Goldstar GSA-3040 User manual

Gold Star Audio
SERVICE MANUAL
for
service
technician
Gold Star Co.,Ltd.
=
:
STEREO
POWER
AMPLIFIER
Slim
type
component
series
SPECIFICATIONS
This specifications may be changed for improvement of performance without notice.
VUE Cs as 2, cies eca tetas hee alee a iv ae ee cae 2 RMS 25W
TD: (2060-20000 AZ) ed wade Oe ee tweed 0.02%
Frequency response .......... 000 eee eens 20-20000 Hz
Signal to noise ratio ....... ee re eee 75dB
(NOISE! o..5 Bo, 3. te ett eee tae dyes dy Bp Se ees Bw hg oe 0.4 mV
Power indicator range .............0.0000008 0.002-50W
Input sensitivity/impedance
MGAVACKS iy x. 6 al OS neat aa We Wile oe Bit he 500 mV/47kQ
DIN SOCKEE a: cto EA ee ab Re ise ioaee 500 mV/47kQ
K@aG MPCOGICE yn. aS 4! does. gence aa ee ae 8 ohm
Seimi-COndUCIONS:. 2 ewan ow attend tae be 3IC, 4TR, 8DIODE, 24 LED
Power consumption ..............0. 000000. 130 W (Max.)
WEIGAG a24.3 3 os $a ee ee oe ae Vee ere 5.2 Kg
ED PICUIS ONG scsi. hs tts ect ed os Su eee 420(W) x 55(H) x 269(D) mm
Printed in Korea Apr., 19&2

EXPLODED VIEW FOR CABINET
To service technician
This service manual contains detailed service information for stereo power amplifier, Model GSA-3040
Illustration of the model appears on front cover.
Please give attention to next caution.
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.
To do otherwise increase the risk of potential hazards and injury to the user.
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.
Always replace all protective devices such as insulators and barriers after working on a receiver.
Check for frayed insulation on wires including the AC cord. Also check across the line conponents
for damage and replace if necessary.
. All fuses and certain resistors and capacitors which are of 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, switch, etc. to be sure the set is safe to operate without danger ofelectrical
shock.
To order repair parts
Parts orders must contain:
1. Model Number-found on front cover in this service manual.
2. Part Number, Description and Quantity.
CONTENTS
Disassembly instructions .. 0.0.0.0... 000 en ey 2
Power level adjustment ........ SS shi tee Be tay Se cacti Fic GEE Bl BS aah acon tgs een hc hee tes aoe he eae ead 2
PO Ck Cl aQ hal) Weg sm tive Pack hte, & Spc ewce ch dys SIs Bee wie ak Sats ee Soe Gn ee ane me 3
SCHEMALCCIAQNaNNs 3. cecnassin te oto. ots en ethk & Mum ty G Sm er Syteis Stach, bead ar IS eae ates 4,5
Electrical parts location and wiring ... 2.0.0... ee, 6,7
PVECERICAIP OTS ISU: se whoa 5. aera ste peste Beh ponte Sie tide, Soop. ck ot pele SS op dh bn Be edn ert de de Docket dette he ead .,, 8,9
Exploded view for cabinet ... 0.0.0.0. 00. ee eee 10, 11
Parts list for cabinet exploded view ........... 00000 cbc bb bbe eee 12

DISASSEMBLY INSTRUCTIONS
1. To remove top cabinet
Remove four screws €) as shown in Fig. 1.
Fig. 1
2. To remove front panel
When
replacing
parts
situated
on
the
front
panel
such
as
the
power
switch,
speaker
buttons,
etc.,
remove six screws (8B) and © . (See Fig. 2& 3)
Fig. 3
POWER
LEVEL
ADJUSTMENT
This
stereo
power
amplifier
has
been
aligned
at
the
factory
and
normally
will
not
require
further
adjust-
ment.
As
a
result,
it
is
not
recommended
that
any
attempt
is
made
to
modificate
any
circult.
If
any
Parts
are
replaced
or
if
anyone
tampers
with
the
adjustments,
realignment
may
be
necessary.
, 1 kHz More than
500mV 14.2V
1 kHz AF OSC
2 2V se
500mV-20dBm output
LED level meter
VR101(L)
VR102(R)
shou Id read
0.5W
LED level meter

IN PUT
POWER
AMPLIFIER
>
=>
C) OUTPUT
AC-DC
CONVERTER
WU UM UU NUN A a
POWER LEVEL DISPLAY
POWER SWITCH
POWER TRANS 2P
SOCKET
WVYOVIG NIO 1d

L- INPUT
R- INPUT
()-------+6)-----—+
SCHEMATIC DIAGRAM
TR I0l TR 102 TRIOS
MPS 9434G MPS 9630K MPS 9630K
HEAD PHONE
JACK
STK - 461
ic 101
L202 RI02
|
|
S.P
A
|
|
LO ch S.P B
| TRIO4 SN
Geer 2S$1827-0 oF
| R105 aaaG
| IK
|
|
| C124. 125.126.127 :
| 0.047/500V
|
C123:4700
MF-35V
rea
INAL A
Nl
ISIBBFM-
2x2
1?
R120
Is
188F
M-2x2
| R124 RI2
| 56k DIOS sek DIO?
7
She
VRIO2
ACII6
4.7/25
VRIOI
f
ACIS
4.7/25
ioe
io
cS
GG
SPEAKER
a
a
4a7k>
scis
ADIO6
47
eee
DIOS
TERMINAL
B
4.7/25
eae eee Cem Qe (mam ene cnene anes comm comme amen cue cou qupersm ea ome ames cous ome Q) ee cums am Game Gomme GED GERED GED GED GaED CUED eS ereED GoD GEE Gu eee oo ome | 200PX4
> =D om e Pe a, ee ee a ee ee ee ee gen ee tes ey ee
R204
56K
H—,, SW eisrtertedsy tere tort
16.8 [7.7 [92 l1o.7/7.7 [9.20 |io7Jo
THIS SCHEMATIC DIAGRAM MAY BE CHANGED FOR IMPROVEMENT OF PERFORMANCE WITHOUT NOTICE.

ELECTRICAL PARTS LOCATION AND WIRING
Circuity pattern and printing may be made a little of difference with the set under service. Please make
sure of them when servicing.
MAIN
AMP
PWB
AY
(51
1-497A)
f
secaiei
visnibioinconebtin
1
a
_
_
|
sqvesesi
‘
sein
| |
pcossseinssisasanamcamiansaiis
¢
ia
sain
¢
jpprcnonicasiacasttiag
Aone
singer. |
SES ces S ERE ONES ROSES
from G
POWER AMP
PWB E
a eS
oS
T T8-498A
GOLD STAR >
suas sia iS eae SSE ape RRR cme RESO
to R.ch
HEADPHONE
POWER AMP
| | PWB
S.Pter.A
L.ch) fo 2
R ch S.P ter. B
TRi02
LEVEL METER PWB AY (511-498A)
2: a
2 7 RCA or DIN JACK
es ped cup} R-ch
to
RCA or DIN JACK *°
RO
L.ch IN
to
S.P SEL. SW
PWB
LO
to
POWER TRANS
2ND
to POWER TRANS
2ND GND
to HEAD PHONE
JACK GND
G
RI
LI
A (=) (+) B
to
LEVEL PWB
to SP ter. |
GND 8
(CHEMICON )

ELECTRICAL PARTS LOCATION AND WIRING
Circuity
pattern
and
printing
may
be
made
a
little
of
difference
with
the
set
under
service.
Please
make
sure
of
them
when servicing.
MAIN AMP PWB AY (511-497A)
PiaRS Si RNR eases!
from G
POWER AMP
PWB E
GOLD STAR
to
R.ch
a
HEADPHONE
d
JACKS
A
ey,
ese
;
S.Pter.A 4 POWER AMP
, | PWB
L.ch) fo 2
R ch S.P ter. B
fae epee ea oo
! ae c 101 Ca Cb C 182
BS a | RT a eae
LEVEL METER PWB AY (511-498A) ELE! es, ise get Le
Sar, Sos geee |" 272 2S, 7
| xz ee . 7 BA - aon or DIN JACK
RCA or DIN JACK | GND , ° eno) ®t
ria IN Fioz 1 SOR AD ae
ANA f as SEL. SW
F101 FT 315A 7 PWB
ASS
ce LO
to
POWER TRANS
2ND
to POWER TRANS |
2ND GND -
to HEAD PHONE saa “es
JACK
GND
-,|
LEVEL
PwB
to S.P ter. A ~ oe 4
GND 5
(CHEMICON )

MAIN AMP PWB AY (511-497A)
NO.
op WN =
o>)
14
15
16
17
18
19
20
21
22
SYMBOL NO. PART NO.
IC101 668-134A
TR104 665-882B
0101 652-611A
D104 654-6078
D105, 106, 107
108
F101, 102, 103
104
VR 101, 102
R125
R132, 133
R113, 114,115
116
R117, 118
R123, 124
R105, 106
R107, 108, 119,
120, 121, 122
R101, 102
R109, 110
R126
R103, 104,111,
112
R127
65 1-001C
586-101A
585-116B
613-002F
56 1-009D
564-022A
RN 101501
RS102K07
RSR47J01
RD4R7J09
RD562J09
RD621J09
RD102J09
RD822J02
RD332J09
RD472J09
RD333J09
RD2I227IN9
ELECTRICAL PARTS LIST
DESCRIPTION
IC STK-463 (AUDIO)
TRANSISTOR SANKEN 28C1827-0
DIODE RECT KBRC604G, 1}
DIODE, ZENER, ZPD-13, ITT
DIODE DETECT 18188FM-2
FUSE HOLDER KS CLIP TYPE 5x20
FUSE 5x20 SEMKO 250V 3.15A SLO
VR,SEMI-FIXED SR19R-10KB 10D
CONNECTOR MALE, 4PIN
PLUG AY, 12 PIN.
R,METAL FILM 100-J1/2WP
R,METAL, OXIDE 1K—K 2WP
R, METAL OXIDE 0.47-J1/2WP
, CARBON FILM 4.7-51/4WM
» CARBON FILM 5.6KJ1/4WM
, CARBON FILM 620 5% 1/4W
,CARBON FILM 1K-J1/4WM
ss ee” 0 ee 5 eee 8
CARBON FILM 8.2K J1/4WR
/CARBON FILM 3.3K-J1/4WM
, CARBON FILM 4.7K-J1/4WM
_CARBON FILM 33K.J1/4WM
0 ee eee Yee 2
R. CARBON FILM 2.9K 11/A\WIM
SYMBOL NO. PART NO.
R130
R129, 131
C109, 110
C103, 104,
130
Citi,
C124,
127
C115,
118
C105,
C107,
C101, 102
C113, 114,
C119, 122
C123
Ci21
FOR POWER IC
FOR
REGULATOR
TR101
RD124J09
RD154J09
CCO80D06
CC471J501
112
125,
CK473Z202
CO 104501
126,
116,117, CE475D01
~CE107D01
CE476E01
CE 105F 01
CE106F01
CE107F01
CE478E12
CE227B01
255-073B
25-610A
106
108
662-0254
TR102, 103 662-024F
D102, 103 652-005A
C201, 202 639-602H
C131,.132, 133, CC201501
134
636-403A
DESCRIPTION
, CARBON FILM 120KJ1/4WM
,CARBON FILM 150KJ41/4WM
, CERAMIC CC 8PF-D CH 50V
,CERAMIC CC 470PF-J SL 50V O°): De
O
»CERAMIC CKO0.047MF-Z 50V
C, POLYESTER 0.1MF-J 50V
O
»,ELECTROLYTIC 4.7MF 25V
»~ELECTROLYTIC 100MF 25V
»ELECTROLYTIC 47MF 35V
»,ELECTROLYTIC IMF 50V
»,ELECTROLYTIC 10MF 50V
»,ELECTROLYTIC 100MF 50V
,ELECTROLYTIC 4700MF-35V
»ELECTROLYTIC 220MF 10V
PLATE HEAT SINK (A)
PLATE, HEAT SINK (B)
Cy €) 030) O07)
TRANSISTOR , MOTOROLA, MPS9434G
TRANSISTOR MOTUROLA MPS9630K
DIODE RECT 1N4001G, |
COIL PEAKING 5.6MH
C, CERAMIC CC 200PF-J SL 50V
COIL CHOKE

LEVEL METER PWB AY (511-498A) SP SELECTOR SW PWB AY (511-499A)
SYMBOL NO. PART NO. DESCRIPTION
SYMBOL NO PART NO. DESCRIPTION
C201, 202 668-133A IC IR2431 (LED DRIVER) 1 554-606G SW, PUSH SUF24N 2Cx4
563-614F CONNECTOR AY MOLEX 4P 2 RS221J07 R,METAL OXIDE 5% 2W 220
653-402B LED SENIOR SE-6611-H GN
653-402A LED SENIOR SE -6611-H RD
R201 RD222J09 R, CARBON FILM 2.2K -J1/4WM
R202 RD123J09 R, CARBON FILM 12K J71/4WM
R203, 204 RD823J09 R,CARBON FILM 82K-J1/4WM

EXPLODED VIEW FOR CABINET
—11—
— 10 —