JBL Scs1806 Manual

							
  Surround Cinema Series 
 
Models:   SCS150SI SCS160SI 
SCS180.6S 
Home Theater Speaker Systems 
 
SERVICE MANUAL 
 
 
 
     
JBL Consumer Products 
      250 Crossways Park Dr. 
        Woodbury, New York   11797      Rev
4    10/2005   
						

							
 
-  CONTENTS  - 
 
BASIC SPECIFICATIONS……………….……….……………….1 
DETAILED SPECIFICATIONS  ……..………………..…………..2 
CONNECTIONS…………… …..……………...…………..……...3 
OPERATION………………………………………………………. 6 
BASIC TROUBLESHOOTING……..……….…………………….7 
EXPLODED VIEW ……..……….………………………………….8 
TEST SET-UP AND PROCEDURE……..……….………..……..9 
PCB DRAW INGS…………… ……..………………..…….……..10 
MECHANICAL/SATELLITE PARTS LIST………………………16 
ELECTRICAL PARTS LIST ……………....……………….…….17 
IC/TRANSISTOR PINOUTS……..…….…………………..…….22 
SCHEMATICS …………………………………………..…….23 
PACKING..………….………………………………..…………….26 
 
 
SCS150SI/SCS160SI/SCS180.6S Systems 
Frequency Response    30Hz – 20kHz (–6dB) 
 
 
 
Satellites 
 
Recommended Power 
10 – 100 watts 
Impedance 
8 ohms nominal 
Sensitivity 
88dB @ 1 wa tt/1 meter 
Tweeter 
One 1/2 (13mm) titanium laminate 
dome, video-shielded 
Midrange 
Dual 3  (75mm) driv ers, video-
shielded 
Dimensions (H x W x D) 
8-1/8 x 3-1/2 x 3-7/8 
(206mm x 89mm x 99mm) 
 Weight   
2.65lb/1.2kg 
Center 
 
Recommended Power 
10 – 100 watts 
Impedance 
8 ohms nominal 
Sensitivity 
88dB @ 1 wa tt/1 meter 
Tweeter 
One 1/2 (13mm) titanium laminate 
dome, video-shielded 
Midrange 
Dual 3  (75mm) driv ers, video-
shielded 
Dimensions (H x W x D) 
3-1/2 x 8-1/8 x 3-7/8  
(89mm x 206mm x 99mm) 
Weight  
2.65lb/1.2kg   Subwoofer  
 
Amplifier 
150 watts RMS 
Woofer 
10 (254mm) woofer, bass-reflex 
enclosure 
Dimensions (H x W x D) 
17-3/4 x 15-3/4 x 16-3/4 
(451mm x 400mm x 426mm) 
Weight 
35 lb/15.9kg 
 
 
 
 
 
 
 
   
 
 
 
Occasional refinements may be made to existing products without notice but will always meet or exceed original 
specifications unless otherwise stated
 
SCS150SI/SCS160SI/SCS180.6S             
1  
						

							
 150W Powered Sub/ Plate Amp 
LINE VOLTAGE Yes/No Hi/Lo Line Unit Notes
US 120vac/60Hz Yes 108-132 Vrms Normal Operation
 Asia 100vac/50Hz Yes 90-110 Vrms Normal Operation
Paramete
rSpecification Unit QA Test LimitsConditions Notes
Amp Section
Type (Class AB, D, other) D D  n/a
Load Impedance (speaker) 4 Ohms n/a Nominal
Rated Output Power 150 Watts 145 1 input driven
THD@ Rated Power 0.08 % 1 22k filter
THD @ 1 Watt 0.1 % 0.5 22k filter
DC Offset 10 mV-DC 20 @ Speaker Outputs
Damping factor >100 DF 30 Measured at speaker terminals, Output 
power 140 Watts THD 0.1 %
Input Sensitivity Input Frequency 50 Hz 50 Nominal Freq. 1 input driven
Line Input (L&R) 250 mVrms ±2dB To Rated Power 1 input driven LFE Input 145 mVrms ±2dB To Rated Power LFE input driven only
Speaker/Hi Level Input 2 Vrms ±2dB To Rated Power (-20 dB below Line In)...1 input driven
Signal to Noise
SNR-A-Weighted 100 dBA 85 rel. to rated power A-Weighting filter
SNR-unweighted 90 dBr 80 rel. to rated power 22k filter
SNR @ 1W-unweighted 60 dBr 55 rel. to 1W Output 22k filter
Residual Noise Floor 1 mVrms 2 Volume @max, using RMS reading 
DMM/VOM (or A/P)
Residual Noise Floor 1
mVrms(max)2 Volume @max, w/ A/P Swept Bandpass 
Measurement (Line freq.+ harmonics)
Input Impedance Line input L&R , LFE >15 K ohms n/a Nominal
Speaker/Hi Level Input 4.7 K ohms n/a Nominal
Filters
Left & Right Low Pass fixed Hz -- ±2dB Slope & Q 4th dB/Octave n/a
LFE Low Pass fixed Hz -- ±2dB Slope & Q 2nd dB/Octave n/a
Subsonic filter (HPF) Hz -- ±2dB Slope & Q 2nd dB/Octave n/a
Limiter YES -- n/a
Features
LFE Input YES functional  BW Limited to 500 Hz
Volume pot Taper (lin/log) log -- functional 
ATO YES functional 
Signal Sensing (ATO)
ATO test Frequency 50 Hz functional
ATO Line Level 2 mV functional
2mV@50Hz into Line Input w/ 1 ch. 
driven
ATO Speaker level input 50 mV fucntional
50mV@50Hz into Line Input w/ 1 ch. 
driven
ATO Turn-on time 5 ms functional Amp connected and AC on, then input 
signal applied
Auto Mute/ Turn-OFF Time 15 minutes functional T before muting, after signal is removed Auto turn of time (T) must be  10 > T 
						

							
SPEAKER CONNECTIONS
Connection Tips

To us e t he b in di ng- post
sp eak er ter minals  on  th e
sub woo fer , uns crew  th e
co lore d c olla r un til t he pa ss
thr ou gh  hol e i n t he c ent er
post is v isi ble  un der t h e
coll ar. I ns ert  t h e b ar e en d of
th e w ire  thr oug h this  hole;
th en s crew  th e c ollar dow n
unt il the  conn ec tion is  tig ht .
The h ole i n t he c en te r o f
eac h c olla r is  int en ded f or
u se w it h  ba nana-ty pe
c onn ec to rs .
 
 
SCS150SI/SCS160SI/SCS180.6S 
3  
						

							
Dolby*Pro Logic*(Non-Digital) – Speaker Level

Use this installation method
for Dolby Pro Logic appli-
cations (not Dolby Digital,
DTS
®or other digital
processing), where the
receiver/processor does not
have a subwoofer output, or 
a volume-controlled preamp
(line-) level output:
Connect your receiver or
amplifier’ s front left and right
speaker terminals to the left
and right terminals on the
subwoofer that are marked
“High Level In.” Connect the
left and right terminals on the
subwoofer that are marked
“High Level Out” to the cor-
responding terminals on the
back of your front left and
right speakers.  
Connect your receiver or
amplifier’ s center, left and
right surround-speaker
terminals to the corre-
sponding terminals on the
back of your center, left and
right surround speakers.

R\fght Front
R\fght Surroun\b
Left Front
Left Surroun\bCenter
+      –+      –
+      – +      –
+      –
+        –
+      –
Left Front Center
+      –
Left Surroun\b R\fght Front
+      –
R\fght Surroun\b
+      –
Subwoofer
Rece\fver
HIGH LEVEL
+               –              –               +L                           R
OUT
IN

 
 
SCS150SI/SCS160SI/SCS180.6S 
4  
						

							
Dolby Pro Logic (Non-Digital) – Line Level

Use this installation method
for Dolby Pro Logic appli-
cations (not Dolby Digital, DTS
or other digital processing),
where the receiver/processor
is equipped with a subwoofer
output, or a volume-controlled
preamp (line-) level output: Use RCA-type patch cords 
to connect the line-level
subwoofer outputs on your
receiver or amplifier to the
line-level inputs on the
subwoofer. IMPORTANT: Do
not use the LFE input on the
subwoofer with DolbyPro Logic processors. Note: If
your receiver or amplifier only
has one subwoofer output
jack, then you will need to use
a Y-connector (not included).
Plug the male end of the Y-
connector into your receiver
or amplifier
’s subwoofer
output jack, and connect each
of the two female ends to
separate RCA-type patch
cords. Finally, plug the RCA-
type patch cords into the line-
level inputs on the subwoofer.
Connect each speaker to 
the corresponding speaker
terminals on your receiver 
or amplifier.
Make sure your receiver or
processor is correctly
configured to indicate that the
subwoofer is  “On. ”
Note for advanced users: If
your receiver/processor has a
built-in low-pass crossover
filter for the subwoofer output,
you may use the LFE input to
bypass the subwoofer ’s
internal crossover.
Use this installation method
for Dolby Digital, DTS or other
digital surround processors: 
Use the line-level input jack
marked  “LFE ” for the Low-
Frequency Effects channel.
Connect this jack to the LFE
output or subwoofer output 
on your receiver or amplifier.
Connect each speaker to the
corresponding speaker terminals on your receiver 
or amplifier.
Make sure that you have
configured your surround-
sound processor for
“
Subwoofer On. ” The front
left, front right, center and
rear speakers should all be
set to  “Small. ”

Dolby Digital or DTS (or Other Digital Surround Mode) Connection

LINE LEVEL IN
LFE INPUT
LFE OUT
L
R
SUBWOOFER
RECEIVER

+       –
+       –
+       –
+       –
+       –
+       –
+       – +       –
+       – +       –
Rece\fver
Subwoofer  Out
Left
Front
Left
Rear R\fght
Front
R\fght Rear
Subwoofer
R        L
R 
L
Center L\fne-
Level In
R\fght Surroun\b R\fght Front
Left Surroun\b Left Front
Center

 
 
SCS150SI/SCS160SI/SCS180.6S 
5  
						

							
OPERATION

MIN        MAX
SubwooferLevel

MIN        MAX
SubwooferLevel

Move the Master Power
switch (marked  “Power ” 
¡
)
to the  “
•” (On) position to use
the subwoofer. The 
subwoofer will automatically
turn itself on or go into
standby (sleep) mode when
left in the standby mode
( “ Auto/On ” switch 

™
in the
“ Auto ” position). When your
receiver or amplifier is off, or is not sending program
material to the subwoofer, 
the subwoofer will be in
standby mode. When the sub-
woofer senses an audio signal,it will automatically turn itself
on. If the subwoofer does 
not sense a signal after
approximately twenty minutes,it will automatically go into
standby mode.When the 
“Auto/On ” switch

™
is switched to the  “On ”
position, the subwoofer will
remain on, whether or not
program material is playing.
If you will be away from
home for an extended period
of time, or if the subwoofer
will not be used, switch the
Master Power switch 

¡
to
the Off position.

Volume

POWER
HIGH LEVEL
+            –            –           + SUBWOOFER
LEVEL
OUT
IN L                        R
LINE LEVEL IN
LFEL
RAUTO              ON
MIN              MAX 
AC 120V~60Hz250 Watts
3.15A/250VTYPE T
£
¡ ™
IMPORTANT: CONNECT STRIPED WIRE  TO RED (    ) SPEAKER TERMINAL.GREEN: ON
RED: STANDBY+
AVIS : RISQUE DE CHOC 
ÉLECTRIQUE-NE PAS OUVRIR
WARNING:  FOR CONTINUED
PROTECTION AGAINST  RISK
OF FIRE, REPLACE ONLY WITH
SAME TYPE 3.15A, 250 VOLT FUSE
AVERTISSEMENT:  UTILISEZ UN
FUSIBLE DE RECHANGE DE MEME TYPE 3.15A, 250V
A Harman International Company
JBL, Incorporated
This area is designed to become quite warm
during normal operationCAUTIONRISK OF ELECTRIC SHOCKDO NOT OPEN
WARNING:  TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, 
DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE.
AVERTISSEMENT:  POUR PRÉVENIR LES RISQUES DINCENDIE 
OU DE CHOC ÉLECTRIQUE, ÉVITER DEXPOSER CET APPAREIL 
A LA PLUIE OU A LHUMIDITÉ. 

Volume can be adjusted
using the Subwoofer Level
Control 

£
(above), as shown
below.

 
 
SCS150SI/SCS160SI/SCS180.6S 
6  
						

							
If there is no sound from any
of the speakers:

• Check that receiver/amplifier
is on and a source is playing.
•  Check that the powered 
subwoofer is plugged in, and
itsPower switch 
¡
is
switched on to the  “
•”
position.
•  Check all wires and con-
nections between receiver/
amplifier and speakers. Make
sure all wires are connected.
Make sure none of the
speaker wires are frayed, 
cut or punctured.
•  Review proper operation of
your receiver/amplifier.

If there is no sound coming
from one speaker:

•  Check the  “Balance ” control
on your receiver/amplifier.
•  Check all wires and con-
nections between receiver/
amplifier and speakers. Make
sure all wires are connected.
Make sure none of the 
speaker wires are frayed, 
cut or punctured.
•  In Dolby Digital or DTS
modes, make sure that the
receiver/processor is
configured so that the speaker
in question is enabled.
•  Turn off all electronics and
switch the speaker in question
with one of the other speakers that is working correctly. Turn
everything back on, and
determine whether the
problem is in the same place,
i.e., the speaker that was
working previously now has
no sound and the speaker that
was not working now sounds
fine; or whether it has moved,
i.e., the speaker that was not
working still has no sound and
the speaker that was working
is still fine. If the problem is in
the same place, the source of
the problem is most likely with
your receiver or amplifier, and
you should consult the owner
’s
manual for that product for
further information.
If the
problem has followed the
speaker, consult your dealer
for further assistance or, if
that is not possible, visit our
Web site at www.jbl.com for
further information.

If there is no sound from the
center speaker:

•  Check all wires and
connections between
receiver/amplifier and
speaker. Make sure all wires
are connected. Make sure
none of the speaker wires are
frayed, cut or punctured.
•  If your receiver/processor is
set in Dolby Pro Logic mode,
make sure the center speaker is not in phantom mode.
•
 If your receiver/processor 
is set in Dolby Digital or DTS
mode, make sure the
receiver/processor is con-
figured so that the center
speaker is enabled.

If the system plays at low
volumes but shuts off as
volume is increased:

•  Check all wires and con-
nections between receiver/
amplifier and speakers. Make
sure all wires are connected.
Make sure none of the 
speaker wires are frayed, cut
or punctured.
•  If more than one pair of main
speakers is being used, check
the minimum impedance
requirements of your
receiver/amplifier.

If there is low (or no) bass
output:

•  Make sure the connections
to the left and right  “Speaker
Inputs ” have the correct 
polarity (+ and  –).
•  Make sure the subwoofer 
is plugged into an active
electrical outlet.
•  Make sure the powered
subwoofer is plugged in
, and
itsPower switch 
¡
is
switched on to the  “
•”
position.

TROUBLESHOOTING

•  In  Dolb y D ig it a l o r D TSmo des, ma ke sure  yo urre ceiv e r/ pro ces s or i sconf igured s o th at  thesub woo fer  an d LF E  ou tp utar e en abled.
 
 
SCS150SI/SCS160SI/SCS180.6S 
7  
						

							
 
SUB150/160/180 EXPLODED VIEW 
 
 
 
 
 
 
Ref# Description  Part Number Qty 
     
1  SUB150/160/180 CABINET  NOT FOR SALE  1 
2  FOOT – MAIN PLASTIC BODY  (SCS150SI)   WI5447  4 
  “  (SCS160SI)   321-ABS-00008  4 
  “  (SCS180.6)   321-ABS-00008-0LA  4 
3  FOOT – RUBBER BOTTOM  (SCS150SI)   WI5448  4 
  “  (SCS160SI/180.6)   321-ABS-00009  4 
4  FOOT SCREW  T4*30L  06-T43005  4 
5 10” WOOFER  25MF12DZB-DW02 1 
6  AMPLIFIER/WOOFER  SCREWS  T4*20L  06-T4205012  15 
7  SUB150/160/180 AMPLIFIER  NOT FOR SALE  1 
 
 
8  
						

							
 
Test Set Up and Procedure 
 
 
 
Equipment needed: 
 
•   Function/signal generator/sweep generator 
•  Integrated Amplifier 
•  Multimeter 
•  Speaker cables 
 
General Unit Function (UUT = Unit Under Test) 
 
1)  From the signal generator, connect one line level (RCA) cable to the Subwoofer Line Level Input jacks L/R 
on the UUT. Use a Y-cable from a mono source if necessary to connect to both inputs. Do not connect to 
the single LFE input. 
2)  Turn on generator; adjust to  100mV, 50 Hz. 
3)  Plug in UUT; turn the power switch ON. LED should switch from Red to Green. Turn LEVEL control full  clockwise (MAX) 
4)  LED should Green; immediate and vigorous bass response should be heard and felt from port tube  opening. 
5)  Turn off generator, turn LEVEL control full counterclockwise (MIN), and disconnect RCA cable. 
6)  Connect one pair
 of speaker cables to Speaker Level input terminal (IN) on UUT. Cables should be 
connected to an integrated amplifier fed by the signal generator. 
7)  Turn on generator and adjust so that speaker level input at the amplifier is  2.0V, 50 Hz. Turn LEVEL control 
full clockwise. 
8)  Green LED should light; immediate and vigorous bass response should be heard and felt from the port  tube opening. 
 
Sweep Function 
 
1)  Follow steps 6-8 above, using a sweep generator as a signal source. 
2)  Sweep generator from 20Hz to 300Hz. Listen to the cabinet and drivers for any rattles, clicks, buzzes or any other noises. If any unusual noises are heard, remove woofers and test. 
 
Driver Function 
 
1)  Remove woofer from cabinet (instructions on exploded view drawing); detach + and - wire clips. 
2)  Check DC resistance of woofer; it should be  3.4 ohms ±10% 
3)  Connect a pair of speaker cables to driver terminals. Cables should be connected to an integrated amplifier  fed by a signal generator. Turn on generator and adjust so that speaker level output is  5.0V. 
4)  Sweep generator from 20Hz to 1kHz. Listen to driver for any rubbing, buzzing, or other unusual noises. 
SCS150SI/SCS160SI/SCS180.6S             
9