Wheatstone TV-80, Техническое руководство

Страница: 62 / 120

C O N T R O L R O O M
page 5 – 3
TV80 / Sep 98
Headphone Section
The module’s headphone circuit follows the monitor source select
switching. There are two headphone outputs: one electronically balanced
line level out (programmable as either pre or post HDPN level control),
and the other driven by a built-in amplifier (amplifier output may be stereo
or L+R summed). Note the headphone outputs are normally subject to the
console’s muting and solo/cue interrupt circuits; however, these may be
defeated by front panel switching if desired.
CR Section
Control room output is determined by the module’s monitor source
select switching and is subject to the console’s muting and solo/cue
interrupt circuits (front panel switch defeatable). A CR ON switch turns
the console’s control room outputs on and off. There are two such outputs;
both are electronically balanced line level: one is post level control
(variable), the other pre (fixed).
MODE Switch
The mode switch affects both CR and HDPN outputs as follows:
Left Mode (LT) – Left signal to both channels
Right Mode (RT) – Right signal to both channels
Mono Mode (MN) – Left plus right sum signal to both channels
Stereo (ST) — “Normal” mode (MODE switch illuminated).
Tally Ports
The CR-80 module outputs the console’s On-Air tally function. There
are two ports: relay closure and opto-isolated. Both are controlled by the
console’s mute/tally control lines (four; which one activates the CR tally
port is determined by a PCB-mounted dipswitch).
Metering
Solo/Cue (mastered at CR-80; metered at VO-80 module)
The console’s solo/external left/right meter pair is multi-functional.
Under normal use, they will monitor the external line source selected at the
VU/Oscillator module’s “External Meter Select” switches (see page 7-3;
four external sources are available, brought in at the VO module’s rear
panel upper DB-25 connector). Whenever CUE or SOLO is activated
anywhere on the console, however, the meters automatically switch to the
activated signal (a “solo/cue activated” LED below the external source
switches on the VO-80 module lights when this happens). When solo/cue
is de-activated (by pressing the pertinent switch again) the meters return
to the selected external signal.
To reiterate: There are two sets of front panel calibration trimpots associated
with the solo/ext VU meters. The first set calibrates the meter driver circuitry
itself at the VO-80 module (“Solo/Ext”— located at the top of the VO module
faceplate). The second set (“Solo/Cue”) is located at the top of the control room
monitor (CR-80) module; these adjust the level of the solo/cue signal being fed
to the VO-80 module circuitry.
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HDPN
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CR
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CUE
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MONITOR
SELECT
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MASTERS
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HDPN
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SOLO/CUE
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