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