Pioneer TX-600 User manual

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AM / FM STEREO TUNER
TX-600
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1 . SPECIFICATIONS
SEMICONDUCTORS
FET 1
lcs 2
Transistors ...'........'.......'... 16
Diodes ...... 19
FM TUNER SECTION
Frequency Range 87.5MHz to 108MHz {FW, FVZW)
88MHz to 108MHz (KUW)
Usable Sensitivity (l H F ) 2.2 pV
Capture Ratio (lHF) 3 dB
Selectivity (lH F) More than 45 dB
lmage Rejection More than 50 dB (98MHz)
lF Re.lection More than 80 dB (90MHz)
Spurious Rejection More than 70 dB (98MHz)
AM guppression 50 dB
Signal-to-Noise Ratio 70 dB
Harmonic Distortion Mono: Less than 0.6% (100% Mod.)
Stereo: Less than O.8% (1O0% Mod.)
Tuning lndicator Signal strength type and Center Tun-
rng type
Muting Switchable to ON-OFF
Stereo Separation More than 40 dB (1 kHz)
Sub Carrier Suppression More than 35 dB
Noise Filter Switchable to ON-OFF
Output Voltage Controllable, from 80mV 10 2,4V
(100% Mod.)
Antenna I nput 300 (2 balanced
75 (2 unbalanced.
Multipath Terminals Vertical and Horizontal
AM TUNER SECTION
Frequency Range 525k{z to 1,6O5kHz
Usable Sensitivity (lH F) 15 pY
Selectivity (lHF) More than 22 dB
lmage Rejection More than 45 dB (1,000kH2)
lF Rejection More than 35 dB
Signal-to-Noise More than 50 dB
Output Voltag, Controllable, from 80mV to 2,4V
(100% Mod.)
Antenna Built-in Ferrite-Loopstic Antenna
AUDIO SECTION
Recording Output/lmpedance 750mV/3.6kf2 (FM 100% Mod.)
Level Control AM and FM

TX-Ei00
MISCELLANEOUS
Power Requirements
Power Consumption
Weight without package
with package
Furnished Accessories
110V, 12OV, 130V, 22OV and 240V.
(Sw itc h ab le ) 50-60 H z
25 W (Max)
1 6-1 5116" l43}mm (width)
5-1 1 116" l145mm (height)
13-9 I 1 6" I 345mm (depth )
17 tb. /7.6 ks.
21 lb. /9.6 ks.
FM T-type Antenna
AM Lead Antenna
Polysh ing Cloth"
Pin Plug
Connecting Cord
Operating I nstructions
! Specifications and the design subject to modification without
notice due to improvements
4
2
1

the 19 kHz-pilot signal is picked up by
the T14 which is tuned to 19 kHz, and
becomes a pulsating current.of 38 kHz
after rectified by the diodes D11 and D12
on the secondary side of the T14, and
then applied to the Q11.
Transformer T15i which is tuned to 38 kHz,
is provided to the collector of the Q11,
and the 38 kHz pulsating current is for-
med a cleaned sine wave 38 kHz switching si-
gnal and is applied to the switching circuit.
The transistor Q12 is connected to the
emitter of the Q11, permitting the stereo
indicator lamp to turn on and off. On the
other hand, the Q1g functions as emitter'
follower to the L + R signal or L - R signal,
providing a signal to the switching circuit.
The emitter of the QtO it provided with
sub-boost circuit consisting of C7g and T13
for improving separation. This signal is given
a time division and fed to the low-frequency
amplifier section as a signal for L arid
R channels.
MONO BROADCAST RECEPTION
When a mono broadcast is received, there is
no 19 kHz component in the signal that
has been ratio detected, and thus, the Q11
and Q12 do not function. Therefore, the
stereo indicator lamp does not light, allowing
the signal to pass through the diodes of
the switching circuit and fed to the low-
frequency section. Also, if the selector
switch is set to FM MONO, the primary
side of the T15 is opened disabling the Q11.
Therefore, a switching signal cannot be
formed even if 19 kHz signal is applied,
which passes through the switching circuit.
FM AUTO SWITCHING AND MUTING
SWITCH
When the MUTING switch is set to OFF,
and the selector switch is set to FM MONO,
the primary side of the T15 forms a tank
circuit, making a switching signal of 38 kHz
out of 19 kHz pilot signal and provides
the switching signal to the switching circuit.
If the input level of the stereo signal fed
from the antenna is low, the negative
voltage rectified by the D4 on the secondary
side of the T6 is also low. Thus, the
Q9 is turned on, and the base voltage of
the Q11 connected to the collector circuit
of the QS becomes zero, not allowing
the 38 kHz to be amptified and the stereo
signal is not given a time division and
therefore, the signal is received as a mono
signal. When the MUTING switch is set to
ON, the collector of the Q9 is connected
to the Q1g, and thus, when the input fed
from the antenna is low, the Qo is also
T)c6clcl
turned on, Iowering the base voltage of
the Q16 to turn it OFF, and thus the ratio
detected signal does not appear at the
output terminals.
AM TUNER SECTION
This section consists of four transistors Q7,
QS, QS and Q6. The AM signal fed from
the ferrite loopstick antenna is applied to
the Qg, where the signal is converted to IF of
455 kHz and picked up at the Tg. The
frequency conversion circuit is a separate type
circuit consisting of the QA and QZ for
obtaining more stabilized frequency.
The IF amplification, which is made by the
Qg and Q6, is detected by the D16 on the
secondary side of the T11. The AGC controls
the voltage by applying the detected signal
to the base of the Qg. The diode Dg is
provided to obtain the necessary voltage for
the signal meter, and the D7 and Dg for
guarding against excessive input.
AF UN|T(AWM-O02)
CROSS.TALK CANCEL AMPLI FI ER
SECTION
The output signal from the TUNER UNIT
(AM signal, FM mono/stereo signals), which
is selected by the SELECTOR switch S1,
is applied to the AF UNIT. The output voltage
of the TUNER UNIT is amplified up to
a predetermined level by the QS (Qa) and
QS (QO). The QS and Q4 function as a
differential amplifier for FM stereo signal,
and the separation is excellent with cross
talk cancelled by means of the separation
control volume (VRl). The Q5 (Q6) is an
emitter-follower, assuring a low output
impedance without receiving interference from
shielded wires.
The output signal from AM UNIT is connected
to the output terminals after passing through
the level controls for AM and FM, and the
selector switch. The output signal of the
AF UNIT, divided by the resistorg is provided
to the TAPE REC .terminals.
POWER SUPPLY SECTION
The power supply is rectified by the D2 and
D3, and the DC is supplied to the low-frequency
section through the ripple filter of ihe Q2,
and the TUNER UNIT through the stabilizing
unit consisting of the Q1 and D1. Thus,
a better S N ratio and stabilization is a^ssured.

3.DISASSEMBLY
3-1 REMOVE THE TOP COVER
Remove the two screws from each side of the
cover. Move the cover backward a little, and
pull the cover up (Photo 1).
3-2. REMOVE THE BOTTOM COVER
Remove the ten screws from the bottom plate.
The bottom plate will now come off (Photo 2).
3-3. REMOVE THE FRONT PANEL
Pull all the control and switches knobs off
from the shafts. Remove the nuts and washers
from the shafts of the POWER switch,
SELECTOR switch and TUNING knob. The
front panel will now come off (Photo 3 ). Photo 1
Photo 2
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4.DIAL CORD STRINGING
1. Set the AM/FM tuning capacitor at the
minimum.
2. Tie the string to the spring of the pulley @
Wind the string one and a half turns around
the pulley @ before extending the string in
the direction @.
3. Turn tEr string in the direction O at the
pulley @ and hooli it onto the arm C of
the dial pointer. Extend the string in the
direction @ after turning it at the pulleys
@ [email protected]
4. Hook the string on the pulley @. Wind
the string two turns around the dial shaft
@ and tring it up to the pulley @.
5. T\rrn th_e string in the direction @ at the
pulley @, and bring the string up to the
pulley @.
6. T\rrn the string in the direction @ at the
pulley @ and wind it one and a half turns
around the pulley @ in the direction @
and @. Tie the string to the spring as shown
by O.
7. After the string has been arranged by the
above steps, apply a little'amount of lacquer
or paint on the arm @ and on the point @
where the string has been tied to the spring.
Trc6OO
2 TURNS
DIAL SHAFT Ass'y
DIAL POINTOR
VARIABLE CAPACITOR
Fis. 1

(h)
(i)
5. ALIGNMENTS
Complete the alignments in the following orders:
1. FM IF alignment
2. AM IF alignment
3. FM tracking aligrrment
4. AM tracking alignment
5. FM MPX decoder circuit alignment
5-1. FM IF ALIGNMENT
(a) Connect a capacitor 0.01p F between
TPf and ground before the alignmnet.
(b) Connect a resistor 220k Q"in series with
the vertical input terminals of the
oscilloscope (Fig. 2).
(c) Remove the capacitor (4.7 UF ) from the
terminal @ before the alignment(Fig. 2).
(d) Turn the selector switch to FM MONO.
(e) Turn the tuning knob to the right and set
dial at high end of scale.
(f ) Connect the output leads of sweep
generator to the FM antenna terminals.
(Fig. 2 ).
(g) Connect the vertical input of oscilloscope
to the FM meter output terminal @ ,
when connecting to the FM meter
terminal, disconnect the meter lead, then
terminate 4.7k Q between the terminal
@ and ground.
Set the output level of sweep generator
to 60 dB.
Adjust the FM IFT cores (T+, Tb, TO)
as shown in Fig. Z.
Note: When it is difficult to get synchronism
of oscilloscope, make eonnection
between the oscilloscope and sweep
generator for easy synchronism refer-
ing to the operating instructions.
8
(j ) Set the output level of sweep generator
to 100 dB, then keep the top of the
pattern flat and check the tuning eenter
frequency does not move when feed the
high level input (100 dB) to FM antenna
terminal, if it is moved, repeat the
steps ( tr ) to ( i ).
(k) Disconnect the vertical input of oscillo-
scope from the FM meter output terminal,
then eonnect the vertical input leads of
oscilloscope to TPt ( FIg. 4).
(l) Adjust the S-curve pattern for adjusting
the cores of the FM IFT T7. (Linearity is
improved by primary core: symmetry by
the secondary core) (Fig. 4).
(m) Disconnect the capacitor 0.001pF from
the TPf after the alignments has been
completed.
(n) Connect the capacitor @.7 pF ) to the
terminal @ after the alignment has been
completed.
ADJUSTING POINTS
OSCILLOSCOPE PATTE R N
ANTE NNA TE R M INALS
DUMMY ANTEN NA
oo o o
SWEEP G EN E RATO R
Fig. 2

5-2. AM IF ALIGNMENT
(a) T\rrn the selector switch to AM.
(b) Connect the output leads of the sweep
generator to AM antenna terminals.
(c) connect the input leads of the oscillo-
scope to the AM detector output
terminal @.
osc
ADJUSTING POINTS
WHEN ADJUSTING THE S.CURVE, REMOVE THE
CAPAcIToR c41(q.I p p). AFTER ADJUSTING
s- cuRvE, coNNEcr rHE cApActroR c41 ( 4.T,tt p)
T)c6cIcI
Set the output level of the sweep
generator to 40 dB.
Adjust the AM IFT eores (Tg, T10, Ttt)
as shown in Fig. g.
Make the pattern symmetrical with
respect to the center, coinciding with
the peak of the pattern to the oscilloscope
pattern.
LIN EAR ITY Fig. 3
S-CURVE
PATTE R N
SYMM ETRY
Fig. 4
9
(d)
(e)
ANTENNA TERMINALS
DUMMY ANTEN NA
SWEEP GENERATOR
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ANTENNA TERMINALS
DUMMY ANTEN NA
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SWEEP GENERATOR

5-3. FM TRACKING ALIGNMENT
(a) T\rrn the selector switch to T'M.
(b) Connect the output leads of sweep
generator to the FM antenna terminals.
(c) Connect the vertical input leads of oscillo-
scope to the TAPE REC terminal @.
(d) Set the output level of sweep generator to
modulation 400 Hz, L}OVo and level
15 dB, the frequency set to 9 0 MHz
under the test equipment's dial set at
90 MHz.
(e) Connect the V.T.V.M. and oscilloscope
to the TAPE REC terminals.
( f ) Observing the ou tpu t level on the
V.T.V.M. and adjust the following cores
to get maximum reading on the meter.
T3 ..... Oscillatorcircuit
T1 Antenna coil circuit
T2 RF circuit
(g) Set the frequency of the FM signal
generator and dial pointer of equipment
to 106 MHz.
(h) Follow the steps below to adjust the
adjusting points:
Tlimmer capacitor CTg: Oscillator circuit
Tlimmer capacitor CTf : Antenna circuit
Trimmer capacitor CTZ: RF circuit
(f) Repeat the steps ( f ) to ( h ) several
times.
( j ) After the alignment, lock the trimmer
* capacitor with paint.
ADJUSTING POINTS
ADJUSTING
5-4. CHECKING MUTING
FUNCTION
(a) Connect the output leads of FM signal
generator to the FM antenna terminals.
(b) Connect the vertical input leads of
oscilloscope to the TAPE REC terminals.
(c) Set the output level of FM signal
generator to 16 dB and turn the muting
switch or, then check the muting
function on the scope. The muting
function is designed to the function at
about 16 dB input.
o
TAPE REC
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POINTS
v.T.v.M.
REAR PANEL I I
DUMMY ANTENNA I I
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GENERATOR
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Fig. 5

(a)
(b)
5-5. AM TRACKING ALIGNMENT
Turn the selector switch to AM.
Connect the AM signal generator to the
AM antenna terminals (Fig.6).
Set the condition of the AM signal
generator to the modulation 400 Hz,
307o and output level 30 dB, then
freque.ncy is 600 kHz under the test
equipment's dial set at 600 kHz.
(d) Connect the V.T.V.M. and oscilloscope
to the TAPE REC terminals.
(e) Observing the output level on the
V,T.V.M. and adjust the following eore
to get murimum reading on the meter.
Tg .. .... . o .. Oscillatorcircuit
Ferrite loopstick antenna: Antenna circuit
(f ) Set the condition of the AM signal
generator and turning knob to L400 kHz.
(g) Observing the output level on the
V.T.V.M. and adjust the following core
to get murimum reading on the meter.
CTf . o . ... o.. .. Oscillatorcircuit
CT+. . . . . . . . . . . . Antenna circuit
(h) Repeatthealignments(e)to(g)
several times.
(i) After the alignments, lock the trimmer
capacitor with paint.
(i ) 'As this result, the signal meter should
indicate maximum.
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F E R R ITE LOOPSTICK ANTEN NA
DUMMY ANTENNA
oo
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FM SIGNAL GENERATOR
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(c)
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V.T.V.M.
ANTENNA TERMINALS
ADJUSTING POINTS
Fig. 6

5-6. MPX DECODER ALIGNMENT
(a) Modulate the FM signal generator output
by FM stereo MPX modulator.
(b) Turn the selector switch to FM AUTO.
(c) Connect the FM sigrtal generator to the
FM antenna terminals.
(d) Set the condition of the FM stereo MPX
modulator to modulation: main 1 kHz
(L + R) 6OVo, pilot 8 tUVo.
(e) Set the output level of the FM signal
generator to 60 dB.
(f ) T\rrn the tuning knob to maximum
reading on the signal meter.
(g) Set the modulation of the FM stereo
MPX modulator to pilot only.
(h) Connect the oscilloscope to TP2.
(i) Adjust the transformers (T13, T!4, Tf f)
until the output level of the 19 kHz
becomes maximum on the scope.
(j ) Set the condition of the FM stereo
MPX modulator to the pilot with L or
R signal.
(k) Connect the dual-trace oseilloscope and
V.T.V.M. to the TAPE REC terminals.
(l) Adjust the semi-fixed potentiometer on
the AF printed circuit board until the
output level of the L or R signal becomes
maximum on the scope.
OSCILLOSCOPE ADJUSTING POINT
5-7. CHECKING SCA FILTER
(a) Connect the FM signal generator to the
FM antenna terrninals.
(b) Turn the selector switch to FM AUTO.
(c) IVlodulate the FM signal generator con-
nected to the audio generator, check
the frequency responsce for the deep
dips at around 67 k}Jz and 7 2 kHz in
the frequency response.
5-8. CHECKING STEREO
INDICATOR
(a) Connect the FM signal generator to the
FM antenna terminals.
(b) Turn the selector switch to FM AUTO.
(c) Modulate the FM signal generator con-
nected to the FM stereo MPX modulater,
and set the FM stereo MPX modulator
pilot oh, and check the stereo.indicator
lamp for lights, set the FM stereo MPX
modulator to pilot off, and check the
stereo indicator lamp for goes out.
ANTENNA TERMINALS
REAR PANEL
DUAL TRACE MPX STEREO
OSCILLOSCOPE MODU LATOR FM SIGNAL
GEN E RATO R
19 kHz CARRlER
OUTPUT PATTE RN
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TAPE REC DUMMY
ANTENNA
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7. UNPACKING AND PARTS NUMBER
STYROTECTOR
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