Sherwood Newcastle R-325 User manual

SERVICE MANUAL
R-325/R-325RDS
AUDIO/VIDEO
PRO-LOGIC
RECEIVER
= CONTENTS «
SAFETY
PRECAUTIONS.
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2
MECHANICAL
PARTS
LIST
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22
SPECIFICATIONS
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CIRCUIT
DESCRIPTION
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IC
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ALIGNMENT
PROCEDURES
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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.
.
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
uF
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
{)
resistor
and
a
0.15
uF
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.
AC Outlet
At 5000 Q per volt or greater sensitivity ,
the reading should not exceed 0.75 V.
0.15 2F 150V AC
Place
the
probe
on
each
exposed
metalic
part.
AC Voltmeter
Good earth ground, such as
a water pipe or conduit.

SPECIFICATIONS
a FRONT AMP SECTION
Measuring methods are based on IHF and IEC standard 268-3.
Measurements conditions, unless otherwise noted:
* Output resistive load: 8 ohms/Both channel driven.
» Tone (Bass, Treble), Balance: Center Position, Other SW's: OFF.
* Nominal input level: 5 mV for MM, 0.5 mV for MC, 500 mV for general purpose inputs.
» Power figures should be kept minimum 10 min. between 15 and 35 ‘c.
* Terminator: 100 ohms for MC, 1 kohms for MM and general purpose inputs.
« Filter: IHF-A filter * R/O: Rated Output
input Sen P AUX. | tkHz | - | mv [230 |
a
2 Sramnel ales ag ee a oe
(voto -40. de] __dB__| +6 | +4 |
3 [ResidualNowe | AUX | tkHz_| VOL-mn. | mv] 1 | 08
4 |Total Harmonic Distortion AUX | 20Hz | 60W1IW] % | 02 | 0.09 |
sowiw] % | 02 | 0.09 |
20kHz | 6OW/IW] % | 0.2 | 0.09 |
Pea Average Power | AUX |_20Hz | 8ohms | W | 55 | 60 _|
at
0.2%
THD
|
ikHz
{|
8ohms
|
WwW
|
55
[60
|
20kHz
|
8ohms
|
Wi
|
55
|
60
|
inter Modulation Distortion 60Hz=4} RIO | % | 0.2 | 0.09]
SMPTE 7kHz=1[ 1W fT % | 02 0.09 |
ia ice to Noise Ratio | AUX | ikHz | RO | dB [| 90 | 93 |
[wim —[TkHz | R/O | dB | 70 | 74_|
Channel Separation AUX | 100Hz | RO-3a8 | cB | 50 | 55
noe shorted. [tkHz | Ri0-3dB | dB_| 50 | 55
[f0kHz | R/O-3dB | dB_| 45 | 50 |
9 [Function Crosstalk | CD-»AUX| 1/10kHz| RIO-30B | aB | 70/65 | 75/70 _|
[10 (Frequency Response | AUX | - TW Hz~kHz[ 20/50 | 10/70 |
11]Tone Control, +10 dB AUX | 100Hz | 1W_ | oB +10+2 | +10+1)
| 10kHz | iW | dB] + 10+2 | +10+1'
12 [Phono Equalization PHONO | 100Hz | TAPEOUT| dB | RIAA+2 | RIAA+1|
ra | 10 kHz | TAPEOUT| dB [ RIAA+2 | RIAA+1]
[13 [Input Overload at 0.5% THD | MM _ | 1kHz | TAPEOUT[] mv [ 140 | 145 |
«- REAR AMP SECTION
Measurements conditions: Input level 350 mV, Delay time 20 mS, Rear level max., Master volume adj,
Only Rear Channel drive.
[1 [Power Output t 0.7% THD
[2 [Total Harmonic Distortion | AUX | 1kHz | iW | % | 4.0 [0.7
3 |Signal to Noise Ratio
AUX 1W
(IHF-A Filter) DOLBY
THEATER
SAUX
aw
eB
ee
HALL
Sa
a
a
SIMULATED
|
AUX
|
=
{|
ww
|
dB
60S
4 |Frequency Response AUX 1 kHz W Hz~kHz | 100~6 80~7
at +3 dB (ONLY DOLBY)

a> CENTER AMP SECTION
Measurements
conditions:
Input
level
350
mV,
WIDE
mode,
Center
level
max.,
Master
volume
adj,
Only
Rear
Channel
drive.
Power Output at 0.3% THD
,
P50
|
70
-2
[Total
Harmonic
Distortion
|
AUX
|
1kHz
|
1W
|
%
|
03
|
0.09
|
Signal
to
Noise
Ratio,
HF-A|
AUX
[|
-
|
1w
|
@B
|
70
|
78
_
DOLBY
MODE
NORMAL
AUX
1W
Hz
~
kHz
wine
[AUX
[|
-
|
1W_|
Hz~kHz|
50-60
|
20-60
|
ar VIDEO SECTION
ING
Output
Level
at
75
ohms
VCR1
(1Vp-p
Pt MHz |_| :
"2
[Frequency
Response
|
VOR‘
(vp-p)|_1MHz
|
-|Hz—MAz|
DC~6
|
DC-63
3
[Signalto
Noise
Ratio
[vert
(vep|
1MHz|_-
|
oB
|
45
|
50
|
ra
[orosstak
——SSC~dVR
em]
TMH2
|
-
|
a8
|
45
|
50
«ar AM SECTION
Measuring
methods
in
conformity
with
IEC
standard
315.
Measurements
conditions;
»
Radio
frequency:
1000/999
kHz,
Audio
frequency:
400
Hz
+ Reference level: 5 mV/m, 10 mV/m on 50 ohms, Modulation: 30%
*
Test
point:
TP1=600
kHz,
TP2=1000
kHz,
TP3=1400
kHz
(USA/Canada
Version)
»
Test
point:
TP1=594
kHz,
TP2=999
=1404
kH
Versi
1
|Tuning
Cover
Range
LOW~
HIGH
USA/Canada
z
520~1710
Europe/Korea]
kHz
522
~1611
Step
AUTO/Man.
USA/Canada
kHz
10/10
Europe/Korea
kHz
9/9
Usable
Sensitivity
uV/m
<
800
<500
S/N=20
dB
TP2
uV/m
<800
<500
TP3
uV/m
<800
<500
3
[Signal
to
Noise
Ratio
ae
Total
Harmonic
Distortion
<
16)
ofofafo] | 1S
8 | :
are ek al
Over
Load
Distortion
at
5
mV
input,
6O%MOD._|——+|
—%
|
<0
|
<5
Frequency
Responseat6dB
SCE
SSSC*YSC
:
ry
|Selectivity_____T0KHafokHz
[|
_—~+(|
«B
[
320
|
>25
|
Pa
[AGC
Figure
ofMent
—100mVat-10dB
|_|
oe
|
=50
|
355
_|
Fa
|Whistie
Modulation
attmvim
eT
SST
|
sts
|
10
Holimage
Rejection
tes
SSSSC~dPSCSSCSCSC~dS
(C0
|
ia
[Auto
Stop
Level
———SCSCSSSCSCSCSCSCSSSSS~*dCn
im
[
B0|
B00H
SB

a FM SECTION
Measuring methods in conformity with IEC standard 315.
Measurements conditions FM;
* Radio frequency: 98.1 MHz, Audio frequency: 1 kHz * Reference level: 1 mV on 75 ohms
* Deviation: MONO=+75 kHz, Stereo=+67.5 kHz+7.5 kHz (Korea/USA/Canada Version)
x Deviation: MONO=+ 40 kHz, Stereo= +40 kHz+7.5 kHz (Europe Version)
x Test point: TP1=90.1 MHz, TP2=98.1 MHz, TP3=106.1 MHz (Korea/USA/Canada Version)
x Test point: TP1=90 MHz, TP2 pe Version
87.5~ 108
200/200
100/50
Korea/USA/Canadal Bf <17.2 <14.2
dBf <17.2 <14.2
dBf <17.2 <= 14.2
Europe dBf 20.2 <17.2
dBf 20.2 <17.2
dBf $20.2 17.2
Step AUTO/Man.
2 |Usable Sensitivity
S/N=30 dB
3 |Full Limiting Sense Output= -3 dB | Korea/USA/Canada dBf < 15.2 <12.2
Europe $20.2 <17.2
|_4
|Auto
Stop
Level
Pts:
BE]
31.2(5)
[31.2123]
Signal to Noise Ratio MONO Korea/USA/Canada dB >65
Europe dB >62
STEREO Korea/USA/Canada dB >60
dB
Total Harmonic Distortion MONO %
STEREO %
7 |50 dB Quieting Sensitivity Korea/USA/Canada dBf
dBf
46 dB Quieting Sensitivity Europe dBf
dBf < 48. < 45.3
Frequency Response at +1.5 dB | téi‘(tSsé*dYCOhKHKz =| 20/12.5 | 10/74
Channel Separation Korea/USA/Canada dB
Europe dB
Korea/USA/Canada
Europe
Korea/USA/Canada
Europe
dB
dB
dB
dB
10/|Spurious Response Korea/USA/Canada dB
ee
ee
eee
i
Image Rejection TP3 Korea/USA/Canada dB
dB
| dB
270 280
270 =80
247 252
$2.5 S2
nN
AM
Rejection
ratio
Korea/USA/Canada
Europe
Capture ratio ace
Output Level MONO i cAn te oY
AS
15
ak ‘at =
W

GENERAL
Power
CONSUMPtiON
--------------------
nnn
nnn
nnn
A:
2.3A,
D:
550W,
K:
450W
Power
Supplies
------------------n--—-
nanan
nnn
nnn
nnn
A:
AC
120v,
50Hz
(USA/Canada
Version)
D: AC 230V, 50Hz
(Europe Version)
K: AC 220V, 60Hz
(Korea Version)
Dimensions
(W
xX
H
x
D)------------------n
nn
nnn
nnn
nnn
nnn
nnn
nnn
nnn
nnn
440
x
125
x
300mm
17-5/16
x
4-15/16
x
11.8inchs
Weight
(Net)
-—---=----—-==---—
aaa
ea
ncn
ennn
nena
cece
nce
ncncencnnenannmnnnen
10.5kg

BLOCK DIAGRAM
Model No. : R325/R325RDS
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FM
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INPUT PARTS
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PARTS
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TUNER
PARTS
AC
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MAIN
AMP
PARTS
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PARTS
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REAR
AMP.
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A: 2828101111
D: 2828101121
K: 2828101511
4001005170
(ONLY_D}
CP1i01
PCB6 (PWR
SW)|| PCB6 (ST/BY)
CN704
PCB11 (SPKR SW)
WIRING DIAGRAM
PCB3 (SPKR)
\_/ PCB2 (MAIN)
(ONLY D) cP7o04
@ | 2P |ensoi [BP |
CcP102
CP106
3°
CP104 CP302
QO.
=
PCB5 (FRONT)
B’D TO B’D
PCB7 (SURR)
10
Model No. : R325/R325RDS
PCB12 (DIGILINK)
PCB8 (INPUT)
BD: TO BD
PCBS (VOLUME)
10P
PCB1 (TUNER)
ie)
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CIRCUIT DESCRIPTION
1C301 : LPD 78043AGF-209 -3B9
1. Pin Description
G6
G7
G8
FIP Grip &9
G10
G11
G12 0
Vdd
CLOCK
: DATA
e MODE
/ MAIN MUTE
1102,9702CE
9273CE
SIMULATED LED
RLY
RESET
RDS OPTION
PROTECT
AVSS
RDS DATA
wf ENC UP
STEREO
AMP OPTION
OG3 GRID O G5 O G4
O G2 OG!
80 79 78 77 76 75 74 73 72 71 70 69 68 67 66 6564
63
62
61
60
59
58
57
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
omWn Omer WN =
41
31 32 33 34 35 36 37 38 39 40
27 28 29 30
Ugehesoog | fuume
wetassess PEEY®
D2>x3atE5,2206 4o D222
Sos =% gf 222
co é x FED
rEFoDzZ
= 205
fe) Wi e
o oO
11
;
SEGMENT
O $11
O $12
O $13
© $14
© $15
© S16
© STBY-LED
VOL-LED
VOL-UP
VOL-DN
$2 (VCR1)
$3 (VCR2)
Vdd
7001 CLOCK
7001 DATA
© 7001 CE
© Vss
© ENC DOWN
© RDS CLOCK
© POWER DOWN
© RMC
Oo K1——
© K2
© K3
KEY IN

2. Input & Output Terminal Functions
[PinNo.| Symbol __| Description —————SS—SCS~—SCSCSCSCSCSCSS
[8 | Vid | +8V power supp. SSS
[2 _| CLK] Output clock signal to TC0273, NIWITO2 and NJUSTOZ. SCS
[77 [- move | Output, control output for ByPass Mode and surr Mode.
12 MAIN Output for main mute.
MUTE Output is low level under the following conditions.
1. When power is turned on or off.
2. When function is changed.
3. When MONO or STEREO is changed.
4, When Low level is inputed to PROTECT port of CPU.
5. When mute signal is received from the commander.
Each
time
the
simulated
button
is
pressed,
the.
"SIMULATED
LED"
light
on
or
off.
Output for driving Power Relay (Active High)
Input for resetting CPU. (Active High)
Control output for RDS mode. (This output is used only for R325RDS)
19 PROTECT Signal input for protection.
When
low
Level
is
inputed,
it
is
changed
to
STAND
BY
mode.
This pin provides the ground potential.
RDS data input of TDA7330BD. (This input is used only for R325RDS)
Input for Encoder Volume up and down.
(CW) (CCW)
0 AVss
21 RDS DATA
22/47 | ENC UP/DOWN
23
24
25
STEREO Input for lighting the "STEREO" indicator. (Active Low)
AMP OPTION input for selecting AV 5060.
POWER
MUTE
|
When
the
power
is
on,
control
data
output
is
High
after
3
seconds.
When the power is off, control data output is "L".
Input/Output for controlling digi-link {||.
Input signal level of Tuner.
D-LINK
S-METER
No 6
27
12