Sherwood EQ-3050C User manual
SERVICE
MANUAL
EQ-3050C
STEREO
GRAPHIC
EQUALIZER
reuse
mt
GRAPHIC
EQUALIZER
EQ-3050C
a
CONTENTS
#
Safety
PreCAUtiONS
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11
Specifications
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Printed
Circuit
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Block
Diagram
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4
Electrical
Parts
List
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15
Wiring
Diagram:
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IC'S
Lead
Identification
&
Internal
Diagram
---18
Circuit
Description
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6
Transistors
Lead
Identification
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20
Mechanica!
Parts
List
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10
Schematic
Diagram
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21
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Sherwood
SAFETY
PRECAUTIONS
WARNING
Before
servicing
this
unit,
familiarize
yourself
with
the
following
precautions:
1.
Many
electrical
and
mechanical
parts
in
this
chassis
have
special!
safety
characteristics
that
often
pass
unnoticed
and
the
protection
afforded
by
them
cannot
necessarily
be
obtained
by
using
replacement
components
rated
for
higher
voltge,
wattage,
etc.
Replacement
parts
that
have
these
special
safety
characteristics
are
identified
in
this
manual
and
its
supplements:
electrical
components
having
such
features
are
identified
by
/\
in
the
schematic
diagram
and
the
parts
list.
Before
replacing
any
of
these
components,
read
the
parts
list
in
this
manual
carefully.
The
use
of
substitute
replacement
parts
that
do
not
have
the
same
safety
characteristics
as
specified
in
the
parts
list
may
create
shock,
fire,
or
other
hazards.
2.
Before
returning
the
set
to
the
customer,
always
do
an
AC
leakage
current
check
on
the
exposed
metal
parts
of
the
cabinet,
such
as
terminals,
screw
heads,
and
metal
overlays,
to
be
sure
the
set
is
safe
to
operate
danger
of
electrical
shock.
Plug
the
AC
line
cord
directly
into
a
120
V
AC
outlet
(120
V
AC
version
only).
(Do
not
use
a
line
isolation
transformer
during
this
check.)
Be
sure
your
AC
voltmeter
has
a
sensitivity
of
5000
{2
per
volt
or
greater.
Then
connect
a
1500
2
10
watt
resistor,
paralleled
by
a
0.15
utF
150
V
AC
capacitor,
between
a
known
good
earth
ground
(such
as
a
water
pipe,
or
conduit)
and
the
exposed
metalic
is
parts,
one
at
a
time.
Measure
the
AC
voltage
across
the
combination
of
a
1500
Q
resistor
and
a
0.15
utF
capacitor.
Reverse
the
AC
plug
at
the
AC
outlet
and
repeat
AC
voltage
measurements
for
each
exposed
metalic
part.
Voltage
measured
must
not
exceed
0.75V
RMS.
This
corresponds
to
0.2
mA
AC.
Any
value
exceeding
this
limit
constitutes
a
potential
shock
hazard
and
must
be
corrected
immediately.
At
5000
©
per
volt
or
greater
sensitivity,
the
reading
should
not
exceed
0.75
V.
AC
Outtet
AC
Voltmeter
Good
earth
ground,
such
as
a
water
pipe
or
conduit.
0.15
2F
150
V
AC.
Place
the
probe
on
each
exposed
metalic
part.
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8
at}
SPECIFICATIONS
Description
Unit
Normal
Limit
Equalizer
range
(7
bands
x
2)
at
60
Hz,
150
Hz,
400
Hz,
1
kHz,
2.4
kHz,
6
kHz,
15
KHz
dB
8
842
Center
frequency
(Fo)
%
Fo
Fo+2
Total
harmonic
distortion
:
at
1
kHz,
all
controls
flat,
output
1
V.
%
0.01
0.02
at
1
kHz,
all
controls
max,
input
200
mV.
%
0.07
0.09
at
1
kHz,
all
controls
flat,
output
2
V.
%
0.005
0.01
|
_at
1
kHz,
all
controls
min.,
output
0.2
V
%
0.07
|
0.1
insertion
loss,
controls
flat
dB
-0.5
-0.5+2
Maximum
output
voltage
at
1
kHz,
THD
0.5%,
R/L
47
kohm
Vv
>6
>5
Frequency
responce
at
-3
dB
Hz
20
—
80000
40
-
50000
Signal
to
noise
ratio
(IHF
“A”
WTD/UNWEIGHTED)
dB
>95/90
>90/85
General
POWer
COMSUMPTIONS
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19W
Dimensions
(W
xHx
D)
ne
re
re
re
rer
ee
rn
oe
rrr
Power
requirements
:
A:
120
V
60
Hz
for
American/Canadian
version
B
:
120/220
V
60/50
Hz
multy
voltage
version
(switchable)
D
:
230
V
50
Hz
German/Gerneral
European
version
E
:
240
V
50
Hz
for
UK/Australian
version
G
:
220
V
50
Hz
for
Other
Area
Notes
:
440
x
80
x
245
mm
(17.3
3.19.6
inch)
Weight
(Net)
<--:ssssressssssesesseerseeseseneeaeneesessesesecessesersssnassenesnsesacnecnsnrcaesesansnenaseenesgsgts
3.1
kg
(6.8
Ibs)
1.
Nominal
specs
represent
the
design
specs.
All
units
should
be
able
to
apprcximate
these
some
will
exceed
and
some
may
drop
slightly
below
these
specs.
Limit
specs
represent
the
absolute
worst
condition
that
still
might
be
considered
acceptable
:
in
no
case
should
a
unit
fail
to
meet
limit
specs.
2.
This
manual
is
based
on
the
European
(D)
standard,
and
provides
information
on
regional
circuit
modification
throught
the
use
of
altemate
schematic
diagram
or
wiring
diagram,
and
information
on
regional
component
variations
therought
the
use
of
poarts
lists.
Design
and
specifications
subject
to
change
without
notice.
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oniens
arsine
saersaenaiese
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BLOCK
DIAGRAM
TAPE
MONITOR
ON:
TAPE
SIGNAL
OFF
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SIGNAL
BUFFER
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Ic303
Ic304
Model
No.:
EQ-3050C
Lco7522
POWER
SUPPLY
KEY
|
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LED
ON/OFF
WIRING
DIAGRAM
Model
No.:
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1.
Pin
Configuration
CIRCUIT
DESCRIPTION
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VLOAD
—Oo1
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FIP
SEGMENT
FIP
DIGIT
7O-—
1
sO
1
ea
4O-—
3Q——
2
S|
1O——
Vop
(+
N.C
O——_
DEFEAT
O——
TAPE
MONITOR)
N.C
O——
Slo
CLOCKO———+
DATA©O-————
POWER
OUT
Q-——
RESET
Q———
N.C
O——
NCO}
Avss
Q-——
MUTE
OUTOQ-——-—
60Hz
——
150Hz
400Hz
“80
79
78
77
76
75
O
oO
On
Oo
a
fF
WwW
ND
=_
—
Oo
26
27
28
31
sL
ae
14
“I
wo
32
N-—/
_
FIP
SEGMENT
r
71
70
69
68 67
66
65
64
63
62
61
60
59
58
57
56
55
54
53
52
51
50
49
48
47
46
45
44
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N
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Key
OUTPUT
coment,
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=)
+———C_)
Vop
iC)
Key
INTPUT
Sess
tO
N.C
+————-C_)
DIGILINK
|)
POWER
DOWN
t+)
MEMORY
iC)
HEAVY/CLEAR
t+———C_)
SOFT/JAZZ
lt)
VOCAL/POPS
iC)
CLEAR/MOVIE
1kHz
O————_|
2.4kHz
(J
6kHz
(>
15kHz
(©)
Avop
©)—-———}
8
AVref
C-
N.C
O-———-—
N.C
C)}———
Vec
C}———
8
X-TAL
O-——+
8
X-TAL
QQ
&
PRESET
A
O————+
PRESET
B
()—-__
USER
+
CAR/ROCK
()———+
8
VISUAL/HP.ST
©)
RM
ACA
TOR
EEO
NA
SEN
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MOE
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IES
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SET
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Block
Diagram
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3.
Pin
Funtion
Description
1~7
FIPO~FIP6
Gride
signal
output
for
FIP
Vdd
+5
V
Power
supply
9
Ground
DEPEAT
Output
for
driving
DEFEAT
LED.
(At
"H",
it
is
active.)
TAPE
MON.
_
|
Output
for
driving
TAPE
MONITOR
LED.
(At
"H",
it
is
active.)
12
GND
|
Ground
13
|
ST1
Chip
enable
output
to
LC7821
for
DEFEAT
and
TAPE
MONITOR.
14
SCK
Clock
output
to
LC7821
and
LC7522.
15
SO
Data
output
to
LC7821
and
LC7522.
16
STAND
BY
When
the
power
is
turned
on,
"H"
is
output.
When
the
power
is
turned
off,
"L"
is
output.
7
RESET
When
the
power
is
supplied,
"L"
is
output
for
a
moment
and
is
changed
to
"H".
18~19
Not
used
!
(These
pins
should
be
left
open
circuit).
20
AVss_-
|
Analog
ground
21
MUTE
When
the
power
is
turned
on
or
off
and
each
function
starts
to
perform,
"
L"
is
output.
In
other
cases,
"H"
is
output.
60
Hz
input
from
A/D
converter.
150
Hz
input
from
A/D
converter.
ANI4
400
Hz
input
from
A/D
converter.
1
kHz
input
from
A.D
converter.
2.4
kHz
input
from
A/D
converter.
6
kHz
input
from
A/D
converter.
15
kHz
input
from
A/D
converter.
AVdd
Analog
+5
V
power
supply.
Reference
voltage
supply
of
+5
V.
Ground
NC
Not
used!
(These
pins
should
be
left
open
circuit.)
33
Vss
Ground
34~35
X-TAL
Pins
for
4.7
MHz
crystal
oscillator.
36
RESET
A
Output
for
driving
RESET
A
LED.
(At"
H",
it
is
active.)
37
Output
for
driving
RESET
B
LED.
(At
"
H",
it
is
active.)
38
USER
Output
for
driving
USER
LED.
(At
"H",
it
is
active.)
39
CAR/ROCK
Output
for
driving
CAR/ROCK/USER
1
LED.
(At
"H",
it
is
active.)
40
VISUAL/HP.
ST
|
Output
for
driving
VISUAL/HP.
ST/USER
2
LED.
(At
"H",
it
is
active.)
41
Output
for
driving
CLEAR/MOVIE/USER
3
LED.
(At
"H",
it
is
active.)
42
Output
for
driving
VOCAL/POPS/USER
4
LED.
(At
"H",
it
is
active.).
SOFT/JAZZ__|
Output
for
driving
SOFT/JAZZ/USER
5
LED.
(At
"H",
it
is
active.)
iol
|
44
|
HEAVY/CLASSIC|
Output
for
driving
HEAVY/CLASSIC/USER
6
LED.
(At
"H",
it
is
active.)
=
MEMORY
Output
for
driving
MEMORY
LED.
("H"
and
“L"
is
output
for
500
ms
alternately.)
PWR.
DN.
Power
down
input.
(At
"H",
it
is
active.)
DIGI
LINK
Input
for
controlling
DIGI
LINK.
Ground
i
"
KEY
IN
Data
input
for
KEY
SCAN.
Vdd
+5
V
power
supply.
53~58
KEY
OUT
Data
output
for
KEY
SCAN.
59~70
FIP16~FIP27
|
Segment
signal
output
for
FIP.
-30
V
power
supply.
FIP15
Segment
signal
output
for
FIP.
73~80
FIP7~FIP14
Grid
signal
output
for
FIP.
RNASE
Ih
EEDA
EPP
ee
OTOP
EI
ASN
AA
CEN
IEE
I
EERE
ITS
A
SET
TI
IT
NOTES
Ref.
No.
Description
PACKAGE
Cushion
Poly
Film
Soft
PE
Box
Carton
ACESSORIES
Cord
RCA
2P
Cord
RCA
1P
Manual
instruction
Manual
Instruction
Manual
Instruction
CABINET&CHASSIS
4
Window
Fluorescent,
Acryl,
Win
Color
Window
Fluorescent,
Acryl,
Win
Color
2
Button
Function,
ABS,
Black
Button
Function,
ABS,
Black
3
Decoration
Cap
"R",
ABS,
Black
4
Indicator
“"B",
ABS,
White
5
Panel
Front,
ABS,
Black
Panel
Front,
ABS,
Black
6
Button
Level
"A",
ABS,
Black
7
Button
Level
“B",
ABS,
Black
8
Badge
Inkel,
ABS,
Black
Badge
Sherwood,
ABS,
Black
9
Indicator
"A"
ABS,
White
40
Button
Select,
ABS,
Black
abl
Indicator
"C",
ABS,
White
12
Button
Power,
ABS,
Black
13
Cover
Top,
SECC,
0.8t
14
Space
Supprot,
ABS,
White
15
Chassis
Main,
SECC,
0.8t
16
Foot,
Gold
Ring,
ABS,
Black
Foot,
Hat
Stamping,
ABS,
Black
17
Foot,
ABS,
Black
18
Heat
Sink,
Regulator
TR.,
Aluminum
19
Outlet,
ABS,
Black
Outlet,
ABS,
Black
Outlet,
ABS,
Black
20
Switch
Selector,
ABS,
Black
21
Jack
RCA,
2P,
ABS,
Black
22
Jack
RCA,
4P,
ABS,
Black
23
Chassis
Back,
SECC,
0.8t
Chassis
Back,
SECC,
0.8t
Chassis
Back,
SECC,
0.8t
Chassis
Back,
SECC,
0.8t
Chassis
Back,
SECC,
0.8t
24
Cord
Holder,
ABS,
Black
25
Cord
AC
Power,
ABS,
Black
Cord
AC
Power,
ABS,
Biack
Cord
AC
Power,
ABS,
Black
26
Adapter
AC,
ABS,
Black
PRODUCT
SAFETY
NOTICE
Each
precaution
in
this
manual
should
be
follower
during
servicing.
Components
identified
with
the
IEC
symbol
4,
in
the
parts
list
and
the
safety
can
be
of
special
significance.
When
replacing
a
component
identified
with
4,
use
only
the
replacement
parts
designated,
or
parts
with
the
same
ratings
of
resistance,
wattage
or
voltage
that
are
designated
in
the
parts
list
in
this
manual.
Leakage
current
or
resistance
measurements
must
be
made
to
determine
that
exposed
parts
are
acceptably
insuiated
from
the
supply
circuit
before
retuning
the
product
to
the
customer.
MECHANICAL
PARTS
LIST
Parts
No.
9722027310
9715000120
049605172121
4328200510
4328204510
9007018090
9007018092
9007018091
048553020611
048553020612
048543062211
048543062212
8583005710
8553021020
048501034311
048501034312
048543062111
048543063011
048535038511
048535042011
8553021010
8543062310
8553021030
8543062910
046122021011
6705004220
6121612110
046033102611
046033102511
6033102510
7505202410
4448105510
4448103210
4448103610
4618006610
4438105010
4438103110
046102042111
046102042121
046102042151
046102042161
046102042191
6518002310
4308007310
4308001410
4308000430
4428300410
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Version
Ref.
No.
Sw301
SW302
SW303
Sws304
SW305
SW306
SW307
Sws308
KS
Sw30g
SW310
12)
Sw311
SW312
Sw313
KS
SW314
A,B,D,E,G
Sw315
KS
Sw316
A,B,D,E,G
SW317
o
KS
S1
A,B,D,E,G
$3
S6
KS
A,B,D,E,G
si
$2
S4
Ss
KS
A,B,0,E,G
KS
A
D
B(PT
INDO)
KS
A
D
E
B(PT
INDO)
KS
A
D
B(PT
INDO)
10
Description
Switch
Tact,
Carstereo/Rock
Switch
Tact,
Visval/Headphone
Switch
Tact,
Clear/Movie
Switch
Tact,
Vocal/Pops
Switch
Tact,
Soft/Jazz
Switch
Tact,
Heavy/Classic
Switch
Tact,
Memory
Switch
Tact,
EQ
Defeat
Switch
Tact,
Display
Level
Switch
Tact,
Display
Mode
Switch
Tact,
Shift
Switch
Tact,
Tape
Monitor
Switch
Tact,
Power
Switch
Tact,
a,
Level
Up
Switch
Tact,
<¢,
Frequancy
"L”
Switch
Tact,
y,
Level
Down
Switch
Tact,
p
,
Frequancy
"R"
Screw
Extena!
#2BTC
3x8B
BSAM
4x8B
#1PT3x10B
Screw
Internal
#2BTC
3x8B
#2BTC
3x8Y
#2WPTC
3x8Y
#2WPTC
3x14Y
P.C.Board
Main
P.C.Board
Front
P.C.Board
Front-1
Parts
No.
4658003710
4658003710
4658003710
4658003710
4658003710
4658003710
4658003710
4658003710
4658003710
4658003710
4658003710
4658003710
4658003710
4658004410
4658003710
4658004410
4658003710
8109230083
8109440083
8119130103
8109230083
8109230081
8159230081
8159230141
4001500200
4001500210
4001500220
Q'
Baas
aa
on
ee
own
awn
nn
nin
16
CABINET
&
CHASSIS
EXPLODED
VIEW
Model
No.:
EQ-3050C
padinvan
nensecnbneennncrtatcen
soe
voiainnet
tfha
PRINTED
CIRCUIT
BOARDS
PC
Board
Main
(4001500200B)
Model
No.:
EQ-3050C
OUTLET
AC
VOLTAGE
SEL!
—
[D.E[T
1tA/250V
P.C
Board
Front
-1
(4001500220B)
FRONT
B‘D-1
40015002208
40015002108
ELECTTRICAL
PARTS
LIST
PRODUCT
SAFETY
NOTICE:
Products
marked
with
/\
have
special
characteristics
important
to
safety.
If
you
replace
of
these
components
read
carefully
the
product
safety
notice
in
the
manual.
Resistor/Capacitor
Tolerance,
D:(+
0.5%),
J:(+
5%),
K:(+
10%),
M:(
+
20%),
2:(+80,
-20%).
:
if
i
+
Ref.
No.
Description
Parts
No.
Q
Version
Ref.
No.
Description
Parts
No.
Q'
Version
i
Ass'y
P.C.Board
Main
F101
SB
200
mA,
250
V
5508101130
1
KS
‘
Capacitors
IC's
i
€101-C112
Ceramic
Tubular
4100
pF
SOV
K
3519101935
11
10104
LC7821
2168017132
1
i
C113/C114
Electrolytic
SG
1
oF
5SOV
M
3479310971
2
{C102
LC7522
2168017122
1
i
C115
Electrolytic
SA
47
wR
SOV
M
3479247971
1
1C103/104
KIA75559S/KIA4559S,
OP
AMP
2168206103
2
:
C116
Electrolytic
SG
47
yF
25V
M
3479347041
1
1C105
KA7818,
Regulator
2168602110
1
|
C117
Electrolytic
SG
1
uwF
SOV
M
3479310971
1
1C106
KA7918,
Regulator
2168602115
4
C118
Electrolytic
SG
47
ye
O25V
M
3479347041
1
C119/C120
Electrolytic
SG
1
wF
SOV
M
3479310971
2
Transistors
C121/C122
Electrolytic
SG
47
yF
25V
M
3479347041
2
Q101/D102
2SD1302S,
NPN,
Silicon
2008610102
2
C123/C124
Electrolytic
SG
22
uF
SOV
M
3479322971
2
Q103
DTA114YS/KRA107M
2238006103
1
C125/C126
Ceramic
Tubular
330
pF
SOV
K
3519331935
2
Q104
OTC114YS
2208622106
1
C127/C128
Ceramic
Tubular
47
w
SOV
J
3519470935
2
Q105-Q119
KTC1815Y/KTC3198,
NPN,
Silicon
2208606104
15
C129/C130
Ceramic
Tubular
330
pp
SOV
K
3519331935
2
Q120
KTA1015Y/KTA1266,
PNP,
Silicon
2208206105
1
D(Only)
C131
Mylar
01
pF
100V
J
3679104120
1
Q121
DTC114YS
2208622106
1
D(Only)
C132
Electrolytic
SG
0.68
pF
SOV
M
3479368871
1
Q122
MPSAS6Y,
PNP,
Silicon
2208206113.
1
D(Only)
!
C133/C134
Ceramic
Tubular
47
9
50V
J
3519470935
2
Q123
MPSAO6Y
2208606114
1
D(Only)
i
C135
Electrolytic
SG
0.68
yr
SOV
M
3479368871
1
Q124
MPSAQ6Y
2208606114
1
i
C136
Mylar
0.1
yr
100V
J
3679104120
1
Q125
DTIC14YS
2208622106
1
|
C137/C138
Electrolytic
SG
22
pe
SOV
M
3479322971
2
:
C139
Mylar
0.047
yF
100V
J
3679473120
1
Resistors
|
C140/C141
Electrolytic
SG
0.22
ype
SOV
M
3479322871
2
R101/R102
Carbon
Film
220
koh
1/5W
J
3069224970
2
C142
Mylar
0.047
pF
100V
J
3679473120
1
R103-R110
Carbon
Film
1koh
W5W
J
3069102970
8
C143
Mylar
0.015
yr
100V
J
3679153120
1
R111
Carbon
Film
22koh
5W
J
3069223970
1
C144/C145
Electrolytic
SG
0.1
pF
SOV
M
3479310871
2
R112/R113
Carbon
Film
220
koh
1/5W
J
3069224970
2
'
C146
Mylar
0.015
pF
100V
J
3679153120
1
R114/R115
Carbon
Film
3koh
W5W
J
3069302970
2
|
C147
Mylar
0.005
yr
100V
J
3679472120
1
R116-R118
Carbon
Film
220
koh
15W
J
3069224970
3
C148/C149
Mylar
0.047
yr
100V
J
3679473120
2
R119/R120
Carbon
Film
330
koh
1/5W
J
3069334970
2
C150
Mylar
0.005
pF
100V
J
3679472120
1
R121
Carbon
Film
1koh
/5W
J
3069102970
1
C151
Mylar
0.002
pF
100V
J
3679222120
1
R122
Carbon
Film
150
koh
1/5W
J
3069154970
1
€152/C153
Mylar
0.02
pF
100V
3
3679203120
2
R123
Carbon
Film
100
koh
1/5W
J
3069104970
1
C154
Mylar
0.002
pF
100V
J
3679222120
1
R124
Carbon
Film
10koh
15W
J
3069103970
1
|
C155
Ceramic Tubular
820
pw
SOV
K
3519821935
1
R125
Carbon
Film
100
ohm
1/5W
J
3069101970
1
C156
Mylar
0.008
yF
100V
J
3679822120
1
R126
Carbon
Film
10koh
1/5W
J
3069103970
1
|
C157/C158
Ceramic
Tubular
100
9
SOV
K
3519101935
2
R127
Carbon
Film
1koh
WU5W
J
3069102970
1
C159
Mylar
0.008
yr
100V
J
3679822120
1
R128/R129
Carbon
Film
100
koh
1/5W
J
3069104970
2
)
C160
Ceramic
Tubular
820
w
SOV
K
3519821935
1
R129
Carbon
Film
100
ohm
15W
J
3069101970
1
|
C161
Ceramic
Tubular
330
pw
SOV
K
3519331935
1
R130
Carbon
Film
1koh
5W
J
3069102970
1
C162/C163
Mylar
0.003
yr
100V
J
3679332120
2
R131
Carbon
Film
100
ohm
1/5W
J
3069101970
1
C164
Ceramic
Tubular
330
pw
50V
K
3519331935
1
R132/R133
Carbon
Film
100
koh
1/5W
J
3069104970
2
|
C165/C166
Electrolytic
SG
33
yr
=25V
M
3479333041
2
R134/R135
Carbon
Film
100
ohm
1/5W
J
3069101970
2
|
C167/C168
Electrolytic
SG
0.33
pF
SOV
M
3479333871
2
R136/R137
Carbon
Film
100
koh
1/5W
J
3069104970
2
C169
Electrolytic
SA
10
pF
SOV
M
3479210071
1
R138/R139
Carbon
Film
tkoh
15W
J
3069102970
2
C170
Electrolytic
SG
0.1
pF
SOV
M
3479310871
1
R140/R141
Carbon
Film
8.2koh
1/5W
J
3069822970
2
C171/C172
Electrolytic
SA
470
wr
35V
M
3409247169
2
R142
Carbon
Film
100
koh
W5W
J
3069104970
1
C173
Electrolytic
SG
47
pwr
SOV
M
3479347071
1
R143
Carbon
Film
820
keh
1/5W
J
3069824970
1
C174/C175
Mylar
0.022
pF
100V
J
3679223120
2
R144/R145
Carbon
Film
1koh
V5W
J
3069102970
2
C176/C177
Ceramic
Tubular
100
pw
SOV
K
3519101935
2
R146
Carbon
Film
820
koh
1/5W
J
3069824970
1
C178
Ceramic
Tubular
0.1
pe
SOV
Z
3519104935
1
R147
Carbon
Film
100
koh
1/5W
J
3069104970
1
R148
Carbon
Film
1koh
15W
J
3069102970.
1
Connector
R149/R150
Carbon
Film
82koh
5W
J
3069822970
2
CP101
Wafer
15P
4420517410
1
R154
Carbon
Film
1koh
W5W
J
3069102970
1
R152
Carbon
Film
380
ohm
1/5W
J
3069391970
1
Diodes
R153
Carbon
Film
100
koh
1/5W
J
3069104970
1
D101-D103
1N4148M,
Switching
2058322101
3
R154
Carbon
Film
1Skoh
5W
J
3069153970
1
D104/D105
Zener,
UZ
7.5BSC
2258599130
2
R155
Carbon
Film
B20
koh
1/5W
J
3069824970
1
D106
Zener,
UZ
6.2BSB
2258599105
1
R156/R157
Carbon
Film
220
koh
1/5W
J
3069224970
2
D107
Zener,
UZ
15.0BSC
2258599109
1
R158
Carbon
Film
15koh
5W
J
3069153970
1
D108
Zener,
UZ
7.5BSC
2258599130
1
R159
Carbon
Film
820
koh
1/5W
J
3069824970
1
D109
Zener,
UZ
15.0BSC
2258599109
1
R160
Carbon
Film
100
koh
1/5W
J
3069104970
1
D110-D115
1N4002,
Rectifier
2258100135
6
R161
Carbon
Film
390
ohm
15W
J
3069391970
1
D116
1N4148M,
Switching
2058322101
1
R162/R163
Carbon
Film
1koh
15W
J
3069102970
2
R164
Carbon
Film
390
ohm
1/5W
J
3069391970
1
Fuse
R165
Carbon
Film
100
koh
1/5W
J
3069104970
1
15
Ref.
No.
Description
R166
Carbon
Film
15
koh
R167
Carbon
Film
820
koh
R168
Carbon
Film
15
koh
R169
Carbon
Film
820
koh
R170
Carbon
Film
100
koh
R171
Carbon
Film
390
ohm
R172/R173
Carbon
Film
4
koh
R174
Carbon
Film
390
ohm
R175/R176
Carbon
Film
15
koh
R177
Carbon
Film
390
ohm
R178
Carbon
Film
1
koh
R179
Carbon
Film
100
koh
R180/R181
Carbon
Film
820
koh
R182
Carbon
Film
1
koh
R183
Carbon
Film
100
koh
R184
Carbon
Film
390
ohm
R185/R186
Carbon
Film
15
koh
R187
Carbon
Fiim
390
ohm
R188
Carbon
Film
100
koh
R189
Carbon
Film
820
koh
R190
Carbon
Film
418
koh
R191
Carbon
Film
47
koh
R192
Carbon
Film
820
koh
R193
Carbon
Film
100
koh
R194
Carbon
Film
390
ohm
R195
Carbon
Film
1
koh
R196/R197
Carbon
Film
15
koh
R198
Carbon
Film
1
koh
R199
Carbon
Film
390
ohm
R200
Carbon
Film
100
koh
R201/R202
Carbon
Film
820
koh
R203
Carbon
Film
100
koh
R204
Carbon
Film
390
ohm
R205
Carbon
Fitm
1
koh
R206
Carbon
Film
15
koh
R207/R208
Carbon
Film
1
koh
R209
Carbon
Film
15
koh
R210
Carbon
Fitm
1
koh
R211
Carbon
Film
390
ohm
R212
Carbon
Film
100
koh
R213/R214
Carbon
Film
820
koh
R215
Carbon
Film
100
koh
R216
Carbon
Film
390
ohm
R217
Carbon
Film
1
koh
R218/R219
Carbon
Film
15
koh
R220
Carbon
Film
1
koh
R221
Carbon
Film
390
ohm
R222/R223
Carbon
Film
47
koh
R224/R225
Carbon
Film
1.5
koh
R226
Carbon
Film
47
koh
R227
Carbon
Film
220
ohm
R228
Carbon
Film
470
ohm
R229/R230
Metal
Film
15
ohm
R231
Metal
Film
330
ohm
R232
Carbon
Fiim
100
koh
R233/R234
Carbon
Film
3.3
ohm
R235/R236
Carbon
Film
910
ohm
18
19
20
21
22
LUG1
Others
15
W
15
W
1S
W
15
W
15
W
TW
TW
15
W
VW
15
W
115
W
1S
W
115
W
SW
15
W
1S
W
15
W
115
W
11
W
TSW
15
W
115
WW
15
W
TW
TSW
115
W
15
W
155
W
1155
W
TSW
115
W
115
W
115
W
115
W
v5
Ww
15
W
115
W
1155
W
115
W
1155
W
SW
VS
W
115
W
15
W
TSW
15
W
15
WwW
TIS
W
TW
TSW
15W
15
W
iw
iW
TSW
TSW
115
W
Heat
Sink,
Regulator
TR.,
Aluminum
Outlet,
ABS,
Black
Outlet,
ABS,
Black
Outlet,
ABS,
Black
Switch
Selector,
ABS,
Black
Jack
RCA,
2P,
ABS,
Black
Jack
RCA,
4P,
ABS,
Black
Lug
Wire
HI-WRAP
#22,
200mm
Power
Ttransformer,
220
V
60
Hz
[A
SO
SOS
SS
OS
SO
OCR
SO SR
SOO
OO
SS
SO
SO
SO
SO
OO SO
SO
eS
Parts
No.
3069153970
3069824970
3069153970
3069824970
3069104970
3069391970
3069102970
3069391970
3069153970
3069391970
3069102970
3069104970
3069824970
3069102970
3069104970
3069391970
3069153970
3069391970
3069104970
3069824970
3069183970
3069473970
3069824970
3069104970
3069391970
3069102970
3069153970
3069102970
3069391970
3069104970
3069824970
3069104970
3069391970
3069102970
3069153970
3069102970
3069153970
3069102970
3069391970
3069104970
3069824970
3069104970
3069391970
3069102970
3069153970
3069102970
3069391970
3069473970
3069152970
3069473970
3069221970
3069471970
3029150470
3029331472
3069104970
3069339970
3069911970
7505202410
4448105510
4448103210
4448103610
4618006610
4438105010
4438103110
152622102058
2828100187
Q’
NNO
NBABEBKHKHAABANHA
BRAN
BBB
ANB
BB
BAN
BAB
BAN
BAB
Bee
Bw
BAAN
BABA
BNH
BA
HAN
ANH
BA
wH
BB
re
ee
ee
Version
D(Only)
D(Only)
D(Only)
KS
A
Dd
B(PT
INDO)
KS
16
Ref.
No.
Pin
Solder
Terminal
Ground
Clip
Fuse
Description
Ass'y
P.C.Board
Front
Capacitors
C301
Electrolytic
SA
€302/C303
Electrolytic
SG
C304/C305
Mylar
C306/C307
Mylar
C308-C310
Electrolytic
SA
C311/C312
Electrolytic
SG
C313/C314
Ceramic
Tubular
C315/C316
Mylar
C317/C318
Mylar
€319/C320
Mylar
C321-C323
Electrolytic
SA
C324/C325
Electrolytic
SA
C326
Electrolytic
C327
Ceramic
Tubular
C328
Electrolytic
SG
C329
Ceramic
Tubular
Diodes
4.7
uF
0.22
uF
0.1
pF
0.033
pF
47
33
820
0.002
0.006
pF
0.015
yF
10
uF
4.7
uF
0.047
pF
0.01
pF
1
uF
0.1
uF
mE
0301-D303
1N4148M,
Switching
0304/D305
Zener,
UZ
6.2BSB
D306-D314
1N4148M,
Switching
D327-D332
1N4148M,
Switching
LED's
D314
SLR-34YCD-49,
Yellow
0315/0316
SLR-34YCD-49,
Yellow
D317
SLR-34URCF25,
Red
D318
SLR-34YCD-49,
Yellow
D320-D326
SLR-34YCD-49,
Yellow
IC's
{C301
uPD78042,
CPU
1C302
KA324
1C303/304
KIA7SSS9S/KIA4559S,
OP
AMP
Transistors
Q301-Q314
DTC114YS
Q308-Q314
DTC114YS
Resistors
R301
Carbon
Film
20
koh
R302
Carbon
Film
2.2
koh
R303
Carbon
Fitm
20
koh
R304
Carbon
Film
2.2
koh
R305
Carbon
Film
20
koh
R306
Carbon
Film
2.2
koh
R307
Carbon
Film
15
koh
R309-R311
Carbon
Film
62
koh
R312
Carbon
Film
820
koh
R313-R315
Carbon
Film
62
koh
R317
Carbon
Film
100
ohm
R318
Carbon
Film
51
koh
R319
Carbon
Fitm
100
ohm
R320
Carbon
Film
33
koh
R321
Carbon
Film
400
ohm
R322
Carbon
Film
27
koh
R323
Carbon
Film
45
koh
R324-R326
Carbon
Film
20
koh
R327
Carbon
Film
51
koh
R328
Carbon
Film
1.2
koh
R329
Carbon
Film
62
koh
R330
Carbon
Film
2.2
koh
50V
50
V
100
V
100
V
50V
16V
50V
4100
V
100
V
100
V
50
V
50
V
5.5V
50
V
50
V
50
V
WW
SW
VS
W
15
W
15
W
15W
15W
115
W
15
W
VS
W
15
W
V5
W
15
W
15W
VS
W
VS
W
15
W
1S
W
15
W
15
W
VS
W
VS
W
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SB
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Parts
No.
4228001410
4235007310
4255001010
3479247971
3479322871
3679104120
3679333120
3479247971
3479333031
3519821935
3679222120
3679562120
3679153120
3479210071
3479247971
3438247315
3519103935
3479310971
3519104935
2058322101
2258599105
2058322101
2058322101
2384521201
2384521201
2371124701
2384521201
2384521201
2138313224
2168000113
2168206103
2208622106
2208622106
3069203970
3069222970
3069203970
3069222970
3069203970
3069222970
3069153970
3069623970
3069824970
3069623970
3069101970
3069513970
3069101970
3069333970
3069101970
3069273970
3069153970
3069203970
3069513970
3069122970
3069623970
3069222970
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2
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|=
|=
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DN
=
Version
Ref.
No.
Description
Parts
No.
Q'ty
Version
R331
Carbon
Film
62
koh
R332
Carbon
Film
2.2
koh
R333
Carbon
Film
62
koh
R334
Carbon
Film
2.2
koh
R335/R336
Carbon
Film
1
koh
R337
Carbon
Film
20
koh
R338
Carbon
Film
91
koh
R339-R341
Carbon
Film
62
koh
R342
Carbon
Film
100
ohm
R343
Carbon
Film
18
koh
R344
Carbon
Film
100
ohm
R345
Carbon
Fitm
12
koh
R346
Carbon
Film
100
ohm
R347
Carbon
Film
12
koh
R348
Carbon
Film
100
ohm
R349
Carbon
Film
27
koh
R350
Carbon
Film
1
koh
R351
Carbon
Film
10
koh
R352/R353
Carbon
Film
100
koh
R354-R358
Carbon
Film
1
koh
R359-R361
Carbon
Film
10
koh
Switches
SWw301
Switch
Tact,
Car/Rock
Sw302
Switch
Tact,
Visval
HP.ST
SW303
Switch
Tact,
Clear
Movie
SW304
Switch
Tact,
Vocal
Pops
Sw305
Switch
Tact,
Soft
Jazz
SW306
Switch
Tact,
Heavy/Classic
$W307
Switch
Tact,
Memory
SW308
Switch
Tact,
EQ
Defeat
SW309
Switch
Tact,
Display
Level
SW310
Switch
Tact,
Display
Mode
Sw311
Switch
Tact,
Shift
SW312
Switch
Tact,
Tape
Monitor
SWw313
Switch
Tact,
Power
155
W
155
W
15
W
115
W
15
W
15
W
115
W
15
W
TW
115
W
155
W
155
W
15
W
115
W
15
W
15
W
15
W
15
W
15
W
SW
TW
PRODUCT
SAFETY
NOTICE
eoenuonuweceuweeoeoeeoeeQgnoeuoagnna
3069623970
3069222970
3069623970
3069222970
3069102970
3069203970
3069913970
3069623970
3069101970
3069183970
3069101970
3069123970
3069101970
3069123970
3069101970
3069273970
3069102970
3069103970
3069104970
3069102970
3069103970
4658003710
4658003710
4658003710
4658003710
4658003710
4658003710
4658003710
4658003710
4658003710
4658003710
4658003710
4658003710
4658003710
OON
A
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een
nnn
an
waaay
waa
wn
Bee
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nin
Ref.
No.
X301
FL101
CN102
SW314
SW315
SW316
SWw317
Description
Resonator
CST4.19MGW-TFO1
Fluoresent
FIP1SAW16Y,
FL
Display
Ass’y
P.C.Board
Front-1
Connector
Lead
Ass'y
15P,
160mm
Switches
Switch
Tact,
a,
Level
Up
Switch
Tact,
<¢,
Frequancy
"L”
Switch
Tact,
yw,
Level
Down
Switch
Tact,
»
,
Frequancy
"R”
Parts
No.
3938124006
2328130927
436215163132
4658003710
4658003710
4658003710
4658003710
Each
precaution
in
this
manual
should
be
follower
during
servicing.
Components
identified
with
the
IEC
symbol
{\
in
the
parts
list
and
the
safety
can
be
of
special
significance.
When
replacing
a
component
identified
with
4\,
use
only
the
replacement
parts
designated,
or
parts
with
the
same
ratings
of
resistance,
wattage
or
voltage
that
are
designated
in
the
parts
list
in
this
manual.
Leakage
current
or
resistance
measurements
must
be
made
to
determine
that
exposed
parts
are
acceptably
insuiated
from
the
supply
circuit
before
retuning
the
product
to
the
customer.
a’
=a
2
oo
Version
17
sce
woneseson
anism
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AOoN
Sa
na
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totals
at
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thon
NE
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abn
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|
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|
|
IC'S
LEAD
IDENTIFICATION
&
INTERNAL
DIAGRAM
KA7818
:
1C105
OUTPUT
KA324
:
IC302
(NPUT
CURRENT
LIMITER
&
PROTECTOR
THERMAL
SHUT
DOWN
START-UP
CIRCUIT
ac
v=A=CcoO
GND
LC7522
:
1C102
LC7522
LC7821
:
1C1011
Resistor
Network
Analg
SW
IN2
0
OIN1
=
Shift
Register
Vopo
Vss
VEE
Vee
Resistor
Network
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SW
L1
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2
a
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33
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26
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DESCRIPTION
KTA1266(1015)
KTC3198(1815)
2SD1302S
DTC114YS
DTA114YS
MPSA06
MPSA56
TRANSISTORS
LEAD
IDENTIFICATION
ECB
EBC
TERMINAL
NAME
B—BASE
C—COLLECTOR
E-EMITTER
20
FRONT
VIEW
BOTTOM
VIEW
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Model
No.:
EQ-3050C
=
LJ
,
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220V_60HZ
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TRANS/FUSE
VALUE
MA
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A400
1500200
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otherwise
followed
indicated
tor
safety.
e
are
one
descrabea
x
unless
a
to
be
M=1-00G.
000
[p=micro-microfaraces!
otherwise
specified
values
microfarades
specified
CAUTION
values
onms
unless
{ke1.
000
2.
Capacitor
are
critical
parts
alsance
tnose
parts
markea
with
use
only
tne
parts
list
1.
Aesistor
Safety
precaution
gurang
servicang
NId
430
10S
AQG2/YWOOCEN
@vTePNt
SB200mA/250
leakage
the
or
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measurements
to
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>]
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set
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