Shure SCM268 User Manual

Shure Incorporated
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Internal Modifications
Internal Modifications
Voltages in this equipment are hazardous to life. No userserviceable parts inside. Refer all servicing and modifications to qual
ified service personnel.
Disassembly
To access the printed circuit board (pc board) for internal modifications, use the following steps:
Unplug the power cord.
Remove the knobs and retainer nuts from the front panel (See figure 2).
FIGURE 2
Remove the four screws at each corner of the back panel.
Remove the two screws at each bottom corner of the front panel.
Slide the back panel and pc board out from the rear of the chassis.
When reassembling the SCM268, DO NOT OVERTIGHTEN the knob retainer nuts. Use a minimal amount of force to
secure the nut (0.6-0.8 N m (5-7 in lb)). Damage to the internal components will result if too much force is used.
Low-Cut Filter
To bypass the built-in low-cut filter for a given channel, remove the specified resistor and place a 10µF to 33µF capacitor in the
specified pc board location (polarity does not matter). Refer to the following table:

Shure SCM268 Specifications

General

Frequency range	20 - 20000 Hz
Channels quantity	4 channels
Digital sound processing	- bit
Microphone input impedance	1.2 Ω
Output impedance	870 Ω
Total Harmonic Distortion (THD)	0.25 %
DJ mixer	-
Product color	Black
Video capability	No
AC input voltage	220 - 240 V
Power consumption	30 mA
AC input frequency	50 / 60 Hz
AUX in	Yes
AUX out ports	1
Number of microphone inputs	4