Inter-m A-60 User manual

www.inter-m.com
MADE IN KOREA
NO: 9007985000
SERVICE
MANUAL
PUBLIC ADDRESS
AMPLIFIER
A-60/120

1
AMP SECTION
1. OFF SET VOLTAGE
A. Setting
Set the master volume control minimum.
B. Connection
C. Adjustment
Control OFFSET until voltmeter is the “0” position. (at Output Terminal)
2. IDLE CURRENT
A. Setting
Set the master volume control minimum.
B. Connection
C. Adjustment
A-60: Adjust VR11 so that the current through the R56 and R58 become 10 milliampere. When that
voltage is 10 millivolt, the current becomes 10 milliampere.
A-120: Adjust VR11 so that the current through the R56 and R58 become 5 milliampere. When that
voltage is 5 millivolt, the current becomes 10 milliampere.
ELECTRICAL ADJUSTMENT PROCEDURE
IDLE VR10
OFFSET
MAIN PCB (4005181100)
VOLT METER
CHASSIS
R56
R57
R58
R59
IDLE VR11
MAIN B’D (4005181100)
VOLT METER
Electrical Adjustment Procedure 1
Specifications 2
Electrical Parts List 3, 4
Top and Bottom View of P.C. Board 5
Wiring Diagram 6
Block Diagram 7
Schematic Diagram 8, 9
Exploded View of Cabinet & Chassis / Mechanical Parts List 10, 11
Ass’y Drawing 12, 13
CONTENTS

3
ELECTRICAL PARTS LIST
Ref No. Part No. ValueDescription
Q16-17 2008206998-T TR PNP 2SA 965Y(KTA 1023Y) 2SA 965Y
Q18-19 2008407970-T TR NPN KTC 2SC 2235Y(KTC1027Y) 2SC 2235Y
Q21 Q106 2008606104-T TR NPN KTC 3198Y KTC 3198Y
Q22 2008606105-T TR PNP KTA 1266Y KTA 1266Y
Q12-15 Q20 2008606108-T TR NPN KTC2240BL (KTC 3200BL) KTC 2240BL
Q100 2008606998-T TR NPN KTD 1302 KEC ONLY KTD1302
Q101-103 2008606998-T TR NPN KTD 1302 KEC ONLY KTD 1302
Q8(A60) 2028107106 TR PNP 2SB688(O)/2SA1940 2SB 688
Q8-9(A120) 2028107118 TR PNP 2SA1943 TOSHIBA 2SA1943
Q11 2028107984 TR PNP 2SA 1306A(Y),KTA1659A(Y KTA 1659A
Q6(A60) 2028407109 TR NPN 2SC5197 TOSHIBA 2SD 718
Q6-7(A120) 2028407122 TR NPN 2SC5200 TOSHIBA 2SC5200
Q10 2028407990 TR NPN 2SC 3298A(Y),KTC4370A(Y KTC 4370A
D16-17 2058010101 DIODE IN 60 1N 60
D100 2058100103 DIODE KBPC-2504(SB256)LUG TYPE KBPC2504
D14 2058100996 DIODE RECTIFIER LT1N4006(4007) 1N 4006
D15 D101-104 2058100996 DIODE RECTIFIER LT1N4006(4007) 1N4006
D10-13 2058304100 DIODE IN4148M 1N 4148
D105-106
ZD109 2058502120 DIODE ZENER UZ-12BM(1N5242B) UZ-12BM
IC111-112 2118030405 IC KEC KIA 6966S KIA6966S
IC8 2118050410 IC TA7317P TOSHIBA TA 7317P
IC101 2128611000 IC KA7818 COMMON 7818
IC102 2128611100 IC KA7918 COMMON 7918
TH1-2 2438209011 THERMISTOR YSG-503J L=100MM 50K
R77 3009101973 RES CF 100 1/5W J N 100
R71-72 R81 3009102973 RES CF 1K 1/5W J N 1K
R69 R74-76 3009103973 RES CF 10K 1/5W J N 10K
R93 R187 3009104973 RES CF 100K 1/5W J N 100K
R68 R86-87 3009152973 RES CF 1.5K 1/5W J N 1.5K
R88 R96 3009153973 RES CF 15K 1/5W J N 15K
R98 R92
R65 R83 3009182973 RES CF 1.8K 1/5W J N 1.8K
R66 3009203973 RES CF 20K 1/5W J N 20K
R78-79 3009221973 RES CF 220 1/5W J N 220
R97 3009224973 RES CF 220K 1/5W J N 220K
R90 3009302973 RES CF 3K 1/5W J N 3K
R99 3009333973 RES CF 33K 1/5W J N 33K
R73 3009471973 RES CF 470 1/5W J N 470
R70 R95 3009473973 RES CF 47K 1/5W J N 47K
R80 3009562973 RES CF 5.6K 1/5W J N 5.6K
R89 R91 R94 3009563973 RES CF 56K 1/5W J N 56K
R100
R67 3009821973 RES CF 820 1/5W J N 820
R62 3039103575-T RES MO 10K 2W JR 10K 2W
R63 3039152575-T RES MO 1.5K 2W J RADIAL 1.5K 2W
R60-61 3039203473-F RES MO 20K 1W JN 20K 1W
R64 3039271575-T RES MO 270 2W J RADIAL 270 2W
R101-102 3059100772 RES CE 10 5W JN 10/5W
R54(A60) 3009392973 RES CF 3.9K 1/5W J N 3.9K
R54(A120) 3009152973 RES CF 1.5K 1/5W J N 1.5K
R9(A60) 3009822973 RES CF 8.2K 1/5W J N 8.2K
R9(A120) 3009562973 RES CF 5.6K 1/5W J N 5.6K
R82(A60) 3009103973 RES CF 10K 1/5W J N 10K
R82(A120) 3009133973 RES CF 13K 1/5W J N 13K
R84-85(A60) 3009123973 RES CF 12K 1/5W J N 12K
R84-85(A120) 3009203973 RES CF 20K 1/5W J N 20K
R56-59(A60) 3049478783 RES CE 0.47 5W J T HAN NAE 0.47/5W
R56-59(A120) 3059278783 RES CE 0.27 5W J T 0.27/5W
VR9 3228082210 VR RK09K111083MA 10KB
VR10-11 3248347120-T SES SEMI RH0638C100471 470B
C103-104 3408222261 CAP RSA 2200UF 35V SNAP 18 P 2200/35
C75-76 C79 3409210071-T CAP AF RSG 10UF 50V 5 P 10/50
C105-106 3409210141-T CAP AF RSG 100UF 25V 6 P 100/25
C71 C119 3409210971-T CAP AF RSG 1UF 50V 5 P 1/50
C128 C139
C142 C144
C147 C151
C154-155
C80 3409222071-T CAP AF RSG 22UF 50V 5 P 22/50
C77 3409233071-T CAP AF RSG 33UF 50V 6 P 33/50
MAIN B’D (4005181100)
Ref No. Part No. ValueDescription
C72-74 C81 3409247071-T CAP AF RSG 47UF 50V 6 P 47/50
C117-118
C137-138
C149-150
C152 C159
C78 3409247871-T CAP AF RSG 0.47UF 50V 5 P 0.47/50
C112-113 3409247971-T CAP AF RSG 4.7UF 50V 5 P 4.7/50
C123-124
C132-133
C202-205
C67 C69-70 3509101130-T CAP CE SL 100PF 50V J 100P
C111 3509102530-T CAP CE B 0.001UF 50V J 0.001/50
C1 C68 3509103530-T CAP CE F 0.01UF 50V Z 0.01/50
C107-108 3509104530-T CAP CE F 0.1UF 50V Z 0.1/50
C66 3509470130-T CAP CE SL 47PF 50V J 47P
C157 3609103120-T CAP MA 0.01UF 100V 0.01/100(M)
C300-301 3609104120-T CAP MA 0.1UF 100V J 0.1/100(M)
C303-304
C156 C158
C65 3609182120-T CAP MA 0.0018UF 100V J 0.0018/100(M)
C101-102(A60) 3419533279 CAP LSW332M 1HO25M(3300UF/50V) 3300/6.3
C101-102(A120) 3419510379 CAP E LPW103HIJP63V-WGB3 JAMIC 10000/50
FB101-106 3908609990 EMI FILTER 1000PF EMI 1000P
IDLE1-3 4355469103 WIRE JUMPER JUMPER
WAF9 4428595003 LW5267/LWB0640/2.5MM-03P LW-5267-03P
WAF5 4428595004 LW5267/LWB0640/2.5MM-04P LW-5267-04P
WAF7-8 4428595005 LW5267/LWB0640/2.5MM-05P LW-5267-05P
WAF4 4428595005 LW5267/LWB0640/2.5MM-05P LW-5267-05P
WAF3 4428596602 WAFER LW-1143-02P LW-1143-02P
WAF1-2 4428596603 LOCK WAFER LW-1143-03P LW-1143-03P
AUX1-2 4438095210 JACK RCA 4P RCA 4P
MIC1-3 4438097310 JACK PHONE 4P PHONE 4P
F101-102 5508411934 FUSE TS 20MM 630MA/250V U/C/S T630mA/250V
RLY1 5528008200 RELAY DH24D1-0 24V (DAIICHI) HR-311
IC103-105 S21101080002 IC 2068 SOIC8 NJM 2068DD
R109-110 S30101017121 RES TF 100 1/16W 1608 100
R123-124
R135-136
R184
R113-114 S30101027121 RES TF 1K 1/16W 1608 1K
R119-120
R105-106 S30101027121 RES TF 1K 1/16W 1608 1K
R103-104 S30101037121 RES TF 10K 1/16W 1608 10K
R111-112
R117-118
R127
R132 R146
R185-186 S30101047121 RES TF 100K 1/16W 1608 100K
R128 S30101137121 RES TF 11K 1/16W 1608 11K
R139 S30101237121 RES TF 12K 1/16W 1608 12K
R107 R108 S30101247121 RES TF 120K 1/16W 1608 120K
R115 R121 S30101847121 RES TF 180K 1/16W 1608 180K
R116 R122
R188 S30102037121 RES TF 20K 1/16W 1608 20K
R125-126 S30102217121 RES TF 220 1/16W 1608 220
R130-131
R137 S30102237121 RES TF 22K 1/16W 1608 22K
R138 S30102247121 RES TF 220K 1/16W 1608 220K
R141 S30102257121 RES TF 2.2M 1/16W 1608 2.2M
R190 R193 S30103317121 RES TF 330 1/16W 1608 330
R143 S30103337121 RES TF 33K 1/16W 1608 33K
R142 S30103937121 RES TF 39K 1/16W 1608 39K
R129 R134 S30104727121 RES TF 4.7K 1/16W 1608 4.7K
R191 R133 S30104737121 RES TF 47K 1/16W 1608 47K
R140 R145
R144 R192 S30105637121 RES TF 56K 1/16W 1608 56K
R147 S30105647121 RES TF 560K 1/16W 1608 560K
R189 S30108237121 RES TF 82K 1/16W 1608 82K
C110 C121-122
S35101025321 CAP CL 0.001UF 50V K 1608 0.001/50
C130 C141
C146 C131
C143 C148 S35100504321 CAP CL 5PF 50V J 1608 5P
C114 C125 S35101504321 CAP CL 15PF 50V J 1608 15P
C134
C126 C127 S35103304321 CAP CL 33PF 50V J 1608 33P
C135-136
2
SPECIFICATIONS
ELECTRICAL
• Rated Output/Impedance..........................................................A-60: 15.5V/4Ω, 70V/81.6Ω, 100V/166.7Ω
....................................................................................................A-120: 21.9V/4Ω, 70V/40.8Ω, 100V/83.3Ω
• Input Sensitivity/Impedance
MIC 1-3............................................................................................................................ -60dB/600Ω, BAL
Aux 1 .......................................................................................................................... -10dB/10kΩ, UNBAL
Aux 2 ...........................................................................................................................+3dB/10kΩ, UNBAL
• Frequency Response (±3dB)...................................................................................................80Hz~16kHz
• T.H.D.......................................................................................................................................Less than 1%
• S/N
MIC....................................................................................................................................Better than 50dB
Aux.....................................................................................................................................Better than 75dB
• Tone Control
HIGH (10kHz).....................................................................................................................................±12dB
LOW (100Hz) .....................................................................................................................................±12dB
GENERAL
• Power Source .......................................................................................................AC 100V–240V, 50/60Hz
• Power Consumption....................................................................................................................A-60: 75W
...................................................................................................................................................A-120: 105W
• Weight........................................................................................................................................A-60: 8.9kg
.................................................................................................................................................A-120: 10.3kg
• Dimensions......................................................................................................420(W) 88(H) 320(D)mm
*Specifications and design subject to change without notice for improvements.

5
TOP AND BOTTOM VIEW OF P.C. BOARD
4
Ref No. Part No. ValueDescription
C153 S35104704321 CAP CL 47PF 50V J 1608 47P
C115 C116 S35106804321 CAP CL 68PF 50V J 1608 68P
VR6-7 3228069180 RK09S11F010353B 50KB
VR1-5 VR8 3228069190 RK09S11B000313A 10KA
C164 C167 3409210071-T CAP AF RSG 10UF 50V 5 P 10/50
C165 C168 3409210071-T CAP AF RSG 10UF 50V 5 P 10/50
C160 3409222071-T CAP AF RSG 22UF 50V 5 P 22/50
C172 C178 3409233071-T CAP AF RSG 33UF 50V 6 P 33/50
C162-163 3409247071-T CAP AF RSG 47UF 50V 6 P 47/50
C170-171
C173 3609102120-T CAP MA 0.001UF 100V 0.001/100(M)
C175-176 3609103120-T CAP MA 0.01UF 100V 0.01/100(M)
C174 3609152120-T CAP MA 0.0015UF 100V J 0.0015/100(M)
CON9 4355740621 CON ASS Y 3P 510MM A-60/120 CON ASS Y 3P
(510MM)
CON7 4355743319 CON ASS Y 5P (450MM) A-60/120 CON ASS Y 5P
(450MM)
CON8 4355764012 CON ASS Y 5P (250MM) A-60/120 CON ASS Y 5P
(250MM)
IC106-107 S21101080002 IC 2068 SOIC8 NJM 2068DD
R151-152 S30101017121 RES TF 100 1/16W 1608 100
R158-159
R156 S30101027121 RES TF 1K 1/16W 1608 1K
R157 S30101037121 RES TF 10K 1/16W 1608 10K
R165 S30101227121 RES TF 1.2K 1/16W 1608 1.2K
R200-205 S30101237121 RES TF 12K 1/16W 1608 12K
R208-209 S30101337121 RES TF 13K 1/16W 1608 13K
R210 S30101837121 RES TF 18K 1/16W 1608 18K
R148 R153 S30102727121 RES TF 2.7K 1/16W 1608 2.7K
R206-207 S30103927121 RES TF 3.9K 1/16W 1608 3.9K
R150 R155 S30104717121 RES TF 470 1/16W 1608 470
R149 R154 S30104737121 RES TF 47K 1/16W 1608 47K
C161 C166 S35100504321 CAP CL 5PF 50V J 1608 5P
C177 S35101004321 CAP CL 10PF 50V J 1608 10P
C169 S35101514321 CAP CL 150PF 50V J 1608 150P
LD1 LD7-8 2308684231 LED REC KLR208 2*5 RED KEC RED
LD2-6 2308684271 LED REC KLG208 2*5 GRE KEC GREEN
CON5 4355740421 CON ASS Y 4P 510MM A-60/120 CON ASS Y 4P
(510MM)
CON4 4355740521 CON ASS Y 5P 510MM A-60/120 CON ASS Y 5P
(510MM)
R1-8 S30106817121 RES TF 680 1/16W 1608 680
TER1 4408193904 TERMINAL BLOCK(M) 4P TERMINAL
BLOCK(M)4P
TER2 4408194004 TERMINAL BLOCK(F) 4P TERMINAL
BLOCK(F)4P
WAF6 4428596604 LOCK WAFER LW-1143-04P LW-1143-04P
C100 3549472407 CAP DE2E3KH472MA4B 0.0047/400V
WAF11 4428596603 LOCK WAFER LW-1143-03P LW-1143-03P
SW1 4648199920 SW POWER SDD1PASL011 A-60/120 POWER S/W
OPT1(A60) 2818086100 TRANS OUTPUT A-60 O.P.T
OPT1(A120) 2818086200 TRANS OUTPUT A-120 O.P.T
OPT1(A60UL) 2818085900 TRANS OUTPUT A-60(UL) O.P.T
OPT1(A120UL) 2818086000 TRANS OUTPUT A-120(UL) O.P.T
PT1(A60) 2828060000 TRANS POWER 120V A-60 120V
2828060010 TRANS POWER 220V A-60 220V
2828060020 TRANS POWER 230V A-60 230V
2828060030 TRANS POWER 240V A-60 240V
PT1(A120) 2828059900 TRANS POWER 120V A-120 120V
2828059910 TRANS POWER 220V A-120 220V
2828059920 TRANS POWER 230V A-120 230V
2828059930 TRANS POWER 240V A-120 240V
F100(A60) 5508112937 FUSE 51S 20MM 3A/250V K/U/C/J 120V
5508212730 FUSE NB 20MM 2A/250V KS 220V
5508412736 FUSE TS 20MM 2A/250V U/C/S/V 230V/240V
F100(A120) 5508103337 FUSE 53S 20MM 5A/250V K/U/C/J 120V
5508112837 FUSE51S 20MM 2.5A/250V K/U/C/J 220V
5508412836 FUSE TS 20MM 2.5A/250V U/C/S/V 230V/240V
OUTPUT LED B’D (4005181120)
SP TERMINAL B’D (4005181130)
POWER SW B’D (4005181140)
VOLUME B’D (4005181110)

76
BLOCK DIAGRAMWIRING DIAGRAM

98
SCHEMATIC DIAGRAM

1110
EXPLODED VIEW OF CABINET & CHASSIS/MECHANICAL PARTS LIST
A-120(OPT)
A-120(PT)
S2
7502088710
056335999520
8543998110
048573994111
8109230083
8095996930
2828060010
A-60/120 EXPLODED VIEW DWG PARTS, LIST
048521990611
PARTS NO
8109330063
8109230103
8109340083
8099130161
SCREW #2BTC 3X8B
ASS’Y SCREW PM 4X18B
SCREW #2BTC 3X10B
SCREW #3BTC 4X8BK
HEX MSPW 3X16Y
S8
S3
S4
S6
S7
S5
TRANS POWER
BACK CHASSIS
SP TERMINAL B’D
JACK NUT
SCREW #3BTC 3X6B
DIODE
20
24
23
22
S2
21
S1
18
15
19
17
16
PARTS NAME
FRONT PANEL
POWER SW B’D
KNOB PUSH
HEAT SINK
FOOT
OUTPUT LED B’D
VOLUME B’D
BRACKET PCB
HEAT SINK BKT
MAIN B’D
INLAY
6
7
9
8
13
14
12
10
11
N0
1
5
3
4
2
1
1
14
1
1
1
1
1
3
1
1
1
1
1
4
1
1
1
REMARK
1
1
Q’TY
1
2
3
45
67
8
9
10
11
12
14
13
15
16 17
14
18 19
20
21 22 23
24
S1
S3
S5
S4
S6
S7
S7
S8
S8
S1
S2
S1
S3
S1
S2
1
048521990612 1A-60
A-120
KNOB CONTROL 048543998313 6
KNOB CONTROL 048543997011 2
4005181110
4005181120
4005181140
CHASSIS MAIN 6121674910
6505942010
4005181100
6505968010
2058100103
2828059910 1
TRANS OUTPUT 2818086200
2818086100
1
046102979011
046102979015
4005181130
TERMINAL BLOCK(F) 4408194004
STOPPER CORD 6518999810 1
CORD AC DOM 3 CORE 4308999710 1
046122089610
TOP COVER 1
SCREW BM 3X6B 8009130063
ASS’Y SCREW 3PTC 4X8B 8095993410
12
10
4
3
8
9
1
A-60
A-120
A-60
A-120
A-60
A-120
8525998410

1312
ASS’Y DRAWING
420
88 320
MAX
TOP COVER 046122089610 1
1
BACK CHASSIS
046102979011
046102979012
046102979013
046102979014
1
2
CONTROL KNOB 048543998313 6
CONTROL KNOB 048543997011 2
4
3
1
AC CORD 4308991710 1
5
9
6
SW POWER 048543997210 1
FRONT PANEL
048521990611 1A-60
048521990612 1A-120
A-60
RCA JACK 4P 4438095210
12
1
220V
230V
120V
240V
1
1
RemarkNo. Description Part No Q'ty
046102979015
046102979016
046102979017
046102979018
1
1
A-120
A-60
A-120
A-60
A-120
A-60
A-120
220V
230V
120V
240V
1
1
INLAY 048573994111 1
CONTROL KNOB 048543997011 1
7
PHONE JACK 4438097310 3
8
11
SPEAKER TERMINAL 4408193904 1
10
PUBLIC ADDRESS AMPLIFIER
A-120
PROT -14
MIN MAX
MASTER
MIN MAX
MIC 2 POWER
MIN MAX
MIC 1
MIN MAX
MIC 3
-12dB +12dB
TREBLE
MIN MAX
AUX 1
MIN MAX
AUX 2
-12dB +12dB
BASS
~AC INPUT
230V 50Hz, 105W
MIC 1
010
MIC1 MUTE
MIC 2MIC 3
AUX 2 AUX 1
L R
-10
-7
-3
0
+3
ON OFF
S/N
MADE IN KOREA
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
CAUTION;TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT REMOVE COVER.
NO USER SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.
AVIS; RISQUE DE CHOC ELECTRIOUE NE PAS OUVRIR.
PUBLIC ADDRESS AMPLIFIER
MODEL: A-120
COM 100V(83 )
WARNING;TO REDUCE THE RISK OF ELECTRIC SHOCK.
DO NOT EXPOSE TUIS EQUIPMENT OR MOISTURE.
70V(41 )
4www.inter-m.com
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NOTE