Pioneer TX-9500II User manual

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Type Voltage Remarks

KC 120V

only CSA (Canada)

approved with de-emphasis

selectorswitch

(25psl75psl

KU 120V

only UL (U.S.A.) approved with de-emphasis

selectorswitch

l25trs/75psl

HG 22OY and 240V (Switchabte) SEMKO (Sweden),

NEMKO (Norway), DEMKO (Denmark)

and El (Finland)

approved

S110V,

120V,

22OV

and

240V

(Switchabte) Generalexport model with de-emphasis

selectorswitch

l25ysl50ps/75psl

TX-g'5ClCltr

MODEL

TX-gsOOII

COMES

tNFOUR

VERSIONS

DISTINGUISHED

FOLLOWS:

. Service

informations

forTX-9500II/KU

isdescribed

onpage

5through

52inthismanual.

o Forservacing

of Kc, SandHGtypes

please

refer

to TX-9500II/KUmanual

with theexception

descriptions

inthe

"Additional

ServiceManual"

(p.53-p.86).

CONTENTS

CONNECTION

DIAGRAM

SPECIFICATIONS

BLOCK

DIAGRAM

FRONT

PANEL

FACILITIES

CIRCUIT

DESCRIPTIONS

5.1 AMTuner

5.2 FM

Tuner

DISASSEMBLY

5.3 REC

LEVEL

CHECK

5.4 Power

Supply

CircuitSignal

Generator

Circuit

PARTS

LOCATION

7.1 Front

Panel

View

7.2 Front View with Panel

Removed 17

7.3 Top

View

7.4 RearPanel

View

8. DIAL

CORD

STRINGING

9. ADJUSTMENTS

9.1 FMSection 22

9.2 AMSection 26

10. EXPLODED

VIEWS

10.1 TopSide 27

1O.2 Bottom

Side. 29

10.3 Nomenclature

of Screws,

Washersand

Nut ... . . . 31

11. PACKING 32

12. SCHEMATIC

DIAGRAMS,

P.C.BOARD

PATTERNS

AND

PARTSLIST

12.1 Schematic

Diagramand

Miscellaneous

PartsList 33

12.2 FMFront

End

(AWB-023)

. 36

12.3 AMFM

lFAssembly

(AWE-070)

... 37

12.4 MPXAF Assembly

(AWD-009) 45

12.5 PowerSupply

Assembly

(AWR'128) 50

Additional

Service

Manual

1. CONTRAST

MISCELLANEOUS

PARTS 54

2. KCTYPE

2.1 Schematic

Diagram

and

Miscellaneous

PartsList

2.2 PowerSupply

Assembly

(AWR-I29)

2.3 Packing

3. HGTYPE

3.1 Schematic

Diagramand

Miscellaneous

PartsList

3.2 MPXAF Assembly

(AWD-008)

3.3 Power

Supply

Assembly

(AWR'I30)

3.4 Packing

4. STYPE

4.1 Schematic

Diagramand

Miscellaneous

PartsList

4.2 MPX

AF Assembly

(AWD-010)

4.3 Power

Supply

Assembly

(AWR-I31)

.. ..

4.4 Switch

Assembly

(AWX-113)

4.5 Packing

SPEC|FtCATIONS

Semiconductors 5

FETS

lCs

Transistors ......12

Diodes ....19

FM Section

Circuitry . . . MOS FET 2-stageRF ampli-

fier,

5-gang

variable

capacitor,

lF Band

Selector,Wide-band

linear detector, doublebal-

anced

NFB type PLL MPX

built-in p

ilot signal auto

cancel

ler.

UsableSensitivity

. . MONO: 8.8dBf

(1.59V)

50dB

Quieting

Sensitivity. . MONO: 13.2dBf

(2.5tN)

STEREO:36.1dBf

(35pV)

Signal-to-Noise

Ratio

at65dBf MONO: 82dB

STEREO:71dB

Distortion

65dBf MoNo: wlDE NARRow

100H2 0.05% O.OIY,

l kHz 0.05% O.jlY'

10kHz O.07o/o 0.1Yo

15kHz 0.12Y"

STEREO:

100H2 0.17o O.3Vo

l kHz 0.07o/o 0.25%

lOkHz 0.2Yo 0.5%o

15kHz O.57o

Capture

Ratio.. . 0.8d8 2.0d8

AlternateChannel

Selectivity. . . 35dB 85dB

StereoSeparation.. ..lkHz: 50dB 45dB

50Hz

to 15kHz: 35dB 30dB

Frequency

Response 20Hzto 10kHz+0.2dB

2oHz

stHzloo']aa

SpuriousResponseRatio

. . 11OdB

lmage

ResponseRatio. . . . 120d8

lF ResponseRatio . 105dB

AMSuppression

Ratio

. . . . 65dB

Muting

Threshold . . 19.2dBf(5

ttY),34.1d8f(28pv)

Subcarrier

Product

Ratio

. . 11dB

SCAReiection

Ratio

. . . . . 62dB

Antennalnput

. ... 30Oohmsbalanced

75ohmsunbalanced

TX-s|5clCltr

AM Section

Circuitry ...lstageRFamplifier3-gang

variablecapacitor

Sensitivity

lHF,ferriteantenna

.. . 300pV

lHF,

external

antenna. . 15pV

Selectivity . . 30dB

Signal-to-Noise

Ratio.. . . . 55dB

lmage

ResponseRatio

. . . . 70dB

lF ResoonseRatio.. .... 65dB

Antenna ... Built-in ferrite loopstick

antenna

Audio Section

Output

(

Level/lm

pedance)

('100%

MOD.) FIXED: 650mV/4.2kO

VARIABLE:50mVto

1.3V/3.6ks2

AM (30%

MOD.) . FIXED: 2OOnYl4.2kQ

VARIABLE:

'l5mV

400mV/3.6kO

Miscellaneous

Power

Requirements 120V60Hz

only.

PowerConsumption

. . . . . 25W

Dimensions . a20(W)x150(H)x395(D)

mrr

16-9

16x5-7

18x1

5-9l1

6 in

Weight .... WithoutPackage:

9.5kg

(201b

15oz)

WithPackage:

11.0kg

(241b

4 oz)

Furnished

Parts

FMT-typeantenna ....1

Operatinglnstructions ......1

ConnectionCordwithPinPlugs .....I

Hex.Wrench

(used

forfasteningTuning

knob). . . . . . . 1

NOTE:

Specifications

and.the

designsubject

topossible

modifica-

tionwithout

notice.

2.CONNECTION

DIAGRAM

FM DE.EMPHASIS

SWITCH

Normafly, set this s,witch to "75tts."

Be sure to set it to "25ps." only when

listening to an FM broadcast (pre-

emphasis:25psl with a Dolby* system.

TX-9500[

GROUND

OSCILLOSCOPE

The

word

"Dolby" isatrademarkof Dolbv LaboratoriesInc.

TTYPE

FMANTENNA FMOUTDOOR

(ifstations

are

nearby) ANTENNA

AM ANTENNA

(indoor or outdoorl

DISCRETE

4CHANNEL

FM ADAPTOR

I *-J-=

rl I

i----

AM FERRITE

BAR

ANTENNA

CONVE]\

OUTLET

coupledv

power sr'\,

t- |

t=J

:NlENr

iT (not

Iwith

witch)

_JTII

power

lf-

lls

I lr5

L-

oosoo16;sO

b'ossoifdon

TAPEDECK STEREOAMPLIFIER

3. FRONTPANELFACILITIES

POWERSWITCH

Setto ONposition

to turnonpower.

Pilotlamp

will light.

MULTIPATH ON: Multipath sound becomesaudible

from speakers.When installing FM

antenna, select antenna location and

directionso as to minimizethis sound.

Normally

setswitchto this

position.

RECLEVEL CHECKON: Usethis position

for setting

recordinglevelsof tape deck. A 44OHz

signal

(level

correspondingto 50% FM

modulation) is produced at approxi-

mately1.7

second

intervals.

SIGNAL

METER

Employ when tuningAM

tuning point occurs

when

toward

therightisobtained.

and FM stations.

Optimum

maximum meter deflection

TUNING

Usewhen

deflection

tune carel

(optimum

MUTING

Controls

noise

whr

tuning

opr

OFF:

PILOT

LAMP

IF BAND

SWITCH

FM lF (intermediate

forwide

ornarrow. frequency)

passband

canbe setto

WIDE: Normally

setswitchto this

position.

NARROW: lf adjacentstation

interference

isa pro-

blemat the WIDE setting,setswitchto

this

position.

MULTTPATH/RECLEVEL

CHECKSWTTCH MEMORY

MARKERS

Single

leveroperatesbothMULTIPATH

andRECLEVEL

CHECK

switches.Withthe FUNCTION

switchat FM,

set

asrequiredfor the application.Besureto returnit to the

OFFposition

when

it isnotbeing

used.

tFBAND

INDICATOR

Convenient

for designating

most

oftentuned

in stations.

Slidemarkers

with fingertip

to desired

positions.

OUTPUT

LEVEL

CONTROL

Adjusts

levelatOUTPUT

(VARIABLE)

jacks.

Clockwise

rotationincreasesoutputlevel.

OFF:

;.Optimum

' deflection

TUNINGMETER

Usewhen

tuning

FM stations.Firsttunefor maximum

deflection

of theSIGNAL

meter

(tov,ard

the

right),

then

tune carefullysothat the meterindicates

centerof scale

(optimum

tuning

point).

oraorueen

srEFEo

ruNEr

il-9500]l

MUTING

SWITCH

Controls circuit for cancellingbothersomeinterstation

noisewhentuning FM stations

to provide

a comfortable

tuningoperation.

TX-s|5ClCltr

FM STEREO

INDICATOR

with the FUNCTTON

switch

set

to FM AUTO (or FM

NOISE

FILTER),

the indicaror

will light

during

stereo

signal

reception.

FUNCTION

SWITCH

Switch

for selecting

type

of reception.

AM: AM broadcast

reception.

FM AUTO: FM stereoreception.

lf broadcast

isFM

mono, the mono modeisautomatically

selected.

FM NOISE

FILTER: Ser to this position

if compara-

tively high frequency noise becomes

objectionable

during

stereo

reception.

Note that someloss

of stereo

separation

occurs

atthis

position.

FM MONO: FM monophonic

reception.

Set to this

position

if reception

at FM AUTO posi-

tionis

noisy

or signals

weak.

TUNING

KNOB

Knob for selecting

stations.Refer

to theSIGNAL

meter

when tuning AM stations

and to both SIGNAL and

TUNING

meterswhen

tuningFM

stations.

)ICATOR

-_l

___l

Clockwise

OFF:

Set to this position to receiveonly strong

stations.

lf desired

stationcannot

bereceivedatposition

2,setswitch

to this

position.

Setto this position

in locationswheresignals

areextremelyweak.

4. BLOCK DIAGRAM

FI,{

FRONT

END

l'-- Rr -; -- RFam; - f1i*"

!. crq rctr*@l -5.@l

I lr'€i

,F I lrefl

It--- --i--L-- --_ --/ t L--r

ISWITCHES.

S'a^t ' FUNCTI0N

AM 7.

Sz,r,b

: MUTING

1 OFF 7.

S:a'd ' f40DE

1.IIULTiPA

S4a,b

' lF BAND

NARROW

15o

3000

CND

Loca

| 0SC

POW

0N<--) OFF

DE-

ENPHA:

flixer

1 Buffen

F11IF AHPLIFIER

& DETECTOR

t- WIDE

n*ftr;--rtr;-\

L=Jr=LL4Ld

Frf r Yr r7

--t ---1 --1 --1

Ceramic

ilfen

NARROW

Cer^am

filfer^

J1A

TUNING

meter'

detecton

WIDE

rnd.

NARROW

lnd

FI1IFAMP

MUTINGCONTR

CIRCUIT

SIGNAL mefer-

AI1 TUNER __J

Al1

Our

SWITCHES.

S'a^ t :

S2,r,

b i

S34-

d :

NCTION

AM 2 FI'1

AUTO

3, FI"]

I1PXNOISE

FILTER 4. FM

I4ONO

IlUTI

1 OFF ?. 1 3.2

11O

1.IIULTIPATH

ON 2.

OFF 3.

REC

LEVEICHECK

S4a,b ' lF BAND

NARROW

E WIDE

(. ' POWER

--+ 0FF

56 : DE-

ENPltnSf

S 25aS

*-t5l.5

Separ

ion adL

U:- --J

-IFIER-&

DETECTOR

detecl-on

- *+-;"rt I

1--th-Xl I r'rct' :

T1PX

DEMODULATOR OUTPUT

LEVEL OUTPUT

,\i

AF MUTING

CIRCUIT

lrVARIABTE

L-r

FIXED

r ULTIPATH

HORIZ

(DtT

OUT)

VERT

.J5

#c-->AC LINE

t6 o Stn

5os

Q+va

L.PF.

3AF

MUT.

-_Jl REC

LEVEL

OSC.

l--r--.l

rLs.- --i

I o q.^

I "JU

l*r

L------r'\ |

src I I

S'a

l__ __ L _)

POWER

SUPPLY

5.CIRCUIT

DESCRIPTIONS

5.1 AM TUNER

The major components of the AM tuner are the

3-gangedvariable capacitor, a newly developed IC

(HA1197), and an AM ceramic filter. A block

diagram

of the HAlL97 isshown in Fig. 1.

This IC consists of an RF amplifier first stage,

followed by a mixer stage which also includes a

self-oscillating local oscillator, the IF amplifier 3rd

and 4th stages,and a detector circuit final stage.

The AGC (Automatic Gain Control) receivesan

AGC voltage from the output of the detector cir-

cuit, and applies it to the RF amplifier and IF

amplifier stages.The advantage

of the HA1197 isa

large

reduction in the distortion at low frequencies.

Whereas

the distortion at 100H2 was 1.57oin the

previous HA1138, this figure has beenreduced to

0.4Vo

(LOOHz)

in the HA1197.

TX-s|E'clcltr

5.2 FMTUNER

FM Front-end

The FM front end is composedof a tuning circuit

employing a 5-gangvariable

capacitor,a 2-stageRF

amplifier a mixer employing dual gateMOS FETs,

and a local oscillator with buffer. An equiva-

lent of a cascode amplifier is produced by AC

grounding gate-2 of the dual gate MOS FET,

allowing stable RF amplification at high gain.

The output signal of the RF amplifier is applied to

gate-l of the mixer stage

MOS FET, while the local

oscillator output signal is applied to gate-2. This

technique minimizes input power from the local

oscillator,resultingin low mutual interferenceeven

if the receivedsignalinput level is high.

A variation of a Clapp circuit forms the local

oscillator. Inclusion of a buffer amplifier between

local oscillator and mixer reduceslocal oscillator

load, eliminating distortion of the oscillation wave-

form. Drawing effect of the local oscillator is also

eliminated.

AF out

Fig.

1 Blockdiagram

of HAl197

2nd RFamp

FM75O UNBAL.

3OOOBAL.

Ceramicfilter

ANT

ToSIGNAL Meter

AGC line

1stRF

amp.

Localoscillator

Fig.

2 Circuitof FMfront

end

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