Technics ST-500 User manual

Technics
OUARTZ Synthesizer AM/FM Stereo Tuner
ST-500
OUARTZ Synthesizer LW/MW/FM Stereo Tuner
ST-500L
OPERATING INSTRUCTIONS
• These instructions also apply to units of different color.
Before operating this unit, please read these instructions completely.

We want to thank you tor selecting this product and
to welcome you to the growing family of satisfied
Technics product owners around the world.
We teel certain you wil! get maximum enjoyment
trom this new addition to your home.
Please read these operating instructions carefully,
and be sure to keep them handy tor convenient
reterence.
These Operaling Instructions are applicable10 models ST·500 and ST·500L. The functions which differ for thetwo models are indicated in the
Operating Instructions.
Contents
-Accessories . . . . . . . . . . . . . . .. . . . . . .. . . . . . . .. 2 -Memory Presettings .................... '" 6
-Before Use . . . . . . . .. . . . . . . . .. . . . . . .. . . . . . . 2 -Listening to Radio Broadcasts
.. . .. .... 8
-Suggestions for Safety. . . . . . .. . . . . . .. . . . .. 3 -Maintenance
.............................. 9
-Connections .............................. 4 -Technical Specifications. . . . . . .. . . . . .. . . . .. 9
-Front Panel Controls and Their -Troubleshooting Guide
.................... 10
Functions . . . . . . . . .. . . . . . . . .. . . . . . . .. . . . . .. 5
Accessories (Reler to page 4.)
•
AC power supply cord. . . . . .. . 1 •
FM indoor antenna. . ... . .. 1 •
AM loop antenna ... . . . . . . . . . 1
• Stereo connection cabie. . . . . . 1 • AM antenna holders. . . . . . . . . . 2
·Screws ..................... 2
~
~(A)
~(B)
Note: Conliguration ol AC power supply cord and FM indoor antenna dilIers according to area.
Before Use
Be su re to disconnect the mains cord belore adjusting the (11 Ihe power supply in your area is 117 V or 120 V, set 10 the "127
voltage selector.
V" position.)
Use a minus
(-) screwdriver to set the voltage selector (on the Note that Ihis unit will be seriously damaged il Ihis setling is not
rear panel) 10 the voltage setting
lor Ihe area in which Ihe unit will made correctly. (There
is no voltage selector lor some countries;
be used. the correct voltage
is al ready set.)
THIS TUNER/RECEIVER
IS CAPABLE OF RECEIVING THE NEW AM STEREO BROADCASTS FROM THE AM BAND RADIO STATIONS.
HOWEVER LlKE MANY TUNERS AND RECEIVERS CURRENTLY AVAILABLE ON THE MARKET IT WILL REPRODUCE THIS AM STEREO
SIGNAL ONLY IN AM MONO. WHICH, IN EFFECT. IS OF NO LESSER QUALITY THAN YOUR EXISTING AM MONO TUNER/RECEIVER
-2-

Suggestions for Safety
• Use a standard electrical AC wall outlet
1. Use from an AC power source of high voltage, such as for
air condItIoners,
Is very dangerous.
Be extremely careful not to make a connection to the elec-
trical outlet
lor a large air conditioner or central-heating unit
which uses high voltage, because there
is the possibility ol
lire.
2. A DC power source cannot be used.
Be sure 10 check Ihe power source carelully, especially on a
ship or other place where
DC is used.
• Connection and removal of the power cord
plug
1. Wet hands are dangerous.
A dangerous electric shock may result il the plug is touched by
wet hands.
2. Don't pull the power cord.
Always grasp the plug; never pull the cord itselt.
x
• Never attempt to repair or reconstruct this
unit
A serious electric shock might occur il th is unit is repaired,
disassembied or reconstructed
by unauthorized persons, or il the
inlernal parls are accidently touched.
x
• For families with children
Never permit children to put anything, especially metal, inside
th
is unit. A serious electric shock or malfunclion could occur il ar-
ticles such as coins, needies, screwdrivers, etc. are inserted
through the venlilation holes, etc.
ol th is unit
x
• Turn oft after use
II the unit is lef! lor a long time wilh the power on, this will not only
shorlen its uselul operation lile, but
mayalso cause other unex-
pected trouble.
• If water is spilled on the unit
Be exlremely careful il water is spilled on Ihe unit, because a lire
or serious electric shock might occur. Immediately disconnect
the power cord plug, and consult with your dealer.
x
• Place the unit where it will be weil ventilated,
and away from direct sunlight
Place this unit at least 10 cm (4") away Irom wall surfaces, etc.,
and away Irom direct sunlight.
x
• Keep the unit away from heaters, etc.
Heat can damage the external surfaces as weil as internal cir-
cuits and components.
x
• Avoid spray-type insecticides
Insecticides might cause cracks or "cloudiness" in the cabinel
and plastic parls ol Ihis unit.
The gas used in such sprays might,
moreover, be ignited suddenly.
• Never use alcohol or paint thinner
These and similar chemicals should never be used, because they
may damage the linish.
x
P9Wer
61
• If trouble occurs
x
.'
It, during operation, the sound is interrupted or indicators no
longer illuminate, or il abnormal odor or smoke
is detected, im-
mediately disconnect the power cord plug, and contact your
I
~
dealer or an Authorized Service Center.
3

1I FM antenna terminal is as shown belOW:
l
Be sure the shield braid contacts the clamp.
Stereo connection cable (included)
"--~..:::..~~~~~~~~~C~~~~· (L)
The indication AM used here includes
both MW and
LW lor Model ST-500l.
Connections
Note: An outdoor antenna should be installed by a competent technician only.
FM ouldoor antenna (option) FM indoor antenna (included)
(Necessary
in mountainous regions, inside
reinforced-concrete buildings, etc.)
75-ohm coaxial
cab
Ie (option)
1 [J'" LJBJ:=t J
20 mm (25/32 ) 10 mm (3/8 ) -
Clamp
Shield braid
Center
conductor
~'~(
T~ or tape I
or ~
----
Installalion of Ihe AM loop anlenna
1. Pay attention to the following points when attaching the anten-
na.
• Do not attach it horizontally (to
do so would impair recep-
tion).
• Do not attach it close to metal surfaces (to do so would
result
in noise).
Wh en attaching the antenna to a wal!, column
or rack
Find the height and direction of the antenna where
reception
is best and then fix it vertically to the wall,
rack, etc.
J~
AM loop
antenna (included)
_,.~.I
Column i 6 >
,",,~.
i
AM antenna
holder (A) (included)
• Attach to a wall (using tack or tape) facing in direction
(.~-"
of best reception.
• Tack should not
contact internal antenna wire.
Tack or tape
i:
• For best reception sound quality, an FM outdoor anten-
/'/
i na
is recommended.
,.JJ.,
• Disconnect this antenna if an FM outdoor anten na is in-
stalled.
Control input terminal (CONTROL INPUT):
This terminal is used for the connection of a timer for
the purpose
of controlling the tuner by means of an
external control signal.
Household
AC outlet
." .. -~
AC power supply cord (included)
Configuration of
AC power supply
cord differs according to area.
To tuner input terminals
(R) of the amplifier
AM loop anlenna (included)
If th
is antenna is not properly instalied,
AM broadcasts will not be received.
Be sure to connect the AM loop antenna
even when an outdoor antenna
is used.
AM ouldoor antenna (option)
5
~ 12 m (16 ~ 40 ft.) (Necessary in mountainous regions, in-
side reinforced-concrete buildings, etc.)
Use5 - 12m(16 -40 ft.) of vinyl-
covered wire horizontally at the window.
'nyl-covered wire (option)
• Do not attach
it close to power cords, speaker wires, etc. (to
do so would result in noise).
• Do not attach it close to a tape
deck (when the tape deck is
being used, chirping or beeping sounds may be received).
2. Connect the AM loop antenna to the AM 3ntenna terminals
located on the rear panel of the unit.
When attaching the antenna to the unit ---,
This type of installation may cause impaired reception
or result in signaI noise. If possible, attach the antenna
to the rack, a wall, or a column.
Move the anten
na toward the right or left to find the
point of best receptioll. AM
loop antenna
(included)
-4-

I
Front Panel Controls and Their
The indication AM used here includes
both
MW and LW tor Model sT·500L.
Functions
Power "stand by eb, on" switch
This switch turns on and olf the secon-
dary circuit power
only_ The unit is in the
"stand-by" condition when this switch is
set to the
"stand by ó" position.
Regardless
ol the switch setting, the
primary circuit is always
"live" as long as
the power cord is connected to
an elec-
trical oullet.
Memory indicator
(memo)
This indicator illuminates
when the memory bulton
is pressed.
FM stereo indicator
(stereo)
This indicator
automatically illuminates
wh
en an FM stereo
broadcast is being
received.
Band selectors (band) ---
FM:
Press th is button to listen to an FM
broadcast.
AM:
Press this button to listen to an AM
broadcast.
allocation:
This bulton is also used to select a Ire-
quency step of either 9 kHz or
10kHz.
When the AM button is pressed for
about 4 seconds, the AM Irequency
step wil! change to
10kHz per step.
(This slep is set to 9 kHz belore ship-
men!.)
Sel to the appropriate posilion
lor your
locality.
In order to relurn to the original Ire-
quency indication, press this button
lor about 4 seconds again.
Digital frequency display
Note: The reception Irequency of the
FM or AM broadcast
It will not illuminate il the
FM mode selector is set selected by using the tuning buttons or the preset-tun-
to the monaural mode. ing buttons is indicated by a digital-type display.
FM
MW LW
Band selectors (band)
FM:
Press Ihis button to listen to an FM broadcas!.
MW:
Press Ihis bulton 10 listen 10 an MW broadcast
allocation:
This button is also used 10 select a frequency
step
ol either 9 kHz or 10 kHz.
When the MW button
is pressed lor about 4
seconds, the MW Irequency step will change to
10 kHz per step.
(This step is set to 9 kHz belore shipment.)
Set to the appropriate position lor your locality.
In order to return to the original frequency indica-
tion, press this button
lor about 4 seconds again.
LW:
Press this button 10 listen 10 an LW broadcast.
freq shift:
When Ihe LW bullon is pressed for aboul 2
seconds during reception
ol an LW broadcast,
the LW Irequency will decrease by 2 kHz.
So, for example, 10 receive 153 kHz, lune 10 155
kHz, and then press this button.
In order to return
10 the original Irequency indica-
tion, press this button
lor about 2 seconds again.
ST· 500
Channel display -------'"
The channel number selected by the preseI-
tuning buttons
is displayed. These buttons are used lor tuning to the
desired broadcast station.
Quartz·lock indicator (quartz loek)
This indicator illuminates when tuned precisely to
an FM or AM station.
Signal-strength indicators (signal) _----'
These indicators show the relative strength of broadcast
signals being received by the antenna. The best condi-
tion
lor reception, lor FM and AM, is when the indicators
illuminate completely to the top.
Preset-tuning buttons (1 -16)
Memory button (memory)
-----"
This button is used when preset memory setting
ol the preset-tuning buttons is made.
FM mode selector (FM mode)--..;/
This unit automatically switches into the stereo mode wh en a
stereo broadcast is received. Press this button to listen
in the
monaural mode. The stereo indicator will not illuminate
in the
monaural mode.
(16 channel random preset tuning)
These bultons are used
to preset FM and AM broadcast Irequencies into the memory
ol this unit, and are also pressed to select the desired preset Irequencies.
Note:
Reler 10 pages 6 and 7 for inlormation concerning preset memory.
5-

The indication AM used here includes
both
MW and LW for Model ST·500l.
Memory Presettings
Importantl-----------------
Notes:
1. For automatic presetting in areas where there are Ie ss than 16
II this antenna is not installed,
FM stations, the remaining channels (through channel 16) wil!
AM broadcasts will
not be be lelt empty. The empty channels can
be lilled by using
received,
AM lOOp antenna manual memory presetting.
2 II a new broadcasting station is preset into a channel, the
broadcasting station which was previously entered
in that
With
th is unit you may preset as many as 16 radio broadcast sta- channel will be automatically erased,
tions: FM/AM random presetting, After broadcast stations have
3. For AM broadcasts with extremely strong signaI transmis·
been preset as described below, any desired station can be quick- sions, the frequency memorized may be slightly different Irom
Iy and easily selected by simply touching one button the
correct frequency, If this occurs, use the manual control to
memorize.
Automatic memory presetting
The FM broadcasting stations and AM broadcasting stations will be automatical!y preset to "channels" 1 through 16 lor FM
and 9 through 16 lor AM, respectively,
The
FM broadcasting stations, MW broadcasling stations, and LW broadcasting stations will be automatically preset in
"channels" 1 through 16 for FM, 9 through 16 for MW, and 13 through 16 for LW, respectively.
Note: When AM is automatically preset, Ihe FM stations on "channels" 9 through 16 wil! be replaced by the new AM stations,
"FM": lor FM broadcasts Before presetting the broadcasting
"on" (I- __ ) "AM": for
AM broadcasts stations, press to select the
appropriate frequency step for your
"FM": for FM broadcasts locality,
Channel display "MW":
lor MW broadcasts (Reler to page 5.)
"LW": for LW broadcasts
Memory indicator
5Confirm the names (call signs, 3Set to the lowest frequency.
etc.) of the broadcasting sta· Tuning Press the left button to change the Irequency downward,
tions which are preset to each and press the right button to change the frequency upward.
channel, and enter them
on the
-FM: 87.50 MHz
file sheet (page 8).
-AM: 522 kHz (9 kHz step) or 530 kHz (10 kHz step)
• To check the front channels (CH 1- 8)
- FM: 87.50 MHz
Press momentarily,
-MW: 522 kHz (9 kHz step) or 530 kHz (10 kHz step)
- LW: 153 kHz (- 2kHz shift) or 155 kHz
o~
.1 Press the button and hold slightly (frequency wil! change con-
'r%
tinuouslYl·
...
•
Frequency stored in the memory and
channel number are displayed, 2 Release it when approaching the above exact frequency,
2:Q~
and then press Ihe button again momenlarily (frequency
0-' ,r, 3:
change will stop) •
Pu1 'UMHICI', wl:J.
.... _~--
Ofu
• To check the back channels (CH 9- 16) ',t Press the button momentarily (Irequency wilI change each
Press slightly longer. time Ihe button is pressed), and tune
10 one of the above Ire- •
.' 1<
quencies.
*
C3/0~
,'",,_-i;;'r~,;'
L%
4Press. When the frequency indication begins
to change,
Frequency stored in Ihe memory and release.
channel number are displayed. The frequency will change upward, and the automatic presetting wil! begin
(J.g,
with Ihe next broadcasling station,
It will continue
10 preset consecutive broadcast stations.
-6-

• "Most·recent" memory • To prevent erasing the memory
The most-recent memory is a system by which the unit
1I the power supply is interrupted lor one week or longer, the
"remembers" the FM or AM broadcast station last heard when memory settings will be erased.
th
is unit is turned olf, and automatically tunes to that station the For example:
next time the power
is turned on.
1) If the power cord is disconnected from the electric outie!,
2) If an audio timer is used and the timer does not operate the I
tuner for a week or longer,
3) If a power failure occurs, etc.
• "Back·up" memory
This is the function which preserves the preset memory and If any of the above occurs, the memory will have to be reset.
most-recent
memory functions. In the event of a power failure, or The memory
in th is unit is maintained by a gold capacitor. If the
if the power cord
of the tuner is disconnected from the electric power supply
is interrupted for a week or longer, set the power
outlet, the back-up
memory will preserve the preset memory and switch
of the tuner to the "on" position for thirty minutes or more
most-recent
memory functions for as long as approximately one
in order to recharge the gold capacitor. Then reprogram the
week.
memory (pages 6 and 7).
Manual memory presettfng
Stations can be freely preset to any desired channel.
2
1 "FM"·. for
FM broadcasts Before presetting the broadcasting
"'1 "'1.I;ID
"on" (I-.OL)
----. -- "AM": for AM broadcasts stations, press to select the
appropriate frequency step for your
"FM": for FM broadcasts locality.
_'1"'11 11 ]_
--_ •• ,- "MW": for MW broadcasts (Refer to page 5.)
"LW": for LW broadcasts
Channel display
Memory indicator
5While the memory indicator is 3Press the appropriate tuning
iIIuminated, press the button the desired broadcast.
of the desired channel. Tuning
When the button is pressed, the memory in- Press the left button to change the frequency downward, and
dicator illumination will stop, and the preset- press the right button to change the frequency upward
• Automatic tuning
ting is complete. Press the button. When the frequency indication
• To preset channels 1 through 8:
begins to change, release the button
(a broadcasting
Press the appropriate button momentari- station will be selected automatically). Repeat this
Iy, and then release. (Preset channel operation until the desired station
is found.
number
is displayed on the channel • Manual tuning
display.) Press the button momentarily and tune to the desired
• To preset channels 9 through 16: station. The frequency will change each time the but-
ton
is pressed.
Press the appropriate button slightly
longer, and then release. (preset chan-
nel number
is displayed on the channel
display.) 4Press momentarily, and then
Note: (The memory indicator will illuminate for approx-
If the memory indication illumination stops before imately 4 seconds.)
you press the button,
once again repeat step 4 and
then step
5.
Note:
6Enter the name (call sign, etc.) of the preset If the button
is pressed continuously, the frequency
broadcasting station on the station
will begin to change, and the memory will be preset
memory file sheet (page 8).
automatically.
This completes the procedures for presetting radio broad- To stop the automatic memory presetting, once
cast frequencies. The other preset-tuning buttons can be again press either the "llP" button or the
"down" but-
preset
in the same way by following steps 2 through 6.
ton.
-7-

Listening to Radio Braadcasts
Important!-----------------..
If this antenna is not installed,
AM
broadcasts will not be
received.
Have you completed the memory presetting (page 6 and 7)?
AM loop antenna
1Turn
the amplifier on, and set it for listening to
radio broadcasts.
3
Select the desired station by using either the
manual or preset·tuning buttons.
2 "on" ( • - ... ) For station setection using
preset~tuning buttons
• To select the front channels (CH 1- 8):
• To select the back channels (CH 9 -16):
Press Frequency stored in the Press slightly Frequency stored
in the
momentarily.
~ memory and channel
longer ~ memory and channel
number are displayed. number are displayed.
ï :,....,
Ol
'!...!...I k.Hzch ~
For manual station selection.
Follow step 2, 3 of "Manual memory presetting" on page 7.
5T·500
.~ _.
- ~
~
--~- __ ...... --
! .t_tI j .2_10 I 3_11 I -4_12 ! 6_13! .6_"! 7_15! &_1& I
·~iiii:._·
.----.g_ ..
§j bau::
_ .. _ r~~~-- -- ~
~~~w
.::::::::::,:;;;:;:-
~i'P
~4 •
• 1 ••. 4 •
.. ..
FM mode selector (FM mode) _------../
If the broadcast signal is weak, or if there is a large amount of in·
terference in a stereo broadcast, set to the monaural position.
Note that the
FM stereo indicator will not illuminate in this posi-
tion.
Station Memory File Sheet
CH.8
CH.1 CH.2 CH.3 CH.5 CH.6 CH.7
CH.4
CH.16
CH.14 CH.15
CH.9 CH.10 CH.11 CH.12 CH.13
-8-

I
Maintenance
To clean this unit, use a soft, dry cloth. Wipe once again with a soft,
dry cloth.
II the
surlaces are extremely dirty, use a solt cloth, dipped into a Never use alcohol, paint thinner, benzine, nor a chemically
soap-and-water solution
or a weak detergent solution. treated cloth to clean this unit.
Wring the cloth weil
before wiping the unit. Such
chemicals may damage the linish of your unit.
Technical Specifications
(DIN 45 500)
• FM TUNER SECTION
• AM (MW) TUNER SECTION
Frequeney range
87.50~108.00 MHz (0.05 MHz step) Frequeney range
522~1611 kHz (9 kHz-steps)
Sensitivity 1.5 J,N1750
(IHF '58)
530~1620 kHz (10 kHz-steps)
SIN 30 dB 1.3
j.1V (750)
Sensilivily (SIN 20 dB) 20 I.N,
3001.Nlm
SIN 26 dB 1.2j.1V
(750)
Seleclivily (+9 kHz) 55 dB
SIN 20 dB 0.9j.1V
(750)
Image rejeelion al 999 kHz 40
dB
IHF 46 dB slereo quieting sensilivily 22 j.1V/750 IF rejeclion
al 999 kHz
60dB
Tolal harmonie dislortion
MONO
0.15% • LW
TUNER SECTION
(ST -500L only)
STEREO 0.3%
SIN
Frequency range
155~353 kHz
MONO
70 dB (78 dB, IHF '58)
153~351 kHz (2 kHz shilt)
STEREO 65
dB (70 dB, IHF '58) Sensitivity
(SIN 20 dB) 50 j.1V
Frequency response 20 Hz~15 kHz, -0.5 dB~-1.5 dB
Selectivity at 254 kHz 55 dB
Allernale channel selectivity Image rejection at 254 kHz 40
dB
normal :::400 kHz 65
dB
IF rejeetion at 254 kHz 60 dB
Capture ratio 1.0
dB
Image rejection at 98 MHz
40dB
• GENERAL
IF rejection at 98 MHz
70 dB
Spurious response rejection at 98 MHz
70 dB
Output voltage 0.3V (O.6V, IHF)
AM suppression 55
dB
Power eonsumption 9 W
Stereo separation Power supply
1 kHz 40
dB
For Australia AC 50
Hz/60 Hz, 240V
10 kHz 30
dB
For continental Europe AC 50 Hz/60 Hz, 220V
Carrier leak For others
AC 50 Hz/60 Hz, 11 OV /127V1220V /240V
19 kHz
-30 dB (-35 dB, IHF) Dimensions
(WXHXD) 430 X 53 200 mm
38 kHz
-45 dB (50 dB. IHF)
(16-15/16" X 2-2/32" X 7-27/32")
Channel balanee (250
HZ~'6,300 Hz)
.5 dB
Weight 1.8 kg (3.9 lb.)
Limiting point 1.2
j.1V
Bandwidth Note:
IF amplifier
180 kHz
Total harmonie distortion is measured by the digital
FM demodulator 1000
kHz
spectrum analyzer (H.P. 3045 system).
Antenna terminals
750 (unbalanced)
9-

Troubleshooting Guide
Belore requesting service lor th is unit, check Ihe chart below lor a possible cause ol the problem you are experiencing. Some simple checks or
a minor adjuslment on your part may eliminate Ihe problem and restore proper operation.
11 you are in doubt about some ol the check points, or il Ihe remedies indicated in Ihe chart do not solve Ihe problem, reler to the directory ol
Authorized service centers (enclosed with this unit) to locate a convenient service cenIer, or consult your Technics dealer for instructions.
Probable cause(s) Suggested remedy
Nearby building or moun n.
(Mulli-path distortion is being caused by the
mutual interference
of broadcast signals
received
directly from the transmitting station
(direct waves) and signals being reflected Irom
nearby buildings or mountains (reflected
ning buttons ol this unit have not
• Try reducing the treble sound by turning Ihe
treble lone control ol the amplilier.
• Set the FM mode selector to the mono position.
(Note that the broadcast will then be heard as
monaural sound.)
• Try
changing the location, height and/or
dirèction ol the antenna.
• II an indoor antenna is being used, change to an
outdoor antenna.
• T usi an anten
na with more elements.
•
Try changing the location, height and/or
direction ol the antenna.
• II an indoor antenna is being used, change 10 an
outdoor antenna.
•
Try using an antenna with more elements.
•
minutes or more to perlorm the charging, and
then make
the memory presetting again.
10 -