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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11
IC
FUNCTIONAL
BLOCK
DIAGRAM
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37
ALIGNMENT
PROCEDURES
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SCHEMATIC
DIAGRAMS
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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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MONO
MUTE
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FM
MPX
DATA
CONTROL
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120V/60Hz
FM
|
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USA:
MPX.
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EUROPE
:230V/50Hz
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SURAOUND
PARTS
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TUNER
PARTS
AC
OUTLET
MAIN
AMP
PARTS
POWER
SUPPLY
PARTS
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pont
AMP
REAR
AMP.
Lapse
‘ide
(SAME
AS
LEFT
CHANNEL
]}
see
PHONO
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FRONT
TV/AUX
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TONE
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Zz
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DELAY
REAR
NJUS702
140B
14¢0B
SPK,
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REAR PRE-OUT

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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

According
to
region,
input
for
selecting
the
frequency
bands
and
steps
for
FM
and
AM
Settings are as follows
/ REGION : FREQUENCY BAND | STEP | PIN21(IC301)|
' USA/ | FM: 87.5~107.9 MHz| 200 kHz
CANADA | AM: 520~1710 kHz | 10 kHz | 5V
| EUROPE | FM: 87.5~108 MHz | 50 kHz |
| AM: 522~1611 kHz | 9 kHz 2.5V
| KOREA | FM: 87.5~107.9 MHz| 200 kHz |
AM: 522 ~ 1611 kHz
a ss
a
ST
A
Seo
aE
Input/Output
for
crystal
oscillator.
Output for center mute.
Output is low level under the following conditions.
1. When power is turned on or off.
2. When center mode is on or off.
3. When center mode is switched.
4.
When
test
tone
mode
is
on
or
off,
When
the
channels
is
changed
to
the
test
tone
mode.
5.
When
Low
level
is
inputed
to
"PROTECTION"
of
CPU.
6. When mute signal is received from the commander.
Output for surround mute.
Output is low level under the following conditions.
1. When power is turned on or off.
2. When surround mode is on or off.
3.
When
test
tone
mode
is
on
or
off,
When
the
channels
is
changed
the
test
tone
mode.
4. When delay time is changed.
5.
When
Low
level
is
inputed
to
"PROTECTION"
of
CPU.
6. When mute signal is received from the commander.
37 SURR.
MUTE
13

5. When displayed preset number is changed during memory scan.
[Pin No.| Symbol
6. When Low level is inputed to "PROTECTION" of CPU.
38 TUNER Output for tuner mute.
MUTE
7. When mute signal is received from the commander.
Output is high level under the following conditions.
1. When power is turned on or off.
2. When tuner band is changed.
3. When tuning up or down button is pressed.
RDS CLOCK
4. When preset button is pressed.
Vss
7001 CE Chip enable output for LM7001.
52
50/51 | 7001 CLK/DATA} CLOCK/DATA signal output for LM7001
| 52 | Vdd +5V power supply.
53/54 $3/S2 Output to select the video signal VCR1 or VCR2.
$3. | REMARKS |
|
__vcR1 | LH __ Initial settings |
| vCR2; H ; L | |
‘OTHERS; A | A _ | A: Previous state |
* Last memory function is available
VOL-DOWN/UP | Output data for volume control.
VOLLED
58_| _STBY-LED
59160 | SEG 16/16
61~68[ _SECTA~7
77 [__Vioad
69~7 SEG6 ~ 1 Segment signal output for FIP.
76~8 GRID1~5 Grid signal output for FIP.
55/56
57
oO
BE
14

3. Block Diagram
ee
ed
a oe
——
Toura2 ©
TI2P34 O—|
4. Key Matrix
KEY IN1
PIN 43
KEY INS
PIN 44
KEY IN4
PIN 40
KEY IN5
PIN 39
KSCAN1
PIN 61
DISPLAY
SW333
SEARCH
SW332
SLEEP
(STBY)
SW336
PROGRAM COUNTER)
alt
ROM
PROGRAM MEMORY,
eZee potas
@ ®
KSCAN2 | KSCANS3
FM MODE |CEN MODE
SW327 SW324
MEMORY
SW328
CENTER
A
SW323
Prologic
SW315
CLOCK
BUZZER CLOCK
OUTPUT
eee, pee
KSCAN4 | KSCAN5 | KSCANG6
PIN 64
REAR
Vv
SW320
TUNE
A
SW312
REAR
SWws321
CENTER
V
SWw322
15
sane
Pee Tm
eneraLres. K—)
Krone Ke pores @-@O
KO} vor Ki rrer @-O
Ky vorre Krome @-O
Krome Kroner @-@
Ky vorty Kroon ©-@O@
Lom Feo OO
=x =» eoee
> Pr00-P 107-2) 00) 9)
PORTO
FIPO-FIP33
O-O0-80-8
O Vine)
KSCAN7
PIN 67
SIMULATED] 3-STEREO
SW319 SW316
THEATER
SW317

ALIGNMENT PROCEDURES
TUNER
1. Equipment Required
« AM Standard Signal Generator (AM SSG) + Audio Generator
* Oscilloscope ¢ Distortion Meter
« AC Voltmeter « DC Voltmeter
- FM Standard Signal Generator (FM SSG) « Frequency Counter
« Stereo Modulator
Note : Disconnect external FM antenna prior to alignment.
2. Alignment
2-1, Alignment and Test Point
2-2. AM Alignment
- Output of signal generator should not be greater than necessary to obtain an optimum output reading.
- Signal generator modulation : 30 %
- RF signal frequency : 400 Hz
- Switch : Press the BAND button to AM
Signal Set Equipment Adjustment
Step | Subject Generator Frequency Gapiadion Point Adjust for
Frequenc Setting :
=e (522kHz) oe to J22 (TP1) AM OSC(R
600kHz 600kHz AC voltmeter and
(1404kHz) (1404kHz) of L or R channel
* Feed signal should be fed to loop antenna through the test loop antenna 60 cm distant from
the appliance.
* Repeat the step 1) and 2) until no further improvement occurs.
16

3°
OIF
1000kHz
1000kHz
Ac
voltmeter
and
T3
Maximize
(999kHz)
(999kHz)
oscilloscope
to
speaker
|AMIFT
{audio
output
terminal
of
L
or
R
channel
4
|Tuned
1000kHz
(999kHz)
4
1000kHz
VR1
"Tuned"
flag
in
Level
800
W/m
(999kHz)
the
FL
display
ie
ie
light
on
3-3. FM Alignment
*
Output
of
signal
generator
should
not
be
greater
than
necessary
to
obtain
an
optimum
output
reading.
*
Signal
generator
deviation
:
USA/Canada/Korea
:
75kHz.
Europe
:
40kHz
* RF signal frequency : 1 kHz
-_Switch : Press the BAND button to FM and the FM MODE button to MONO
i
Signal
Set
Equipment
Adjustment
:
Step
|
Subject
Generator
Frequency
Gonnection
Point
Adjust
for
E
Frequenc
Setting
1
{Tuning
98.1MHz
98.1MHz
DC
Volt
meter
T4
Zero
reading
on
a
a
ce
2
|THD
98.1MHz
98.1MHz
Distortion
meter
to
T5
Minimize
(98MHz)
(98MHz)
TAPE
OUT
jack
_—
distortion
of Lor R channel
3
|Tuned
98.1MHz
(98MHz)
|
98.1MHz
VR2
“Tuned”
flag
in
Level
SSG
output
level:
|
(98MHz)
er
aa
the
FL
display
10
W/m
light
on
3-4. MPX Alignment
- Signal generator frequency : 98 MHz
Signal
generator
deviation
:
USA:
75kHz.
Europe
:
40kHz
- RF signal frequency : 1 kHz
* Signal generator output level : 1000 W/m
*
Connect
signal
generator
to
FM
antenna
terminal
through
FM
dummy
antenna
(76
Q)
+_
Switch
:
Press
the
BAND
button
to
FM
and
the
FM
MODE
button
to
STEREO
?
19
kHz
Signal
Equipment
Adjustment
;
tep
|
Subject
Modulation
Generator
Cantiectinn
Point
Adjust
for
Level
Setting
Pilot
on
AC
voltmeter
to
VR3
Set
AC
voltmeter
speaker
terminal
to
0
dB
of
R
channel
AC
voitmeter
to
AC
voltmeter
speaker
terminal
reading
should
be
of
L
channel
at
least
40
dB
below
Pilot
on
AC
voltmeter
to
VR3
Set
AC
voltmeter
speaker
terminal
to
0
dB
of
L
channel
AC
voltmeter
to
AC
voltmeter
speaker
terminal
reading
should
be
of
R
channel
at
least
40
dB
below
If
you
could
not
obtain
-40
dB
readings
in
steps
1
and
2,
readjust
VR3
until
you
obtain
-40
dB
readings.
Nominal
is
-45
dB.
(Europe:
Nominal
-42
dB,
Limit
-37
dB)
17

4. Equipment Connection
4-1. AM Alignment Connection
20" (60 cm)
| TAPE OUT
JACK
Tuner
Front-End
(FE1)
Loop
Antenna
*
RDS
VERSION
:
IC2
4-2. FM Dummy Antenna
125 Q (112.5 02)
Zin
=75Q2
©)
-
Zout
=
3002
150 22
FM Dummy Antenna to 30082 Antenna terminal of system.
4-3.
FM
RF/IF
and
MPX
Alignment
Connection
*pc
Voltmeter
So eS Ls TAPE OUT
) JACK
FM Antenna
Terminal (300Q)
Tuner
Front-End
FM Dummy
Antenna
75Q
AC
Voltmeter
Stereo
Modulator
Distortion
Meter
18

TROUBLESHOOTING
Symptom
Receiver inoperative.
(FL indicator does not light.)
Fuse blows when power is turned on.
Power indicator lights but no sound
from both channels.
One channel does not work when
volume is at maximum with a test
signal applied to the center terminal
of volume control of the dead channel.
Speaker works normally but
headphones inoperative.
FM inoperative
ni
Cause and Remedy
A) Faulty AC power cord.
Repiace.
B) Defectve power switch.
Replace.
C) Broken wire in the power transformer.
Replace the power transformer.
D) Blown fuse.
Replace the fuse.
A) Defective power transformer.
Replace.
B) Short on the primary or secondary of the transformer
circuitry.
Repair the short.
C) Damaged rectifier D118 or damaged transistor
Q210 L/R/C/S Q211 L/R/C/S.
Replace the defective component(s).
D) Short circuit in the amplifier circuit.
Replace the shorted component(s) in the amplifier circuit.
A) Defect in transistor Q210 L/R, Q211 L/R or Q205 L/R
on the Amp Board.
Replace the defective component(s).
A) Defect in transistors Q210 L/R or Q205 L/R on the
Main Amp Board.
Replace the defect.
B) Break in copper foil of printed circuit board.
Repair the defect.
C) Short in speaker output terminal.
Repair or replace.
A) Defective headphone plug.
Replace the piug.
B) Defective resistor R735L/R.
Replace.
A) Defective front-end (FE).
Replace.
B) Defective FM switch.
Replace the switch.
C) Defective transistor Q3 and ICS (IC2,IC3).
Replace the defective transistor or IC(s).
D) Defective coil T4,T5.
Replace the coil(s).
E) Defective lead-in.
Repair or replace the lead-in.
F) Ceramic filters CFI,CF3 defective.
Replace the defective ceramic filter(s).
19

Cause and Remedy
A) Improper adjustment.
Readjust VR3.
(Refer to MPX Alignment.)
B) IC3 defective.
Replace.
C) Variable resistor VR3 defective.
Replace the variable resistor.
Poor multiplex separation.
STEREO indicator does not light. A) Defective indicator in FL.
Replace.
B) Improper adjustment of VR2 of tuner board.
Make readjustment.
C) Defective iC2.
Replace the defective component.
FM volume is insufficient. A) lf volume from both L and R channels is not loud
enough :
Front end section defective.
Faulty IC2, Coil T4 or T5.
If sound of one channel is not loud enough:
Defective VR3.
FM Mono has no effect. A) Defective FM MODE switch.
Replace.
AM inoperative. A) Damaged !C2 of tuner board.
Replace.
B) Defective T1,T2,T3 or CF4 of Tuner Board.
Replace the defective component(s).
C) Defective AM switch.
Replace.
D) Defective varicap diodes VD1 or VD2.
Replace varicap diods(s).
| E) Damaged AM loop antenna.
Repair or replace.
{ 1
Bass control has no effect A) Variable resistor BASS defective.
Replace.
20

Symptom
Treble control has no effect.
Auto tune inoperative. (UP/DOWN)
Cause and Remedy
A) Variable resistor TREBLE defective.
Replace.
A) Poor contact in Up/Down key.
Repair or replace.
B) Defective 1C301.
Replace.
C) Defective tuner circuit components.
Replace.
D) In case of FM only, improper adjustment of FM
front-end.
Readjust.
Manual tune inoperative. (UP/DOWN)
(AM or FM)
Memory setting inoperative.
FL inoperative.
i a ee ee
A) Poor contact in Up/Down key.
Replace.
B) Defective IC301.
Replace.
A) Poor contact in memory keys 1-10.
Replace.
B) Defective 1C301.
Replace the defective component.
A) FL defective.
Replace.
B) Defective IC301.
Replace
C) Defective D113 and D114.
Replace.
| eee uno
Noisy volume control.
Remote Control Unit inoperative.
A) Defective volume.
Replace.
A) Weak battery.
Replace.
B) Defective.
Replace.
C) Defective Remote sensor.
Replace.
21

REF.NO. DESCRIPTION
(39)
(39)
40
41
42
43
45
46
47
48
49
50
51
(51)
52
(52)
(52)
(82)
53
55
(85)
(85)
57
58
PACKAGE
BOX CARTON
BOX CARTON
POLY BAG
FILM SOFT PE
CUSHION POLY
ACCESSORIES
ANTENNA AM LOOP STAND-TYPE
ANTENNA WIRE FM
MATCHING TRANS
MATCHING TRANS
COMMANDER ASS"Y
COMMANDER ASS*Y
BATTERY 1.5V AA(REM)
MANUAL INSTRUCTION
MANUAL INSTRUCTION
MANUAL INSTRUCTION
MANUAL INSTRUCTION
CABINET & CHASSIS
PANEL FRONT
PANEL FRONT
PANEL FRONT
BADGE,SHERWOOD
WINDOW FL,
WINDOW FL,
WINDOW FL,
DECORATION CAP(DUMMY)
DECORATION CAP(DUMMY)
DECORATION CAP(DUMMY)
BUTTON FUNCTION (6KEY)
BUTTON FUNCTION (KEY)
KNOB ENCODER
KNOB ROTARY
KNOB MAIN
BUTTON POWER -A
BUTTON POWER -D
BUTTON STANDBY
INDICATOR
BUTTON MEMORY (10KEY)
BUTTON RDS(SKEY)
BUTTON MEDE (3KEY)
BUTTON TUNNING (9KEY)
BUTTON TUNNING (9KEY)
BUTTON PUSH
BRACKET PHONE
SHIELD TONE
SWITCH BALANCE
SWITCH TREBLE/BASS
JACK RCA (3P)
VOLUME MOTOR
SWITCH ENCODER
HOLDER FL
SWITCH TACT
JACK PHONE
SWITCH PUSH
SWITCH PUSH POWER
INDICATOR FUNCTION
HEAT SINK POWER
CHASSIS MAIN
SPONGE
SPACER
FOOT AL
FOOT PL
HEAT SINK REG TR
HEAT SINK REG TR
AC OUTLET
AC OUTLET
AC OUTLET
SPK TERMINAL (8P)
RCA JACK (4P)
RCA JACK (6P)
FASTENER
BRACKET INSERT
RCA JACK (2P)
SPK TERMINAL (2P)
SPK TERMINAL (4P)
DIGI LINK (1P)-A
RCA JACK (9P)
RCA JACK (4P)
ANT TERMINAL
ANT TERMINAL
CHASSIS BACK
CHASSIS BACK
CHASSIS BACK
CHASSIS BACK
GROUND TERMINAL
PLUG JUMPER
AC POWER CORD
AC POWER CORD
AC POWER CORD
CORD STOPPER
COVER TOP
INDICATOR KNOB
MECHANICAL PARTS LIST
PARTS NO. Q'TY VERSION REF. NO. DESCRIPTION
601704179003
601704179002
633004009201
632004005201
623004376401
E60101000000
E60501001000
110928400710
L10928400720
830004025W01
830004025W03
G670001R5012
570704593003
570704637001
570704593001
570704593002
306704599101
306704220102
306704220103
563704059101
507704490301
507704005301
507704490302
450704203104
512704095101
512704092101
509708933101
509704648101
5090055921101
509705064101
509006922101
509005907101
509005398101
$09006683101
§16004059301
509005920101
509005918101
$09005919101
§09708934101
$09704649101
509006682101
401004361601
307004653601
45511140200
45512140230
60604030000
49514530001
45004203001
432004078101
18004050001
40204016133
00004117000
00004159000
516004081301
212004087801
320004477601
405004434501
430004056101
400704102101
400004020104
212004429801
212004480801
43504014000
43004040001
43504011000
G61404021000
60240045003
60360092002
442004025301
307004558601
G60120116003
G61104031000
59404047000
40204207000
60790150001
60240045003
G59004047000
59004045000
320704283603
320704283601
320705320603
320705320603
61004006001
106304075000
106104005101
106104035103
106104040103
438004016201
300004475601
516004085301
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AK
O.RDS
xz
DORAY
ROS
AK
ROS
AK
D.ROS
AK
O,RDS
RDS
AK
D.RDS
D,RDS
O.ROS
AD
AD
ROS
22
Model No. : R325/R325RDS
PARTS NO. Q'TY VERSION
PCBS P.C.BDARD VOLUME
PCB10 P.C.BDARD TONE
PCB11 = P.C.BDARD SPKR SW
PCBi2_——-P.C.BDARD D-LINK
HARDWARE KIT
$1-S30. SCREW #B BTT3x8B BO2003008381 30
$31-S35_ SCREW #2 WPTC3x8Y Bo10530101W1 5
$36-S43. SCREW HEAT SINK 150704113601 8
$44-S47_ SCREW #B BTT3x88 BO20030083B1 4
$48-S51 SCREW #2 BTC3x20Y BO1053020181 4
$52-S53_ SCREW #2 WPTC3x8Y BO10530101W1 2
$54-S71 SCREW #8 BTT3x88 BO2003008381 17
$72-S73_ SCREW GROUND 150704099601 2
$74 SCREW #8 BTT3x88 BO2003008381 1
$75-S76 SCREW GROUND 150704099601 2
$77-S78 SCREW #6 BTT3x8B BO20030083B1 2
$79-S80 SCREW GROUND 150704099601 2
$81-S83 SCREW #8 BTT3x8B BO20030083B1 3
$84 SCREW GROUND 150704099601 1
$85-S93_ SCREW #B BTT3x8B BO2003008381 8
$94-S97 SCREW BSAM4x8B 802094008381 4
MISCELLANEOUS
POWER TRANSFORMAR, 120V 60tiz 820028101111 1 A
POWER TRANSFORMAR,220V 60h 820028101511 1° K
POWER TRANSFORMAR,230V 50iz 820028101121 1 D,RDS
PCB1 P.C.BDARD TUNNER 702005776000 1
PCB2 P.C.BDARD MAIN 702004048000 1
PCB3 P.C.BDARD SPKR 1
PCB4 P.C.BDARD AMP 702004044000 1
PCBS P.C.BDARD FRONT 702004049000 1
PCBE P.C.BDARD POWER SW 1 O.RDS
PCBE P.C.BDARD ST/BY SW 1 AK
PCB7 P.C.BDARD SURROUND 702005362000 1
PCBS P.C.BDARD INPUT 702004064000 1
1
1
1
1
PRODUCT SAFETY NOTICE
Each precaution in this manual should be followed during servicing.
Components identified with the IEC symbol 4 in the parts list are of
special significance to safety. When replacing a component
identified with A , 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 insulated from the supply circuit before
returning the product to the customer.