David Clark XL-9V Instructions

Battery module

The model XL-9V battery pack uses a 9 volt alkaline battery (NEDA #1604A) to provide power

to the headset ENC system. The XL-9V features an Auto Shut Off function to save the battery if

the power switch is left on when the headset is not in use. The Auto Shut Off feature operates

by sensing loss of microphone DC bias voltage when the headset is unplugged or aircraft audio

system is shut off.

A switch is provided inside the battery compartment (see Fig. 1) to control the Auto Shut Off

feature. The XL-9V is shipped from the factory with this switch in the DISABLE position,

which will provide continuous power to the ENC system whenever the power switch is on.

Note: Switch must be in the DISABLE position when XL-9V is used

with H10-76XL or any headset using a non-amplified microphone.

The ENABLE position provides automatic shut off of power to the ENC system if the headset is

unplugged or the aircraft audio system power is turned off.

To operate the Auto Shut Off switch remove the battery, and using a small pointed tool gently

move the switch to the desired position. A blunt tool like a ballpoint pen is not recommended.

Replace battery.

A bi-color LED, mounted on the top of the battery pack indicates the status of the battery

(see Fig. 2).

When the battery is good and the headset is powered, the LED will blink green approximately

once per second. When the battery is low, the LED will be red until the battery is fully discharged.

19528P-85 (11-02)

XL-9V BATTERY MODULE INSTRUCTIONS

Fig. 1

View into the battery compartment,

showing Auto Shut Off Switch

Fig. 2

View of the top of the battery

module, showing LED

Table of Contents

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Page 1 The model XL-9V battery pack uses a 9 volt alkaline battery (NEDA #1604A) to provide power to the headset ENC system. The XL-9V features an Auto Shut Off function to save the battery if the power switch is left on when the headset is not in use. The Auto Shut Off feature operates by sensing loss of microphone DC bias voltage when the headset is unplugged or aircraft audio system is shut off.
Page 2 Battery Insertion and Removal CAUTION: Improper battery insertion may damage unit. To remove the battery compartment cover, press down on the recess and slide the cover back. To install the battery compartment cover, align with the recess in the battery compartment and slide the cover forward until it snaps into position (See Fig.