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RS-8/RS-8a
Reference Series
Speaker System
SERVICE MANUAL
Infinity Systems, Inc
250 Crossways Park Dr.
Woodbury, New York 11797
REV 2 6/2001
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RS-8/RS-8a
2
TABLE OF CONTENTS
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
DETAILED SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
SET-UP GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
TROUBLE SHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
SERVICE BULLETIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
SYSTEM COMPONENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
AURAL SWEEP TEST SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
PASSIVE SCHEMATIC DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
EXPLODED VIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
AMPLIFIER EXPLODED VIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
PCB DRAWING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
POWER TRANSFORMER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
RS8 ELECTRICAL PARTS LIST (120V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
RS8a ELECTRICAL PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
INTEGRATED CIRCUIT DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
RS-8 EARLY REV0 SCHEMATICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
RS-8 REV1 SCHEMATIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
RS-8a SCHEMATICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
IMPORTANT NOTE:
THIS MANUAL IS FOR BOTH MODELS RS-8 and RS-8a.
MODEL RS
-8 DOES NOT HAVE AN “M” IN THE SERIAL NUMBER.
MODEL RS-8a HAS AN “M” IN THE SERIAL NUMBER.
serial number is located in the speaker input cup.
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Specifications
RS-8/RS-8a
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RS-8/RS-8a
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RS8 Amplifier, 100W Powered Sub/Plate Amp
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RS-8/RS-8a
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RS-8/RS-8a
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Trouble Shooting
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Service Bulletin
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Component Exploded View
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RS-8a Amplifier Exploded View
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Block Diagram
RS-8/RS-8a
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Attenuation
SPKR Level in
Low Level in
Low Level in
Normal
H.P. Filter
Direct
Vol. Ctrl
Auto on/off
Auto
On
L.P. Filter
L.P. Filter
Limiter
&
O/P Limited
Soft Clip
-15V
+15V
P.L.
Mute
Power Stage
O/P CTRL
Temperature
Protect
Protect
Protect
Over Load
DC Offset
HV
Rectifier
AC120V/60Hz
Speaker
Power SW.
P.T.
Fuse & Holder
+/-15V
Power Supply
+15V
-15V
RS8 Pre Amp.
RS8 Power Amp.
+
00022
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RS-8/RS-8a
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RS-8a Circuit Boards
Control PCB Main PCB
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RS-8/RS-8a
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RS-8a Circuit Boards (Cont.)
Control PCB Main PCB
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RS-8a Circuit Boards (Cont.)
Control PCB Main PCB
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RS-8 Circuit Board
RS-8/RS-8a
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C15
C23
+
JW4
JW3
JW2
C5
C11
C7
OFF
AUTO
C
ON
SW1
POT
R41
C28
+
Q1
C2
+
4
3
SENSE
-V
8
5
TH1
-VO
Q6
JW9
JW10
JW11
TF1
TF1
LINE 1
Q5
SPEAKER
OUT(-)
L1
CT
BR1
-
AC
AC
+
LINE 2
A
AGND
1
+VO
C31
+
+
-
+
C32
C1
JW5
SW2
C27
+
+
+
JW14
C29
C18
+
Q4
R36
5
+
+
7
JW8
GATE
C17
C4
2
+V
JW13
JW1
MAIN PCB
CL1268
REV-02
+
C9
LED CONN
4
RSP
8
3
B
A
3
7
TRIAC1
JW12
F1
1
2
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RS-8/RS-8a
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TERMINAL FASTON (3X)
AMP 2-520263-2 (3X)
0.187" X 0.020"
OR EQUIVALENT
(MATES WITH FASTON
TERMINAL 0.250" X 0.032")
WIRE LENGTH
(INCLUDES TERMINAL)
RED COLOR (2X)
RED COLOR WITH
YELLOW STRIPE AROUND
3.570
R0.188
(2X)
3.080
1.330
2.650
2.600
11.00
00016
INPUT
OUTPUT
115 V @ 60 HZ
NO LOAD
NOMINAL
33.3 V CT (SEC 1)
33.3 V CT (SEC 2)
WITH LOAD 30.12 V CT @ 2.0 Amps. (SEC 1)
30.12 V CT @ 2.0 Amps. (SEC 2)
PRI 5.06 Ohms MAX
SEC1 1.0 Ohms MAX
SEC2 1.0 Ohms MAX
115V
CENTER TAP TO
BE RED WIRE WITH
YELLOW STRIPE
3
5
RED
RED
34V @ 2A
34V @ 2A
00017
Power Transformer
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RS-8/RS-8a
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RS-8 Electronic Parts List (120v)
Model RS-8 does not have an “m” in the serial number.
Model RS-8a has an “m” in the serial number.
Reference Designator Part Number Description Quantity
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RS-8/RS-8a
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Reference Designator Part Number Description Quantity
Electronic Parts List (Cont.)
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Reference Designator Part Number Description Quantity
Electronic Parts List (Cont.)
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Reference Designator Part Number Description Quantity
RS-8 Electronic Parts List (120v) Continued.
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RS-8/RS-8a
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RS-8a Electrical Parts List
Model RS-8 does not have an “m” in the serial number.
Model RS-8a has an “m” in the serial number.
Part Number Qty Designator Description
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Electrical Parts List (Cont.)
Part Number Qty Designator Description
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Electrical Parts List (Cont.)
Part Number Qty Designator Description
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RS-8/RS-8a
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4558 DUAL OP AMP,
DUAL IN-LINE PACKAGE
(TOP VIEW)
IC101,102,201,202,203
LM311 COMPARATOR,
IC102
GND
+
-
INPUT
V-
V+
OUTPUT
INPUT OFFSET/
STROBE
INPUT OFFSET
+
-
JFET - TL072,
IC1041
1. D
2. S
3. G
TRANS, PNP, 2N5401 TO-92
MPSW56
Q109,115, TR1166
TRANS, P N P ,
2SA1015GR, 2SB649A,
KSD882Y
Q102,104,129,135,110,
134,TR1254
TRANS, NPN, 2N5551 TO-92,
MPSW06,MPS2222A
Q108,104,TR1167, TR1253, TR1063
TRANS, N P N ,
2SD669A,KSD882Y,2SC2412K,
DTC114TK,
Q111,131,TR1108,TR1131
C
B
E
TIP35C NPN,
TIP36C PNP,
TR1057,1061,
Q113,112
E
B
C
TIP31C, TIP32C,
TR1183, 1184
00528
Integrated Circuit Diagrams
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RS-8 Rev 0 Schematic
RS-8/RS-8a
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RS-8 Rev1 SchematicRS-8/RS-8a
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RS-8a SchematicsRS-8/RS-8a
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RS-8a Schematic(Cont.)
RS-8/RS-8a
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Page 31
RS-8a Schematics (Cont.)
RS-8/RS-8a
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