Pioneer TX-9100 KUW User manual

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<ART.001-0>
STEREO TUNER
TX-gtoo
FVV. KUW KCW FVA'V
SERVICE MANTIAL
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NOTE:
MODEL TX-9100 COMES IN FOUR VERSIONS DISTINGUISHED AS FOLLOWS:
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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
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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
DEIVODU-
LATO 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

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-20
6
ro -30
=
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LrJ
IJJ - 50
:l -60
A.
F
f -70
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6. TUNER CHARACTERISTICS
ANTENNA INPUT LEVEL VS. OUTPUT
LEVEL, NOISE & DISTORTION
OUTPUT T EVEL
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ft\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
Ytr-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
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f
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q
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=
5Ci
1F
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E -to
z
- -20
LIJ
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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
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