
and
treble
and
give
more
life
to
the
sound
even
at
a
low
volume.
EO
ASCEVER
$x-3903
i
3h
so
a2 aa
36
i
4
1a
Ud
bos
ties
it
al
'
pperregerrege
@rrna
+
|
}e
fe
®
@
@
OF
Jere
100
caf
1
bea
VOLUME
CONTROL
Use
this
to
adjust
the
volume
of
the
sound
delivered
through
the
speakers
or
headphones.
The
volume
is
increased
when
this
control
is
rotated
clockwise
from
the
minimum
“0”
position.
@Q)
TUNING
INDICATOR
(TUNING)
This
lights
up
to
indicate
that
an
FM,
AM
station
has
been
tuned
in.
STEREO
INDICATOR
(STEREO)
This
lights
up
automatically
when
an
FM
station
broad-
casting
in
stereo
has
been
tuned
in.
d)
SPEAKERS
SWITCHES
These
are
used
to
select
the
speakers
through
which
you
will
listen
to
the
sound.
The
selected
speakers
are
now
working.
A:
The
sound
is
heard
from
the
speakers
connected
to
the
speaker
A
terminals
on
the
rear
panel.
B:
The
sound
is
heard
from
the
speakers
connected
to
the
speaker
B
terminals
on
the
rear
panel.
No
sound
will
be
heard
when
SPEAKERS
A
and
B
switches
are
both
released.
This
is
the
position
at
which
the
sound
can
be
heard
through
the
headphones.
NOTE:
No
sound
will
be
heard
through
the
speakers
when
both
the
A
and
B
switches
are
depressed
if
only
one
set
of
speakers
has
been
connected
to
either
the
A
or
B
SPEAKERS
terminals.
(2
FREQUENCY
SCALE
This
indicates
the
frequency
of
the
broadcasting
station
(FM,
AM).
The
top
level
figures
(88
~
108)
indicate
the
FM
band.
The
bottom
level
figures
(55
~
160)
indicate
the
AM
band.
(3)
TUNING
KNOB
Rotate
this
knob
to
pick
up
stations
(FM,
AM).
POWER
INDICATOR
3.
PARTS
LOCATION
NOTES:
e
Parts
without
part
number
cannot
be
supplied.
e
The
A,
mark
found
on
some
component
parts
indicates
the
importance
of
the
safety
factor
of
the
part.
Therefore,
when
replacing,
be
sure
to
use
parts
of
identical
designation.
e
For
your
Parts
Stock
Control,
the
fast
moving
items
are
indicated
with
the
marks
kx
and
x,
**x
GENERALLY
MOVES
FASTER
THAN
kx.
This
classification
shall
be
adjusted
by
each
distributor
because
it
depends
on
model
number,
temperature,
humidity,
etc.
Front
Panel
View
Speaker
knob
—--———-—__--—____--
Bonnet
AAD-608
ANE
410
Front
pane!
assembly
ANM-293
=
;
SOF
ee
om
.
ee
i.
r
oes
_
ce
ores
|
owe
é
|
eCo--—
Tuning
knob
6g
EE
;
|
on
AAA084
Power
knob-————~—--__-_—_—___-.-__#
:
cae
y
ry
os
:
€
2
Fe
sa
7
:
‘
AAD-605
ace
tf
to
nae
ioc
[Moe
:
cra
pee
Phone
jack
—-—————---—___—___
Function
knob
A
AKN-045
(TAPE,
LOUDNESS)
AAD-606
Knob
B
a
-
——-___
|
————_—_———.
Function
knob
B
(BASS,
TREBLE,
BALANCE)
(PHONO,
FM,
AM)
AAB-317
AAD-607
Rear
Panel
View
~———
—_______-__-——-
/\
aCsocket
Lv
AKP-039
Earth
terminal
Rear
panel
Complex
terminal
—-_-————
(eee
A
AC
power
cord
AKX-073
ADG-073
Top
View
Complex
asermrbly
GWM-265
/\i%*
Fuse
(T2.5A)
-
AEK-123
[\*
Power
transformer
(120V)
FM
Front-end
ATT-944
AWB-O14
kk
fC
NSt
53L
/\
we
Push
switch
(POWER)
ASG-541
*k*
Functionsw
itch
ASG-412
Switch
assembly
7777
4.BLOCK
DIAGRAM
FM
FRONT
END
(173)
FM.IF
AMP
—
|
soon
BAL
FM
|
750
UNBAL
[
GND
AM
LOOP
ANT
LED
DRIVER
Re
AaRaeey
FM
FRONT
END
L
mm
|
(2/3)
FM
FRONT
END
(373)
AM
FRONT
END
FM
(Uch)
FM(Rch)
|
|
S1-|
Si-2
|
SI-3
S1-4
Si-5
POWER
ON/OFF
MUTING
PLAY
—
ie
a
Heer:
SOE
e)
ae
TONE
CONTROL
“igy.
“Se
Pes.
VR2-2,
2-3
EQUALIZER
AMP
0
°
eee
+82
(1/4)
i
ie
Se
;
g
USOmv|
Qi7|
poi7
06
+B2
AM
+BI
18.9V|
PHONES
+B2
FM
2
6
|
!
|
|
|
!
{
!
O
:
VR
I
0)
+B2
:
O
:
O
2
ii
(3/4,4/4)
(2/2)}
(2/4)
POWER
AMP
=
$1-4
$1-5
peene
(2/2)
(2/2)
Rch
REC
PLAY
ia
ae
TO
POWER
SUPPLY
&
PROTECTOR
Reh
SPEAKERS
+B1(35V)
SP
B
S101
°
POINTER
AC
120V
cS
ne
oe
e;
a8
08
1)
N
SP
A
“oy
z
;
SI-|
;
FUNCTION
(PHONO)
ON-OFF
|
9
bLanenmne
S1-2
:
FUNCTION
(FM)
Si-3.:
FUNCTION
(AM)
|
$1-4
:
TAPE
MONITOR
ON
-
OFF
S2-1:
SPEAKERS
A
(ON
—
OFF
SIO
:
POWER
ON
—
OFF
S!-5
:
LOUDNESS
ON
-
OFF
S2-2:
SPEAKERS
8
ON
—
OFF
5.
CIRCUIT
DESCRIPTIONS
FM
Front
End
A
unitized
variable
capacitor
type
front
end
unit
1s
used
consisting
of
an
FET
RF
single
stage
amp,
local
oscillator/mixer
IC
and
an
IF
trans-
former.
FM
IF
Amp,
Detector
and
MPX
Circuit
A
2-transistor
IF
amp
with
ceramic
filter
is
used
and
the
next
stage
has
an
IC
(M51533L)
contain-
ing
the
FM
IF
detector
and
MPX
circuit.
The
block
diagram
of
IC
M51588L
is
shown
in
Fig.
5-1.
This
IC
uses
a
peak
detection
method
which
can
be
adjusted
with
a
single
coil.
The
PLL
method
is
employed
to
reconstitute
the
38kHz
sub-carrier
for
the
MPX
circuit.
The
IF
signal
is
input
at
pin
1
and
the
detection
output
is
obtained
from
pin
5.
The
detection
out-
put
passes
through
the
muting
Q4,
goes
to
pin
9,
passes
through
the
MPX
circuit
and
the
stereo
signals
are
obtained
from
pins
11
and
12.
In
addition,
this
unit
detects
the
presence
or
absence
TUNING
y)
|
Z
T.P
6
TP
|
at
©
ms
3rd
1F
AM
oO
FM
S1-3
f
ai
L
OUT
Fig.
5-1
paar,
f
(6)
PHASE
\/2
\/2
ile
Shan
COMPARATOR|
|
“°°
DIVIDER
DIVIDER
1
!
nes
L
LEVEL
INPUT
@)
alae
BUFFER
CIRCUIT
STEREO
(13)
:
SWITCH
Fiancee
J
IND
7
MPX
On
of
a
pilot
signal
to
automatically
switch
between
stereo
and
mono
reception
by
R14
which
is
con-
nected
to
pin
14.
When
a
stereo
signal
is
received,
—
pin
13
drops
to
the
low
level
to
light
the
stereo
indicator.
When
pin
2
is
grounded,
the
PLL
VCO
and
FM
IF
operation
stop
(for
AM).
FM
Muting
and
LED
Driver
With
this
unit,
muting
is
automatically
activated
when
the
antenna
input
drops
below
10uV.
As
the
antenna
input
decreases,
the
voltage
at
pin
3
drops,
Q5
is
turned
off
and
Q6
is
turned
on.
As
a
result,
the
gate
voltage
of
Q4
drops,
Q4
is
turned
off
and
the
detector
output
circuit
is
blocked
(Fig.
5-1).
When
an
FM
or
AM
station
is
tuned
in,
the
base
potential
of
Q5
is
raised,
Q5
is
turned
on
and
the
tuning
indicator
lights.
A
RI4
LL]
M5i533L
(10)
:
+B2
1/2
STEREO
PHASE
FM
1F,
Detector
and
MPX
circuit
AM
Tuner
This’
uses
a
variable
capacitor
type
tuning
circuit
composed
of
three
transistors,
a
2-tran-
sistor
front
end
and
a
single
transistor
AM
IF
detector.
AF
Section
The
equalizer
circuit
has
a
low-noise
operation
amp
(2
channel)
M5218P.
The
power
amp
has
a
45;
watt
output
power
IC
STK4141-2S
(See
Fig.
5-4).
|
The
tone
control
circuit
is
placed
in
the
negative
feedback
loop
of
the
power
amp.
Protective
Circuits
This
unit
has
a
circuit
to
detect
DC
voltages
at
the
power
amp
outputs
and
a
muting
circuit
that
operates
when
power
is
turned
on
and
off.
Fig.
5-2
shows
the
construction
of
the
DC
voltage
protection
circuit.
When
a
DC
voltage
VOLUME
BALANCE
VOLUME
TO
POWER
AMP
appears
at
the
power
amp
output,
either
Q13
(plus)
or
Q14
(minus)
is
activated
depending
on
the
polarity
of
the
DC
voltage
and
a
trigger
is
applied
to
D15.
This
turns
on
D15,
+B1
is
shorted,
the
fuse
on
the
primary
side
is
cut
and
the
power
supply
circuit
is
shut
off.
Fig.
5-3
shows
the
power
on/off
muting
circuit.
Time
constant
t,
is
longer
than
t,
so
that
imme-
diately
after
the
power
is
turned
on,
the
emitter
potential
of
Q15
exceeds
its
base
potential,
Q15
is
turned
on
to
activate
Q16
and
Q17
and
ground
the
signal.
A
few
seconds
later,
the
base
potential
of
@15
rises
to
turn
off
Q15
along
with
Q16
and
Q17.
When
the
power
is
turned
off,
the
charge
of
C161
passes
through
D18;
it
is
almost
completely
discharged
in
an
instant
to
make
the
base
potential
of
Q15
zero.
However,
because
the
charge
of
C160
remains,
Q15
is
turned
on
and
muting
is
activated
in
the
same
manner
as
when
power
is
turned
on.
TO
SPEAKER
SWITCHES
+B3
tr,t2
*
time
constant
Fig.
5-3.
Power
ON/OFF
muting
circuit
f--------
=
12
11
Vee
t
|
!
I
|
|
IN
1(+)0
|
21
INi(-)
©
|
1
I
!
Pe
ie
l
|
[
|
I
I
70
|
;
|
|
;
{
eee
OO
Oe
HO
—
—O-
3 5
6
8
9
10
13
14
GND
MUTING
Vee
OUT!
OUT2
VEE
6.
PACKING
4
Fig.5-4
Equivalent
circuit
of
power
IC
Mark
No.
von
°
=
Part
No.
AHA-335
ARB-526
ATB-076
ADH-005
AHE-107
iT
[5
GND
@
IN
2(+)
=
IN2(-)
=
|
|
|
|
|
O
{
|
O
i
|
|
|
|
|
|
|
|
|
|
|
pieces
Description
Side
pad
Operating
instructions
(English)
Loop
antenna
ssembly
T-type
antenna
Packing
case
Mees
co et
pee
Neca
an
NSisepane”
7.
EXPLODED
Mark
[>
[>
>
[>
x
No.
sda
ade
=
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
26.
27.
28.
Part
No.
ANE-410
BBZ30PO80F
ZK
ATT-944
PMZ30PO60F
MC
AAD-608
VMZ30PO60F
MC
NK9SOFUC
AAB-317
NK7OFUC
AAA-084
AAB-316
ANM-293
AAD-607
AAD-606
ASG-541
AAD-605
AEC-784
AXA-373
AEC-471
MTZ30P100FZK
AEK-123
AKP-039
ADG-073
GWM-265
AKN-045
SUJ8LY
XSF
ACG-017
BBT3SOPO80FZK
VIEW
AND
PARTS
LIST
NOTES:
e
Parts
without
part
number
cannot
be
supplied.
e
The
A
mark
found
on
some
component
parts
indicates
the
importance
of
the
safety
factor
of
the
part.
Therefore,
when
replacing,
be
sure
to
use
parts
of
identical
designation.
e
For
your
Parts
Stock
Control,
the
fast
moving
items
are
indicated
with
the
marks
ke
and
x.
tke
GENERALLY
MOVES
FASTER
THAN
x.
This
classification
shall
be
adjusted
by
each
distributor
because
it
depends
on
model
number,
temperature,
humidity,
etc.
Description
Mark
No.
Part
No.
Descriptions
Bonnet
50.
Speaker
switch
assembly
Screw
(3
x
8)
51.
Switch
holder
Power
transformer
(120V)
52.
Pully
assembly
Screw
(3
x
6)
53:
LED
assembly
Speaker
knob
54.
Earth
Screw
(
3
x
6)
55.
Mounting
plate
Nut
56.
Pully
assembly
Knob
B
(BASS,
TREBLE,
57.
Pully
assembly
BALANCE)
58.
Pully
holder
Nut
59.
Headphone
jack
assembly
Tuning
knob
60.
Chassis
Knob
A
(VOLUME)
61.
Bottom
Plate
Front
panel
assembly
62.
Binder
Function
knob
B
(PHONO,
63.
Earth
terminal
FM,
AM)
64.
Rear
panel
Function
knob
A
(TAPE,
LOUDNESS)
65.
Tuning
drum
Push
switch
(POWER)
66.
Smoother
67.
Pointer
holder
Power
knob
68.
Pointer
assembly
Cabinet
bumper
69.
Heat
sink
Tuning
shaft
Nylon
rivet
70.
Wire
holder
Screw
(3
x
10)
Fuse
(T2.5A)
AC
socket
AC
power
cord
Complex
assembly
Phone
Jack
(PHONES)
Speaker
switch
Ceramic
(0.01)
Screw
(3
x
8)
A
AY],
A
|
|
|
|
|
ince
of
the
:
of
identical
the
marks
is
on
model
assembly
kK
assembly
y