Alto SR500A User manual

Service Manual
ALTO
REV.2
Model: SR500A

CONTENTS
1.Specifications
2.Block Diagram
3.Schematic Diagram
4.Printed Circuit Board
5.Test Procedures
6.Structural Drawing
7.Exploded View & Mechanical Parts List
8.Electrical Parts List

Test Result
Model No: SR500A Test Date:20050711 Tester: MO GUO ZHU
Test Item Test Conditions Spec Test Result Remark
1 Power Source AC: 230V；50 Hz
2 Idle Current AC 230 V No-Load 5 ±0.5 mV mV across R26 &R24
3 Power
Consumption
Rated Output.
Aux At 1KHz A WA W
FLAT
4 Rated Output Lo
w Load
:4Ω 34~36V THD:0.25↓V
Hi Load
:8Ω 19~20V THD:0.3↓_______V
Load 16Ω V_______V
Load ____Ω （25V ） VV
Load____Ω （50V ） VV
Load____Ω （70V ） VV
Load____Ω （100V ） VV
Aux At 1KHz FLAT.
Rated W
5 Maximum at
Output 10% THD
Aux 1KHz dB
Load Ω WWFLAT
7 Hum or Noise VR Max （Low ） 25↓ mV mV DSP OFF
VR Max（Hi ） 20↓ mV mV DSP OFF
8
100HZ:
dB 100HZ: dB
Tone control
Response Input From Aux Output At 1W 10KHZ: dB 10KHZ: dB
9 Puncture Voltage 5mA ， 5Sec 3750V V
10 MONITOR Aux 1KHz dB Load Ω FLAT
MONITOR NO: AUX,TAPE,TUNER,CD,MIC1,MIC2
CD PLAYER 1KHz 0dB
TUNER AM/FM
PRIORITY MIC1
TEL.PAGING 1KHz____dB
Load____Ω_______V
G-T___dB；
G-R___dB。
G-T___dB；G-R___dB。 FLAT
ZONE PAGING 100V ALL/ Z1，
Z2，Z3，Z4
AC : OUTPUT
REMOTE AC OUT or DC OUT
01-1

Test Result
Model No：SR500A Test Date: 20050711 Tester：MO GUO ZHU
Test Item 1. Input
Sensitivity 2. Signal/Noise 3. Distortion at 1W 4. Distortion at Rated 5. Frequency Response
Test Conditions
Test Result
FLAT Rated
Output 36V/20V
Load 4 Ω
FLAT Rated
Output 36V/20V
Load 4Ω
FLAT Output
at 2V Load 4Ω
FLAT Rated
Output 36V
Load 4 Ω
FLAT Output at
2V Load 4Ω
Low OUT -3±0.5dBV 80↑ dB 0.8↓% 0.5↓%
Hi OUT 0.5±0.3dBV 80↑ dB 0.5↓% 0.1↓%
TUNER dB dB % %
LINE
CD dB dB % %
AUX dB dB % %
TAPE dB dB % %
TUNER dB dB % %
AUX2
CD dB dB % %
AUX dB dB % %
TAPE dB dB % %
TUNER dB dB % %
AUX3
CD dB dB % %
LOW -44 ±0.5dBV 60↑ dB 2↓ % 0.5 ↓%
HI -44 ±2dBV 60 ↑dB 2↓ % 0.3 ↓%
24V dB dB % %
MIC
UNBAL dB dB % %
MIC dB dB % %
LINE dB dB % %
24V dB dB % %
MIC-2
UNBAL dB dB % %
MIC dB dB % %
LINE dB dB % %
24V dB dB % %
MIC-3
UNBAL dB dB % %
MIC dB dB % %
LINE dB dB % %
24V dB dB % %
MIC-4
UNBAL dB dB % %
Remark
1.When the above item are tested, short-circuit the row pin of 1, 2 pin of 313115-1(DSP board)CN1. After
test, remove the short circuit terminal.
2.Load connection: connect 4Ohm load to LOW output, and 8Ohm to Hi output.
3.Please check if bass BOOST circuit is normal. When the bass output is below 17V(ON LOAD),BOOST
circuit does not operate. When the bass output is above 17V(ON LOAD), BOOST circuit starts to operate.
Authorization by：Check by：
01-2

1234
A B C D
4
321
D
C B A
POWER SWITCH
MIX AMP PRE AMP
HI PRE LOW PRE LOW POWER
HI POWER
AMP
AMP
AMP AMP
LOW
V+ & V- V+ & V-
HI
POWER SUPPLY SWITCH
LOW SPEAKER HI SPEAKER
LOW V+
LOW V-
HI V- HI V+
AC INPUT
238094
DSP MODULE
HPF LPF
Title Size:
A3
Number
Date: File: Sheet of:
Drawn By:
Revision
SR500A
SR500A
1/1
MO GUO ZHU
VER1.0
1
第版
SR500A BLOCK DIAGRAM
SIGNAL INPUT
VOLUME
130 deg SW
T6.3A
T6.3A
T6.3A T6.3A
LINE IN
02-1

12345678
A
B
C
D
8
7654321
D
C
B
A
2
1
3
4
MIC2
CN-BAL-MALE
ZD5
12V1W
ZD2
12V1W
ZD4
12V1W
ZD3
12V1W
R16
15K
R19
15K
R18
15K
R15
15K
R14
390E
1
2
3
+
_IC3A
33079 7
6
5+
_IC3B
33079
8
9
10 +
_
IC3C
33079
14
13
12 +
_
IC3D
33079
C23
22P
C20
22P
C19
22P
C26
22P
C27
0.01uF/400V
R22
10E
1
2
3
SW2A
SW PS-22E85L
4
5
6
P
SW2B
SW PS-22E85L
GND
1
2
3VR1
D50K
R17
4.7K
R21
820E
8
9
10 +
_IC1C
33079
C16
0.0033u
R12
10K
R10
10K
7
6
5+
_IC1B
33079
C5
0.0033u
R7
10K
R2
10K
R11
6K8
R1
6K8
C21
47u/63V
C22
47u/63V
C2
47u/63V
C1
47u/63V
1 2
3 4
5 6
7 8
910
1112
1314
1516
1718
1920
CN2
CN-10PX2-180
12
34
56
78
910
1112
1314
CN1
CN-7PX2-F
C17
47u/63V
1
2
3
+
_IC1A
33079
C7
22P
R4
10K
R5
10K
C6
0.0033u
R3
6K8
14
13
12 +
_
IC3D
33079
1
3
2
DL1
SIGN/LIMIT
R9
1K2
+15V
-15V
+5VD
+15V
-15V
NC 1
OUT 2
NC 3
GND
4GND 5
NC 6
V+ 7
NC 8 NC 9
FB
10
FC
11
GND
12 GND 13
OSC
14
SS
15
NC 16
IC2
L4962
C4
220u/63V
C9 330P
C12
0.0022u
R8
3K9
R6
15K
C8
0.033u
C13
2u2 100V
4
3
2
1
5
L1
TP-SEV1924-03
C25 470u/25V SLL* C24
1000u/6V3
+5VD
D1
BYV27
R13 330E
11 4
IC1E
33079
11 4
IC3E
33079
C14
470u/25V SLL
C10
470u/25V SLL
C15
0.1u
C11
0.1u
+15V
-15V
CLIP
SIGNAL
R
G
X1X2
X3
1
2
3
4
5
6
MIC1
XLR
+5VA
HIGH
LOW
HIGH INPUT
+4dB
L2
FL5R
L3
FL5R C28
10u/63V
C18
10u/63V
C29
10u/63V
Title
Size:
A3
Number
Date:
File: Sheet of: Drawn By:
Revision
SR400A-PRE
P-110018-SR400A
2003/12/10
PS 4HA 1/1 Lian Ming Tan
VER1.0
TO 313120-1 AMP PCB
1第版
1
2
3
4
5
6
7
SW1
VR-SW
03-1

1 2 3 4 5 6 78
A
B
C
D
8
7654321
D
C
B
A
R38
390E
R44
1K
R49
68K
R50
4K7
R51
12K
R42
470E
R34
820E R35
68E
R33
12K
R32
8K2
R63
8K2
R62
47E
R64
47K
R65
2K2
R66
1K
R43
12K
R29
470E
R31
12K
R22
560E
R23 1K5
R67
8K2
R69
47E
R77
8K2
R76
12K
R39
68E
R36
820E
R55
68K
R40
12K R56
4K7
R53
390E
R27
470E
R54
2K2
R68
47K
C24
0.0047U
C31
470P
C28
470P
C33
0.0018U
C22
100P
C13
0.001U
C32
0.0018U
C21
100P
TR11
NJE350
TR15
MJE350
TR10
MJE340
TR7
MJE340
TR12
2N5401
TR12
2N5551
D16
1N4002
TR1
MJE802
R45
12K 2W
D15
10 1W
D19
10V 1W
C25
220U/25V
D18
1N4002
D29
1N4002
D30
1N4002
D17
1N4002
VR1 500E
C14
10/50V
TR25
MJE340
TR19
NJE15031 TR9
TIP36C
TR6
MJE15030
TR4
2SC5200
R29 10E
R30
4E7
D28
1N4002
D7
1N4002
D8
6A2
C23
0.1U
TR23
MJE350
TR8
MJE15031
TR24
MJE15030
TR5
2SA1943
TR18
TIP35C
D13
1N4002
D9
6A2
R70
47K
R74
4K7
R73
10K
R21
47K
D14
1N4148
TR21
BC847
TR26
BC847
TR20
BC847
TR27
BC857
TR22
BC857
TR13
BC32725
TR17
BC857
C34
1000U/6V3
C30
220U/50V
R59
330E
R46
10K
R60
33K
R58
10K
R71
10K
R72
10K
R48
470E
R47
10K
R57
150K
C29
1U/50V C26
0.1U
C20
0.0047U
R52
12K2W
C27
220U 25V
R26
0E2 5W
R24
0E2 5W
C17
0.0047U
D12
1N4148
D10
1N4148
R25
10E
R37
4E7
C35
0.0047U
7
6
5+
_IC7B
MC33078
1
2
3
48
+
_
IC7A
MC33078
R94
10K
R93 22K
R98
1K
R92
1K
R90
100K
DL2 100P
C40 100P
D33
4148 D32 4148
+VCC1
-VCC1
+VCC2
-VCC2
Vin
1
GND
2
Vout 3
IC5
7815 C43
10/25V
C42
10/25V
C15
10000/80V
C16
10000/80V
Vin
1
GND
2
Vout 3
IC3 7805
C37
1000U 6.3V
R79
47E/5W C38
2200U/63V
+VCC1
-VCC1
+VCC2
-VCC2
-15V
+5VA
+15V
-15V
+15V
-15V
-15V
R78
100E PTC
+15V
or NJL21184
or SIMILAR
or MJL21193
+15V
C45
10U NP
12
34
56
78
910
1112
1314
CN1
CN-7PX2-F
+15V
RL1
OZ-SS-124LM1
DC 24V 16A
+5VA
-15V
S10
LOW OUT+
S9
GND
LOW SPEAKER
FROM 313127 INPUT PCB
SOFT START
OFFSET PROTECTION
-8.3V
14.8V
11.1V
14.2V
11.6V
10.97V
0.1V
-0.56V
0.58V
27.5V
9.6V
32.1V
-32.4V-27.7V
-7.6V
-0.33V
-1.4V
+1.4V
F4
T8A
F1
T8A
F2
T8A
F3
T8A
D1
KBPC25
D5
KBU806
D3
1N4002
C11
0.01uF400V
C1
400V/10N
BP25-06PWS
TR1
2SC5200
R19
0E2 5W
or NJL21184
TR2
2SA1943
or MJL21193
R20
0E2 5W
C18
10000U/50V
C19
10000U/50V
D4
4002
GND 1
Vin
2Vout 3
IC4
7905
1
2
3
48
+
_
IC5A
MC33078
7
6
5+
_IC5B
MC33078
R71
15K R70 47K
R73
10E
R11
10K
C3
22UF/50V
C4
10UF/50V
C6
10UF/50V
DL1 47P
MUTE
ST-BY
1
2
3
4
5
6
78
9
10
11
12 13
14
15
IC1
TDA7294
R3
22K
R4
1K
R21
10K
R32
33K
R12
22K
R1
22K
R12
10E 0.5W
C5
0.1U
D1
4148
R2
680E
+VCC1
-VCC1
+15V
-15V
C2
1U 50V NP
TDA7294
S1
HIGH OUT +
S2
GND
Hi SPEAKER
TR16
BC857
D8
1N4148
R30
10K
AC INPUT
BREAKER
PT-PS5HA-220V
BLA
RED
RED
YEL
YEL
03-2

03-4

04-1

04-2

04-3

Instruments required:
1) Sinusoidal signal generator, 5) Resistive load 4 Ω 800W,
2) Dual trace scope, with probe, 6) Resistive load 8Ω 300W
3) Digital multimeter, 7) Pink noise from the GM “AUDIO CD”.
4) Variac 0-250 Vac,
P.S: Isolate the oscilloscope from earth and adjust the two traces on center of screen in GND
position.
Par. 1: visual check
-Make a visual check if the amplifier is perfectly done and especially verify:
a) the right value of fuses 8A 250V *4PCS
b) the right earth main connection on rear surface of front panel.
c) the insulation between the heat-sink and the case of TR1-15, IC1, 2, 3, 4 -then,
-Set the VOLUME control full clockwise.
Par. 2: connections
-Switch off the amplifier module,
-Set the ENCODER pot. on preset “NORMAL”.
-Connect the mains of amplifier module to VARIAC and set it at zero AC voltage.
-Connect the signal generator to Line Input (XLR socket) and set it at 1000Hz /-1.5dBu,.
-Connect the scope CH1 probe to amplifier low output and CH2 probe to amplifier high output-
Par. 3: Initial test
-Increase slowly the VARIAC voltage up to the nominal value (230Vac).
-Check the transformer sec. voltages with multimeter, (without signal on input):
F3-F4: 54V ±1.5Vac
F1-F2: 106V ±2Vac
-Check the +/-15Vdc supply on relative voltage regulator outputs (IC3 & IC4 devices).
-Switch ON the signal generator and verify that the output signals must be symmetrical referring
to GND, without detectable distortion and oscillation.
-Check that the low amplifier power output signal is 35VRMS.
--Check of SIGNAL led function, moving the volume potentiometer of amplifier;
when the output signal is <0.5Vpeak the led must be OFF,
when the output signal is > 0.5Vpeak, the led must be GREEN lighted.
-Then, rotate the volume potentiometer knob full clockwise
Par. 4: BOOSTER check of LOW Amplifier
-Connect alternatively the CH2 probe tip of scope on D2 cathode and D3 anode and
verify the following conditions:
when the output signal is < 18Vrms the ±VCC1 voltage must remain linear at 35V,
when the output signal is > 18Vrms the ±VCC1 voltage must follow the output signal wave with
6Vdc offset, as shown in the following picture
05-1

TESTING PROCEDURE
-Switch ON the LOW amplifier output to 4Ω load resistor and repeat the above booster check
verifying more or less the same ± VCC1 conditions and verify that the signal must be
symmetrical refer to GND, without detectable distortion and oscillation.
Increase the VOLUME pot. until a signal clipping.
Switch OFF the LOW amplifier out. to 4Ω load resistor
Par. 5: COMPRESSOR check of LOW amplifier
-Increase the input signal of 10 dB and check the out. signal to remain constant at 45Vpeak and
if the Signal/Comp. led has changed the lighted colour, from GREEN to RED.
Par. 6: PTC function check on Heatsink
-Heat the PTC temperature sensor with a welder heated tip, in touch with its body, to verify this
protection works properly reducing the amplifier out. signal to few volts ontime.
P.S. The check must be done with PTC, placed into heat-sink hole and silicon grease on.
Par. 7: Idle current setting of LOW amplifier
-Decrease to zero the signal generator, then, adjust VR1 trimmer to have a 5mV ±0,5mVdc
voltage drop across R24 & R26 (0,2 Ω) power resistors.
Par. 8: HIGH amplifier check .
-Select a 10KHz frequency with 1dB amplitude on signal generator.
-Connect CH2 probe tip of scope on HIGH amplifier output.
-Check that the high amplifier power output signal is 20+2VPEAK (18VRMS).
-Switch ON the HIGH amplifier output to 8Ω load resistor and increase the VOLUME pot. -
Verify the out. signal is limited to 22Vpeak.
-Switch OFF the HIGH amplifier output to 8Ω load resistor.
Part .9: Burn-in test
1. Connect the pink noisesignal from CD player with the line input of speaker module.
2. Connect 4ohm 500W load resistor with the bass output.
3. Connect 8ohm 300W load resistor with the treble output.
4. Put band switch to the position 1, and then turn on the power switch of speaker module.
5. Adjust the pink noise level from CD player untilSIGNAL/LIMIT indicators (red, green) sparkle.
6. Put the speaker module vertical and take the burn-in test for 2 hours.
Part .10: Final inspection
1. Check the electronic performance of the tested unit completely.
Note: remove the short-circuit connector of313115-1 CN1 after test.
05-2

Audio Precision
05/30/05 16:42:27
SR500A FLAT 3
Frequency Response.at2
Color Line Style Thick Data
Axis
Cursor1
Blue Solid 2
Anlr.Bandpass
Left *+104.920 dBr A_
+60
+110
+70 +80 +90
+100
+104.92
+103.097
d
B S P
L
20 30k50 100 200 500 1k 2k 5k 10k
1.05054k103.664
Hz
05-3

06-1

06-2

06-3

07-1

LEVEL
PART NO ITEM DESCRIPTION SPECIFICATION PCS
1MG00349 black screw-φ8 M3*16 12
2MD00713 ZC-grille-black SR 500A ALTO_V1.2 1
3MG00511 black screw-flat M4*37_V1.0 6
4NI02923 treble horn-ABS 280*206.5*17mm black 1
5MG00350 black screw-φ10 M5*30 12
6NI03153 horn-PP SR400A black_V1.0 1
7ND00231 sponge 10*50*50mm 1
8MG00495 black screw-pill M6*13*1.0PH 3
9NI02924 fixed rack-ABS 84.9*114.3*15mm bkack 1
10 HG00082 treble speaker driver PA-DE34 Zn P-AUDIO 8Ω(diaphram from China) 1
11 MG00464 black screw-inner hex
-pan head -6.0 M10*30*1.5PH 10
12 MG00338 black screw-T shape headφ8 M4*30mm 8
13 NI03152 handle-ABS 85.6*207*7 black_V1.0 2
14 MG00536 balck screw-pill M4*20_V1.0 12
15 NI03151 handle cover-ABS SR400A;SR500SA black_V1.0 2
16 NC00689 K-speaker wooden box SR500A 15吋 PLYWOOD black_V1.0 1
17 MI01870 ZE-fixed rack-color plated SR400A_V1.1 5
18 MG00351 black screw-pill M4*16 14
19 HK05669 K-front panel combination SR500A-ALTO_230V 1
20 ND00367 EV sponge -one side adhesive 2.0t*100*18mm dark black_V1.0 2
21 HK05280 K-speaker_bass 15吋 300W 4Ω SR500A(Z008289_LP385.75) 1
22 ND00408 EV sponge -one side adhesive SR 500A-15 435*18*2.0t black_V1.1 2
23 ND00398 EV sponge -one side adhesive SR500A-SUB 1205.5*15*2 black_V1.0 1
24 ND00397 EV sponge -one side adhesive φ204.5*φ186.5*2 black_V1.0 1
MECHANICAL PART LIST
MODEL NO SR500A_ALTO_230V
07-2

PC00626 SR500A SR500A_ALTO_230V REVISED: 2006/5/30
PART NO
DESCRIPTION SPECIFICATION QTY REFERENCE
├0001---------------------------------
NC00689 box SR500A 15 inch PLYWOOD_V1.0 1
│├0001-------------------------------
NI03152 handle 85.6*207*7 black_V1.0 2
│├0002-------------------------------
NI03151 handle cover SR400A;SR500SA black_V1.0 2
│├0003-------------------------------
MI01870 fixed bracket SR400A_V1.1 5
││└0001-----------------------------
MI01871 fixed bracket SR400A 3.0t*70*70_V1.1 1
││ ├0001----------------------------
MJ01240 single light board 3.0t*1950*1185mm 54kg 1
││ └0002----------------------------
ME00125 iron pillar M10*9*1PH_V1.1 2
│├0004-------------------------------
MG00464 screw M10*30*1.5PH 10
│├0005-------------------------------
MG00031 screw M4*12 40
│└0006-------------------------------
NC00690 box SR500A 15 inch PLYWOOD_V1.0 1
│ ├0001------------------------------
ME00082 nut M5 12
│ ├0002------------------------------
ME00083 nut M6 4
│ ├0003------------------------------
ME00085 nut M4 8
│ ├0004------------------------------
MG00353 screw M6*30 4
│ ├0005------------------------------
MH01704 handle ELVIS φ110*96_V1.0 1
│ │└0001----------------------------
MH00801 bracket φ110*96_V1.1 1
│ ├0006------------------------------
NI02426 foot cushion φ37*15.5mm 4
│ ├0007------------------------------
MG00360 screw M4*25mm 4
│ ├0008------------------------------
MG00338 screw M4*30mm 8
│ ├0009------------------------------
MG00361 screw M4*20mm 12
│ ├0010------------------------------
ND00375 EV foam 2.0t*590*18mm black_V1.0 2
│ └0011------------------------------
ND00390 EV foam 293*15*2.0t black_V1.0 1
├0002---------------------------------
MG00349 screw M3*16 12
├0003---------------------------------
MG00511 screw M4*37_V1.0 6
├0004---------------------------------
NI02923 high pitch horn 280*206.5*17mm black 1
├0005---------------------------------
MG00350 screw M5*30 12
├0006---------------------------------
NI03153 horn SR400A black_V1.0 1
├0007---------------------------------
ND00231 sponge 15*50*50mm 1
├0008---------------------------------
MG00495 screw M6*13*1.0PH 3
├0009---------------------------------
NI02924 fixed bracket 84.9*114.3*15mm black 1
├0010---------------------------------
HG00082 speaker PA-DE34 Zn P-AUDIO 8Ω 1
├0011---------------------------------
MG00351 screw M4*16 14
├0012---------------------------------
ND00367 EV foam 2.0t*100*18mm black_V1.0 2
├0013---------------------------------
ND00408 EV foam SR 500A-15 435*18*2.0t black_V1.1 2
├0014---------------------------------
ND00398 EV foam SR500A-SUB 1205.5*15*2_V1.0 1
├0015---------------------------------
ND00397 EV foam φ204.5*φ186.5*2 black_V1.0 1
├0016---------------------------------
HK05280 speaker 15inch 300W 4Ω SR500A(Z008289_LP385.75) 1
│├0001-------------------------------
HG00178 voice coil-RS A09070A_BK 75-45-AL18/18-3_V1.0 1
│├0002-------------------------------
NH00345 cone B08250A_U-SONIC CP312/32-SC348A/6-F_V1.0 1
│├0003-------------------------------
NH00237 cushion C0910A_GR 385/6+2 1
│├0004-------------------------------
ND00485 spider D09140A_CT 75-165/12 C3 CONEX_V1.0 1
│├0005-------------------------------
ND00525 dust-proof shade E06600A_CP 115/C 1
│├0006-------------------------------
MH01983 T type middle pillar H08400A_PN 75/1800.10 F30_V1.2 1
│├0007-------------------------------
MH01985 washer I08410A_PS 75/1800.10 W F4_V1.1 1
│├0008-------------------------------
MH01986 magnet-RS G04550A_D180*95*20 Y30_V1.0 1
│├0009-------------------------------
MI02745 holder L08120B_CR 385/F4 N_V1.0 1
│├0010-------------------------------
HC00426 terminal M0021B_PT2.1 1
││├0001-----------------------------
HC00496 connect terminal 0.8*13*16.3mm 1
││├0002-----------------------------
HC00495 connect terminal 0.8*13*16.3mm 1
││└0003-----------------------------
NI02583 terminal block 3.5*24.5*3t 1
│├0011-------------------------------
MH01110 rivet M0500A_OU-30 2
│├0012-------------------------------
MD00642 iron net SR500SA 0.5t*φ42.5*4H_V1.0 1
││└0001-----------------------------
MD00712 iron net SR500SA 0.5t*φ42.5*4H_V1.0 1
││ └0001----------------------------
MD00643 iron net 0.5t*70*70 SR500SA_V1.0 1
│├0013-------------------------------
HA02494 strand TA4X4YKA42W*120mm 2
││└0001-----------------------------
HA02079 strand TA4X4YKA42W*1M 120
│├0014-------------------------------
MG00599 screw M5*9.6*0.8PH_V1.0 6
│└0015-------------------------------
NE16119 lable HK05280_V1.0 1
│ ├0001------------------------------
NI00014 membrane 0.035*1M 1
│ └0002------------------------------
NH00012 bond paper 0.04*1M 1
├0017---------------------------------
HK05669 faceplater SR500A-ALTO-230V 1
│├0001-------------------------------
MI02033 heat sink 307.5*162*40mm SR500SA_V1.0 1
│├0002-------------------------------
TD00419 transformer PT-SR500SA_230V 1
│├0003-------------------------------
HI00022 power switch-RS 4p black frame red key 1
│├0004-------------------------------
HC00005 AC socket-RS AC-008 1
│├0005-------------------------------
NI01862 key 5.5*5.5*14.5_V1.1 1
│├0006-------------------------------
NI01863 key-RS φ5.5*W10*7.5 1
LEVEL
08-1