A120S In-Line Switch User Guide, General

A120S In-Line Switch User Guide

GENERAL

The A120S Accessory in-Line Switch can be used to add an On/OFF, Push-To-Talk, Cough Button, or Transmit- ter-Relay Keying function to a microphone or other device rated at up to 3 amps ac (0.5 Adc) 125V, non-inductive load. The switch has gold-plated contacts for reliable perfor- mance even in low-current circuits. The switch is a double- pole double-throw type for maximum versatility. Its pushbut- ton combines with a rotary knob to provide either spring-return momentary or locking action.

The unit is supplied with a crimp-on strain relief tor 6.4mm (0.25-in.) diameter cable and with a flex relief for ei- ther large or small diameter cables. The permanently at- tached belt clip can be rotated on the case to any of four posi- tions for the most convenience in use.

OPERATION

	Switch Function	Rotary Knob Position

	On/Off (Button remains down	Locking
	until depressed a second time)
	Push-To-Talk (Button remains	Momentary
	down only while depressed)	Momentary
	down only while depressed)

Locking the Switch Button Down

The switch button can be locked down by following these steps.

1.Turn the rotary knob to locking.

2.Press the switch button down.

3.Turn the knob to Momentary.

The button will remain locked down until the knob is re- turned to locking and the button is depressed again.

SWITCH INSTALLATION AND WIRING

1.For thicker cable (e.g., one 6.4 mm [0.25 in.] diameter cable or two 3.8 mm [0.15 in.] diameter cables), cut off the bottom of the flex relief at the rib. For narrower cable (e.g., one 2.3 mm [0.39 in.] diameter cable), use the en- tire flex relief as supplied. Thread the cable (s) through the flex relief.

THICKER OR MULTIPLE SINGLE NARROWER

CABLESCABLE

FLEX RELIEF

FIGURE 1

2.For one 6.4 mm diameter cable (0.25 in.), crimp the strain relief to the cable making sure the eyelet is to- ward the raw end of the cable. Leave enough raw cable above the strain relief to permit soldering the individual conductors to the switch terminals.

NOTE: For all other cables, loosely knot the cable above the flex relief to form a strain relief. Leave enough raw cable above the knot to permit soldering the individual conductors to the switch terminals.

STRAIN RELIEF FOR ONE KNOTTED STRAIN RELIEF

6.4 mm (0.25 in.) CABLE

FOR OTHER CABLES

FIGURE 2

2002, Shure Incorporated

27B8064 (BI)

Printed in U.S.A.