Pioneer SX-1010 User manual

(ART-O43-
SERVICE MANUAL
STEREO RECEIVER
ex -1010
KCU, F, GN
NOTE:
MODEL SX-I0I0 COMES IN THREE VERSIONS DISTINGUISHED AS FOLLOWS:
Round label on Voltage Type
rear panel
KCU 120V only UL (U. ) and CSA (Canada) approved.
llOV, 120V, 130V General export model.
220V and 240V
(Switchable)
220V only SEMCO (Sweden), NEMCO (Norway),
DEMCO (Denmark) approved.
(74BO2M61 D) C,D PIONEER~

8X-1C10
CONTENTS
About 220V only model labeled "GNu
This model whose rear panel is labeled "GNu circular mark operates only on 220V
substantially in its circuit design from two other models. When repairing this model
please see the manual on page 75 and the followings which include such items as Circuit
connection diagram, Miscellaneous parts list, Schematic diagram of power supply circuit
assembly, P.C. board pattern and its parts list.
Before servicing, also please do not fail to check to see if the "GN" mark is labeled on the
rear panel.
SPECIFICATIONS...............................................
FRONT PANEL FACILITIES .................,.................... 5
CONNECTION DIAGRAM ..........................,............. 7
BLOCK DIAGRAM.......................................... ....
CIRCUIT DESCRIPTION .........................................
DIAL CORD STRINGING..................................... ....
DISASSEMBLY .................................................
PARTSANDP. BOARDLOCATIONS............................. 14
LEVEL DIAGRAM..................... .........................
ALIGNMENT PROCEDURE
10. 1 English...................................................
10. Abgleichverfahren ..........................................
EXPLODEDVIEWANDPARTSUST............................... 20
SCHEMATIC DIAGRAMS, P. C. BOARD PATTERNS AND
PARTS LIST
12. Circuit Connection Diagram and Miscellaneous Parts.
. . . . . . . . . . . . ..
12.2 FM Front End (AWB-017).................................... 32
12.3 Tuner Assembly (AWE-040)................................... 33
12.4 Muting Circuit Assembly (AWM-O39)........................ ....
12. Equalizer Amplifier Assembly (AWF-013) . . . . . . . . . . . . . . . . . . . . . . ..
12.6 Control AmplifierAssembly(AWG-O27)..................... ....
12.7 Power Amplifier Assembly (AWH-O32) .. . . . . . . . . . . . . . . . . . . . . . . ..
12. Protection Circuit Assembly (AWM-062) . . . . . . . . . . . . . . . . . . . . . . . ..
12.9 Power Supply Circuit Assembly (AWR-053) .. . . .
. . . . . . . . . . . . . . . ..
12. 10 Power Supply Circuit Assembly (AWR-O54) . . . . . . . . . . . . . . . . . . . . ..
12. 11 Switch Circuit Assembly (AWS-064) ............................
12. 12 Switch Circuit Assembly (AWS-068) ............................
12. 13 Switch Circuit Assembly (AWS-069) ............................
12.14 Switch Circuit Assembly (AWS-070) ............................
12.15 Switch Circuit Assembly (AWS-071) ............................
12. 16 Switch Circuit Assembly (AWS-O72) ............................
12. 17 5PConnectorAssembly(AWX-062) ............................
PACKiNG METHOD AND PART NUMBERS .......................... 71
SCHEMATIC DiAGRAMS, P.C. BOARD PATTERNS AND
PARTS LIST FOR 220V ONLY MODEL
14. 1 Circuit Connection Diagram and Miscellaneous Parts. . . . . . . . . . . . . . . .. 75
14.2 Power Supply Circuit Assembly (AWR-063) . . . . . . . . . . . . . . . . . . . . . ..
10.
11.
12.
13.
14.

1 " SPECI FI CATIONS
SEM!CONDUCTORS
EETs ...................................................... 3
ICs ......................................................... 5
Transistors ............................................. 73
Diodes ................................................... 41
AMPLIFIER SECTION
Continuous Power Output
20Hz~20kHz
(Both channels driven) .................. WOW + 100W (8,Q), W5W + 105W (4,Q)
1kHz (Both channels driven) ......... 110W + 110W (S,Q), 110W + 110W (4,Q)
Harmonic Distortion
(20Hz~20kHz Continuous
Power Output) .............................. Less than 0.
(IW + 1W, Power Output) ............ Less than 0.05%
I ntermodulation Distortion
(Continuous Power Output) ......... Less than 0.
(IW + 1W, Power Output) ............ Less than 0.05%
Power Bandwidth
(I H F, Both channels driven) ......... 5Hz~40kHz (T. D. 0. 1%)
Frequency Response ........................... 7Hz~100kHz
I nput Sensitivity/I mpedance
POVlfER AMP IN ........................... 1V/50k,Q
Output
Speaker ............................................. A, B, C, A + B, A + C, B + C (4,Q~16,Q)
Headphone
....................................
4,Q~16,Q
Damping Factor
(1 kHz 8,Q) .................................... More than 50
Hum & Noise
(IHF, short-circuited
A Network) .................................... More than 100dB
Residual Hum & Noise
(S,Q, Pre & Power amplifier) ......... Less than 1 mV
PR IEAMPLI FI E R SECTION
Input Sensitivity/I mpedance
PHONO 1 ....................................... 2.5mV /50k,Q
PHONO 2 ....................................... 2.5mV/50k,Q
PHONO Overload Level
(rms/p-
p) .................................."...
MIC
................................................
AUX
................................................
TAPEPB1
.................................
TAPE PB 2 (D I N connector)
.........
Output Level/I mpedance
TAPEREC1
..............................
TAPE REC 2 (DIN connector) ......
PRE OUT
.......................................
250mV!700mV
0mV /50k,Q
150mV/70kD
150m V /70k,Q
150mV!70k,Q
150mV
30m V /80k,Q
1V/1k,Q
Harmonic Distortion
(20Hz~20kHz) .............................. Less than 0.

SX-1 01 0
:!:10dB (10kHz)
:!:5dB (20kHz)
AM SECTION
Sensitivity
(I H F, Ferrite antena)
(IHF, Ext. antenna)
Selectivity................
Signal-to-Noise Ratio
I mage Rejection
I F Rejection
MISCELLANEOUS
Power Requirements
300l1V /m
1511V
40dB
50dB
65dB
85dB
Frequency Response
PHONO (RIAA equalization).........
AUX, TAPE PB
Tone Control
BASS:
MAIN
SUB
TREBLE:
MAIN
SUB
Filter
LOW CUT
HIGH CUT
Loudness Contour
(Volume control set at
40dB position)
.....
Hum & Noise
(IHF, short-circuited
A Network)
PHONO
MIC .....
AUX, TAPE PB
Muting
...............
FM SECTION
Usable Sensitivity (I H F)
Capture Ratio (IHF)
Selectivity (IHF)
...
Signal-to-Noise Ratio
Image Rejection (98MHz)
I F Rejection (98MHz)
Spurious Rejection
AM Suppression ......
Harmonic Distortion:
30Hz~15kHz :!:O.3dB
10Hz~40kH(~ dB
:!:10dB (100Hz)
:!:5dB (50Hz)
Dimensions
AC 120V 60Hz or 110, 120, 130 220 and 240V
(switchable) 50/60Hz
400W (UL approved model only)
640W (5 line Voltage model only)
520 (W) x 175 (H) x 440 (D) mm
20- 1/2 x 6-7/8 x 17-5/16 in.
8dB (50Hz) 6dB/oct.
9dB (10kHz) 6dB/oct. Power Consumption
+8dB (100Hz), +4dB (10kHz) Weight:
Without Package
With Package
FURNISHED PARTS
FM T-type Antenna
Operating Instructions
Fuse 6A
Fuse 3A
22.2 kg (48 Ib 13 oz)
26.6 kg (58 Ib 8 oz)
More than 70dB
More than 65dB
More than 95dB
20dB ~ (5-line voltage model only)
1.711V
0dB
90dB
72dB
110dB
110dB
11 Od B
55dB
NOTE:
Specifications and the design subject to possible modification without notice due to improvements.
MONO
STEREO
Frequency Response
Less than 0.
Less than 0.
20Hz~15kHz~g:6 dB
50Hz~10kHz~g:g dB
Stereo Separation
1kHz
...........
50Hz~10kHz
Sub Carrier Suppression
Antenna Input
Muting
More than 40dB
More than 30dB
65dB
300,Q Balanced 75,Q Unbalanced
ON-OFF

FRONT PANEL FACiliTIES
FRONT PANEL FACILITIES
SPEAKER BUTTONS
Each of speaker systems A, B, and C is connected to each
of output terminals A, B, and C.
By pushing the following:
SPKR-A .... Speaker systems A into operation
SPKR-B .... Speaker systems B into operation
SPKR-C .... Speaker systems C into operation
NOTES:
1. Whenanytwopairsofthebuttons(A+B B+C C+A)are
depressed, the corresponding
pairs of speaker systems ;"iIl
come into operation. However, operating all three button"
even though depressed at the same time is not possible.
2. Only when listening through headphones, press again the
SPKR button(s) in us" to OFF (undepressed) from the ON
position (pressed).
POWER SWITCH
Turn this switch ON but wait for some 3 to 6 seconds
during the silence of which the protection circuit elimi-
nates the unpleasant noise not imputed to a receiver fault.
PHONES (1 , 2) OUTPUT JACKS
Accept two pairs of headphones.
BASS CONTROLS
Adjust bass tone quality.
100Hz. . .. For the low frequencies below 400Hz.
Possible up to lOdB of increasing or
reducing at 100Hz in 2dB steps.
50Hz. . . . . . After adjustment by the 100Hz control
further adjust frequencies below 80Hz by
this control, if necessary. Possible up to
5dB of increasing or reducing in bass
response at 50Hz in 2.5dB steps.
LOW CUT, HIGH CUT BUTTONS
LOW. When the low-pitched rumble (turntable
motor or other source) is obtrusive, de-
press the LOW CUT button to ON. In no
interference, leave it undepressed (OFF).
When the high frequency scratch noise
(records or other source) is much, depress
this button to ON. In no interference
leave it undepressed (OFF).
HIGH
TONE SWITCH
When in the ON (up) position, this switch causes the
amplifier section to operate with a flat frequency regard-
less of the tone control settings. Use this switch to check
the audio characteristics of your listening room such as
when it is necessary to check the tone quality of phono
cartridges and speakers and also to particularly set the
tone controls to be assessed.
SIGNAL METER FM TUNING METER
While getting the SIGNAL meter needle going to the right
make fine adjustment with the FM TUNING meter whose
needle comes to the center (indicating the optimum
reception).
For AM and FM station tunings
AM tuning: Tune the dial pointer so that the SIGNAL
meter needle comes to the extreme right.
Both the SIGNAL and FM TUNING
meters work together. The optimum
point of the SIGNAL meter needle is the
same as in AM tuning. Then use the FM
TUNING meter.
FM tuning:
-FM STEREO INDICATOR
TUNING KNOB
.,~..
"'"'0 """"'" -do. ". .0'0
AUDIO MUTING BUTTON -20dB
Depress this button to mute the audio input to -20dB.
No need to turn down the VOLUME control on each
BALANCE CONTROL
Adjusts the balance between the sound volume from the
left and right speaker systems.
occasion for your convenience. DOLBY NR ADAPTOR SWITCH
When employing Dolby Noise Reduction Adaptor, depress
this DOLBY NR ADAPTOR to ON.
TREBLE CONTROLS
Adjust treble tone quality.
10KHz .. For the high frequencies above 2. 5kHz.
Possible up to 10dB of increasing or
reducing in treble response at 10kHz in
2d B steps.
.. After adjustment by the 10KHz control
further adjust frequencies above 12KHz
by this control, if necessary. Possible up
to 5dB of increasing or reducing in treble
response at 20kHz in 2.5dB steps.
20KHz
4CH ADAPTOR SWITCH
When using the 4-channel rear amplifier connected to the
4CH jacks on the rear panel, depress this 4CH ADAPTOR
to ON.
TAPE MONITOR (1 2) SWITCHES
Monitor the recorded sound while recording with a tape
deck. Also possible to play back tapes as follows:
1 . . . With a tape deck connected to the TAPE
1 jacks (REC and PB), either monitoring
of recording in progress or playing back is
possible.
. .. With a tape deck connected to the TAPE
2 jacks (REC and PB or REC/PB con-
nector), the same as in 1 above is possi-
ble.
TAPE DUPLICATE SWITCH
Leave this switch in the ON (down) position to duplicate
or edit a recorded tape using two tape decks. For normal
use, switch over to the OFF (up) position.
FUNCTION SELECTOR BUTTONS
For selecting the program source, push each button as
follows:
AM..
. . . ..
For AM broadcast reception.
For FM broadcast reception. The
STEREO indicator lights up when the
broadcast is in stereo.
PHONO 1 .. For operating a turntable connected to
the PHONO 1 input jacks.
For operating a turntable connected to
the PHONO 2 input jacks.
. . ..
For using a microphone. Not possible to
mix with other program source.
For listening to audio equipment (car-
tridge tape player, TV sound tuner, etc.
connected to the ALJX input jacks.
PHONO 2
MIC
AUX
DIMMER SWITCH
Dims the brightness of the indicator light. Press again to
restore full brightness.
FM MUTING BUTTON
Leave this button undepressed (in the ON position) while
tuning in FM stations. Inter-station noise may interfere
with FM reception while tuning between stations. To
suppress this noise, leave the MUTING button undepress-
ed (in the ON position). If the low signal strength is due
to distance from the transmitter or other influences
depress this button , at which the weak station will be
heard with the MUTING "OFF.
MODE BUTTON
Leave this button undepressed (if necessary, depress this
to release it when already depressed) for STEREO
playback. For MONO playback, depress it. In this case
stereo signals for left and right channels will be mixed into
mono signal which will be heard from the center of both
speaker systems.
LOUDNESS BUTTON
Depress this button to listen at low volume. The human
ear s frequency response varies according to the listening
volume. The depressed button compensates for hearing
response with emphasis on the bass and treble.
MIC INPUT JACKS
, R . . . .. For connecting the left and right channel
microphones.
NOTE:
Use the high impedance (above 20M2) with 6mm diam. phone
plug,.
VOLUME CONTROL
Governs both the volume of sound outputs from the
speaker systems and from the headphones.

CONNECTION DIAGRAM
OUTDOOR
FM ANTENNA
GROUND
TYPE FM
ANTENNA
300n feeder
75n :
coaxial:
cable
(;)
FM DE-EMPHASIS SWITCH
I n some countries. the receiver
is delivered with a selector switch
for adjusting the FM de-emphasis
from 50 to 75!lsec. If your unit
is equipped with such a switch
on the rear panel , and if the high
sound range gives an impression
of weakness move the de-em-
phasis switch to its other posi-
tion.
ANTENNA CARTRIDGE
TAPE PLAYER
TURNTABLE TURNTABLE
(!)
For connecting
4-channel discrete
FM broadcast adaptor
For connecting
Dolby NR
adaptor
For connecting
channel adaptor
PRE/POWER AMP
The bridge/connecting plugs
between PRE OUT and POWER
I N jacks should always be left in
position in normal use. If they
are disconnected or removed, no
sound will come from the speak-
ers.
Always be sure to cut the power
supply before attempting to re-
move them.
TAPE DECK
(open-reel, cassette) TAPE DECK
LINE
INPUT LINE
OUTPUT LINE
INPUT LINE OUTPUT
Playback/Recording Cord (DIN-type)
FUSE
- R CH L CH R CH L CH R CH (C) L
(A) (B)
SPEAKER SYSTEMS
SX-1 01 0

BLOCK DIAGRAM
4 CH MPX OUT
(C?)
':~~CED
FM
,?,,'
L".-i1CED
S19
MUTiNG
SWiTCH
SIQ
or:-'
r- co
::0 "" 2
0 -
a::a::
iDh:
~6~-'
::00 2
0 -
CO r-
a:: CL.
CL.
r "",
CO r-
a:: CL.
AUX
S'0a S11 a
or:
:r:
MIC
MIC
PHONO 2 (0 ' Sl1b
, 0--
~ ~
AUX
SWITCHES'
S 1 FUNCTION
S 2
S 3
S 4
S 5
SlO
SI1
S,Z
a:: - CL.
L w.J
CL.
Sa:: 2
0 ~-
L 8-!
:r:
r- 2
::0 -
'C ~gj-!
';)h:
i'cl co
a:: N CL.
L w..J
CL.
PHONO 1
PHONO 2
MIC
AUX
DUPUCATE
TAPE MONITOR 1
TAPE MONITOR 2
4 CH ADAPTOR
DOLBY NR ADAPTOR
MODE
S i1 LOUDNESS
S 14 TONE DEFEAT
S15 LOW FILTER
S 16 HIGH fILTER
S 17 AUDIO MUTING
S 18 DIMMER
S 19 FM MUTING
S 20 SPEAKER A
S"
S22
S 23 POWER
l) ~~L Stabilizer
to Tuner
AF section
S18
~" --" "
::rll""
J~~~""'
'-----v----'
to Power amplifier
Stabilizer d:c Regurator
S'40
-Q-Q-

CIRCUIT DESCRIPTION
SIGNAL PATH
1. The FM broadcast signal waveform from the
antenna is fed to the two dual-gate MOS
field-effect transistors in the front end for
radio frequency amplification. This signal is
converted into an intermediate frequency by
the dual-gate MOS FET mixer stage in com-
bination with the signal from the local oscil-
lator.
2. The intermediate frequency signal, con-
verted within the front end, is fed to four
ceramic filters and three ICs, where it is
tuned, amplified, and detected , becoming a
audio frequency (composite) signal.
The composite signal following detection is
fed to the 4 CH MPX terminal jack and the
multiplex decoder stage.
3. The multiplex decoder stage uses one IC for
three functions: to demodulate the com-
posite signal into the left and right channel
stereo signals, to operate the automatic
mode switching between stereo/mono, and
to switch the stereo indicator lamp appro-
priately.
The decoding system uses a phase locked
loop (PLL) circuit, which assures continuous
stable operation and excellent stereo sepa-
ration with low susceptibility to external
noise (such as car ignition noise) and
ambient temperature changes.
After decoding, the signal is fed to four
transistors and one LC filter, where the
residual carrier component (38kHz, 19kHz
and SCA) is rejected, and then to the audio
amplifier section.
4. The FM muting circuit consists effectively of
two circuits, designed to reduce the pulse
noise which can so easily arise when a
muting circuit is operative.
The one circuit is an electronic switch in-
corporated into the IC, so that the de-
modulated circuit is switched off and on in
the IC, and the other short-circuits the audio
signal by means of a reed relay.
5. The AM tuner section employs one mono-
lithic IC which functions as radio frequency
amplifier, frequency converter, local oscil-
lator, intermediate frequency amplifier, and
detector. The output is a pure audio signal.
6. The signals which are applied to the MIC and
PHONO terminal jacks are selected by the
FUNCTION switch before being fed to the
first stage of the three-stage differential
direct-coupled equalizer amplifier by which
the signals are amplified.
In order to reduce the switch noise, the
circuit configuration employed enables the
potential at the input and output terminals
to be set at near zero volts.
SX-1 01 0
It incorporates an independent differential
circuit in the first stage of the equalizer
amplifier whose DC supply uses twin plus
and minus.
7. The output from the equalizer amplifier
together with that from the AUX terminal
jacks, the audio signal from the AM tuner
and the audio signal from the FM tuner, are
all selected by the FUNCTION switch, and
pass through the switch circuits for TAPE
DUPLICATE, TAPE MONITOR, 4 CH
ADAPTOR DOLBY NR ADAPTOR, and
the circuits for BALANCE and VOLUME
controls, before being fed to the control
amplifier.
8. The control amplifier has an extremely high
input impedance, using PNP and NPN tran-
sistors in a direct-coupled two-stage circuit.
This greatly reduces the influence of the
performance inherent in equipment con-
nected externally.
The output from this two-stage direct-
coupled circuit is divided into two circuit
systems.
One goes to the TONE switch via the twin
tone control circuit, and the other goes
directly and unmodified in any way .to the
TONE switch. The TONE switch selects
between them.
9. The amplifier section of the twin control has
closed loop NFB amplifiers for both the
main and sub circuits, each of which has its
own transistor, eliminating mutual inter-
ference.
10. The control amplifier output is fed to the
power amplifier after passing through the
LOW FILTER, HIGH FILTER and AUDIO
MUTING circuits.
The first stage of the power amplifier is a
differential amplifier element with constant
current load, and the second stage , too, uses
a differential amplifier element, so that DC
potential drift is prevented.
On the other hand, the final output stage
uses two power transistors in parallel in both
the upper and lower circuits, so that large
collector dissipation is possible.
Again, in order to reduce the distortion
which occurs at low signal levels, the idle
current has been set at a standard level of
100mA.
11. The power amplifier output is fed to the
three push buttons which form the
SPEAKER switch. This selects A, B, and C
speaker system terminal connection.
If all three speaker systems were to
connected simultaneously, the effective
speaker impedance might be less than 4il.
To guard against this possibility, when all
three buttons are depressed together, all
three systems are disconnected from the
amplifier.
12. The power amplifier circuit board includes a

power limiter circuit which is independent
of the signal circuit. If the power transistor
current exceeds the maximum rated value
the power limiter circuit shorts the input
signal to protect the power transistors.
The 'sensing' for this protective circuit is
performed by detecting the voltage drop
across the emitter resistors of the power
transistors. There are also protective circuit
which guard against DC potentials at the
power amplifier output junctions, against
speaker complex load impedances less than
, and shorts across the speaker terminals.
Their operation is such that, under the cor-
responding abnormal condition, a relay acts
to separate the output junction and the
output circuit. Further, these protective
circuits also help to mute the unwanted
signal which immediately follows switching
the POWER switch ON, and to immediately
disconnect the output after switched OFF.
DIAL CORD STRINGING
1. Turn the tuning capacitor so that its plates
protrude as much as possible.
2. Tie one end of the string to the spring on the
TUNING pulley (attached to the tuning
capacitor ).
3. Lead the string around pulley A, then wind
it three turns around the TUNING shaft.
4. Lead the string around pulleys B, C and D
then wind it 1-1/2 turns around the TUN-
ING pulley.
5. Now tie the other end of the string to the
spring on the TUNING pulley. Turn the
TUNING shaft and check for proper func-
tion. Then trim the ends of the string.
6. Turn the TUNING shaft until the plates of
the variable are all the way in. Move the
pointer to the left-end starting point on the
dial and fasten it to the string in that
position.
PULLEY D
TUNING PULLEY
DIAL POINTER

SX-1 01
DISASSEMBLY
1. To remove the wooden cabinet, first remove
the two screws holding each side, then lift
the back of the wooden cabinet upward.
2. Pull off all knobs.
3. Remove the two screws in the upper edge of
the front panel and remove two nuts and
washers. Then pull the panel gently forward.
4. To remove the bottom plate, first remove
the ten screws holding it in place.
WOODEN
CABINET
~~p~~
~i'
~%-~"'"
FRONT PANEL
~" '0
I%~"
"""
" 0 0 ~
~~~~~M
""' '""~ ~
~ o:~o
4 0
. g
1 ~

PARTS AND P. C. BOARD LOCATIONS
TOP VI EW
KNOB (POWER, TONE , DUPLICATE
MONITOR, 4 CH ADAPTOR, NR ADAPTOR)
AA D-040-
FRONT PANEL ASSEMBLY
ANB-255-
TUNER ASSEMBLY
AWE-040-
RELAY
ASR-002-
C3)
C3)
TUNING
PU LLEY
ASSEMBL Y
TUNING SHAFT AXA-015-
ASSEMBL Y
AXA-056-
KNOB (TUNING)
AAA-026- FM FRONT END AWB-017-
PHONO JACK-B (6 JACKS)
AKB-017-
PHONO JACK-A (4 JACKS)
AKB-014-
ELECTROLYTIC CAPACITOR
000 IlF /63V
ACH-037-
POWER SUPPLY
CIRCUIT ASSEMBLY
AWR-053-
POWER TRANSFORMER
ATT-166-A (KCU)
ATT-174-0 (F)
POWER AMPLIFIER
ASSEMBL Y
AWH-032-
EQUALIZER ANTENNA TERMINAL
AMPLIFIER ASSEMBLY BOARD
AWF-013-0 AKA-002-
MUTING CIRCUIT ASSEMBLY
AWM-039-

BOTTOM VIEW
KNOB (BASS-MAIN , TREBLE-MAIN
VOLUME , BALANCE)
AAB-068-
SWITCH CIRCUIT ASSEMBLY
AWS-072-
SWITCH CIRCUIT ASSEMBLY
AWS-069-
FERRITE LOOPSTICK ANTENNA
ATB-O27-
FERRITE ANTENNA
HOLDER ASSEMBLY
W72-092-
PROTECTION CIRCUIT ASSEMBLY
AWM-062-
0 0
POWER SUPPLY
CIRCUIT ASSEMBLY
AWR-054-
CONTROL AMPLIFIER ASSEMBLY
AWG-027-
LEVER SWITCH (POWER)
ASK-080-0 (KCU)
ASK-081-0 (F)
KNOB (BASS-SUB , TREBLE-SUB)
AA B-069-
ill =
0 ~!
0 I~
OJ CJ
OJ
0 ~~
0 i~
CD
g =
69 0
(g) CJ
FUSE HOLDER
AKR-012-0 (KCU)
AKR-001-0 (F)
AC POWER CORD
ADG-005-
SPEAKE R OUTPUT TE RM I NAL
AKE-O14-

10. ALIGNMENT PROCEDURE
10. ENGLISH
ALIGNING THE FM SECTION
1. SX-1010 Control Settings
Set the controls (knob and switches) of the SX-1010 as follows:
POWER:
FUNCTION: FM
FM MUTING: OFF
2. Connections between Test Equipment and the SX-1010
. The output from an FM signal generator should be connected to the 300Q antenna terminals
of the SX-1010.
. A distortion meter should be connected to the TAPE REC terminal jacks on the SX-I010.
. An AC millivolt meter should be connected to the TAPE REC terminal jacks on the SX-1010
in parallel with the distortion meter.
3. Set both the FM signal generator and the SX-1010 to indicate 98MHz.
4. Turn the FM signal generator output level down to minimum.
5. Turn the lower core and adjust so that the TUNING meter needle is centered.---r
6. Increase the FM signal generator output to 60dB, modulated at 400Hz, with a deviation of :1:75
kHz.
7. Turn the upper core and adjust so that the distortion is at a minimum.
Steps 4 ~ 7 above should be repeated several times in succession, until no significant improve-
ment is obtained.
:~ ~
:~ 8 ~&J " 0" c Ie
" "
aa""a (Z)
(1) c " " 0)" " c c 0 "
8. Set the FM signal generator output level to 10dB, modulated at 400Hz, with a frequency devia-
tion of :1:75 kHz.
9. Adjust for maximum output at 90MHz.
10. Adjust for maximum output at 106MHz.
11. Adjust for maximum output at 90MHz.
12. Adjust for maximum output at 106MHz.
Steps 11 ~ 12 above should be repeated several times in succession, until no further significant
impmvomenti, ob',;ned.
i 0 0
0 &
r $
e,f 1 (
I ~ t
0 0 = 0

ALIGNING THE FM MPX SECTION
Note: This set of adjustments should not be carried out until the alignment of the FM section
(1 ~ 12 above) has been completed.
The multiplex signal generator should be connected to the external modulator terminals
of the FM signal generator.
1. SX-1010 Control Settings
Set the controls (knob and switches) of the SX-1010 as follows:
POWER:
FUNCTION: FM
FM MUTING: OFF
2. Connections between the Test Equipment and the SX-1010
. The output from the FM signal generator should be connected to the 300,Q antenna
terminals of the SX-1010.
. The oscilloscope X plates (horizontal inputs) should be connected to the PILOT OUT
terminals on the MPX signal generator, and the Y plates (vertical inputs) to terminal number
24.
. The AC millivolt meter should be connected to the TAPE REC terminals (with changeover
possible from L to R channels).
3. Multiplex Signal Generator Modulation
L + R (1kHz): 67. 5kHz deviation
PILOT (19kHz): 7.5kHz deviation
4. Set the FM signal generator output to minimum.
5. Adjust for a stationary Lissajous waveform on the oscilloscope.
6. Reset the FM signal generator to 60dB level output, and modulate either the L or R channel.
7. Adjust for the maximum separation.
:~
:~ 8
aocco 0
~ D
a a

SX-1 01 0
ALIGNING THE AM SECTION
1. SX-1010 Control Settings
Set the controls (knob and switch) of the SX-1010 as follows:
POWER:
FUNCTION: AM
2. Connections between Test Equipment and the SX-1010
. Connect the AM signal generator to the AM antenna terminals (in series with a 1k,Q
dummy resistor).
. Connect the AC millivolt meter to the TAPE REC terminal jacks.
3. Set the AM signal generator to 30% modulation at 400Hz.
4. Set the AM signal generator output to 30dB at 600kHz.
Adjust for maximum output (Carry out the ferrite loopstick antenna core adjustment at the
same time).
-5. Adjust for maximum output with the frequency set at 1 400kHz.
Adjustments 4 ~ 5 above should be repeated several times until no further significant improve-
ment is obtained.
. Connect the AM signal generator directly to the AM ANT (antenna) terminals.
7. With a frequency of 1 400kHz and an AM signal generator output of 36dB, adjust for a low
frequency output of 70mV.
8. With an AM signal generator output of 80dB, adjust for a low frequency output of
of 310mV. ",,"c" ~
(0)
" a " CD a
" "
a 0
ALIGNING THE POWER AMPLIFIER SECTION
Note: There are individual circuit boards for the Rand L channels. The following instructions
apply to both channels (boards) and should be carried out for each in turn.
1. Nothing should be connected to the input jacks of the SX-101O, and an 8.\1 dummy resistor
should be connected across the speaker terminals.
2. A DC millivolt meter should be connected across between terminal number 19 and earth.
3. Adjustment should be made to bring the voltage to zero.
4. The DC voltmeter should be connected between terminals number 14 and 16.
5. Adjustment should be made to bring the voltage to 50m

11 . EXPLODED VIEW AND PARTS LIST
NOTE:
Parts number is subject to change for the purpose of improvement
with notice of a service bulletin.
Service bulletin will be furnished whenever necessary and you are
requested to amend parts number in this manual according to the
instructions.
Parts List of Exploded View- NOTICE: Any parts asterisked(* ) are subject to being not supplied.
Key No. Description Part No.
Power transformer ATT-166- KCU
Power transformer ATT-174-
Power transformer ATT- 179-
Sub-chassis AN F-242-
Shield cover ANH-213-
Tuner assembly AWE-O40-
Tuner assembly-held metal AN F-244-
Tuner assembly-held metal AN F-244-
Electrolytic capacitor 18 00011F 63V ACH-037-
Power amplifier assembly AWH-032-
Power supply circuit assembly A\llJR-053- KCU, F
Power supply circuit assembly AWR-063-
Muting circuit assembly AWM-039-
Screw M4X15 ABA-OlO-
Washer B21-011-
Wooden cabinet assembly AMM-034-
14* Heat sink ANH-205-
15* Heat sink-held metal AI\! F-231-
16* Heat sink-held metal AN F-232-
17* Shield cover ANH-212-
Equalizer amplifier assembly AWF-013-
19* C. board holder AEB-019-
FM front end AWB-017-
Tuning pulley assembly AXA-015-
Ground terminal strip (2P) K13-048-
23* Wire clip AEC-064-
Ground terminal strip (4P) K13-047-
25* Wire supporter AEC-151-
Protection circuit assembly AWM-062-
Power supply circuit assembly AWR-054-
Ground terminal strip (4P) K13-047-
29* Wire clip AEC-004-
30* Chassis ANA-067-
Relay ASR-002-
32* Bottom plate AN E-056-
Foot AEC-027-

;:::; ~
c..
c.. c::::
Ci)'
...

Parts List of Exploded View- NOTE:
Parts number is subject to change for the purpose of improvement
with notice of a service bulletin.
Service bulletin will be furnished whenever necessary and you are
requested to amend parts number in this manual according to the
instructions.
NOTICE: Any parts asterisked(* ) are subject to being not supplied.
Key No. Description Part No.
Dial scale AAG-O72-
Dial scale-held metal AN F-243-
Dial pointer AAF-031-
Meter (Signal & tuning) AAW-029-
Lamp Box ANH-211-
Lamp holder ANG-097-
Pilot lamp socket AKK-002-
Pilot lamp 8V, 0.3A (meter) AEL-015-
C. board cover ANG- 100-
Lamp board assembly AWX-069-
Pilot lamp 8V, 0.3A (dial scale) E22-032-
12* Lamp box ANH-210-
Pilot lamp 6V, 30m A (stereo indicator) AEL-014-
Rubber bracket AEB-031-
Front panel assembly AN B-255-
Knob (Power, Tone, Duplicate, Monitor
4 CH adaptor, NR adaptor) AAD-040-
Knob (Bass-sub) AAB-069-
Knob (Bass-main) AAB-068-
Knob (Treble-main, Volume, Balance) AAB-068-
Ornamental ring AAC-034-
Knob (Tuning) AAA-026-
Knob (Treble-sub) AAB-069-
Knob (Dimmer, FM muting) AAD-082-
Coupler (knob-to-switch) AAE-007-
Spacer AEC-152-
Bush AEC-160-
Knob (SPKR A AAD-064-
Knob (Low cut, High cut
, -
20dB) AAD-065-
Knob (Function) AAD-066-
Knob (Mode, Loudness) AAD-067-
Lever switch (Power! ASK-080- KCU
Lever switch (Power) ASK-081- , GN
Phone jack (Headphone) K72-026-
Shading plate AED-018-
Nut (insulator) AEC-085-
35* Sub-chassis AN D-O72-
Phone jack (Microphone) K72-024-
Switch circuit assembly AWS-072-
38* Shield cover ANH-206-
Control amplifier assembly AWG-027-
40* Pulley shaft M49-025-
')':1
Key No. Description Part No.
41 * Pulley AEC-153-
Rubber bracket AEB-057-
Pilot lamp 8V, 50 mA (position) AEL-O23-
44* Lamp holder AN G-099-
45* Pulley-held metal ANG- 102-
46* Pulley AEC-101-
Rubber bracket AEB-057-
Rubber bracket AEB-O58-
49* Sub-panel AND-073-
50* Shading metal AN F-249-
Switch circuit assembly (dimmer) AWS-068-
Tuning shaft assembly AXA-056-
Switch circuit assembly (speaker) AWS-064-
Switch circuit assembly (filter
, -
20dB) AWS-071-
Switch circuit assembly (function) AWS-069-
Switch circuit assembly (mode, loudness) AWS-070-
57* Shield cover ANH-208-
Speaker output terminal AKE-O14-
AC socket A KP-005- KCU, F
5P connector assembly AWX-062-
Fuse holder (AC power) AKRc012- KCU
Fuse holder (AC power) AKR-001-
Phono jack-A (4 jacks) AKB-014-
Phono jack (1 jack) AKB-019-
Phono jack-B (6 jacks) AKB-O17-
Antenna terminal board AKA-002-
66* Rear panel ANC- 105- KCU
Rear panel AI\IC- 111-
Rear panel ANC-113-
AC cord grommet AEC-O79-
AC power cord ADG-005- KCU , F
AC cord grommet AEC-079- KCU , F
Connector (AC power) AKP-008-
70* Model name plate AAL-200- KCU
Model name plate AAL-204-
Model name plate AAL-205-
Binding post for ground AKE-012-
Ferrite loopstick antenna ATB-027-
Ferrite antenna holder assembly W72-092-
,)A

eX-1 0'1 0
Exploded View-
For KCU model
I -
3 J

'----
"'l
""""""",,"" " "" "" " "
A~. --;;:, ""'A"
~'. ",' " ~ .. .- .. . ~" . ' . '
I r "~I:"::",~ I ' J rT:'b:c:~c-i
j ,
-1- , r
-!;';;;
;::' i ."c - r:- , o rL I
:tl
~""
:'i G8~ =r; Jc. IJc' nL~;
, y.- " . .,
I "'
" ,-"
-.J
".. :' " j
I '
,;
"=r.~ 1'1'
" '.
'1 (91,1 ~
',p.
h I ~~. I 'eM
'== ' -.-~..
"'7' . "".'
. + .. . :;;:,
~L 01 ~~. i ~~I
;~~;;;-, ,~;,:;:~;,..
ED .
=- -
' -f9
'" '
!2J-
-0 0 r2-
., ~
II '
-€!
0 -0
12. SCHEMATIC DIAGRAMS P. C. BOARD PATTERNS AND PARTS LIST
12. 1 CIRCUIT CONNECTION DIAGRAM AND MISCELLANEOUS PARTS
,."'
2SC1116A
2SA747A
')7
t;L j
~~ ~~
I ',
~~~~1f-bfd