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Powering On/Off the 851W
As well as simply using the front panel button the 851W features multiple
ways it can be automatically powered on and off.
A trigger 5-12V AC or DC input to the Trigger In on the rear panel can
power up or down the unit from custom install systems or preamps with
trigger outputs. This is an 'edge triggered' input so that the 851W will
power on with a zero-to-positive voltage transition and power down with
a positive voltage to zero transition.
Alternatively the 851W features a Control Bus Input for use with our
matching 851E preamp that allows a single RCA/Phono to RCA/Phono
cable to be connected between them that allows the 851E preamp to
communicate with the 851W and automatically control its power status.
For custom install situations it is also possible to send Infra Red or
Control Bus commands (see our website for the code table) to the 851W
and also affect power control.
Lastly the 851W can sense its audio inputs and automatically power up
if a signal is present and conversely Auto-Power Down if no signal has
been present for 30 mins.
To enable/disable Auto Power Up/Auto Power Down see the next section
on the hidden configuration menu.
Custom installation (C.I.) use
The 851W features a Control Bus input/output that
allow un-modulated remote control commands
(positive logic, TTL level) to be received electrically
by the unit and looped to another unit if desired.
These control commands are typically generated
by custom installation (multi-room) systems or
remote IR receiver systems. The Control Bus sockets are colour-coded
orange.
An IR Emitter Input is also provided that allows modulated IR remote
control commands to be received electrically by the unit. Commands on
this input operate the unit only and are not looped out demodulated on
the Control Bus Output.
The unit responds to 'direct' IR/Control codes as well as toggle codes
for some features to simplify programming custom installation systems.
Special direct On/Off and Mute commands can be accessed from the
851E pre-amplifier remote control for teaching into C.I. systems as
follows:
1. Press and hold the Standby/On button. The remote first generates
a standby (toggle) command. Keep the button held down, after 12
seconds an amplifier "On" command will be generated. If the button
is kept held down for a further 12 seconds, an amplifier player "Off"
command is generated.
2. Press and hold the Mute button. The remote first generates a mute
(toggle) command. Keep the button held down, after 12 seconds a
"Mute on" command will be generated. If the button is kept held down
for a further 12 seconds, a "Mute off" command is generated.
These commands are recognised by the 851W via the IR Emitter input.
A code table for this product is available on the Cambridge Audio website:
www.cambridge-audio.com
10
Configuration menu
In Standby mode, press and hold the Standby/On button to enter the
Configuration menu.
The Left and Right 'Output' LED will start blinking to indicate that you are
now in the Configuration menu.
Pressing the Standby/On button will shuffle through these different
setting options:
Right 'Protection' LED - Auto power down enabled (by default).
Right 'Protection' and 'Clipping' LED - Auto power down and auto power
up enabled.
Left and Right 'Output' LED - All features are now disabled.
IR Emitter
Control Bus
In
In
Out
To exit the Configuration menu, press and hold the Standby/On button.
Note: If a second 851W is added to the chain, the below configuration
menu is applicable only to the second unit.
Left 'Protection' LED - Second 851W enabled.
Left and Right 'Protection' LED - Second 851W auto power down enabled.
Left 'Protect' and Right 'Protect and Clipping' - Auto power down and
auto power up enabled.
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