Shure Switch A120S User Manual

A120S In-Line Switch User Guide  
THICKER OR MULTIPLE SINGLE NARROWER  
CABLES  
CABLE  
GENERAL  
The A120S Accessory in-Line Switch can be used to  
FLEX RELIEF  
FIGURE 1  
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.  
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.  
OPERATION  
Switch Function  
Rotary Knob Position  
On/Off (Button remains down  
until depressed a second time)  
Push-To-Talk (Button remains  
down only while depressed)  
Locking  
Momentary  
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  
KNOTTED STRAIN RELIEF  
FOR OTHER CABLES  
STRAIN RELIEF FOR ONE  
6.4 mm (0.25 in.) CABLE  
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.  
FIGURE 2  
2002, Shure Incorporated  
27B8064 (BI)  
Printed in U.S.A.  
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