Extron Electronics BUC 202 Setup Guide

IMPO RTANT:

TRIM

Tip (L)

Tip-Ring-SleeveTip-Sleeve

Go to www.extron.com for the complete

user guide, installation instructions, and

BUC 202 • Setup Guide

specifications before connecting the

product to the power source.

This guide provides instructions for an experienced installer to set up and operate the Extron
BUC 202 two channel unbalanced/balanced audio converter and line driver.

Rear Panel Features and Cabling

100-240V 50/60 Hz

0.2A MAX

TRIM

1

0

-3

3

-6

6

-6

-9

9

-9

-12

-12

12

-15

-15

15

-18

-18

18

-21

-21

21

A

AC power — Connect to standard AC power: 100 to 240 VAC, at 50 or 60 Hz.

A

Trim adjustment (channels 1 and 2) — Adjust the audio input level for the channel using

B

B

INPUTS

1

2

0

-3

3

6

9
12
15

18

21

C

2

BUC 202

OUTPUTS

1

D

2

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.

1

0

-3

-6

-9

-12

-15

-18

-21

Input connector — This 3.5 mm 5-pole captive screw connector accepts line level

C

-3

3

-6

6

-9

9

-12

12

-15

15

-18

18

-21

21

NOTE: Unity gain (0 dB) for both channels is at the 12 o’clock

2

0

3

6

18

21

(vertical) position with the arrow on the shaft pointing to the 0
position. When the switch is set to the bottom position (indicated

9
12

by a dot) the signal is muted (see Adjusting the Trim).

15

balanced or unbalanced, mono or stereo audio signals (see the illustrations below for
proper wiring).

Do not tin the wires!

Tip

Ring

Sleeves

Tip

Ring

Balanced Stereo Input

Tip

Sleeve

Tip

Sleeve

12

Tip

Ring

Sleeve

Balanced Dual Mono Input

12

Tip

Sleeve

(high impedance)

12

12

Unbalanced Stereo Input

Tip-ring-sleeve and tip-sleeve connections:

Ring (R)

Sleeve ( )

Unbalanced Dual Mono Input

Tip (+)

Sleeve ( )

BUC 202 • Setup Guide (Continued)

No Ground Here

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.

Output connector — The 3.5 mm 5-pole captive screw connector outputs balanced or

D

unbalanced audio signals (see the illustrations below for proper wiring).

ATTENTION: For unbalanced audio output, connect sleeves to the center ground

pin. DO NOT connect sleeves to the negative (–) contacts. This would create a short
and possibly damage the unit.

NOTE: Do not tin the wires. Tinned wires are not as secure in the connector and

could be pulled out.

Do not tin the wires!

Tip

Ring

Sleeves

Tip

Ring

Balanced Audio Output

12

Tip

Sleeves

Tip

No Ground Here

Unbalanced Audio Output

12

Front Panel

The green power LED on the front panel lights when the BUC 202 is receiving power.

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.