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  9. Sherwood EQ-3050C User manual

Sherwood EQ-3050C User manual

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SERVICE
MANUAL
EQ-3050C
STEREO
GRAPHIC
EQUALIZER
reuse
mt
GRAPHIC
EQUALIZER
EQ-3050C
a
CONTENTS
#
Safety
PreCAUtiONS
ceererserrerececeeteteeereetereeeeeees
2
Exploded
AV
AT-\\,
|
eee
11
Specifications
a
aren
fo:
draictaiiecatatesoVeinie'ayare
score
ore
ie
ela
Sie
weleateniniwisteiea
3
Printed
Circuit
Boards
--cesescceeeesseesceeeer
cen
eeeene
13
Block
Diagram
sprain
a
qniainltn
ade
ccaie
aig
ea
eraceeenennns
nw
BER
NOER
4
Electrical
Parts
List
-:::::--seceseeree
tsetse
cee
eersereenees
15
Wiring
Diagram:
ssrrrrsresreere
rte
tte
ee
ceee
seen
esos
eeee
es
5
IC'S
Lead
Identification
&
Internal
Diagram
---18
Circuit
Description
o's
sine
eieiniaiee
aia
e
nleleigiwieiweeieae
sine
naeiseeae
6
Transistors
Lead
Identification
--:---+++-sessee
eee
20
Mechanica!
Parts
List
-ccccecercceseeece
seers
eeteeeees
10
Schematic
Diagram
aa
avaara
le
averevavalss
ayers
iaveraern
wie’s"slaistanesere's
21
G
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.
tS
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
<-+-eeeeseeesteseeeseeeetee
test
eet
tetaeetaetaeteseeeeeeneees
ee
eeeee
seer
eee
e
esas
teen
tee
gene
eee
ees
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.
escunnstan
oniens
arsine
saersaenaiese
thie
mato
BLOCK
DIAGRAM
TAPE
MONITOR
ON:
TAPE
SIGNAL
OFF
:LINE
SIGNAL
BUFFER
TAPE
INQ)
Ic103
KIA75559S
€Q
OEFEAT
ON:
BYPASS
OFF
:EG
INPUT
SELECTOR
IC104
een
Lc7e241
sat
DIGI-~LINKO
KIA7S559S
COMPERATOR
1c302
Ic303
Ic304
Model
No.:
EQ-3050C
Lco7522
POWER
SUPPLY
KEY
|
MATRIX
LED
ON/OFF
WIRING
DIAGRAM
Model
No.:
EQ-3050C
ry
aa
UC)
CECE
Ea
|
ODOCOOOOOOOCOOO
CN101
__onio3
LOO
|
Lt)
PRONE
“a.
1C301
:
uPD
78042
1.
Pin
Configuration
CIRCUIT
DESCRIPTION
ae
ee
ee
ee
annie
|
a
pa)
SS
h
to)
iii
(
)
\
ne
‘
VLOAD
—Oo1
k
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
ie)
Oo
o
N
38
|)
e
mene
d
t+)
¢
It)
b
ee
+)
a
:
jC)
-
Key
OUTPUT
coment,
=e
=)
+———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
HE
MOE
EE
A
IES
NEN
SET
EAE
CT
DO
ON
RT
2.
Block
Diagram
OvOT,
O
waarua
‘IOULNOD
/SITIOULNOD
K
LdNuugLNt
etdid-Odia
<_|
did
A@
GNVIS
|
yoLNGNID
YOOTO
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ovine
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1149
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anos
|
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>
HALL
SOGHOLYM
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>
‘Dau
TWuaNaID
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>
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KD
CNY
tune
aka
ABH
98
Ca
WALNNOD
LNGAT
AGL
1491
Cod
€0d/0ID/Ed
LNI-
00d/OLL/Od
INI
L1d/LINY-
Old/OINY
v7d/ASNG
€td/A1S
ted/1XOS
1%4/1OS
0@d/US
tt4/0XD8
97d/18S/00S
Std/0aS/OIS
£0d/EdLNI/OID
bEd/ZIL
c€d/ZOL
C€d/ULL
led/TOL
j—O
00d/0d.
LNI/OLL
O€d/0OL
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
Q'
=
aa
a
aa
a~aeananaenweoaaneeen
en
enon
nnnnNAB
eer
ew
eaeseaw
ene
swansea
ans
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