Test Procedures ....................................................................................................................... 45-48
IC Diagrams ............................................................................................................................... 49-50
Service Manual Revision History .................................................................................................51
2
Safety Information
1. Parts that have special safety characteristics are identified by the symbol on schematics
or by special notes on the parts list. Use only replacement parts that have critical characteristics
recommended by the manufacturer.
2. Make leakage current or resistance measurements to determine that exposed parts are
acceptably insulated from the supply circuit before returning the unit to the customer.
Use the following checks to perform these measurements:
A. Leakage Current Hot Check-With the unit completely reassembled, plug the AC line cord
directly into a 120V AC outlet. (Do not use an isolation transformer during this test.) Use a
leakage current tester or a metering system that complies with American National Standards
Institute (ANSI) C101.1 "Leakage Current for Appliances" and Underwriters Laboratories (UL)
6500 / IEC 60056 paragraph 9.1.1. With the unit AC switch first in the ON position and then in
OFF position, measure from a known earth ground (metal waterpipe, conduit, etc.) to all exposed metal parts of the unit (antennas, handle bracket, metal cabinet, screwheads, metallic
overlays, control shafts, etc.), especially any exposed metal parts that offer an electrical return
path to the chassis. Any current measured must not exceed 0.5 milliamp. Reverse the unit
power cord plug in the outlet and repeat test. ANY MEASUREMENTS NOT WITHIN THE
LIMITS SPECIFIED HEREIN INDICATE A POTENTIAL SHOCK HAZARD THAT MUST BE
ELIMINATED BEFORE RETURNING THE UNIT TO THE CUSTOMER.
B. Insulation Resistance Test Cold Check-(1) Unplug the power supply and connect a jumper
wire between the two prongs of the plug. (2) Turn on the power switch of the unit. (3) Measure
the resistance with an ohmmeter between the jumpered AC plug and each exposed metallic
cabinet part on the unit. When testing 3 wire products, the resistance measured to the product
enclosure should be between 2 and infinite MOhms. Also, the resistance measured to exposed
input/output connectors should be between 4 and infinite MOhms. When testing 2 wire products, the resistance measured to exposed input/output connectors should be between 4 and
infinite MOhms. If it is not within the limits specified, there is the possibility of a shock hazard,
and the unit must be repaired and rechecked before it is returned to the customer.
CAUTION: The Bose® L1® Compact system contains
no user-serviceable parts. To prevent warranty infractions,
refer servicing to warranty service stations or factory service.
PROPRIETARY INFORMATION
THIS DOCUMENT CONTAINS PROPRIETARY INFORMATION OF
BOSE CORPORATION WHICH IS BEING FURNISHED ONLY FOR
THE PURPOSE OF SERVICING THE IDENTIFIED BOSE PRODUCT
BY AN AUTHORIZED BOSE SERVICE CENTER OR OWNER OF
THE BOSE PRODUCT, AND SHALL NOT BE REPRODUCED OR
USED FOR ANY OTHER PURPOSE.
W arranty
The Bose L1 Compact Power Stand is covered by a limited 2-year transferable warranty.
The L1 Compact Array and the Power Stand woofer are covered by a 5-year limited warranty.
3
Specifications
Mechanical
PartDimensionsWeight
L1 Compact Power Stand with16.5” H x 13.25” W x 16.75” D24.6 lbs (11.2 kg)
Loudpseaker Array(41.8 cm x 33.9 cm x 42.6 cm)
L1 Compact Loudpseaker Array 16” H x 2.75” W x 2.75” D3.0 lbs (1.35 kg)
(40.8 cm x 7 cm x 7.1 cm)
L1 Compact Extensions (2)32.5” H x 2.75” W x 2.75” D2.3 lbs (1.05 kg) each
Collapsed Position16.5” H x 13.25” W x 16.75” D24.6 lbs (11.2 kg)
(assembled)(41.8 cm x 33.9 cm x 42.6 cm)
Extended Position78.5” H x 13.25” W x 16.75” D29.2 lbs (13.3 kg)
(assembled)(199.5 cm x 33.9 cm x 42.6 cm)
Shipping CartonsWeight
L1 Compact System (no extensions)30.4 lbs (13.8 kg)
L1 Compact Extensions7.5 lbs (3.4 kg)
Electrical
AC Power Rating
100 - 240 VAC ~ 50/60 Hz, 200W max
Peak Inrush Current
230V: 18.2 Amps
120V: 9.7 Amps
4
Electrostatic Discharge Sensitive (ESDS)
Description Bose®
Vendor Part
Description Bose® Part Number
Device Handling
This unit contains ESDS devices. We recommend the following precautions when repairing,
replacing or transporting ESDS devices:
• Perform work at an electrically grounded work station.
• Wear wrist straps that connect to the station or heel straps that connect to conductive
floor mats.
• Avoid touching the leads or contacts of ESDS devices or PC boards even if properly
grounded. Handle boards by the edges only.
• Transport or store ESDS devices in ESD protective bags, bins, or totes. Do not insert
unprotected devices into materials such as plastic, polystyrene foam, clear plastic bags,
bubble wrap or plastic trays.
Part List Notes
1. This part is not normally available from Customer Service. Approval from the Field Service
Manager is required before ordering.
2. The individual parts located on the PCBs are listed in the Electrical Part List.
3. This part is critical for safety purposes. Failure to use a substitute replacement with the
same safety characteristics as the recommended replacement part might create shock, fire
and/or other hazards.
4. This part is referenced for informational purposes only. It is not stocked as a repair part. Refer
to the next higher assembly for a replacement part.
L1 Compact Power Stand, 120V (US) 318882-1100
L1 Compact Power Stand, 220V (China) 318882-2100
L1 Compact Power Stand, 100V (Japan) 318882-3100
L1 Compact Power Stand, 230V (Euro) 318882-4100
L1 Compact Power Stand, 240V (UK) 318882-5100
5
Product Description
Loudspeaker
Array
Whether you are a musician amplifying your instruments, a mobile DJ entertaining an audience,
or the host of your own special event, the Bose® L1® Compact Portable Line Array System will
provide quality sound for audiences of approximately 100 people.
Features Include
• Carry it in one trip – The entire system is light enough to be carried in a single trip.
• Set it up in one minute – The interlocking components of the L1 Compact system allow system
setup in less than a minute. There are no external speaker wires required. An integrated bass
enclosure with an intuitive user interface eliminates the need for separate components.
• Fill the room with one loudspeaker – Whether you’re performing live or playing back prerecorded music, whether you’re performing in a coffeehouse or a 100-seat room, Bose Spatial
Dispersion™ loudspeaker technology provides nearly 180º of tonally balanced sound coverage
so there are no dead spots.
• PA and monitor combined – Audience members enjoy a more consistent and intimate listening
experience because the system sets up behind the performer and serves as both the monitor for
the stage and amplification system for the audience. The performer alone controls the sound.
• Versatility – In addition to musical performances, the L1 Compact provides quality sound for a
wide variety of general-purpose uses including presentations, celebrations, speeches, and
music playback for about 100 people.
• Integrated ToneMatch® signal processing – Provides a high level of tone customization on your
microphone or acoustic guitar to provide a listening experience that most musicians only achieve
using a recording studio.
• Two setup options – The L1 Compact system can be used in either the collapsed position for
smaller audiences or extended positions for larger audiences.
The L1 Compact Portable Line Array
System is shipped in two cartons.
The L1 Compact system consists of:
• L1 Compact Power Stand
• L1 Compact Loudspeaker Array
• L1 Compact Extensions
The L1 Compact system comes with
a slipcover for the Power Stand and
a padded carry bag for the L1 Compact Extensions.
Power stand cartonExtensions carton
L1®Compact Power Stand
with Loudspeaker Array
AC power cord
Power Stand slipcover
L1®Compact Extensions
Extensions carry bag
6
Product Description
Smaller audiences
• Intimate acoustic performances
• Music playback
• Presentations
• Speeches
Larger audiences
•Musical pe
rformances
–
auditorium/coeehouse
• DJ events
• Announcements
–
larger spaces
Collapsed position
Loudspeaker
Power
Extended position
Power Stand
Array
Extension
Extension
Stand
Ta b l e t o p
Array
Loudspeaker
2
3
System configurations
You can set up the L1
®
Compact system in two unique positions. The examples below will help
you quickly identify the position that can
work best for you.
The L1 Compact Extensions are not required when using the L1 Compact Portable
Line Array System in the collapsed position.
They are included for situations where you
need to elevate the Loudspeaker Array to
project sound to larger audiences.
Extending the Loudspeaker Array
Once you have set the system in place:
1.Slide the Loudspeaker Array up and
out of the Power Stand and temporarily lay it aside.
Note: The two L1 Compact Extensions are identical to each other.
1
2
2.Align the plug on the bottom of the
Extension with the socket on the
Power Stand, then slide the extension
into the power stand.
3.Align the remaining Extension and
push it firmly in place.
4.Align the Loudspeaker Array and
push it firmly in place.
Connecting power to the system
1.Make sure the power switch is off
(down position).
2.Plug one end of the power cord into
the connector on the power stand.
3.Plug the other end into a live electrical receptacle.
4.Before turning the system on,
connect your sound sources.
4
3
1
7
Product Description
Channel 1
Channel 2
1
2
3
4
5
6
7
8
9
10
11
12
Connections and controls
The power stand control panel provides all the necessary connectors, controls, and indicators
for operation.
(Microphone input)
The channel 1 input is for use only with a
microphone. Integrated ToneMatch
®
signal
processing provides a high level of tone
customization to provide a listening experience
that most musicians can only achieve using a
recording studio.
1. S igna l/Clip indic ator – Displays the input
signal status in color.
• Green: Input signal present
• Red: Input signal clipping
2. V olume contr ol – Adjusts the volume of your
microphone.
3. Treble control – Adjusts the amount of treble
on your microphone.
4. B ass c ontr ol – Adjusts the amount bass on
your microphone.
5. Microphone input – Analog input for
connecting a balanced XLR microphone cable. A
ToneMatch microphone preset is built in.
(Utilit y cha nne l – multip le input)
6. S igna l/Clip indicator – Displays the input
signal status in color.
• Green: Input signal present
• Red: Input signal clipping
7.V olume contr ol – Adjusts the overall volume of
all input sources connected to Channel 2.
8. 1/8-inch stereo input – Stereo analog input
for connecting audio sources such as portable
mp3 players, satellite radio, laptop computers,
video projectors, and smart boards. Left and right
inputs are summed by the power stand.
9. RCA stereo input – Analog input for
connecting audio sources such as DVD players,
VCR players, video game consoles, DJ mixers,
Keyboards and other instruments. For best
results, connect both the left and right signals.
Left and right inputs are summed by the power
stand.
10. 1/4-inch input – Balanced analog input for
connecting guitars and other instruments.
Accepts either 1/4-inch TRS balanced or TS
unbalanced cables.
11. ToneMatch switch – When connecting an
acoustic guitar to the 1/4-inch input, move the
switch to the position to enable a ToneMatch
preset. When connecting anything other than an
acoustic guitar to the 1/4-inch input, move the
switch down to the Line Level position.
12. Power LED – Indicates power status.
Blue: Power on
8
Packaging Part List
L1 Compact Power Stand (includes Array) (see Figure 1)
on the Input / Output PCB are extremely
sensitive to ESD damage. Be sure to use an
approved and tested ESD strap that is
properly grounded to your work bench before
attempting disassembly or repair of the L1
Compact Power Stand.
1. Top Cover Removal
1.1 Remove the two screws that secure the
Power Stand handle to the top cover. Lift off
the handle.
1.2 Lift up on the top cover. Unplug the two
cable harnesses from the I/O board at
connector CNxxx and from the line output
card at connector CN302B. Lift off the top
cover.
Re-assembly Note: Be sure the woofer
grilles are properly aligned into the front
groove of the top cover before re-installing
the handle.
38
Disassembly Procedures
2. Input / Output PCB Removal
CAUTION: The SMD integrated circuits used
on the Input / Output PCB are extremely
sensitive to ESD damage. Be sure to use an
approved and tested ESD strap that is
properly grounded to your work bench before
attempting disassembly or repair of the L1
Compact Power Stand.
2.1 Perform procedure 1.
2.2 Remove the four knobs (volume 1,
volume 2, treble, bass) on the Input/Output
panel.
2.3 Remove the following items from the
top cover:
•two screws at the microphone jack.
•one screw at the RCA input jacks.
•ring at the 3.5mm input jack.
•hex nut at the 1/4” input jack.
2.4 Turn over the top cover. Remove the four
screws that secure the I/O board. Lift off the
board.
3. Jack Input PCB Removal
Note: The jack input PCB is a plug-in
daughter card located on the I/O PCB.
3.1 Perform procedure 2.
3.2 Unplug the jack input PCB from the I/O
PCB at connector CN308A. Lift off the board.
39
Disassembly Procedures
Input/Output PCB Re-assembly Note:
Be sure that the LED lightpipes are properly
aligned with the holes in the PCB and the
openings in the top cover when re-installing
the I/O PCB assembly.
4. Line Output Card Removal
4.1 Perform procedure 1.
4.2 Remove the one screw at the RCA jacks
and the plastic nut at the 1/4” jack.
4.3 Remove the one screw that secures the
line output card to the metal plate. Lift out the
card.
5. Power Amplifier / SMPS PCB Removal
5.1 Remove the six screws that secure the
rear access panel. Lift off the panel.
40
Disassembly Procedures
5.2 Remove the four screws that secure the
power amplifier / SMPS PCB assembly to
the power stand’s mounting bracket.
5.3 Carefully slide the power amplfier / SMPS
PCB downward until the top of the board
clears the upper part of the bracket.
5.4 Slide the PCB assembly out through the
access panel opening and disconnect the
four wire harnesses. Lift out the board.
Re-assembly Note: The power amplifier /
SMPS PCB assembly with the heatsink
attached should slide up between the plastic
cabinet housing and the metal cavity bulkhead bracket. Once it is in the correct location, secure it in place with the four screws
removed in step 5.2.
41
Disassembly Procedures
6. AC Inlet and Power Switch Removal
6.1 Perform procedure 5.
6.2 Disconnect the three wires that connect
to the AC inlet jack. Remove the two screws
that secure the AC inlet to to the cabinet. Lift
out the jack.
6.3 Disconnect the two wires that connect to
the AC power switch. Lift out the switch
Note: The AC inlet and power switch are
secured to the cabinet with glue to prevent
air leaks. Be sure to re-seal the new parts.
7. Woofer Removal
7.1 On the bottom of the Power Stand,
remove the four screws located toward the
center of the plastic foot. These are not the
screws that hold the rubber feet in place.
7.2 Remove the four screws that secure the
bottom of the array connector housing to the
foot. Lift off the plastic foot.
7.3 Lift out the woofer grilles and set them
aside.
42
Disassembly Procedures
7.4 Remove the one screw that secures the
array guide to the cabinet. Slide the array
guide down and out from in front of the
woofer.
7.5 Remove the fours screws that secure
the woofer to the cabinet. Lift out the woofer.
Disconnect the two faston connectors from
the woofer.
Re-assembly Note: Be sure to align the
woofer grilles to the slots in the top cover and
the plastic foot when replacing the foot.
L1 Compact Array Procedures
1. Grille Removal
1.1 Grasp the grille and carefully pull it away
from the array. Lift off the grille.
Re-assembly Note: Be sure there is suffi-
cient damping material in the array grooves
to retain the grille and prevent buzzes.
Perform the array sweep tests after replacing the grille.
43
Disassembly Procedures
2. Driver Removal
2.1 Perform procedure 1.
2.2 Remove the four screws that secure the
driver to the baffle. Lift out the driver.
2.3 Cut the wires as close to the driver
terminals as possible.
Re-assembly Note: Be sure to observe
polarity when re-connecting the driver wires.
There may be more than one wire per
connection.
3. Logo Removal
3.1 Perform procedure 1.
3.2 Unbend the legs of the logo and lift it off
the grille.
Array Extensions
Note: The array extensions are not repair-
able. If damaged they must be replaced.
44
Test Procedures
L1® Compact Power Stand Tests
CAUTION: The SMD integrated circuits used
on the Input / Output PCB are extremely
sensitive to ESD damage. Be sure to use an
approved and tested ESD strap that is
properly grounded to your work bench before
attempting disassembly or repair of the L1
Compact Power Stand.
Equipment Required
• dB Meter
• Digital Multi-meter
• Audio Signal Generator
• Distortion Meter
• 2 - 4 Ohm, 50 Watt Load Resistors
• Test cables, see Appendix
Note:
• Channel 1 refers to the left Side of the
power stand input panel that has the XLR
Microphone Jack. Channel 2 refers to the
right side with the TRS (1/4”), RCA and 1/8”
input jacks.
• When testing Channel 1, turn Channel 2
Volume to Min. When testing Channel 2, turn
Channel 1 Volume to Min.
Note: The following tests will check the
performance of the Input PCB, I/O PCB and
the Output PCB assemblies
1. Channel 1 LED/Gain Test
1.1 Using an XLR cable, apply a balanced,
1kHz, -50dBV (3.16mVrms) sine wave to the
channel 1 XLR microphone input. Adjust the
volume control so that you measure the
-50dBV output level at the 1/4” balanced line
output jack on the back of the power stand.
1.2 While measuring the output level at the
1/4” balanced line output jack, increase the
volume level on the channel 1 input and
verify that the LED functions, and record the
levels at which the trim LED’s color states
change. The LED should turn green at
-30 +/-2dBV (31.6mVrms), and red at 0 +/-2
dBV (1Vrms).
2. Channel 2 LED/Gain Test
2.1 Set the channel 2 ToneMatch switch to
the OFF position (down).
2.2 Using an balanced TRS cable, apply a
balanced, 1kHz, -50dBV (3.16mVrms) sine
wave to the channel 1 balanced 1/4” input
jack. Adjust the volume control so that you
measure the -50dBV output level at the 1/4”
balanced line output jack on the back of the
power stand.
2.3 While measuring the output level at the
1/4” balanced line output jack, increase the
volume level on the channel 2 input and
verify that the LED functions, and record the
levels at which the trim LED’s color states
change. The LED should turn green at
-30 +/-2dBV (31.6mVrms), and red at 0 +/-2
dBV (1Vrms).
2.4 Repeat steps 2.2 and 2.3 for the
channel 2 unbalanced RCA and 1/8” stereo
input jacks.
3. Channel 2 Line Output Test
3.1 Set the channel 2 ToneMatch switch to
the OFF position (down). Set the channel 2
volume control to maximum.
3.2 Using an balanced TRS cable, apply a
balanced, 1kHz, -41dBV (9mVrms) sine
wave to the channel 2 balanced 1/4” input
jack.
3.3 Measure the output level at the
1/4” balanced line output jack. It should be
0dBV +/- 1dBV (1Vrms).
3.4 Measure the output level at the unbal-
anced RECORD output RCA jacks. It should
be -6dBV +/- 1dBV (0.5Vrms).
3.5 Apply a, 1kHz, -24dBV (63mVrms) sine
wave to both of the channel 2 RCA input
jacks.
45
Test Procedures
3.6 Measure the output level at the
1/4” balanced line output jack. It should be
0dBV +/- 1dBV (1Vrms).
3.7 Measure the output level at the unbalanced RECORD output RCA jacks. It should
be -6dBV +/- 1dBV (0.5Vrms).
3.8 Repeat steps 3.5 to 3.7 for the channel
2 1/8” stereo input jack.
4. Channel 1 EQ Frequency Response
Test
4.1 Set the channel 1 volume control to
maximum (fully CW). Set the bass and treble
tone controls to 12 o’clock (straight up).
4.2 Apply a balanced 1kHz, -55dBV
(1.8mVrms) sine wave to the XLR microphone input.
4.3 Measure the output level at the 1/4”
balanced Main output on the back of the
power stand. It should be -4.5dB +/- 1.5dB
(0.6Vrms).
4.4 Reference a dB meter to the output
level at 1 kHz. Ensure that the frequency
response is within the limits listed in the
following table.
Frequency Output Level
50 Hz -11.1 dBr +/- 2.0 dB
65 Hz -5.4 dBr +/- 1.5 dB
100 Hz +0.9 dBr +/- 1.5 dB
150 Hz -1.0 dBr +/- 1.5 dB
300 Hz -4.4 dBr +/- 1.5 dB
550 Hz -6.6 dBr +/- 1.5 dB
1 kHz REFERENCE
1.5 kHz +2.5 dBr +/- 1.5 dB
3 kHz +5.5 dBr +/- 1.5 dB
10 kHz +2.6 dBr +/- 1.5 dB
18 kHz +0.2 dBr +/- 2.0 dB
5. Channel 2 ToneMatch Not Active EQ
Check
5.1 Set the channel 2 volume control to the
12 o’clock position. Set the ToneMatch
switch to the OFF position (down).
5.2 Using a balanced TRS cable, apply a
50HZ, -50dBV (3.16mVrms) sine wave to the
1/4” balanced TRS input jack.
5.3 Sweep the audio input from 50Hz to
15kHz. Measure the output level at the Main
output jack on the back of the power stand
using a balanced TRS cable. V erify that the
audio bandwidth is 50Hz to 15kHZ, +/- 1dB.
6. Channel 2 ToneMatch Active EQ Frequency Response Test
6.1 Set the channel 2 volume control to the
MAXIMUM (fully CW) position. Set the
ToneMatch switch to the ON position (up).
6.2 Using a balanced TRS cable, apply a
1 kHZ, -40dBV (10mVrms) sine wave to the
1/4” balanced TRS input jack.
6.3 Measure the output level at the 1/4”
balanced Main output on the back of the
power stand. It should be -2.8dB +/- 1.5dB
(0.72Vrms).
6.4 Reference a dB meter to the output level
at 1 kHz. Ensure that the frequency response is within the limits listed in the following table.
Frequency Output Level
74 Hz -3.9 dBr +/- 1.5 dB
120 Hz +1.2 dBr +/- 1.5 dB
250 Hz +2.3 dBr +/- 1.5 dB
515 Hz -4.0 dBr +/- 1.5 dB
725 Hz -5.0 dBr +/- 1.5 dB
1 kHz REFERENCE
2 kHz +3.1 dBr +/- 1.5 dB
4 kHz +4.0 dBr +/- 1.5 dB
7 kHz +3.8 dBr +/- 1.5 dB
14 kHz -3.9 dBr +/- 1.5 dB
46
Test Procedures
Note: The following tests will check the
performance of the Power Supply / Amplifier
PCB assembly
7. Channel 1 Line Array Amplifier
THD+N Test
7.1 Set the channel 1 volume, bass and
treble tone controls to the 12 o’clock setting
(straight up).
7.2 Connect a 4 Ohm, 50 Watt load resistor
to the line array output.
7.3 Apply a balanced 1kHZ, -50dBV
(3.16mVrms) sine wave to the channel 1
microphone XLR input jack.
7.4 Measure the THD+N level. It should be
< 1%.
8. Power Amplifier Gain and THD+N Test
Note: During these high power tests, take
care to not operate the amplifer for a long
period of time to avoid overheating the
amplifier output IC.
8.1 Set the channel 2 ToneMatch switch to
OFF.
8.2 Set the channel 2 volume control to the
12 o’clock setting.
8.3 Verify that the AC line cord is not con-
nected to the unit under test. On the back of
the power stand, remove the 6 screws that
secure the rear cover. Lift off the cover.
Remove the 4 screws that secure the power
supply / power amplifier PCB to the power
stand. Slide the PCB down and out of the
power stand so that the component side of
the board is facing upward.
8.5 Connect a 4 Ohm, 50 Watt load resistor
to pins 1 and 2 of the bass amplifier output
connector CN2. These connectors are
located near the bottom of the PCB assembly.
8.6 Re-connect the AC line cord and turn on
the power stand at the AC power switch.
8.7 Apply a balanced 1kHZ, 0dBV (1Vrms)
sine wave to the channel 2 balanced 1/4”
input jack.
8.8 Reference a dB meter to the input level.
Measure the output gain level at the line
array’s 4 ohm load resistor. It should be
+28.4dBr minimum.
8.9 Measure the THD+N level. It should be
< 1%.
8.10 Apply a balanced 100 Hz, 0dBV (1Vrms)
sine wave to the channel 2 balanced 1/4”
input jack.
8.11 Reference a dB meter to the input level.
Measure the output gain level at the
woofers’s 4 ohm load resistor. It should be
+28.4dBr minimum.
8.12 Measure the THD+N level. It should be
< 1%.
8.13 Re-install the power supply / power
amplifier PCB assembly into the power
stand. Replace the rear cover. Perform the
system sweep test below to ensure there
are no air leaks in the power stand.
9. System Sweep Test
9.1 Set up the system in the collapsed
position.
8.4 Connect a 4 Ohm, 50 Watt load resistor
to pins 1 and 2 the high frequencey array
output connector CN1.
9.2 Set the channel 2 ToneMatch switch to
the OFF position (down). Set the channel 2
volume control to maximum.
9.3 Apply a 50 Hz, -34dBV (20mVrms) sine
wave to both of the channel 2 RCA input
jacks.
47
Test Procedures
9.4 Sweep the audio signal generator from
50Hz to 15kHz. Sweep duration should be
about 3 seconds up and 3 seconds down.
9.5 Listen carefully for buzzes, rattles, or
other extraneous noises from the array
drivers or woofer or from the internal parts.
Verify that there are no air leaks from the
power stand cabinet. The whooshing noise
from the port around 65Hz is acceptable.
Note: If you have the customer’s array
extensions with the system, set up the
system in the extended position instead of
the collapsed position and perform steps 9.2
to 9.5.
L1 Compact Line Array Tests
Set up the unit under test as shown below.
Audio Signal
Generator
Power Amplifier
INPUTOUTPUT
L1 Compact
Line Array
Line Array Test Cable
2.2 Connect a signal generator directly to the
terminals of the transducer assembly under
test.
2.3 Apply a 65Hz, 1Vrms sine wave to the
transducer assembly.
2.4 Listen carefully for any extraneous
noises such as rubbing, scraping or ticking.
Note: To distinguish between normal sus-
pension noise and rubs or ticks, displace
the cone slightly with your fingers. If the
noise stays the same, it is normal suspension noise and the driver is good. Suspension noise will not be heard with program
material.
3. Transducer Phase Test
3.1 Momentarily apply a DC voltage of 5V,
positive applied to the positive tab of the dual
banana jack on the line array test cable and
negative applied to negative (gnd) tab.
3.2 All of the driver cones should move
outward when the DC voltage is applied.
3.3 Rewire any incorrectly connected trans-
ducers.
1. Air Leak Test
1.1 Apply a 65Hz, 1Vrms sine wave to the
unit under test.
1.2 Listen carefully for air leaks from around
the end cap, the transducers and the grille.
Air leaks will be heard as a hissing or sputtering sound. All repairs must be hidden. Test
duration should be 5 seconds minimum.
2. Transducer Rub and Tick Test
2.1 Remove the transducer you wish to test
using the disassembly procedures in this
manual.
4. Line Array Sweep Test
4.1 Set up the upper or lower line array
section as shown in the figure on the previous page.
4.2 Apply a 100 Hz, 10Vrms sine wave to the
amplifier input.
4.3 While listening to the output of the sys-
tem, sweep the input frequency slowly from
100 Hz to 15 kHz.
4.4 Listen carefully for any extraneous
noises such as buzzing and ticking.
48
V
IC Diagrams
Y Package (TO-220-7C)
Note: Y package for TOP254-258
Tab Internally
Connected to
SOURCE Pin
Pin Con guration (Top View).
V
7D5F4S3C2X1
CONTROL (C)
Z
C
EXTERNAL
CURRENT
LIMIT (X)
VOLTAGE
MONITOR (V)
FREQUENCY
(F)
Functional Block Diagram (TOP254-258 YN Package)
Pin Functional Description
DRAIN (D) Pin:
High-voltage power MOSFET DRAIN pin. The internal start-up
bias current is drawn from this pin through a switched highvoltage current source. Internal current limit sense point for
drain current.
CONTROL (C) Pin:
Error ampli er and feedback current input pin for duty cycle
control. Internal shunt regulator connection to provide internal
bias current during normal operation. It is also used as the
connection point for the supply bypass and auto-restart/
compensation capacitor.
EXTERNAL CURRENT LIMIT (X) Pin ( Y, M, E and L package):
Input pin for external current limit adjustment and remote
ON/OFF. A connection to SOURCE pin disables all functions
on this pin.
SHUNT REGULATOR/
ERROR AMPLIFIER
I
FB
CURRENT
LIMIT
ADJUST
LINE
SENSE
C
+
-
STOP
OSCILLATOR
WITH JITTER
F REDUCTION
F REDUCTION
PWM
START
SOFT START
SOFT
D
MAX
CLOCK
OFF
5.8 V
-
4.8 V
5.8 V
+
+ V
V
BG
1 V
INTERNAL UV
COMPARATOR
V
I (LIMIT)
ON/OFF
T
STOP LOGIC
OV/UVOVP V
DC
DC
MAX
MAX
66k/132k
SOFT START
I
FB
K
I
PS(UPPER)
PS(UPPER)
K
I
PS(LOWER)
PS(LOWER)
÷ 16
SHUTDOWN/
AUTO-RESTART
HYSTERETIC
THERMAL
SHUTDOWN
0
INTERNAL
SUPPLY
1
K
PS(UPPER)
K
PS(LOWER)
CURRENT LIMIT
COMPARATOR
CONTROLLED
TURN-ON
GATE DRIVER
SRQ
VOLTAGE MONITOR (V) Pin (Y & M package only):
Input for OV, UV, line feed forward with DC
overvoltage protection (OVP), remote ON/OFF and device reset.
MAX
A connection to the SOURCE pin disables all functions on this pin.
FREQUENCY (F) Pin (TOP254-258Y, and all E and L packages):
Input pin for selecting switching frequency 132 kHz if connected
to SOURCE pin and 66 kHz if connected to CONTROL pin.
The switching frequency is internally set for xed 66 kHz
operation in the P, G, M package and TOP259YN, TOP260YN
and TOP261YN.
SIGNAL GROUND (G) Pin ( TOP259YN, TOP260YN &
TOP261YN only):
Return for C pin capacitor and X pin resistor.
SOURCE (S) Pin:
Output MOSFET source connection for high voltage power
return. Primar y side control circuit common and reference point.