2 installation, 1 welcome, Mt-xlr – Crown Audio MT-XLR User Manual

Page 2

MT–XLR

Reference Manual

FROM

SOURCE

INPUT

–
+

GND

Fig. 1.1 MT-XLR

MT-XLR

C H - 2 I N P U T

C H - 1 I N P U T

PUSH

GND

THESE XLR INPUTS ARE CONNECTED IN PARALLEL WITH THE PHONE JACK INPUTS.

2 Installation

CAUTION: This input accessory
panel should only be installed by
qualified service personnel in the
following manner:

1. Turn down the level controls

(fullly counterclockwise), turn off
the amplifier and unplug it from
the AC power source.

2. Remove the filter/grill from the

front panel (3 Phillips screws).
Remove the cover plate from the

back panel (2 Phillips screws).

3. Lay the amplifier upside down

and remove the bottom cover
(8 Phillips screws).

4. Locate the main board (Figure

2.1) and remove the two Phillips
screws which secure it to the
chassis. Remove the nuts which
secure the input phone jacks to
the rear panel. Slide the main
board toward the front until the

FRONT

BOTTOM VIEW

MAIN BOARD

REMOVE SCREW

Fig. 2.1 Inside a Micro-Tech

1 Welcome

The MT-XLR accessory panel is
designed to give your Micro-Tech

Power Base

, Power-Tech

™

and

CSL

amplifiers the same bal-

anced XLR inputs which are stan-
dard for a Macro-Tech

amplifier.

Installation requires access to the
top side of the main circuit board
and should only be attempted by
a qualified technician.

The female XLR connectors are
wired with the following pin assign-
ments:

Pin 1 Signal Ground

Pin 2 Positive (+) Input (non-in-

verting)

Pin 3 Negative (–) Input (invert-

ing)

Balanced and unbalanced input
wiring is shown in Figures 1.2 and
1.3. Notice that a jumper should

Fig. 1.3 Unbalanced

Input Wiring

Fig. 1.2 Balanced

Input Wiring

FROM

SOURCE

INPUT

SHIELD

WARNING: TO PREVENT

ELECTRIC SHOCK, THIS

ACCESSORY SHOULD

ONLY BE INSTALLED BY

QUALIFIED SERVICE

PERSONNEL.

be installed between pins 1 and
3 when connecting an unbal-
anced source.

Page 2

Page 3