JBL SUB-300 Service manual
Surround Cinema
SUB300
Amplifier/Subwoofer
SERVICE MANUAL
JBL Consumer Products
250 Crossways Park Dr.
Woodbury, New York 11797 Rev
2 10/2005
1
Note: The SUB300 is part of the SCS300. 7 system
Satellite loudspeakers SCS300SAT: order JBL part# SCS300SAT-1
Center channel SCS300CEN: order JBL part# SCS200/300CEN-1
- CONTENTS -
BASIC SPECI FI C ATI ONS……………….….….….….…………….1
DETAILED SPECIFICATIONS ……..…………….……………..2
OPERATION ………….……………………………..…………….4
CONNECTIONS..………………………..………….…….………...5
BASIC TROUBLESHOOTING…..…………….….….…….……...7
TEST SET-UP AND PROCEDURE……………………………….8
EXPLODED VIEW/PARTS LIST…………………………………..9
BLOCK DIAGRAM..…………………………………………….....10
PCB DRAWINGS………………..………………………………...11
120V ELECTRICAL PARTS LIST ………………..……………..13
230V ELECTRICAL PARTS LIST …………………..…………..16
INTEGRATED CIRCUIT/TRANSISTOR PINOUTS.................19
120V SCHEMATICS.………..………………….………. ………20
230V SC H EMATICS.………..…………………….……. ………23
PACKAGING…………………………….………………………...25
BASIC SPECIFI C ATIONS
SUB300 Subwoofer
Configuration: Floor-firing, bass-reflex ported enclosure
Woofer: 10" (254mm) cone
Amplifier Power output: 150W Continuous RMS power
Frequency response: 30Hz – 120Hz (-6dB)
Dimensions (including feet): 20 x 13 ¾ x 15 ¾” (508 x 349 x 400mm)
Weight: 35 lb/15.9kg
Occasional r efinements may be made to existing produc ts without noti c e but will always meet or exceed original
specifications unl ess otherwise stated
P
SUB300 (SCS300.7sys)
2
JBL SUB 300 150W Powered Sub/ Plate Amp
LINE VOLTAGE Yes/No Hi/Lo Line Unit Notes
Parameter Specification Unit
Amp Section
Type (Class AB, D, other) D D
Load Impedance (speaker) 4 Ohms
Rated Output Power 150 Watts
THD@ Rated Power 0.5 %
THD @ 1 Watt 0.1 %
DC Offset 10 mV-DC
Damping factor >100 DF
Input Sensitivity
Signal to Noise
SNR-A-Weighted 100 dBA
SNR-unweighted 90 dBr
SNR @ 1W-unweighted 60 dBr
Residual Noise Floor 1 mVrms
Residual Noise Floor 1
US 120VAC/60Hz Yes 108-132 Vrms
Asia 100VAC/50Hz Yes 90-110 Vrms
EU 230VAC/50-60Hz Yes 207-264 Vrms Normal Operation Normal operation, MOMS required
QA Test
Limits Conditions Notes
N/A
N/A Nominal
140 1 input driven
0.3 22KHz filter
Input Frequency 50 Hz
Line Input (L&R) 250 mVrms
LFE Input 145 mVrms
Speaker/Hi Level Input 2.5 Vrms
mVrms(max)
±2dB To rated power 1 input driven
±2dB To rated power LFE input driven only
±2dB To rated power (-20 dB below Line In)...1 input driven
Normal Operation
Normal Operation
1 22KHz filter
50 @ Speaker Outputs
30
50 Nominal Freq. 1 input driven
85 rel. to rated power A-Weighting filter
80 rel. to rated power 22KHz filter
55 rel. to 1W Output 22KHz filter
Volume @max, using RMS reading
2
DMM/VOM (or A/P)
Volume @max, w/ A/P Swept
Bandpass Measurement (Line freq.+
2
harmonics)
Measured at speaker terminals, Output
power 140 Watts THD 0.1 %
Input Impedance
Line input L&R , LFE >10 K ohms
Speaker/Hi Level Input 4.7 K ohms
Filters
Left & Right Low Pass fixed Hz --
LFE Low Pass fixed Hz --
Subsonic filter (HPF) Hz --
Limiter (yes/no) YES -THD at Max. Output Power N/A --
Features
LFE Input YES
Volume pot Taper (lin/log) log -ATO YES
Input Configuration
Line In (L,R) L ,R -Line level in LFE LFE
Spkr/Hi Level In
Spkr Out: Level out (L,R)Hi
Signal Sensing (ATO)
ATO test Frequency 50 Hz
ATO Line Level 2 mV
ATO Speaker level input 50 mV
ATO Turn-on time 5 ms
Auto Mute/ Turn-OFF Time 15 minutes
Slope & Q 4th dB/Octave
Slope & Q 2nd dB/Octave
Slope & Q 2nd dB/Octave
(L,R)
L,R -L,R
N/A Nominal
N/A Nominal
±2dB
N/A
±2dB
N/A
±2dB
N/A
N/A
N/A
functional BW Limited to 500 Hz
functional
functional
functional RCA inputs: L , R Summed to Mono
functional
functional L R Summed to Mono
functional Direct by pass from Speaker in
functional
functional
fucntional
functional
functional
2mV@50Hz into Line Input w/ 1 ch.
driven
50mV@50Hz into Line Input w/ 1 ch.
driven
Amp connected and AC on, then input
signal applied
T before muting, after signal is
removed Auto turn of time (T) must be 10 > T <15
Power on Delay time 3 sec.
functional AC Power Applied
SUB300 (SCS300.7sys)
3
Parameter Specification Unit
Transients/Pops
ATO Transient 5 mV-peak
Turn-on Transient 50 mV-peak
Turn-off Transient 50 mV-peak
Efficiency
Stand-by Input Power 14 Watts
Power Cons.@rated power 250 Watts
Protection
Short Circuit Protection YES --
Thermal Protection 65 deg. C -DC Offset Protection YES -Line Fuse Rating
US Version 2.5 Amps
EU Version 1.6 Amps
QA Test
Limits Conditions Notes
10 @ Speaker Outputs
100 @ Speaker Outputs AC Line cycled from OFF to ON
100 @ Speaker Outputs AC Line cycled from ON to OFF
Maximum allowable input power under
15 @ nom. line voltage
260 @ nom. line voltage
functional Direct short at output
functional @1/8 max unclipped Power
functional DC present at Speaker Out leads Relay or crowbar (for driver/fire
Type-T or Slo Blo
Type-T or Slo Blo
nominal Input voltage and frequency,
HOT or COLD operation.
150 Watts @ 4 Ohms nominal line voltage
Temperature rise should not exceed 35K
rise
External fuse with UL/SEMKO rated
holder
External fuse with UL/SEMKO rated
holder
10
OPERATION
MIN MAX
Subwoofer
Level
MIN MAX
Subwoofer
Level
Move the Master Power switch
(marked “Power”
å) to the “•”
(On) position to use the subwoofer. The SUB300 subwoofer
will automatically turn on or go
into standby (sleep) mode
when left in the auto mode
(“Auto/On” switch
ç 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
(LED will be red). When the
sub
woofer senses an audio sig-
nal,
it will automatically turn on
(LED will be green). If the subwoofer does not sense a signal
after
approximately 20 minutes,
it will automatically go into
standby mode.
When the “Auto/On” switch
ç
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
å to the Off position.
VOLUME
Volume may be adjusted
using the Subwoofer Level
control
∫ as shown.
SUB300 (SCS300.7sys)
4
CAUTION
CAUTION
RISK OF ELECTRIC SHOCK
RISK OF ELECTRIC SHOCK
RISK OF ELECTRIC SHOCK
DO NOT OPE N
DO NOT OPE N
DO NOT OPE N
ç
∫
å
8
DOLBY PRO LOGIC* (NON-DIGITAL)
–
LINE LEVEL
Use this installation method
for Dolby Pro Logic applications (not Dolby Digital, DTS
or other digital processing),
where the receiver/processor is equipped with a subwoofer output, or a volumecontrolled preamp (line-)
level output:
Use RCA-type interconnects
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 Dolby Pro 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 interconnects.
Finally, plug the RCA-type
interconnects into the linelevel 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.” Also configure
your receiver for 5.1-, 6.1or 7.1-channel operation as
appropriate. The front left,
front right, center and rear
speakers should all be set to
“Small.” If your receiver
allows you to set the
crossover frequency
between the subwoofer and
the main speakers, select
100Hz or the setting that is the
closest frequency below it.
DOLBY* DIGITAL OR DTS
®
(OR OTHER DIGITAL SURROUND MODE) CONNECTION
LINE
LEVEL
IN
LFE
L
R
LFE OUT
SUBWOOFER
RECEIVER
– +
– +
– +
– +
– +
– +
– +
– +– +
Receiver
Subwoofer
Out
Left
Front
Left
Surround
– +
Right
Front
Right
Surround
Subwoofer
R L
Center
Surround Back
Left
Line-
Level In
Right Surround
Right Front
Left Surround
Left Front
Center
R
L
– +
Surround Back
Left
– +
– +
Surround Back
Right
– +
Surround Back
Right
SUB300 (SCS300.7sys)
5
9
DOLBY PRO LOGIC (NON-DIGITAL) –SPEAKER LEVEL
Use this installation method
for Dolby Pro Logic applications (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
“Speaker Level In.” Connect
the left and right terminals on
the subwoofer that are
marked “Speaker Level Out”
to the corresponding terminals on the back of your front
left and right speakers.
Connect your receiver or
amplifier’s center, surround
and surround back speaker
terminals to the corresponding terminals on the back of
your center and surround
speakers.
Right Front
Right Surround
Left Front
Left Surround
Center
– + – +
– +
– + – +
– +
– +
– + – +
– +
Left Front Center
Left Surround
Right Front
Right Surround
Surround Back
Left
Surround Back
Left
Subwoofer
Receiver
SPEAKER LEVEL
L R
OUT
IN
+ – – +
– +
– +
Surround Back
Right
Surround Back
Right
– + – +
SUB300 (SCS300.7sys)
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 its
Power switch å is
switched on (“•” position).
• Check all wires and connections between receiver/
amplifier and speakers.
Make sure all wires are connected. Make sure none of
the speaker wires are
frayed, cut or punctured, or
touching each other.
• 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 connections between receiver/
amplifier and speakers.
Make sure all wires are connected. Make sure none of
the speaker wires are
frayed, cut or punctured, or
touching each other.
• 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
has followed the speaker, or
has remained in the same
channel. If the problem is
in the same channel, 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 www.jbl.com.
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, or touching each other.
• 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 one of the Dolby
Digital or DTS
modes, make
sure the receiver/
processor
is configured 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 connections between receiver/
amplifier and speakers.
Make sure all wires are connected. Make sure none of
the speaker wires are
frayed, cut or punctured, or
touching each other.
• 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
, and is
turned on (Power switch
å in the “
•
” position).
• In Dolby Digital or DTS
modes, make sure your
receiver/processor is configured so that the subwoofer
and LFE output are enabled.
If there is no sound from
the surround speakers:
• Check all wires and connections between receiver/
amplifier and speakers.
Make sure all wires are connected. Make sure none of
the speaker wires are
frayed, cut or punctured, or
touching each other.
• Review proper operation of
your receiver/amplifier and
its surround sound features.
• Make sure the movie or
TV show you are watching
is recorded in a surround
sound mode. If it is not,
check to see whether your
receiver/amplifier has other
surround modes you may use.
•
In Dolby Digital or DTS
modes, make sure your
receiver/processor is configured so that the surround
speakers are enabled. When
five satellites are in use,
remember to configure your
receiver or processor for
6.1-channel operation, and
when all six satellites are in
use, configure your receiver
or processor for 7.1 channels.
• Review the operation of
your DVD player and the
jacket of your DVD to make
sure that the DVD features
the desired Dolby Digital or
DTS mode, and that you
have properly selected that
mode using both the DVD
player’s menu and the DVD
disc’s menu.
TROUBLESHOOTING
11
SUB300 (SCS300.7sys)
7
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