LG GoldStar TSR-580 User manual

Gold Star Audio
SERVICE MANUAL
for
service technician
: SPECIFICATIONS
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GoldStar
a ttre aa neat Nhe eeainhORvUNe nt
STEREO CASSETTE RECORDER
with RADIO
TSR-580 (em/swuwim
TSR-585 (rm/sw,/sw, saw
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|
This specifications may be changed for improvement of performance without notice.
Radio section
aaa dig aie ke Be Superheterodyne
AM/FM MPX Stereo
AM: Ferrite ant.
FM: Double rod ant.
FM: 87.5-108MHz
SW2: 6.8-22.5MHz
SW1: 2.25-7.2MHz
SW: 5.8-18.3MHz
MW: 525-1 ,605kHz
LW: 150-350kHz
AM: 455 (465) kHz
Circuit system
co e@ © 8 @© *# @ 6 #@# #@ 8 @ 8 €
Intermediate frequency
FM: 10.8MHz
Usable sensitivity. ........ MW: 54 dB LW: 60 dB
FM: 4448V SW: 45dB
SW2: 45 dB SW1: 56 dB
| Signal to noise ration . 2... AM: 40 dB |
FM: 54 dB
Frequency response (0+4 dB)
Cassette section
Circuit system
eo © © © 8# © ££ 28 © ©
Recording system . ceey micas AC Bias (57 kHz)
Erasingsystem .......... AC Erase
F.F.& Rewtime ........ -.90 sec (c-60)
Wow & Flutter ..... .... 0.09% (WRMS)
Frequency response
FS ale yh Gert he te ew Ee Nor.: 100-10 QGOHz
CrO, : 100-12,000Hz
REC/PB a ED ee a OS Nor: 100-8 OOOHz
CrO4: 100-10,000Hz
Signal to Noise ratio
RECIPES 4 ask eae goed 45 de
General
Power output (10% T.H.D.). . .4.5W+4.5W
a ee ee ee AC 220V 50Hz
DC 12V (DM 1.5V x8)
bas cof: a we ea 7IC’s, 37TR’s, 31 Diodes,
Power supply
Semiconductors
aes
—
Sy
wo
oO a. ow
4 LED's
Power consumptions....... 26W |
ORR
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ts
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Woofer
16cm
(3.22);
2
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Weight
.
<
«408
das
4
eed
7.3kg
(without
Batt)
re ey ee ee 520(W)x260(H)x130(D) mm
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IMPORTANT SAFETY NOTICE
Components
of
important
for
safety
are
shaded
on
the
schematic
diagram
and
on
the
replacement
Parts
list.
It
is
essential
that
these
critical
parts
should
be
replaced
with
manufacturer’s
specified
Parts
to
prevent
electrical
shock,
fire,
or
other
hazards.
Do
not
modify
the
original
design
without
permission
of
Gold
Star
Co.,
Ltd.
To the service technician
- a
a The service manual contains detailed service information for Model TSR-580/585.
fe Illustration of the model appears on front cover.
: “a Please give attention to next caution.
oe.
The
followings
are
the
safety
servicing
guidelines
for
all
audio
amplifiers
and
radio
receivers.
:
service
work
should
be
performed
only
after
you
are
familiar
with
all
of
the
following
safety
guide.
oS
To
do
otherwise
increases
the
risk
of
potential
hazards
and
injury
to
the
user.
a
Safety
guide
1.
Be
sure
that
all
components
are
positioned
in
such
a
way
to
avoid
possibility
of
adjacent
components
shorts.
This
is
especially
important
on
those
chassis
which
are
transported
to
and
from
the
repair
shop.
|
2.
Always
replace
all
protective
devices
such
as
insulators
and
barriers
after
working
on
a
receiver.
3.
Check
for
frayed
insulation
on
wires
including
the
AC-cord.
Also
check
across-the-line-components
for
damage
and
replace
if
necessary.
4.
All
fuses
and
certain
resistors
and
capacitors
which
are
the
flameproof
type
must
be
replaced
with
exact
same
types
to
prevent
potential
fire
hazard.
©.
After
re-assembly
of
the
set
always
perform
an
AC-leakage
test
on
the
exposed
metallic
parts
of
the
cabinet
such
as
the
knobs,
antenna
terminal,
etc.
to
be
sure
the
set
is
safe
to
operate
without
danger
of
electrical
shock.
To order repair parts
Part orders must contain
1.
Model
Number
—
found
on
front
cover
in
this
service
manual.
2.
Part
Number,
Description
and
Quantity.
CONTENTS
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SERVICE
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Parts
list
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cabinet
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DIAL CORD ARRANGEMENT
Fig. 1.
Set the varicon to minimum frequency and string the cord by following the number sequence order
as shown in Fig. 1.
ALIGNMENT INSTRUCTIONS
This cassette radio has been aligned at the factory and normally will not require further adjustment.
As a result, it is not recommended that any attempt is made to modificate any circuit. If any paris are
replaced or if anyone tampers with the adjustment, realignment may be necessary.
Test equipment required
1. AM/FM signal generator
2. IF sweep generator (10.7 MHz) for FM
3. 1F sweep generator (455 kHz or 465 kHz) for AM
5. Standard loop antenna for AM
6. VTVM
7. Oscilloscope
8. Frequency counter
9. Audio frequency oscillator
10. Test tapes
a) MTT-144 (10 kHz)
b) MTT-122B (1 kHz)
c) MTT-501 (Blank tape)

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1. CASSETTE ALIGNMENT
Tape head and capstan cleaning
1.
Periodically
clean
the
tape
head,
capstan
drive
shaft
and
other
tape
handling
surfaces
to
insure
proper
tape
handling
and
optimum
frequency
response.
2.
Use
a
cotton
swab
lipped
in
head
cleaner
or
denatured
alcohol
to
clean
all
tape
handling
surfaces.
Wipe
dry.
Tape head demagnetization
When
servicing
tape
unit,
do
not
use
magnetized
screwdrivers
or
wrenches
near
the
tape
head
since
they
can
magnetize
the
head.
=
A
magnetjzed
head
will
result
in
loss
of
high
frequency
response
and
increased
noise.
Head adjustment
Head
adjustment
is
normally
required
when
the
head
is
replaced
or
for
cases
of
cross-talk
and
poor
high frequency response.
Adjustment points
RV102 RV302
UU
LED level
R/P Switch
RV103
Bias Current &)
RV303 &)
» RV301 &)
Rec level
avi01 &)
Bias freq.
AZIMUTH ADJUSTMENT
Fig. 2. AUDIO P.C. BOARD
Test tape
Adjustment
Adjust for
MEAS Maximum
(10kHz)
Azimuth Adjusting
Screw

LED METER ADJUSTMENT
[Lineinjphono. |... y Test
——:
TkHz-
|
Amp.
Flat
Amp.
|
VTVM_
Tape
f
Flat
Amp.
cern
e oom fp LS1e- 6-3
Pee ee oe ee 6
;
Rvi02_
|
Rvi02
|
RV302
RV302
se
MTT-112B
L:
RV102
=
(1kHz)
R:
RV302
Line in
VTVM
RV103
(RV303)
Adjustment
L: RV103
R: RV303
Input Adjust for
No Signal AC 10V +0.5V
* Tape select: Normal
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REC LEVEL ADJUSTMENT
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Mic
Amp.
Flat Amp.
=
60dB
p
p
VTVM
|
Flat
Amp.
l
VIVM
RV101
(RV301)
od
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Peery
4
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es *
1 2 L: RV101
2
REC MODE: AUTO
TAPE SEL.: NOR
R: RV301
; MTT-112B Lower about
(P/B)
(1kHz)
3dB
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Input
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|
No.
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2.RADIO
ALIGNMENT
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AM Alignment Chart
item
TSR-580
(TSR-585)
Dummy
input Output
P : Ant.
Instrument &
Adjustment
Dial Setting Purpose
Frequency Point
Terminal Terminal
AM IF sweep
generator and
Detector Generator Tuning-Gang
Adjust for the scope
output counter-clockwise
(C68)
output
Probe “AY
pattern with specified
oscilloscope
or
(Lowest
freq.)
marker
(IF
freq.)
as
AM
IF
genescope
illustrated
in
fig.
5
(Note 1)
AM SSG Speaker
515kHz (400Hz, 30%
Mod) and VT VM
MW
wave magnet
Tuning-Gang
output counter-clockwise
or detector
ant. (Lowest freq.)
djust for maximum
2
Oscilla-
Adjust
for
ximu
AM
SSG
1650kHz
output
(400Hz, 30% Mod)
and VTVM
_Tuning-Gang gain.
clockwise
(Highest freq.)
Repeat the above item 2-(a), (b) for minimum change.
AM SSG 600kHz
(400Hz, 30% Mod)
. Ct
Speaker
: L4
pik:
MW
ant.
coil
ant. coi
MW
and
VTVM
ant.
terminal
or
3
ail
AM
SSG
1400kH2
detector
None
Tune
to
signal
oe (400Hz, 30% Mod) ecieut | TC3
and VTVM
Repeat the above item 3-(a), (b) for minimum change.
Mw
wave magnet
Adjust for maximum
gain.
AM SSG
150kHz (2.3MHz)
(400Hz, 30% Mod)
LW and VTVM
(SW1)
Oscilla-
Tuning gang fully
counter clockwise L8
Speaker
output (Lowest fre.)
Lw (SW1) terminal
or detector
(7,0MHz) (400Hz, 30% | ant. output
Mod) and VTVM
Adjust for maximum
AM
SSG
350kHz
wave
magnet
None
Tuning
gang
fully
gain.
clockwise
(Highest fre.)
tor
Cc Repeat the above item 4-(a), (b) for minimum change.
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AM Alignment Chart (cont’d)
item
TSR-580
(TSR-585)
Input Output
Instrument &
Frequency
Terminal Terminal
Adjustment | | j - .
Dummy Hieieee) point | : a
Rit: ial Setting TSR-580 Purpose , , : :
(TSR-585) ok
L4 oe
|
LW
ant.
coil
(
oe
(SW,
ant.
coil)
Dea
_ djust for maximum ie.
None
Tune
to
signal
2
OYE,
TC5
os
Repeat the above item 5-(a), (b) for minimum change.
AM
SSG
Tuning
gang
:
pat
ae
6MHz
(7MHz)
i
fully
counter
L9
:
:
—
(400Hz,
30%
Mod)
Sp.
output
SW
clockwise
C
a
oY
o
ane
Ant.
relaes
Bom
(Lowest
fre.)
Adjust
for
maximum
:
ap
Oscilla-
Pe
TC8
”
AM SSG
160kHz (2,7MHz)
(400Hz, 30% Mod)
and VTVM
Speaker
output
terminal
AM SSG
330kHz (6.3MHz)
(400Hz, 30% Mod)
and VTVM ©
te x:
or detector
LW (SW1)
: output
wave magnet
ant.
AM
SSG
input
detector
ant
gain.
output
(Probe
‘“’C’’)
Tuning
gang
fully
clockwise
18MHz (22 MHz)
~(400Mz, 30% Mod)
and
VTVM
(Highest
fre.)
45
SW ant. coil
(SW2 ant. coil)
. Adjust for maximum
Tune
to
signal
,
gain,
TC6
c
|
Repeat
the
above
item
6-(a),
(b)
for
minimum
change.
AM SSG
6.5MHz (8MHz)
(400Hz, 30% Mod)
and VTVM
Speaker
SW
dummy
output
ter. or
AM SSG 16MHz (20MHz)
(400Hz, 30% Mod)
and VT VM
ant.
Pd
(Probe ‘’C’’)
detector
output
BES ATO Oe LE Oe RE SDS TE FR STS Be
Repeat
the
above
item
7-(a),
(b)
for
minimum
change.
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FM Alignment Chart
Instrument &
Frequency
Adjustment
point
Dummy
Input Output Dial Setting
Purpose
Terminal Terminal
FM IF Sweep
Generator and
Generator
Output
Tuning Gang
fully counter-
Adjust for scope
Pattern with specified
EMGIE oscilloscope or Probe “A” clockwise marker (10.7MHz) as
FM IF genescope (Lowest Fre.) illustrated in
Fig. 7 & 8 (note 2, 3)
FM SSG 87MHz Ant. Speaker Generator Tuning Gang Adjust for maximum
(400Hz 22.5kHz Input Output Output fully counter- gain.
Deviation) and | Terminal Probe ‘‘B’’ clock wise
FM VTVM (Lowest fre.)
2 ee FM SSG 109MHz Ant. Speaker Generator Tuning Gang
(400Hz, 22.5kHz Input Output Output fully clockwise Adjust for maximum
Deviation) and Terminal Probe ‘’B’’ (Highest fre.) gain.
VTVM
Repeat the above item 2-(a), (b) for minimum change.
FM SSG
9OMHz (400Hz,
Input Output
22.5kHz Deviation)
and VTVM
Terminal Terminal
FM SSG Ant. Sepaker
fo
3 FM
Tracking
(400Hz, 22.5kHz
Repeat the above item 3-(a), (b) for minimum change.
Ant. Generator
Output
Probe ‘’B”’
Speaker
Tune to signal
4 Adjust for maximum
gain.
Generator
Output
Probe ‘’B”’
Adjust for maximum
Tune to signal TC2 gain,
106MHz Input Output
Terminal Terminal
Deviation) and
VTVM
FM Multiplex Alignment
Frequency counter should read
19 kHz + 0.1 kHz
RV1 (10K-B)
(+) freq. counter
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Note 1.: Adjust T4, T5 and T6 to get maximum gain and symmetry in IF response as shown in Fig. 5.
7
| (a)
JX uN
IF response for weak input signal IF response for strong input signal
After adjust IF response for weak input signal, supply strong input signal and also adjust T4, T5 and T6 to makepart
(a) flat as shown in Fig. 6.
Note
2.:
Adjust
output
of
sweep
generator
so
that
noise
appears
on
|F-curve
as
shown
in
Fig.
7
below
and
adjust
T1 and T2 for maximum indication. |
Note
3.:
Adjust
T3
to
be
|F-curve
into
S-curve
(See
Fig.
8)
and
adjust
T3
so
that
declined
part
of
S-curve
has
to
be
just linear.
If
ceramic
filter
is
used
in
RF
part,
adjust
T3
so
that
part
(A)
and
part
(B)
are
symmetrical
on
either
side
of
vertical
line, because the marker of 10.7MHz on sweep generator is not on the center of S-curve.
Fig.
7
Fig.
8
PROBE
“A”
iueaieteetetnbetetetnaetetentententete
|
PROBE
''B”’
|
CG
eae
et
OE
Gey
eng
ne
ea
ee
ee
it
aa ie a ee al
Rg: FM SSG Output
Ri: 75-9
2