LG H20J55DT Owner's Manual - Page 15

Pillow Speaker Setup

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Pillow Speaker Setup Connect a pillow speaker to the TV Pillow Speaker Control Pillow Speaker Interface This connector furnishes three control lines and an audio output. A patient-pendant remote control, or entertainment audio and nurse call system may be connected here. All lines are isolated from the AC power line and earth ground. (Opto-isolators isolate the control lines, and a transformer isolates the audio. There are no relays or inductive components in the control lines.) 4 5 6 1 2 1 2 3 4 5 6 Pin No. 1 Purpose External TV On/Off switch. 3 2 (Not used.) 3 TV ON/OFF 4 OPEN CHAN UP/DATA IN COMMON 5 AUDIO OUT CHAN DOWN 6 External Channel Up switch or Data in. Common connection for control, data, and audio output. Impedance to earth ground is a 10-meg resistor in parallel with a 1100 pf capacitor. Isolated audio output. Nominal 14-ohm source impedance with short circuit protection. Intended for a pillow speaker with a low-impedance pad-type volume control. External Channel Down switch. Controlling the TV with Mechanical Switches Pin 4 (common) is momentarily connected to pin 1, 3, or 6 via push-action switches to control On/Off and Channel Up/Down. These pins are at +13 volts DC (when measured from pin 4) with the switches open. Current draw is 8 mA when a switch is closed. (This operation is identical to previous Zenith models using the 5-Wire Interface except that only +7 volts DC was supplied and current draw was only 2.5 mA.) SPKR. VOLUME CONTROL TV ON/OFF CHAN DOWN 4 5 6 1 2 3 (MALE PLUG) CHAN UP 206-4065 Page 15

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Page
15
206-4065
Pillow Speaker Setup
Connect a pillow speaker to the TV
Pillow Speaker Control
Pillow Speaker Interface
This connector furnishes three control lines and an audio output. A patient-pendant remote control,
or entertainment audio and nurse call system may be connected here. All lines are isolated from the
AC power line and earth ground. (Opto-isolators isolate the control lines, and a transformer isolates
the audio. There are no relays or inductive components in the control lines.)
3
TV
ON/OFF
CHAN
DOWN
CHAN
UP
(MALE
PLUG)
VOLUME CONTROL
SPKR.
5
1
4
6
2
1
2
3
4
5
6
3
1
5
2
4
6
TV ON/OFF
OPEN
CHAN UP/DATA IN
COMMON
AUDIO OUT
CHAN DOWN
Controlling the TV with Mechanical Switches
Pin 4 (common) is momentarily connected to pin
1, 3, or 6 via push-action switches to control
On/Off and Channel Up/Down. These pins are at
+13 volts DC (when measured from pin 4) with
the switches open. Current draw is 8 mA when a
switch is closed. (This operation is identical to
previous Zenith models using the 5-Wire Interface
except that only +7 volts DC was supplied and
current draw was only 2.5 mA.)
Pin No.
Purpose
1
External TV On/Off switch.
2
(Not us
ed.)
3
External Channel Up switch or Data in.
4
Common connection for control, data, and audio
output. Impedance to earth ground is a 10-meg
resistor in parallel with a 1100 pf capacitor.
5
Isolated audio output. Nominal 14-ohm source
impedance with short circuit protection. Intended for
a pillow speaker with a low-impedance pad-type volume
control.
6
External Channel Down switch.