Clarion RU-348A.B Service Manual
MODEL
RU-348A.E}
'n
l,j
r"o,i."nr,
Ql_;{RION
CO., LTD./e,m,r"tion., CLARION SHOJI
CO.,
LTD.
3, Koiimachi
5-chome. Chiyoda-ku, Tokyo.102 J.p.n l.l.:
{2651
2931 TGl.x:
J22908. J22152 CLAnISHO
Succursl6 outru-mer:
GLARION SHOJI
(EURCIPAI
G.M.B.H.
2OOO H.mbu.g 76.
Sch6n. Aussicht 35.
Wort Gcrmenv. r.t
2zo.r66t
reter 41214969
CLARION SHOJI
CO.,
LTO.
{U.S.A.I
55oO Ro!.cr.os
Avc.. Lrwnd.t..
C.tif.. 90260 U.S.A. Tct.:
213-973-fiOO
T.tex
€6.4447
CLARION CORPORATION OF AilIERIGA 55oo
nosacrlns Avc..
L.wndste.
c.tit..
90260
U.s.A. TGt :
2t3-973rloo
T6tex
66-4447
CLARION CORPORATION OF AMERICA. EASTERN
DIVISION
421
Norrh M.dtand ave..
saddte Brook. N J. 07662
u s A r.t
2ol-7el.12oo rct€x 138os
CLARION
(MALAYSIAI
SON. BHO. 9l/2 m.s.
B.y.n
t.pts, P.n.ng. Mrlaysia Tcr.:697-206.897-334
Tctex: PG 255
(Pcnans)
CLARION
DC) BRASIL INDUSTRIA E
COMERCIO
LTOA. c.ira Postlt
5033. sao
pauto.
B.asit r.t.:
32-sl6l reter: 3821123
CLARION
(HONG
KONGI
CO,,
LTD. 225 Ping
Chru
G.tt.ry, Occ.n T..min.t.
Kowtoon. H
K
Tct.
j
3-675785 Tolex: HK492
2
MODEL
RU.3484
MODEL
RU.348B
SPECIFICATIONS
Circuit SVstem:
Tuning
System:
Receive range:
I ntermediate
frequency:
Maximum
sensitivity:
Practical
sensitivity:
lmage
rejection ratio:
lF rejection
ratio:
%
lF
rejection
ratio:
AFC:
AGC
FOM:
rSelectivity:
Limiter sensitivity:
ST I ndicator
sensitivity:
ST
Separation:
Electrical
fidelity:
Superheterodyne
Manual
p-tuning
s-push button
system.
AM
53OKHz
-
1605KHz
FM
88MHz
-
108MHz
AM 452.5KH2
FM 10.7MHz
AM Less than
22dB
FM
Lessthan
18dB
AM Less
than
24dB
(at
S/N 2OdB)
FM
Less than
'l8dB
(at
S/N 30dB)
AM More than
60dB
FM More
than
35dB
AM More than
4OdB
FM More than 70dB
FM
More than
60dB
FM 4O0KHz
-
700KHz
AM Less than
26dB
AM
More
than 2OdB
(at
t
IOKHz
detune)
FM Less than
30dB
FM
Less than
30dB
FM More than
20dB
{400H2)
AM
100H2
4000H2
FM
100H2
7000H2
Load
impedance:
Power
output:
Power
supply
voltage
Dimensions:
Weight:
Semiconductors:
FM
RF amplifier
Frequency mixer
Local oscillator
AFC
I F
amplif ier
D
etector
Pre
amplif
ier
MPX
AM
RF amplifier
Frequency
converter
lF
amplif
ier
AGC
Detector
Audio output
amplifier
Voltage
regu lator
4f2,
4W x
2
(for
10%
distortion)
More
than
6W
x
2
(f
or max. volume)
DC.14.4V
{11V
-
16V) Nagative
gro
u nd
width
H eight
Depth
1.2k9
2SC1342
x
1
2SC535B
x
1
2SC461B
x 1
oo1
.0130-00x
1
(152790wT)
2SC46OB
x
4
00
1-O020'00x
2
(tN6OP)
2SC460B
x
1
051-0O56-00.01x 2
2SC460B
x 1
O01-O095-O0
x 1
(152O76)
2SC454B
x
1
2SC454B
x 1
0O1-00'10-00
x
1
(1N34A)
0O1-OOIO-OO
x
1
(1N34A)
051-0036-02. O3
x
2
(HA-r
322)
OO1-O099-Ol x 1 {H278)
160m/m
50m/m
120m/m
H
+4r3bB
L
+7+3dB
H
-15+sdB
L
-26t5dB
H
+2+3dB
L +3+3dB
H
-15tsdB
L
-28tsdB
.
l P,int"d
in Jooon 298-17 Rs
-oott
lilllllll'I
*
COMPONENT
RU-348A-01
280-334400
VIEW:
Main unit
Owners
guide
1
1
3004976{)0 Mounting bracket 1
922-O778fi
Partsbag
*33Hl
KNOB
RU-3488-01
Main
unit
280-3326-00
Ownersguide
@
*333m
KNOE
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WASER
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D-sEMs-HEX-BoLT
921-6232-00
Parts
bag
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NOISE.SUPPAESSOR
*
ADJUSTMENT
METHODS:
Adjustment of AM
tuner
1-1 lnstruments required
AM
stand€rd signal
generator
(SSG)
AM
lF
siveep
generator
(452.5KH2)
Oscilloscope
Dummy
load
(4Ql
VTVM
Dummy
antenna
(see
below
F ig.
1 .l
921€194{P
Parts
bag
722-0231-OO
SPECIAL
NUT
1.
o---l
Fig. 1l
@-,
745-0430-Ot
SPECiAL
WASHER
*
FEATURES:
o
Use
of monolithic
power
lC
in
the audio section
assures
highquality
reproduction
and
high reliability.
o
Considering
variations in climatic conditions, superb silicone
transistors capable of operating both at
high as
well
as
low
temperature are used.
o
Stable
operation
is
assured
against
power
supply
voltage
fluctuation
by
using
a constant-voltage diode.
-2-
1-2
Adjustment
of lF
Section
-1.
Connect
the sweep
generator
output
to
TPS and
oscilloscope's
vertical
terminal to TP6.
Turn
the tuning
knob of the set
fully
clockwise.
2.
When the sweep
generator
f requency
is
set
to
452.5KH2
and its output
level
is increased, a waveform
as shown
in Fig-
2
is obtained.
Keep the
output
of
SSG
as small
as
possible
and
the
vertical
gain
of
oscillosc()pe
as
large
as
possible.
3.
Adiust
the
cores
of I FT4 and
lFT5 of obtain
maximum
height
of the waveform
with
good
symmetry.
1-3 Tracking
adjustment
Apply the output of
SSG
to the set through dummy
load-
Bring
the
set's dial
pointer
to
the
maximum
frequency
point
on the
dial and set
the
AM SG
to 1620KH2.
Adiust the OSC trimmer
(TC6l
to
receive
162OKHz-
Next set the
dial
pointer
to the left end
(minimum
receiving frequencyl,
set the
SSG
signal to
520KHz,
and
adjust
L4
to receive this
signal. Repeat these adiustments
2
-
3 times
so
that the receiving
band width
becomes
52OKHz
-
1620KH2.
Now adjust the
ANT
trimmer
(TC4)
and RF trimmer
(TC5)
on the same
frequency
so that the
Audio
output
becomes maximum.
15
-
20dB output of
SSG
is
suitable
for
the
adiustment.
The
volume
and tone controls must
be
at maximum
position.
2.
Adjustment of FM
tuner
2-1 lnstruments
required
FM
standard signal
generator
(SSG)
FM
lF
sreep
generator
(10.7MH2)
Oscilloscope
Dummy load
(4Sr)
VTVM
2-2
Adjustment
of lF
section
1.
Connect
the
sweep
generator
output to TPI and
oscilloscope's vertical terminal to TP2.
Turn the tuning
knob of the set
fully clockwise.
2.
With the sweep
generator
frequency set
of 10.7MHz
when
the output
level
of
the sareep
generator
is
gradually
increased,
waveform
shown
in Fig.
3
appears
on the CRT screen.
Now
perform
the
following
adjustment.
Keep the FM SSG
output as
small as
possible
and the
vertical
gain
of oscilloscope
as
large
as
possible.
3. Adjust
the core
(green)
of lFTl
for
maximum
height
of
the
waveform
with
good
symmetry.
Adjust
the
core
(blue)
of lFT3 for
maximum
height
of
the waveform.
4.
Connect
the
vertical terminal of oscilloscope
to
TP3.
Adiust
the core
(black)
of lFT3 for
good
linearity and
good
symmetry
of the s-curve.
2-3
Tracking adjustment
1.
Turn the
tuning knob fully
counterclockwise
(lowest
receiving
f requency
position).
Adjust the
OSC trimmer
(TC3)
to
receive
87.5MHz
from
the FM
SSG.
2. furn the
tuning knob
to
receive
98MHz.
Set
the
output
of FM
SSG
ro
approximately lOdB
and adjust
the
ANT trimmer
(TC1)
and RF trimmer
(TC2)
to
obtain
maximum
audio output.
At this time,
the volume
control and tone
control
knobs
must be at maximum
position.
2-4 MPX
section adjustrnent
1.
Turn the
ST-MO witch OFF.
(Monoral
reception).
Connect the
oscilloscope vertical input
to
TP.4 and
apply
a
precalibrated
19KHz
signal
(stereo
modulator
calibration
use
signal)
to
the horizontal input.
Adiust
the
semi-f
ixed
control VR5
so that the
Lissajuous
waveform becomes almost
stationery.
(
lf
a
frequency
counter is available,
connect it to
TP.4
and adiust
VR5 so that the frequency
becomes
exactly
19.OKHz).
-Adiustment
of the
frequency
of voltage controlled
oscillator
(vco)-
2. Connect the
stereo modulator to
FM
SSG
and
set to
the
specified
modulation
depth
(pilot
signal 7.5KHz).
Turn the
ST-MO sryitch ON.
(Stereo
receptionl.
Set the
SSG output to about
25d8.
Adjust the
semi-fixed control VR4
by turning it in the
counterclockwise.
direction to a
position
where the
ST
indicator
lights.
-Adjustment
of lndicator lamp
sensitivity-
3. This
adjustment of lamp
(lighting)
sensitivity must
be
performed
after the adjustment
of VCO frequency.
The
sensitivity increases
when
VR4 is turned
counter-
clockwise
and increases
when VR4 is turned
to clock-
wise direction.
t
Betore
adjustrnent
Alter
adiustrnent
lFis.ql
Does not
become
perfectly
round
because
the
Lissajuous
figure
is formed
by
the
rectangular
wave-
form
(TP.4
outputl and
sinusoidal waveform
(calibra-
tion
use
19KHz
signal).
ffi
*
TROUBLESHOOTING:
(Refer
to the circuit
diagram
and
printed
board.)
Symptom
Faulty
circuit
Place,
cause of
fault
Action
No sound
at all
Power
supply
circuit
a
Fuse open
a
Bypass
capacitor
short
o
T1
(choke)
open
a
L.t
(coil)
open
o
Cso,
n
n6-470l,
,
Ce3
(1O-330)
faultv
O
Rr:.
R75
oPen
ta
Zeener diode
(D7)
short
Replace
Replace
Replace
Replace
Replace
Replace
Replace
AF
circuit
a
Speaker
faulty
o
Speaker
lead open
o
Bypass
capacitor
short
o
Ctd,
e1
(10-lOOO)
faulty
o
tC2,
r
(051-0036-02,
O3)
faultY
Replace
Replace
Replace
Replace
Replace
AM section
o
lFT4,5
open
o
Os,
ro, 1l
faulty
o
TCa,
s,6
short
o
Tuner
coil
(Ll
)
open
o
C+r,
Ccq, Cqs,
C5s
faultY
Replace
Replace
Replace
Replace
Replace
FM section
O
a
lFT1,2,3open
O1
-
s
faultY
Tuner coil
open
lcr
(051-0056-o0)
faulty
CCTa,
5
faultY
o
o
a
Replace
Replace
Replace
Replace
Replace
Sound
is low or sensitivity
is
poor
AF
circuit
I
lCz
o
Cto
o
Ctt
3
(051-0036-02,
O3) short
or
faulty
el
(10-10OO)
capacity
down
qz
(5O-11
leaking
Replace
Replace
Replace
AM section
3
TC+,
5, 6
misad.iusted
o
Lr
coil
open
o
Oq,
to, ll
deteriorated
o
lFTq,
5
misadjusted
.
Dq
(1520761
deteriorated
o
Tuner
coil open,
etc.
Read.iust
Replace
Replace
Readjust
Replace
Replace
FM section
I
TCr,
2,
3
misadjusted
a
Ot
-
Sdeteriorated
o
lFTr,
3
misadjusted
o
Tuner
coil open,
etc.
'
Dz,
3
deteriorated
a
ANT shield wire
ooen
or short
Readjust
Replace
R eadj usl
Replace
Replace
Replace
o
AM,
FM
s
,atch taulty
a
ANT
receptacle contact
faulty
Heprace
Replace
Sound
is
distorted
AF circuit
I
lCz,3
(O51-0036{2,03)
short
or
faultv
a
Speaker
faulty
Replace
Replace
AM
section
3
R+e, Rr:,
Ds, D5s
faultY
Replace
FM
section
o
Os,
lCr
(051-0056-O0)
faultY
o
Dz,
g
faulty
o
CCT:
faulty or short
Replace
Replace
Replace
Abnormal
sounds
(motorboating,
osillation)
AF
circuit
a
Cgr,
Cqo, C9?
capacity down
lC2,
3
(051-0036O2,
03)
faulty
a
Replace
Replace
AM section
o
Cqq,
C+s, Css, Cso,
Css, C51
faultY
Replace
FM section
'
Csz,
33,
94
capacity down
a
Each
bypass
capacity
faulty
O
Fach clecouolino caoacitor faultv
Replace
Replace
Renlace
o
C9s
capacity down
Replace
lndicator does
not light
MPX section
3
VR+,
s
misadjusted
a
SWr
faulty
o
C:+,
Ca?
capacity down or
faultY
I
PLz, R46
oPen
or faultY
Readj ust
Replace
Replace
Replace
Stereo offect is absent
MPX section
o
Cso,
Caz, Crs,
C36 faulty
I
Rea,
R37
oPen
Replace
Replace
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