User Guide
Audio Converter
BUC 202
Two Channel Balanced and
Unbalanced Audio Converter
68-2351-01
Rev. A
03 14
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FCC Class B notice
This equipment has been tested and found to comply with the limits for a Class B digital
device, pursuant to part 15 of the FCC rules. These limits provide reasonable protection
against harmful interference in a residential installation. This equipment generates, uses, and can
radiate radio frequency energy and, if not installed and used in accordance with the instructions,
may cause harmful interference to radio communications. There is no guarantee that interference will
not occur. If this equipment does cause interference to radio or television reception, which can be
determined by turning the equipment off and on, you are encouraged to try to correct the interference
by one or more of the following measures:
•
•
•
Reorient or relocate the receiving antenna.
Increase the separation between the equipment and receiver.
Connect the equipment into an outlet on a circuit different from that to which the receiver is
connected.
•
Consult the dealer or an experienced radio/TV technician for help.
nOTE: For more information on safety guidelines, regulatory compliances, EMI/EMF compatibility,
Guide” on the Extron website.
Conventions used in this guide
notifications
The following notifications are used in this guide:
CauTIOn: A caution indicates a situation that may result in minor injury.
warnIng: A warning indicates a situation that has the potential to result in death or
severe injury.
aTTEnTIOn: Attention indicates a situation that may damage or destroy the product or
associated equipment.
Specifications availability
copyright
© 2014 Extron Electronics. All rights reserved.
Trademarks
All trademarks mentioned in this guide are the properties of their respective owners.
The following registered trademarks®, registered service marks(Sm), and trademarks(Tm) are the property of
rGB Systems, Inc. or Extron Electronics:
registered Trademarks(®)
AVTrac, Cable Cubby, CrossPoint, eBUS, EDID Manager, EDID Minder, Extron, Flat Field, GlobalViewer, Hideaway, Inline, IP Intercom, IP Link,
Key Minder, LockIt, MediaLink, PlenumVault, PoleVault, PowerCage, PURE3, Quantum, SoundField, SpeedMount, SpeedSwitch,
System INTEGRATOR, TeamWork, TouchLink, V-Lock, VersaTools, VN-Matrix, VoiceLift, WallVault, WindoWall, XTP, and XTP Systems
registered Service mark(Sm) : S3 Service Support Solutions
Trademarks(™)
AAP, AFL (Accu-Rate Frame Lock), ADSP (Advanced Digital Sync Processing), Auto-Image, CDRS (Class D Ripple Suppression), DDSP (Digital
Display Sync Processing), DMI (Dynamic Motion Interpolation), Driver Configurator, DSP Configurator, DSVP (Digital Sync Validation Processing),
FastBite, FOXBOX, IP Intercom HelpDesk, MAAP, MicroDigital, ProDSP, QS-FPC (QuickSwitch Front Panel Controller), Scope-Trigger, SIS,
Simple Instruction Set, Skew-Free, SpeedNav, Triple-Action Switching, XTRA, ZipCaddy, ZipClip
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Contents
Introduction ....................................................1
Features ............................................................. 1
Application Example........................................... 2
Setup and Operation ......................................3
Rear Panel Features and Cabling........................ 3
Front Panel Feature ............................................ 5
Adjusting the Trim............................................... 5
Mounting.........................................................6
UL Rack Mounting Guidelines............................. 6
Tabletop Mounting.............................................. 6
Rack Rail and Under-Furniture Mounting ............ 6
Rack Rail Mounting......................................... 7
Under-Furniture Mounting............................... 8
Rack Shelf Mounting ........................................ 10
BUC 202 User Guide • Contents
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Introduction
The Extron BUC 202 is a two channel balanced and unbalanced audio converter and audio
line driver. It features two balanced or unbalanced inputs and outputs, both on captive
screw connectors. The BUC 202 provides two independent channels of signal matching
between unbalanced and balanced audio equipment. Two rotary switches provide precise
trim adjustment from -21 to +21 dB in clearly-labeled 3 dB steps. In addition to serving as
an interface from consumer products to professional AV systems, the BUC 202 is a high-
quality line driver for sending and receiving audio signals up to 1,000 feet (300 m). The
unique 1U, quarter rack width enclosure, together with the included patented ZipClip 200
mounting bracket, offers the versatility to install the BUC 202 in a discreet location, such as
on a rack rail, beneath a table, or within a lectern.
Features
•
Converts unbalanced audio signals to balanced signals and balanced signals to
unbalanced signals
•
•
•
•
Active balancing circuitry
Audio line driver for long distance audio signal transmission
Independent, variable trim control on each channel with wide, 42 dB adjustment range
Versatile 1U, quarter rack width enclosure allows installation on a rack rail, beneath a
table, or within a lectern
•
Patented ZipClip 200 mounting kit included:
•
Mounts securely on a variety of surfaces, including rack rails, tables, lecterns,
and table legs
•
•
Wire tie slots for proper strain relief and dressing of excess cable
Quick release tab allows for easy installation and removal
BUC 202 User Guide • Introduction
1
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Application Example
The illustration below is one example of configuring a system using the BUC 202.
Extron
BUC 202
Two Channel
Audio BUC
2
BUC 20
S
2
OUTPUT
1
TS
2
U
P
IN
1
2
0
TRIM
-6
3
6
9
60Hz
-
50
-3
2
1
15
18
X
1
0
MA
-9
0V
3
6
0.2A
9
2
-3
-6
-9
-1
1
2
100-24
12
15
5
-1
-1
8
-2
1
Extron
2
18
21
-1
15
-
8
-2
1
-1
STP20-2 Cable
Serial Control/Audio Cable
PC
)
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Extron
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Combo Power Ampliꢀer
Extron
SI 26CT
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Extron
SI 28
Surface-Mount
Speakers
Figure 1. BUC 202 Application Example
BUC 202 User Guide • Introduction
2
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Setup and Operation
The Setup and Operation section describes:
•
•
•
Rear Panel Features and Cabling
100-240V 50/60 Hz
0.2A MAX
BUC 202
OUTPUTS
INPUTS
1
TRIM
1
2
2
2
1
0
0
-3
-6
3
-3
-6
3
6
6
-9
9
-9
9
-12
-15
-12
-15
12
12
15
15
-18
-18
18
18
-21
-21
21
21
A
B
D
C
AC power
Input connector
A
B
C
Trim adjustment
Output connector
D
Figure 2. BUC 202 Rear Panel
AC power — Connect to standard AC power: 100 to 240 VAC, at 50 or 60 Hz.
A
B
Trim adjustment (channels 1 and 2) — Adjust the audio input level for the channel
using the 16-position rotary switch. This switch sets the level in 3 dB increments from
-21 dB to +21 dB. The arrow on the shaft indicates the current setting.
TRIM
2
1
0
0
-3
-6
3
-3
-6
3
6
6
9
-9
9
-9
-12
-15
-12
-15
12
12
15
15
-18
-18
18
18
-21
-21
21
21
Figure 3.
BUC 202 16-position Rotary Switches
NOTE: Unity gain (0 dB) for both channels is at the 12 o’clock (vertical) position
with the arrow on the shaft pointing to the 0 position. When the switch is set to the
on page 5).
BUC 202 User Guide • Setup and Operation
3
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Input connector — This 3.5 mm, 5-pole captive screw connector accepts line level
balanced or unbalanced, mono or stereo audio signals (see to the illustrations below for
proper wiring).
C
ATTENTION: The length of the exposed wires in the stripping process is critical.
The ideal length is 3/16 inches (5 mm). Any longer and the exposed wires may
touch, causing a short circuit between them. Any shorter and the wires can be
easily pulled out even if tightly fastened by the captive screws.
NOTE: Do not tin the wires. Tinned wires are not as secure in the connector and
could be pulled out.
Tip
Ring
Tip
Sleeves
Tip
Ring
Sleeve
Ring
Balanced Stereo Input
Balanced Dual Mono Input
Do not tin the wires!
Tip
Sleeve
Tip
Tip
Sleeve
Sleeve
Unbalanced Stereo Input
Unbalanced Dual Mono Input
Figure 4.
Audio Input Connectors
Output connector — The 3.5 mm, 5-pole captive screw connector outputs balanced
or unbalanced line level audio (see the illustrations below for proper wiring).
D
ATTENTION: For unbalanced audio output, connect sleeves to the center ground
pin. DO NOT connect sleeves to the negative (–) contacts.
NOTE: Do not tin the wires. Tinned wires are not as secure in the connector and
could be pulled out.
No Ground Here
Tip
Ring
Sleeves
Tip
Tip
Sleeves
Tip
Ring
No Ground Here
Do not tin the wires!
Balanced Audio Output
Unbalanced Audio Output
Tip-ring-sleeve and tip-sleeve connections:
Tip (L)
Ring (R)
Tip (+)
Sleeve (
)
Sleeve (
)
Tip-Ring-Sleeve
Tip-Sleeve
Figure 5.
Audio Output Connectors
BUC 202 User Guide • Setup and Operation
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Front Panel Feature
BUC 202
Figure 6. BUC 202 Front Panel
Power LED — The green lights when the BUC 202 is receiving power.
A
Adjusting the Trim
The BUC 202 can be wired in four different configurations:
•
•
•
•
Balanced input to unbalanced output
Unbalanced input to balanced output
Balanced input to balanced output
Unbalanced input to unbalanced output
Follow the steps below to adjust the trim:
1. Disconnect power from all devices.
2. Wire the BUC 202 for either balanced or unbalanced stereo or dual mono audio input.
3. Wire the BUC 202 for either balanced or unbalanced audio output.
4. Set the trim adjustment:
a. Determine the input and output signal types (balanced or unbalanced) and whether
it is consumer or professional audio.
Find the trim adjusment setting according to the table below.
Balanced
Unbalanced
Output
Consumer1
Consumer1
Professional2
Professional2
Input
Consumer1
Professional2
Consumer1
0 dB
-12 dB
0 dB
12 dB
6 dB
18 dB
Balanced
Unbalanced
NOTES:
-6 dB
0 dB
6 dB
6 dB
12 dB
18 dB
Professional2
-12 dB
-6 dB
0 dB
6 dB
1 Consumer line level is -10 dBV ≈ -8 dBu.
2 Professional line level is +4 dBu.
b. Use a small screwdriver to turn the appropriate trim adjustment switch to the
desired setting.
5. Reconnect power to all devices to test the audio.
6. If necessary, readjust the trim.
BUC 202 User Guide • Setup and Operation
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Mounting
The Mounting section describes:
•
•
•
•
UL Rack Mounting Guidelines
The following Underwriters Laboratories (UL) guidelines pertain to the safe installation of the
BUC 202 in a rack.
1. Elevated operating ambient temperature — If installed in a closed or multi-unit rack
assembly, the operating ambient temperature of the rack environment may be greater
than room ambient temperature. Therefore, install the BUC 202 in an environment
compatible with the maximum ambient temperature (Tma = +122 °F, +50 °C) specified
by Extron.
2. Reduced air flow — Install the equipment in a rack so that the amount of air flow
required for safe operation of the equipment is not compromised.
3. Mechanical loading — Mount the equipment in the rack so that a hazardous
condition is not achieved due to uneven mechanical loading.
4. Circuit overloading — Connect the equipment to the supply circuit and consider the
effect that circuit overloading might have on overcurrent protection and supply wiring.
Appropriate consideration of equipment nameplate ratings should be used when
addressing this concern.
5. Reliable earthing (grounding) — Maintain reliable grounding of rack-mounted
equipment. Pay particular attention to supply connections other than direct connections
to the branch circuit (as an example, use of power strips).
Tabletop Mounting
To mount the unit on a desk or tabletop, set the unit on a tabletop.
Rack Rail and Under-Furniture Mounting
NOTE: To properly mount the BUC 202 on a rack rail or under furniture use the Extron
ZipClip 200 Mounting Clip.
BUC 202 User Guide • Mounting
6
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Rack Rail Mounting
2
C
B
ZipClip 200
B
U
C
2
0 2
Side of Rack
02
2
C
S
UT
BU
2
P
UT
O
1
S
UT
2
NP
I
1
M
2
I
TR
M
3
5
6
9
0
2
12
15
18
TRI
-3
6
-
-
z
9
1
H
2
0
1
0
6
9
-1
3
8
21
-
/6
2
-1
15
1
-
1
50
X
MA
3
-
6
-
8
1
V
A
2
-9
21
40
2
.
12
-
-
-
0
1
-2
0
15
-1
8
10
Back of
Rack
Inside of Rack
Figure 7. BUC 202 Rack Rail Mounting
1. Fasten the ZipClip 200 mounting clip to a convenient location on a rack rail using two
rack screws.
2. Insert the bottom of the BUC 202 into the clip, starting with one end.
3. Pivot the other end of the unit toward the clip and press until the BUC 202 snaps into
place.
4. To secure any loose cables and to provide strain relief, attach tie wraps (“zip ties”)
around the tie wrap notches on the BUC 202 and through the anchor points on the
mounting clip.
1
0
0
4
.2
0
V
A
0
A
/6
X
M
0
z
T
R
1
I
M
-6-3
0
-9
-1
3
2
6
9
-1
2
5
I
N
1
-1
-6
-3
8
0
P
U
1
2
-
9
B
-2
-
3
T
S
1
1
5
1
2
U
6
C
2
1
1
8
-
1
5
20
9
-1
8
2
12
15
O
2
-2
U
1
T
P
2118
U
T
1
S
2
Tie Wrap
ATTENTION: Connect and pull the tie wraps until they are secure.
Do not overtighten.
BUC 202 User Guide • Mounting
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5. To remove the BUC 202 from the ZipClip 200 mounting clip, press down on the locking
tab ( ) while lifting up on the unit ( ).
1
2
2
BUC
2
02
1
Under-Furniture Mounting
1
ZipClip 200
2
1
-
1
8
-
1
5
-
1
1
2
8
1
9
-
2
1
-
5
1
8
-
-
1
1
2
6
2
5
1
-
0
1
0
1
2
9
8
6
0
1
0
-
3
0
V
2
4
-
9
0
1
5
2
6
-
6
/
0
1
9
-
6
3
2
H
T
z
R
I
M
1
2
N
I
P
U
T
S
1
O
U
2
T
P
U
T
S
B U
C
2
0
2
Furniture Mounted
BUC 202
Figure 8. BUC 202 Under-Furniture Mounting
NOTE: The ZipClip is shipped with a set of four wood screws.
1. Attach the ZipClip to the furniture using two or more wood screws ( ). Make sure the
1
clip is oriented with the appropriate side facing the mounting surface and with the tab
accessible from the front of the furniture.
2. Insert the bottom of the BUC 202 into the clip, starting with one end ( ).
2
3. Pivot the other end of the unit toward the clip and press until the BUC 202 snaps into
place.
BUC 202 User Guide • Mounting
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4. To secure any loose cables and to provide strain relief, attach tie wraps (“zip ties”)
around the tie wrap notches on the BUC 202 and through the anchor points on the
mounting clip.
1
0
0
4
.2
0
V
A
0
A
/6
X
M
z
T
R
1
I
M
-6-3
0
-9
-1
3
2
6
9
-1
2
5
I
N
1
-1
-6
-3
8
0
P
U
1
2
-
9
B
-2
-
3
T
S
1
1
5
1
2
U
6
C
2
1
8
-
1
1
5
20
9
-1
8
2
12
15
O
2
-2
U
1
T
P
2118
U
T
1
S
2
Tie Wrap
ATTENTION: Connect and pull the tie wraps until they are secure.
Do not overtighten.
5. To remove the BUC 202 from the ZipClip 200 mounting clip, press down on the locking
tab ( ) while lifting up on the unit ( ).
1
2
2
BUC 20
2
1
BUC 202 User Guide • Mounting
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Rack Shelf Mounting
2
RSB 123
Rack Shelf
BUC
2
0
2
1
(2) 4-40 x 3/16"
Screws
Rack Mounted
Figure 9. BUC 202 Rack Shelf Mounting
1. Align the threaded holes in the bottom of the BUC 202 with the holes in an Extron rack
shelf ( ). Fasten the unit to the shelf with two 4-40 x 3/16-inch screws.
1
2. Bolt the rack shelf to the rack ( ).
2
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Extron Warranty
Extron Electronics warrants this product against defects in materials and workmanship for a period of three years
from the date of purchase. In the event of malfunction during the warranty period attributable directly to faulty
workmanship and/or materials, Extron Electronics will, at its option, repair or replace said products or components,
to whatever extent it shall deem necessary to restore said product to proper operating condition, provided that it is
returned within the warranty period, with proof of purchase and description of malfunction to:
USA, Canada, South America,
and Central America:
Extron Electronics
1230 South Lewis Street
Anaheim, CA 92805
U.S.A.
Japan:
Extron Electronics, Japan
Kyodo Building, 16 Ichibancho
Chiyoda-ku, Tokyo 102-0082
Japan
Europe and Africa:
Extron Europe
Hanzeboulevard 10
3825 PH Amersfoort
The Netherlands
China:
Extron China
686 Ronghua Road
Songjiang District
Shanghai 201611
China
Asia:
Middle East:
Extron Asia Pte Ltd
135 Joo Seng Road, #04-01
PM Industrial Bldg.
Singapore 368363
Singapore
Extron Middle East
Dubai Airport Free Zone
F12, PO Box 293666
United Arab Emirates, Dubai
This Limited Warranty does not apply if the fault has been caused by misuse, improper handling care, electrical
or mechanical abuse, abnormal operating conditions, or if modifications were made to the product that were not
authorized by Extron.
NOTE: If a product is defective, please call Extron and ask for an Application Engineer to receive an RA (Return
Authorization) number. This will begin the repair process.
USA:
Asia:
714.491.1500 or 800.633.9876
65.6383.4400
Europe:
Japan:
31.33.453.4040
81.3.3511.7655
Units must be returned insured, with shipping charges prepaid. If not insured, you assume the risk of loss or damage
during shipment. Returned units must include the serial number and a description of the problem, as well as the
name of the person to contact in case there are any questions.
Extron Electronics makes no further warranties either expressed or implied with respect to the product and its quality,
performance, merchantability, or fitness for any particular use. In no event will Extron Electronics be liable for direct,
indirect, or consequential damages resulting from any defect in this product even if Extron Electronics has been
advised of such damage.
Please note that laws vary from state to state and country to country, and that some provisions of this warranty may
not apply to you.
Extron Asia
Extron India
Extron Headquarters
Extron Europe
Extron Japan
Extron China
Extron Middle East
Extron Korea
+65.6383.4400
+65.6383.4664 FAX
1.800.3070.3777
(Inside India Only)
+1.800.633.9876 (Inside USA/Canada Only)
+800.3987.6673
(Inside Europe Only)
+81.3.3511.7655
+81.3.3511.7656 FAX
+86.21.3760.1568
+86.21.3760.1566 FAX
+971.4.299.1800
+971.4.299.1880 FAX
+82.2.3444.1571
+82.2.3444.1575 FAX
Extron USA - West
+1.714.491.1500
Extron USA - East
+1.919.850.1000
+91.80.3055.3777
+31.33.453.4040
+91.80.3055.3737 FAX
+1.714.491.1517 FAX
+1.919.850.1001 FAX
+31.33.453.4050 FAX
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