TX-9100 KUW
I
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:
<ART.001-0>
STEREO
TUNER
TX-gtoo
FVV. KUW
KCW
FVA'V
SERVICE
MANTIAL
I
1
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NOTE:
MODEL TX-9100
COMES IN FOUR VERSIONS
DISTINGUISHED AS FOLLOWS:
I
,l
Round
label on
rear
panel
Voltage
Type
KUW
KCW
FVZW
FW
120V
only
120V only
5-position
selector
5-position
selector
UL approved
(U.S.A.)
CSA
approved
(Canada)
FTZ
approved
(West
Germany)
General
export
model
<73D02M31D,
(\I)IqONEER'
TX-91ClO
1.
2.
3.
CONTENTS
sPECr FTCATtONS
..........
CONNECTION
DIAGRAM
FRONT
PANEL
FACILITIES
2
4
5
4. BLOCK
DIAGRAM
7
5.
CIRCUIT DESCRIPTION
5.1
Muting
Circuit g
5.2
MPX Decoder
Circuit
g
5.3 Pulse
Noise
Suppressor
g
6. TUNER
CHARACTERTSTTCS
..........
10
7.
DTSASSEMBLY
PROCEDURE
.....,.....
..................
11
8.
PARTS
LOCATION
8.1 Top View
.....,.....,..
12
8.2 Bottom
View
.......
13
9.
DIAL
STRINGING
PROCEDURE
....,
14
10.
ADJUSTMENTS ...............
..................
15
11. EXPLODED
VIEW
AND
PARTS
LIST...........
.....
17
12.
SCHEMATIC
DIAGRAMS,
P.C. BOARD
PATTERNS
AND PARTS
LISTS
12.1 Circuit Connection
Diagram
and
Miscellaneous
parts
List
..............
.........
21
12.2
FM Front End
(AWB-013,AW8-015)
............
24
12.3
AM/FM
lF Amplifier
Assembly
(AWE-0261
.......................25
12.4 MPX,
AF Amplifier
Assembly
(AWD-002)
.,..
92
12.5
Volume, Headphone
Amptifier
Assembly
(AWM-038)
.......
3g
12.6 Lever
Switch
Circuit Assembly
(AWS-032)
........................
40
12.7 Muting
Circuit
Assembly
(AWM-044)
............
41
12.8
Power
Supply Circuit
Assembly
(AWR-028)
.....................
42
13.
PACKING
METHOD
AND PARTS
NUMBERS ........,............
44
1 .
SPECIFICATIONS
SEMICONDUCTOR
FETs...........
6
1Cs...............
I
Transistors
...................
35
Diodes .....
27
FM TUNER
SECTION
Circuitry .. 3
MOS FETs 2-stage RF
Amplifier
5-gang Variable
Capacitor, 6-stage
Limiter
PLL
MPX
Circuit.
Usable
Sensitivity
(lHF)
....................
1.5pV
Capture
Ratio
(lHF)
.....
1dB
Selectivity
(
I H F
)
................................
90dB
Signal-to-Noise
Ratio ...
75dB
lmage Rejection
(98MHz)
More than 110dB
lF Rejection
(98MHz)
...
More than 110d8
Spurious
Rejection .......
More than 1 10dB
AM Suppression
................................
65dB
Harmonic Distortion Mono ...............
Less thanO.2%
Stereo ...............
Less than
0.3%
Frequency
Response
Stereo
..........
.....
2OHz- 15kHz
19:3
OA
Stereo...............
50Hz - 10kHz
1$.fr
Oe
Stereo
Separation
l kHz ...........
More
than
40dB
50Hz to 10kHz
.........
More than 30dB
Sub
Carrier
Suppression
..................... 65dB
Antenna lnput
........... ...
300Q Balanced
75S2
Unbalanced
Muting
.....
2-step Level
Switch
MPX Noise Filter
..........
ON-OFF
De-emphasis Switch
.....
50pS
+
75pS
(except
FTZ
approved and
120V
models.)
AM
TUNER
SECTION
Circuitry .. 1-stage RF Amplif
ier,
3-gange Variable
Capacitor
Sensitivity
(lHF,
Ferrite
antenna) 300pV/m
(lHF)
.......... .............
15ltV
selectivity
.....................40dB
Signal-to-Noise Ratio .... 50dB
lmage Rejection
...............
More than
65dB
lF Rejection More than
85dB
Antenna
.. Built-in
Ferrite Loopstick
Antenna
AUDIO SECTION
Output
(
Level/l
mpedance)
F
IXED
650mV/4.7kS2
VARIABLE
.....................
70mV-
2V13000
HEADPHONE
..........
150mV
(8O)
T)(-91
clcl
MISCE
LLAN
EOUS
Power
Requirements
.........
Power
Consumption
..........
AC
Outlet
Dimensions
.............
Weight
Without Package
With
Package
.........
FU
RN
ISH
E D PARTS
FM
T-type Antenna
Connection
Cord with Pin Plugs
Polishing
Cloth
Operating
I nstructions
Fuse
0.5A
F;;.r-i-fo
tS-tine
voltase
model only)
NOTE:
Specifications
and the design
subject
to
possible
modif ication
without notice
due to improvements
AC 120V
60Hz or
AC 110V, 12OV,130V,
22OV
and 240V
50/60H2
30w
Unswitched 1
430(W)
x 138(H)
x
345(D)mm
16-15116(W)
x
5-711G(H)
x 13-s116(D)
in.
8.9k9, 19lb
10oz
10.9k9, 24lb
1
1
1
1
1
2
2.
CONNECTION
DIAGRAM
AM
INTERIOR
OR
EXTE RIOR ANTENNA
For
30OS)
feeder
GROUND
FM
EXTERIOR
INTERIOR ANTENNA
ANTENNA
TAPE DECK
(Reel-to-Reel
or Cassette)
LINE
INPUT
terminals
HORIZ INPUT
term
i na
ls
STEREO DISPLAY
(SD-1
100)
or
OSCI
LLOSCOPE
VERT
INPUT
terminals
TUNER
INPUT
terminals
STE REO
AMPLIFIER
FUSE 1
A
NOTE:
lf rhe
TX-9100
is
of
the
5-line
voltage
type;
a 1A
fuse
is
used
for
either
110V, i20V,
or 130V
ope
ration,
and
a 0.5A fuse
for
either
22OV
or 24OV
operation.
There-
fore,
always
select correct
line
voltaqe
and fuse.
!
3-'-
AM FERRITE
ANTENNA
CONNECTION
P LUG
AC
OUTLET
unaffected
by
POWER
switch
setting
UNSWITCHEO
sOOW MAX
QoOOo
o.O
e. occ c OccO
3!.oooOgg.oO!
SPEAKER
SYSTEMS
TX-91clcl
5.
CIRCUIT DESCRIPTION
5.1
MUTING
CIRCU IT
The
block
diagram
in Fig.
1 shows
rF
sTGNAL
the
basic function
of this
circuit.
The
signal
path
is
grounded
when
the relay
contacts
are closed.
Synchronizes
timing
of
audio signal with
that
of noise suppres-
sion
pulse.
Signal
level
is
maintained
constant
during
OU T PUT
Fis.
1
STEREO
INDICATOR
LAMP
Fig.2
Fis.
3
9
I'/U
T ING
SWI
TCH
5.2
MPX
DECODER
CIRCUIT
The
MPX
decoder
is
a
radically
new
design operating
on the
PLL
(phase
locked
loop)
principle;
it
has
no
capacitances
or induct-
ances.
Its function
is evident
from
the
block
diagram in Fig.
2.
VCO
stands for
Voltage
Control
Oscillator
its
oscillation
fre-
quency
varies
with the
supplied
input
voltage. Adjust
the free-
running
frequency
control
so that
the frequency
becomes
76kHz
(19kHz
at the TP
terminal)
when
no
signal is
present.
5.3 PU
LSE
NOISE
SUPPRESSOR
The Pulse
Noise
Suppressor
(PNS)
circuit
is included
to eliminate
pulse-type
noise
signals as caused
by
automobile
ignitions
etc. Fig.3
shows
the
block
diagram
of this
circuit.
The
circuit is
so designed
that
it
will
not function
when
a
very
weak signal
with considerable
inherent
noise
is
being received.
CO MPOS ITE
SIGNAL
No output when
phase
dif ference in
input
is
90"
AUDIO
SIGNAL
Oscillation
frequency
changes
so that
phase
relation
to
input
signal
becomes
gO"
SCHMITT
CIRCUIT
SCHMITT
CIRCUIT
IF
SIGNAL
lo,o,o
,l
OUTPUT
norse
suppresslon,
by
integrated
circu it.
TECTO
tc
Ic
--l
f--
DIFFE.
RENTIAL
I r-IAMP &
I i lsrrqsrruc
rr CIRCUIT
DC
potentiai
when
DC
VOLTAGE
SENSOR
NOISE
LEVEL
SENSOR
y'
nrr-nv
PHASE
COMPA
ATOR
vc0
(76kHz)
fx
1/2
(38kHz)
ad
iustment
SWITCHING
SIGNAL
(38kHz)
OMPARATOR
DEIVODULATO
R
Stops noise
suppres-
sion
pulse
when
input
Y,il;|Sxfu
;L'll!
r'?il
G ENERATES
NO ISE
SUPPRESS ION
PULSE.
/
GATE
CIRCUIT
EVEL
ENSOR
FILTER,
AUDIO
AMP
o
-10
-20
6
ro
-30
=
J
-40
LrJ
IJJ
-
50
:l
-60
A.
F
f
-70
o
6.
TUNER
CHARACTERISTICS
ANTENNA INPUT LEVEL
VS.
OUTPUT
LEVEL,
NOISE
&
DISTORTION
OUT
PUT
T EVEL
I
f
t
\
Dummy
ant.
imp.:3OOQ
Bal.
type
Carrier f
req.:98MHz
Mod. freq.:4OOHz lOO%
Output
level:OdB=
2V
Output
terminal:VARIABLE
f'.
t.No
ISE
LEVEL
-DIS
Y
tr-ioN
-80'
' '
'
'
' '
--o
to 2o
30
40 50 60
70
80 90
loo
110 120
(1!v)
(logV)
(lmv)
1loomV)
{tv}
ANTENNA
INPUT
LEVEL
lN
dB(0dB=ltrlv)
MPX
FREOUENCY
vs.
SEPARATION &
DISTORTION
FM USABLE
SELECTIVITY
CHARACTERISTICS
-/tOOk
-2OOk
0 20Ok
40Ok
FREOUENCY
lN
Hz
Qummy
-ant.
imp.:3OOe
Bal. type
Carrier
freq.
:98M
Hz
Output terminal :VARIABLE
Undesired/desired
signal
output
ratio:-3OdB
Undesired
signal:4OOHz
1OO%Mod.
x
DESIRED SIGNAL
LEVEL
3.0
2.5
2.O
1.5
r.o
o.5
I
dt
'io
l
2
-J
LrJ
I
LrJ
O\f,
zg
I
OJ
i
jz
'o
6
o
UJ
tr
o
ut
o
2
f
6
!l
I
;
I
G
q
IJJ
o
);q
=
5Ci
1F
o
E
-to
z
-
-20
LIJ
i
-.0
F
-40
o.
5
-uo
o
-60
-70
Dummy
ant.
imp.:3OOQ
Bal.
type
Carrier
freq.:geMHz
, input level:6OdB
Deviation:L+R:67.5kH2
Pilot: 7.5kHz
4
68100 2
4 68lk
2 4 6810k
2
MODULATION
FREOUENCY
tN
Hz
MPX FREOUENCY
RESPONSE
20
4 58100 2 4
681k
2
4
6
Dummy
ant. imp.:3OOe
Bal.
Carrier f req.:98MHz
Deviation:75kHz
Ant. input
level:6OdB
Outgut terminal:VARIABLE
10
MODULATION
FREOUENCY
lN
Hz
TX-91clcl
7 . DISASSEMBLY
PROCEDURE
1. To
remove
the
wooden
case, first
remove
the
two
screws in
each
side
of the
wooden
case,
then lift
up the
case
by
its
rear
edge.
2. Pull
off all
knobs. To
remove
the TUNING
knob,
first
loosen
the
two
screws,
then
remove
the knob,
using
a hex
wrench.
3.
The
front
panel
can
be
pulled
off
after
removing
five
screws
-
two
in its
top edge,
three
in
its
bottom edge.
4.
For
removal
of the
bottom
plate,
a total
of
eight
screws
have
to
be removed.
14
FRONT PANEL
11
8.
PARTS
LOCATION
8.1 TOP
VIEW
ANTENNA
TERMINAL
BOARD
Kil-043-D
PHONO
JACK
(2
JACKS}
AKB-o13-0
AM/FM IF
AMPLIFIER
ASSEMBLY
AWE-026-0
KNOB
(MUTING,
NOISE
FILTER,
P.N.S.)
AAD-O4O-B
KNOB
(TUNING)
AAA-017-A
FRONT PANEL ASSEMBLY
ANB-189-0
FM
FRONT END
AWB-o13-O
AWB-015-O
POWER
TRANSFORMER
ATT.113.O
(KUW)
ATT-114-O
(FVZW,
FW)
ATT-133-0
(KCW)
TUNING
METE
AAW-o16-4
AC POWER
CORD
ADG.OO3.O
(KUW,
KCW)
ADG-OO4-O
(FVZW,
FW)
MPX, AF
AMPLIFIER
ASSEMBLY
AWD-002-O
KNOB
(OUTPUT
LEVEL)
AAD-O40-B
PHONO JACK
(4
JACKS)-A
AKB-014.0
SIGNAL METER KNOB
(POWER
AAW-015-0
AAB-043-0
EFI
T2
8.2
BOTTOM
VIEW
KNOB
(FUNCTION)
AAB-041-0
LEVER
SWITCH
CIRCUIT
ASSEMBLY
AWS-032-0
FUNCTION
SWITCH
ASC-046-B
T)(-91clc'
AM
FERRITE
LOOPSTICK
ANTENNA
ATB-021-0
FERRITE
ANTENNA
HOLDER
ASSEMBLY
w72-O92-C
TUNING
SHAFT
ASSEMBLY
AXA-027-A
MUTI NG
CI RCUIT
ASSEMBLY
AWM-044-0
r-r
BB
l
LJ
,I
r-lo
trEtr
ll
tI
EE
[r
POWER
SWITCH
ASK-054-O
(KUW,
KCW)
ASK-055.0
(FVZW,
FW)
POWER
SUPPLY
CIRCUIT
ASSEMBLY
AWR-028-O
CHASSIS
MOUNTING
AC
SOCKET
AKP-002-0
VOLUME,
HEADPHONE
AMPLI FIER
ASSEMBLY
AWM-038-O
FUSE
HOLDER
AKR-OOs-O
(KUW,
KCW)
AKR-OO1-O
(FVZW,
FW)
13
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