Download SP-012 Service Manual

SP-012 Service Manual
SP-012 Principle and Servicing
1. SP-012 working principle
Signals are inputted to input board through SC1. The left channel signal arrives at pin 3 of socket
XS1 through R13, and then at power amplifier board through flat cable XP1 and then divides into two
paths after arriving at power amplifier board: one path arrives at potentiometer S2 through R2 for bass
adjustment (S2 is duplex potentiometer and can adjust left and right channels at the same time); the
other path arrives at potentiometer S1 through C21 for tweeter adjustment (S1 is duplex potentiometer
and can adjust left and right channels at the same time); after bass and tweeter adjustment, the two
paths combines into one path through balance resistor R3, R5 and send to potentiometer S3 for volume
adjustment (S3 is duplex potentiometer and can adjust left and right channels). After volume adjustment,
signals are sent to pin 2 of U1LA4508 after R12 damping and C1 coupling for power amplifying (LA4508
a dual-channel power IC with fixed amplifying ratio), and outputted through pin 4 after amplifying; output
signals are sent to speaker directly after DC filtering. Signal flow direction of right channel is the same
as that of left channel/.
2. Introduction to LA4508:
Output power: 22W 2
Power supply voltage: 22V
Pin 2, 13: signal input pin
Pin 4, 11: signal output pin
Pin 6, 9: bootstrap capacitor input pin
3. Troubleshooting flow
(1) Troubleshooting flow for “Left channel has no output” os shown as the following figure 3.1:
Left channel has no output
Check
whether pin 1
(or 3) of power amplifier
board Xp1 has wave form
after signal is
inputted
N
Y
Check
whether the
anode wave form of
capacitor C1 (or C3)
is normal
Y
N
Check
whether the
anode wave form of
capacitor C12 (or C14)
is normal
Y
N
Change S3
Change U1
Change R13 and R14
N
Change input terminal
Figure 3.1 Troubleshooting flow for “Left channel has no output”
-1-
Change capacitor (C16)
(2) Troubleshooting flow chart for “Power not on” is shown as the following figure 3.2:
Power not on
Check
whether protector
tube on power cord
has been burnt
down
N
Y
Check
whether protector
tube of power amplifier
board FL402 has been
burnt down
N
Check
whether the power,
voltage of power amplifier
board is 22V
Y
Change C17
and C11 to solve
Check
whether protector
tube of power amplifier
board FL402 has been
burnt down
N
Change transformer and
protector tube to solve
Y
Check
whether the
impedance of power
amplifier board power board
and grounding wire
is zero
Y
Change U1, transformer
and protector tube to solve
Figure 3.2 Troubleshooting flow chart for "Power not on”
4. Signal waveform diagram
(1) Input waveform diagram of pin 2 of U1
-2-
N
Change U1 to solve
(2) XS4 output signal waveform diagram
(3) External input signal waveform diagram
-3-
5. circuit diagram
C23
S2
B50K
S1
B50K
1.2K
2
C2
331
1
14
IN1
C20
R4
5.6K
S2
B50K
R6
4
GND
C8
103
2CP
LLS
SPEAKER
RHS
9
10
DS2
2CP
C14
1000u/16V
TREBLE
3.3K R13
100K R14
100K R15
R IN
3
2
1
3CP
RL245
VD2
22V
C17
2200uF/25V
RL245
VD1
VD3 RL245
VD4
SC1
SC1
R OUT
XP1
3.3K R16
RL245
XP7
1
2
2CP
F402
1
2
T3.15A/250V
C13
224
XS2
~17V
~0V
2CP
C15
RLS
SPEAKER
XS5
473
C6
100u/25V
R17
SC1
SPEAKER
1
2
R IN
GND
3.9K
L IN
C27
3.3u/50V
XP5
C19
562
R8
5.6K
C26
3.3u/50V
22V
S1
B50K
1.2K
1
2
GND
C5
100u/25V
56K
XP4
7
BOOT2
OUT2
IN2
FB2
C4
331
LHS
SPEAKER
2CP
L IN
11
R11
R9
75K
562
563
C24
8
VCC
12
S3 B50K
C3
10u/16V
L OUT
GND
6
GND
13
3.9K
R1
5.6K
5
DS1
DECOUP BOOT1
R18
3CP
1
2
LA4508
U1
100u/25V
C11
C12
1000u/16V
C16
473
C9
100u/25V
3
VD5
1N4004
C18
562
R7
5.6K
BASS
XP1
5.6K
R5
R10
75K
C10
100u/25V
OUT1
R3
3
2
1
XS4
22V
TREBLE
C21
562
BASS
563
C1
10u/16V
56K
FB1
R2
5.6K
2
1
GND
R OUT
2CP
-4-
S3
B50K R12
XS2
R OUT
C13
XS5
C8
VD4
C14
C2
R7
R1
R8 R10
R5 R12
R17
R18
R3 R9
C3
R6
R21
C20
C21
C1
W7
R2
C19
R15
VD3
4501-2
CJX
2002-07-19
R13
R14
C7
FL402 T3.15AL250V
L IN
GND XP1
R IN
C23
LOUT
GND
ROUT
C16
GND
~17V
LOUT
C15
C17
VD1
C22
GND
XP5
XS1
VD2
~17V
R4
C5 C6
R11
C4
W1
S1
S2
3mm
-5-
S3
R20
R16
C12
GND
7501-1 CJX
2002-5-29
C18
XC1
L OUT
6. PCB Board
XS4
C10
C9
W5
W6
W3
W2
U1
W4
C11
VD5
7. BOM LIST
MATERIAL CODE
MATERIAL NAME
SPECIFICATIONS
LOCATION
AMPLIFIER BOARD
2100003
CONNECTED CORDS
F0.6 SHAPED 7.5mm
W1,W5,W6
2100004
CONNECTED CORDS
F0.6 SHAPED 10mm
W3
2100006
CONNECTION CORDS
F0.6 SHAPED 12.5mm
W7
2100017
CONNECTED CORDS
F0.6 SHAPED 20mm
W2
0000229
CARBON FILM RESISTOR
1/4W43K±5%
R20,R21
0000288
CARBON FILM RESISTOR
1/4W3.9K±5% SHAPED 10
R17,R18
0000291
CARBON FILM RESISTOR
1/4W5.6K±5% SHAPED 10
R1,R2,R3,R4,R7,R8
0000281
CARBON FILM RESISTOR
1/4W680O±5% SHAPED 10
R11,R12
0000304
CARBON FILM RESISTOR
1/4W75K±5% SHAPED 10
R9,R10
0000361
CARBON FILM RESISTOR
1/4W1.2K±5% SHAPED 10
R5,R6
0210014
TERYLENE CAPACITOR
100V 103 ±10% 3.5mm
C7,C8
0210031
TERYLENE CAPACITOR
100V 224 ±10% 8mm
C13,C15,C16
0210056
TERYLENE CAPACITOR
50V 563 ±20% 6mm
C23,C22
0210065
TERYLENE CAPACITOR
100V 562 ±5% 3.5mm
C18,C19,C20,C21
0200111
PORCELAIN CAPACITOR
50V 331 ±10% 5mm
C2,C4
0260303
CD
CD11 16V2200u±20 ％10×30 5
C12,C14
0260460
CD
CD11 16V2200U±20%12×25 5
C12,C14
0260036
CD
CD11 25V10U±20%5×11 2
C1,C3
0260041
CD
CD11 25V220U±20%8×12 3.5
C11
0260104
CD
CD110 25V 100UF ±20% 6×12 2.5
C5,C6,C9,C10
0260227
CD
CD11 25V2200U±20%16×18 7.5
C17
0260173
CD
CD11 25V2200U±20%16×25 7.5
C17
0880904
IC
LA4508 ZIP
U1
0570019
DIODE
RL254
VD1~VD4
0160035
ROTATED POTENTIOMETER
D161GOAX-V1B503-016
S1,S2
0160036
ROTATED POTENTIOMETER
D161GOAX-V1B503-017
S3
1940001
SOCKET
2P 2.5mm
XS2,XS4
2150106
FLAT CABLE
3P90 2.5 2 PIN, 2P SHIELD,WITH NEEDLE
XS1~XP1
2110322
DUAL-CORD
20# 280mm RED BLACK
XS5
2300004
FUSE
T3.15AL 250V
F402
3870057
FUSE HOLDER
0
F402
-6-
MATERIAL CODE
1562078
MATERIAL NAME
PCB
SPECIFICATIONS
LOCATION
4501－2
INPUT OUTPUT BOARD
0000287
CARBON FILM RESISTOR
1/4W3.3K±5% SHAPED 10
R13,R16
0000305
CARBON FILM RESISTOR
1/4W100K±5% SHAPED 10
R14,R15
2120622
FLAT CABLE
2P140 2.5 2 SOCKET WITH NEEDLE
XS4~XP4
1940002
SOCKET
3P 2.5mm
XS1
1910045
TERMINAL SOCKET
AV3-8.4-2
XC1
1562077
PCB
7501－1
-7-
AMPLIFIER UNIT
MATERIAL NAME
SPECIFICATIONS
AMPLIFIER UNIT
3871871
REAR BOARD
SP-012(RU)
200378
CERAMIC CAPACITOR
@400VAC 472 ±10% 10mm VDE
1350083
POWER SUPPLY SWITCH
@PS8-11-C-048B/BH VDE
460168
TRANSFORMER
SP-10
2140347
POWER SUPPLY CORD EUROPE SPECS
@2P 1.9m 2.5A MA-800S VDE
3580057
HEAT RADIATION BOARD
40×70×10.5 BSY01
4000216
SELF-TAPPING SCREW
PB 3×6H COLOR ZINC
4000221
SELF-TAPPING SCREW
PB 3×13H COLOR ZINC
4210019
MACHINE-TAPPING SCREW
PWM 4×12×9 COLOR ZINC
4400002
NUT
M4
4400028
NUT OF POTENTIOMETER
M7
3022122
ADJUST BUTTON
BSD02 BLACK
4660010
INVERTED TUBE
F31×F34×65 2#
3540053
SCREEN-SHIELDED PIECE
SP501
4450032
ROUND PAD
F7×12×0.5
4450014
BOLT PAD
F4×10×0.8
4450015
BOLT PAD
F8×15×2
4450017
BOLT PAD
f 8×15×1.0
4490002
SPRING PAD
F4
5234967
PYROCONDENSATION SET DIPE
@F3 UL
5234966
PYROCONDENSATION SET DIPE
@F4 UL
5233838
PYROCONDENSATION SLEEVE
@F22 UL
5231427
UPRIGHT AIRPROOF STRIP
179.4×7×1.5 SPONGE
5231428
HORIZONTAL AIRPROOF STRIP
114.5×9×1.5 SPONGE
5231476
SOFT SPONGE SPACER
30×25×2 SINGLE-FACED,HARD
2300052
FUSE
@T315MAL 250V VDE
5230713
NYLON BANDAGE
80mm
5180145
NOT DMETAL OXIDE FILM RESISTOR GLUE LABELL
FUZE FL T315mAL 250V
5448090
PCB SEMI-FINISHED PRODUCT
4501-2 SP-012(RU)
5448091
PCB SEMI-FINISHED PRODUCT
7501-1 SP-012(RU)
SPEAKER BODY WITH FOAM
3080497
SPEAKER BODY
SP-012(RU) MAIN, SHALLOW TIMBER
GRAIN
3080498
SPEAKER BODY
SP-012(RU) SUBSIDIARY ，SHALLOW
TIMBER GRAIN
-8-
AMPLIFIER UNIT
MATERIAL NAME
SPECIFICATIONS
5041046
FOAM
FM-010122
4660007
INVERTED TUBE
F31×F34×65
5233951
PVC PEEL
P21010-01
PANEL
3060534
PVC SCUTCHEON
BBK SILVER FUNDUS,GREY FUNDUS 46
×8
5234926
SOFT SPONGE SPACER
340×1.8×2 WHITE SINGLE-FACED SOFT
ASSEMBLY
3004300
PANEL
SP-012(RU) WHITE
4710200
BACKBOARD
5234927
FOOT
260531
NPCD
CD70 50V2.2U±10% DF ≤10% 8×17
1100603
LOUDHAILER
SD0421YF SP-012(RU)
1100604
LOUDHAILER
SG0153YF SP-012(RU)
2110233
DUAL-CORD
20# 170mm YELLOW BLACK
2110322
DUAL-CORD
20# 280mm RED BLACK
1910050
TERMINAL SOCKET
AV1-8.4-6
3080499
SPEAKER BODY WITH FOAM
SP-012(RU) SHALLOW TIMBER GRAIN
4000782
SELF-TAPPING SCREW
PWB 3×12×10H COLOR ZINC
4000783
SELF-TAPPING SCREW
PA 4×18H WHITE NICKEL
4000289
SELF-TAPPING SCREW
PWA 3×16×7 WHITE NICKEL
4000204
SELF-TAPPING SCREW
PWA 3×10×7 NICKEL
4000191
SELF-TAPPING SCREW
PA 4×15 BLACK
5462277
AMPLIFIER UNIT
SP-012(RU)
SP-012(RU) SUBSIDIARY ，SHALLOW
TIMBER GRAIN
F20×7 SILICA GEL(HALF BALL/T4000
GLUE)
PACKAGE MATERIAL
2160136
AV CORD
1.2M AUDIO FREQUENCY
2160013
AV CORD
1.5m AUDIO FREQUENCY, DUAL HEAD
2160017
AV CORD
1mAUDIO FREQUENCY,DUAL HEAD
WITHF3.5 EARPHONE HEAD
5003004
CARTON BOX
633×390×316 SP-012(RU)
5013674
GIFT BOX
SP-012
5070046
HANDLED RING
AB001
5070048
HANDLED GASKET
AB001
5070680
SELF-SEALED GLUE BAG FOR ENVIRONMENTAL PROTECTION
180×250×0.05 PE
(WORNING)
5071224
GLUE BAG FOR ENVIRONMENTAL PROTECTION（WITH HOLE）
-9-
380×400×0.05 PE ENGLISH
AMPLIFIER UNIT
MATERIAL NAME
SPECIFICATIONS
5142076
SN LABELL
CURRENCY FOR RUSSIA
5194612
USER MANUAL
SP-012 ENGLISH/RUSSIT
5210522
WARRANTY CARD
RUSSIA 210×295 RUSSIT
5780251
SPEAKER
SP-012(RU) SHALLOW TREE VEINS
SN LASEL
5142067
SN LABELL
RUSSIA
WITHOUT BAR CODE NUMBER
SUPPLEMENT MODULE
5110002
ELECTRO WELDING WIRE
F1.0
5110018
ELECTRO WELDING WIRE
f 2.0
5110004
ADHESIVE TAPE
5110003
ELECTRO WELDING WIRE
5120096
PEANUT OIL
5120001
THINNER
5120004
SOLDERING FLUX
5120011
WIPING WATER
5120012
RED GLUEWATER
5120332
SILICONE GREASE HEAT CONDUCT OIL
GB-304
5120067
GLUEWATER
502
5230021
SCOTCH TAPE
12mm
5230022
SEALING PAPER
COLORLESS
5231514
HIGH TEMPERATURE MASKING PAPER
LENGTH:15 YARD WIDTH:20mm
5231454
HIGH TEMPERATURE MASKING PAPER
LENGTH:15 YARD
WIDTH:6mm
5231455
HIGH TEMPERATURE MASKING PAPER
LENGTH:15 YARD
WIDTH:12mm
5231456
HIGH TEMPERATURE MASKING PAPER
LENGTH:15 YARD
WIDTH:24mm
5120009
WHITE PRESSURE OIL
5230020
MASKING PAPER
24mm
5280353
SILVER LACQUER PEN
SILVER WHITE
2100002
CONNECTION CORDS
F0.6
- 10 -