Pioneer SX-990 Setup guide

INSTALLATION, PERATION
ND SERVICE MANUAL
lncluding PARTS LIST, CtRCUtT DtAGRAMS.
TROUBLESHOOTING AND MOUNTING TEMPLATE
PIONEEIiR"

FE URES
LINE VO GE SELECTION AND FUSE
SWITCHING LINE VOLTAGE SETTING
ln order to remove the fuse, turn the fuse cap located
on the line voltage selector switch in the direction
indicated by an arrow. Then remove the fuse plug
from the unit. Put the fuse plug back so that the
proper line voltage marking can be seen through the
cut in the edge of the plug.
Whenever the set position of the selector switch is
changed, check the rating of the fuse. A 1-ampere fuse
is to be used for either 220V or 24OY operation and
2-ampere fuse for any of 110V, 117V, or 130V
operation. lf the rating of the fuse is proper, install
the fuse in the fuse cap.
FUSE REPLACEMENT
When the fuse is blown, remove the fuse cap and
reolrce the fuse with a nerry one.
AND FUSE
HIGH-PERFORMANCE FM TUNER
An FET (field-effect transistor) is used in the radio-frequency amplifir to attain a high
sensitivity and selectivity. Further, four lCs (integrated circuits) are used for the
intermediate frequency amplifier to eliminate interference and noise.
BUILT-IN EXCELLENT FM MPX CIRCUIT
This wvitching circuit having excellent separation and frequency response is built in for
reproduction of reality music.
BUI LT-IN HIGHLY-SENSITIVE
RADIO RECEPTION FERRITE ANTENNA FOR AM
The ferrite antenna provides high-sensitivity reception of AM broadoast programs.
SPECIAL CIRCUITRY FOR VERSATILITY
The high output given by strictly selected transistors, two sets of loudspeaker terminals
and phono terminals, and the provision for using a microphone make Model SX'990
suitable for the professional use a well a the family use.
A VARIETY OF ACCESSORIES
Accessories include the program lamps that indicate the program being played, the
tuning meters vertically arranged for facilitating selection of an FM broadcast program,
the loudspeaker selector switch, tape monitor switch, etc., all for enjoyable use of Model
sx-990.
ELEGANTLY DESIGNED FRONT PANEL
Newly designed knobs are uniquely arranged on the silver tone panel.
Take off the fuse cap by turning it with a coin,
etc. in the direction indicated by the arrow mark.
Fis. 1

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PROGRAM
1. SPEAKERS SWITCH
A combination of the power onloff switch and the
loudspeaker system selector switch.
Fis. 4
POWER OFF: .....The equipment is deenergized.
The power supplied from the
SWTTCHED AC outtet (36) is discon_
tinued simu ltaneously.
A: '...'."..'...'.........Sound is reproduced from the loud-
speaker system connected to the
SPEAKER OUTPUT A terminats (31
and 32).
SPKR OFF: '...... Loudspeakers stop sounding.
This position is selected when using a
stereo headphone.
B:'..........'...".......The loudspeaker system connected to
the SPEAKER OUTPUT B terminals
(33 and 34) is put in operation.
A + B: The loudspeaker systems connectd to
SPEAKER OUTPUT A and B termi_
nals are put in operation.
SPEAKERS
Fis. 5

2. TUNING METERS
When tuning the receiver to an AM broadcasting
station, adjust the TUNING knob (4) so the pointer
of the lower one of the meters deflects largely
rightward.
When tuning the receiver to an FM broadcasting
station, adjust the TUNING knob so the pointer of
the lower meter deflects largely rightward and, in
addition, the pointer of the upper meter is at the
center.
Tuning to AM Radio Station Tuning to FM Radio Station
Pointer deflecling
largely righiward
Fis. 6
3. FM STEREO INDICATOR
This lamp is lit during reception of an FM stereo
program.
4. TUNING KNOB
The knob for tuning the receiver to an AM or FM
broadcasting station. Adjust the knob for the best
tuning while observing the tuning meters (2).
5. SELECTOR SWITCH
The switch for selecting the program source,
AM: ...'.'.......".. For reception of an AM program.
FM MONO: ..,.. For reception of an FM monaural
program.
FM AUTO: ...'.. For automatically selective reception
of stereo or monaural FM Program.
PHONO 1............For playing a disk record by using the
turntable connected to the PHONO 1
terminals (17).
PHONO 2lMlC: For playing a disk record by using the
turntable connected to the PHONO 2
terminals (18) or for using a micro-
phone by inserting its cord plug into
the MIC jack (16). (When the micro
phone is connected to the jack, the
turntable connected to the PHONO 2
terminals cannot be used.)
6.
K: ..'....'....... For using the cartridge tape player,
reproducing the TV audio output, or
operating other equipment connected
to the AUX terminals {20}.
When the SELECTOR switch is operated, the
program indicator lamp corresponding to the select-
ed source lights.
PHONES JACK
When using a stereo headset, insert its plug into
this jack. For the headset to be used with Model
SX-990, PIONEER's ModelSE-20, SE-30 or SE-50 is
recommended.
When a longer cord is required for the stereo
headset, use PIONEER's Model JB-23 extension
cord separately avai lable.
When desiring to connect two stereo headsets,
use PIONEER's Model JB-22 "Y" cord separately
available.
BASS CONTROL
When this knob is turned clockwise, bass is increased;
when turned counterclockwise, decreased. With the
knob set to the center, the frequency response curve
is flat. The center and outer knobs of this double
knob are friction-coupled with each other, and the
tone of both left and right channels can be adjusted
simultaneously by turning either knob. The center
knob is for the left channel, and the outer knob is
for the right channel. When adjusting the tone of
only one of the channels. turn the knob for that
channel while holding the other knob by the other
hand.
RTGHT bUnruruel
(cH .R)
7.
LEFT CHANNEL
(cH .L) Fig. 7

8. TREBLE CONTROL
Use of this knob is similar to that of the BASS
control knob (7).
9. FILTER SWITCHES
LOW: A switch f or suppressing low-frequency
noise or hum.
HIGH: A sruitch for suppressing high-frequency
notse.
These switches are of the pushbutton type. When
once the button is pressed, the switch turns on, and
when pressed once again. it turns off.
10. BALANCE CONTROL
This knob is used for adjusting the stereophonic
balance. When the volume of the right channel
loudspeaker is smaller, turn the knob clockwise
toward RIGHT; when left channel volume is smaller.
counterclockwise toward LEFT.
BALANCE
olume of When the volwre of
I right channel
is loudspeaker is
smaller
LEFT FIIGHT
11. VOLUME CONTROL
The volume increases when the knob
clockwise.
Fis. 8
turned
12. LOUDNESS SWITCH
With this switch turned on when the sound volume
is low, insufficiencies of bass and treble are com-
pensated for. When the sound volume is high, it is
recommended to keep this switch turned off.
13. MUTING SWITCH
Turning on this switch, the noise generated when
tuning the receiver to an FM station can be
eliminated. lf Model SX-990 is used where the FM
field strength is low, keep this switch turned off
since the program sound is also suppresed with the
switch turned on.
sx,990
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OUTPUI
ORlcHrJ
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oLEFT ___-l
OUTPUT
oRTGHT--J
oLEFT ----l
OUTPUT
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oLEFr ---.1
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14. TAPE MONITOR SWITCH
Turn on this switch for listening to or monitoring
only the signal reproduced by a tape deck (or tape
recorder). When not using the tape deck (or tape
remrder), keep this switch turned off. Otherwise,
loudspeakers will not sound.
15. MODE SWITCH
Functions as follows:
REV....... Stereo, with left and right channel
input signals exchanged for each
other.
STEREO... Normal stereo
L'..'.......'... Monaural play with only the left
channel input signal fed to both
channel loudspeakers.
R...'."....... Monaural play with only the right
channel input signal fed to both
channel loudspeakers.
L + R ..'..... Monaural play with both left and right
channel input signals mixed together
and reproduced from both channel
loudspeakers.
lst.-.n
r---F
.NPUT | | ourdur
-i,Gnro l I oRrGHrJ
f- LEFT O
INPUT
[- nrerro
[- LEFT O
INPUT
l-nrasro
Fig. 9
16. MIC (MICROPHONE) JACK
When a microphone is connected to this jack, the
signal fed from the turntable connected to the
PHONO 2 terminals (18) on the rear panel is
disconnected.

I
The upper ones of the terminals 17,18,20,21 ,22,
28 and 29 are for the left channel respectively; the
lower ones, for the right channel
17. PHONO 1 TERMINALS
MAG: ......... Connect here a turntable equipped
with a moving magent cartridge.
CER:.......... Connect here a turntable equipped
with a ceramic or crystal cartridge.
NOTE: Two turntable cannot be connected
to the MAG and CER terminals
simu ltaneously.
18. PHONO 2 MAG TERMINALS
Connect here a turntable equipped with a moving
magnet cartridge.
TERMINALS AND CONNECTORS ON THE REAR NEL:
Fis. 10
19. GND (GROUND) TERMINAL 1
lf the turntable or other equipment used with
Model SX 990 is provided with a ground wire,
connect the wire to this terminal.
20. AUX. (AUXILIARY) INPUT TERMINALS
Connect here the output of a cartridge tape player
21. TAPE MON TERMINALS (TAPE PLAY-
BACI( INPUTS)
Connect the line output or monitor output of tape
deck (or tape recorder) to these terminals
22.TAPE REC TERMINALS (TAPE RECORD.
ING OUTPUTS)
Connect the line input of a tape deck (or tape
recorder), Signal is always supplied to these termi-
nals while SX 990 is workinq; however, the signal

cannot be controlled with the VO LUME ( 1 1),
BALANCE (10), TREBLE (8) or BASS (7) controt
on the front panel.
23. TAPE REC/PB CONNECTOR
(DI N TYPE)
lf the tape deck (or tape recorder) to be used with
Model SX-990 is provided with a record/playback
connector of the DIN type, the tape deck (or tape
recorder) can be connected to Model SX-ggO for both
recording and playback (and monitor) by simply
connecting the DIN cable.
When this cable is used, connections to terminals
(21l. and(221 are unnecessary.
The detail of connection is shown on page 10.
Connectjon of tape deck (or tape recorder),,;
24. AM FERRITE ANTENNA
Where the field strength is high, adjust the direction
of this ferrite antenna for gmd reception, without
using an external antenna. lf good reception cannot
be obtained, see page 9.,,Antenna Connection and
Grounding".
25, AM ANTENNA INPUT TERMINAL
Connect a lead wire or outdoor AM antenna to this
termina I if the ferrite antenna (24) cannot get
good reception.
26. GND (GROUND) TERMINAL 2
Connect a ground wire to this terminal.
27. FM ANTENNA INPUT TERMINALS
Connect an FM antenna to these terminals.
NOTE: For the details of AM antenna, FM
antenna and grounding, see ,,Antenna
connection and grounding" on page 9.
28. !RE-AMP OUTPUT TERMTNALS
The output of preamplif ier stage, which is the signal
having passed the tone control circuit is always
supplied to these terminals.
29. MAIN-AMP INPUT TERMINALS
These are input terminals of the power amplifier
stage of Model SX-990.
The PRE-AMP OUTPUT (28) and MA|N-AMP
INPUT (29) terminals are connected to each other
with the jumper plugs. With these plugs removed,
the preamplif ier and power amplif ier stage of
Model SX-990 can be used apart. This system is
convenient for composing a multi-amplifier system
and other purposes.
30. CENTER CHANNEL OUTPUT TERMI.
NAL
The signals of left and right channels are mixed
together and supplied to this terminal at all times.
The terminal may be used for composing a 3_D
system or connecting a center-channel amplifier.
31. & 32. SPEAKER OUTPUT A TERMI.
NALS
Model SX-990 is designed to permit connection of
two sets of stereo loudspeaker systems.
Connect the first set of loudspeaker system (system
A) to these terminals; the right channel to terminal
(31) and the left channel to terminal (32).
33. & 34. SPEAKER OUTPUT B TERMI-
NALS
Connect the right channel loudspeaker of the second
loudspeaker system (system B) to terminal (33) and
the left channel loudspeaker of this system to
terminal(34).
For ornetion SPEAKER
OUTPUT A ad supplied as
accessories nrust irstr:uctions
under "Connection o system,, on p4e
9, for the oorect use
35. LINE VOLTAGE SELECTOR AND
FUSE HOLDER
This selector is used for setting the SX-990 to suit
the line voltage to be supplied. lt also serues as a fuse
holder.
For the selector setting and fuse replacement proce.
dures, refer to the article "LINE VOLTAGE SELEC-
TION AND FUSE". (Pase t)
36. SWITCHED AUXILIARY AC OUTLET
A power of 23O VA can be supplied to a turntable
or other eqLipment from this outlet. The power
supply is turned on and off corresponding to the
turning-on and off operations of the SPEAKERS
switch (1) on the front panel.
37. UNSWITCHED AUXILIARY AC OUT-
LET
The power outlet also having a capacity of 230 VA
total. The power from this outlet is supplied
regardless of the operation of the SpEAKERS switch
(1).
38. AC POWER CORD
After all the external equipment is connected to
Model SX-990, connect this cord to a commercial
power outlet having a sufficient capacity.

a
CONNECTION OF LOUDSPEAKER SYSTEM
To connect a loudspeaker, take out a speaker
connector plug from the accessories bag, and con-
nect it to the leads of the loudspeaker as illustrated
in Fig. 11.
Be sure to connect them for the correct polarity.
When the plugs have been connected to loud-
speakers, connect the plug of the right channel
loudspeaker to the SPEAKER OUTPUT A terminal
(31) and that of the left channel loudspeaker to the
SPEAKER OUTPUT A terminal (32). (See Fig. 2.1
When using an additional loudspeaker system,
connect the speaker connector plugs to the loud-
speakers as described above, and connect the plug of
the right channel loudspeaker to the SPEAKER
OUTPUT B terminal (33) and that of the left
channel loudspeaker to the SPEAKER OUTPUT B
terminal (34).
ANTENNA CONNECTION AND GROUNDING
FM ANTENNA
When using Model SX-990 at a place of low field
strength or distant f rom the station, select the most
suitable FM antenna as follows:
. Use the accessory T-type indoor antenna when using
Model SX-990 within a wooden building near the
FM radio station. Connect the free and of the
vertical section of the antenna to the FM antenna
terminals (27]' as shown in Fig.12'
Expand the horizontal section of the antenna, and
determine its direction for good reception while
actually receiving a broadcast program. Fix the
horizontal section on a wall or other place in the
determined direction. For the operating procedure,
see "Reception of FM broadcasts" on page 1 1.
o When using Model SX-990 at a long distance from
the station, or within a building, install an outdoor
FM antenna, and connect it to the FM antenna
terminals (211 as in Fig. 13.
The FM antenna is various in type, consisting of 3 to
7 elements. Select the optimum antenna by consult-
ing a nearby radio, TV or hi-fi equipment sales store.
AM ANTENNA
When using Model SX-990 near the broadcasting
station or inside a wooden building, connection of
an external AM antenna is unnecessary. Adjust the
direction of the AM ferrite antenna (24) located on
the rear panel for the best radio reception while
actually listening to broadcasts, referring to "Re-
ception of AM broadcasts" on page 1 1.
SPEAKER PLUG
POSTTIVE (+)
NEGATIVE H
Fis. 11
lf good radio reception cannot be attained with the
AM ferrite antenna (24), use the accessory AM lead
wire antenna. Connect one end of the antenna to the
AM antenna terminal (25), and expand the wire
along a wallof the room. (See Fig. 12.)
lf input is still not enough, install an AM antenna
outdoors instead of using the lead wire antenna. (See
Fis. 13).
NOTE: A standard AM outdoor antenna can be
formed by purchasing PVC wire from an
electric appliance store and installing it 25
feet (7.5 m) above the ground for a
horizontal length of 50 feet (15 m), with a
feeder line 30 feet (10 m) long. These
antenna dimensions need not be so
precise, and may be as large as allowable
by the place of installation. However, the
height of the horizontal section of the
antenna should not be too low to attain a
good antenna effect.
SPEAKER TERMINALS
LOUDSPEAKER

GROUNDING
o Whether or not Model SX-990 is grounded does not
much affect the performance of the equipment.
However, grounding is recommended for stabiliza-
tion of the performance.
o Connect to the GND terminal 2 126l a ground
conductor leading to the earth.
AM FERRITE ANTENNA
CONNECTION OF TURNTABLE
lf the turntable to be used is equipped with a
moving magnet cartridge, connect the output
cords of the turntable to the MAG terminals of
PHONO 1 (17) on the rear panel; if equipped
with a ceramic cartridge, to the CER terminals
of PHONO 1 (171.
Connect the left channel output cords of the
turntable to the upper terminal, and the right
channel output cord to the lower terminal.
When using a monaural turntable, its output
cord may be connected to either upper or lower
terminal.
To use two turntables both having a moving
magnet cartridge, connect one to the pHONO 1
MAG terminals (17) and the other to the pHONO 2
- MAG terminals (18).
NOTE:1. When desiring to use a turntable equip
ped with a moving coil (MC) cartridge,
use a matching transformer "for MC
cartridge, or a separate head amplifier for
connection of the turntable to MODEL
sx-990.
2, The output cords of some turntables are
provided with plugs which do not meet
the input terminals of Model SX-ggO.
ln such a case, replace the plugs with the
pin plugs contained in the accessories
bag.
o The tape deck to be connected to Model sx-ggo
should have a record/playback preamplifier built-in,
such as PIONEER's ModelT-600, T-S00.
o The tape recorder to be connected should have
output terminals (line output) for external amplif ier,
or tape monitor terminals.
CONNECTION FOR TAPE RECORDING
Connect the LINE INPUT terminals of the tape deck (or
tape recorder) to the TAPE REC terminals (22) on the
rear panel. For this connection
to the tape deck (or tape recor
is for the left channel, and the
channel. lf the tape recorder is
the upper terminal.
CONNECTION OF CARTRIDGE TAPE PL ER
CONNECTION FOR TAPE PLAYBACK (OR TAPE
RECORDING MONITOR}
Connect the LINE OUTPUT or tape monitor termi-
nals of the tape deck (or tape recorder) to the TApE
MON terminals (21). Use of the terminals is similar
to that for the connection for recording described
above.
USE OF RECORD/PLAYBACK CONNECTOR
lf the tape deck (or tape recorder) is equipped with
a record/playback connector of the DIN type,
connect the connector to the TAPE REC/p.B.
connector (23) by using the DIN cable that is
separately available. ln this case, connections as
described in "Connection for tape recording,, and
"Connection for tape playback (or tape recording
monitor)" above are unnecessary.
When using a cartridge tape player, such as PIONEER,s
Model H-60, connect its output to the AUX terminals
(20) on the rear panel.