Cambridge Audio 851W User Manual download pdf (Page 18)

Trigger In

In the System settings menu, press the Power input select button to

enter the submenu. Press the Trig In input select button to enable the

function.

Volume

Trig In

Power

Auto PwD

Mode

Press the Mode button to exit the submenu.

Auto Power Down (APD)

In the System settings menu, press the Power input select button to

enter the submenu. Pressing the Auto PwD input select button will scroll

through the options of 2 hours, 1 hour, 30 mins, 15 mins, 10 mins, 5

mins and Auto PwD (disabled).

Volume

Trig In

Power

Auto PwD

Mode

Press the Mode button to exit the submenu.

CAP5: Five-way protection system

Cambridge Audio has developed a proprietary protection system to

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When the 851E and the 851W are paired, if any, the 851E can detect

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851E LCD display.

To achieve this, connect the 'Control Bus Out' from the 851W to the

'Control Bus In' on the 851E.

851E

851W

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1. W DC Offset – DC detection

Indicator – Unit has switched off during operation.

Description – CAP5 offers loudspeaker protection if the output of the

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although detecting it could just save those expensive loudspeakers.

Remedy – Due to the necessary sensitivity of the DC protection circuit,

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If this fault occurs please switch the unit off, power up again and check

operation with a reduced volume level. If the DC fault occurs again

please contact your dealer for service.

2. W Overtemp – Over temperature detection

Indicator – Unit has switched off during operation.

Description – CAP5 includes temperature detection which constantly

monitors the heat generated by the output transistors. If the monitored

temperature reaches a high level (suitably within the limits of the output

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a cabinet or the ventilation slots are obstructed, the over-temperature

detection may activate/reactivate after a short listening time.

Remedy – The unit is not damaged, although it should be left for 15

minutes to cool down before being switched out of Standby.

3. W Overload – Overvoltage/overcurrent detection

Indicator – Unit has switched off during operation.

Description – CAP5 offers V/I protection by constantly monitoring the

output transistors to keep them working inside their Safe Operating

Area (SOA). The SOA is a set of limits given by the output transistor

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short-circuits on the speaker terminals during use.

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Reduce the volume. Also check to see if there is a short- or partial short-

circuit between the loudspeaker terminals.

Note: If the indication remains the same and multiple loudspeakers are

being used on each loudspeaker output, then please remove a pair and

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will detect this situation. If the indication remains the same with only one

set of loudspeakers connected, there may be a fault with one or both of

the loudspeakers.

4. W Skp shrt – Short-circuit detection

Indicator – As the unit attempts to come out of Standby mode.

Description – During power up from Standby, CAP5 performs a check

on the loudspeaker terminals to see if a short across the terminals has

been accidentally introduced. If the resistance measured across the

loudspeaker terminals is too low, the unit will remain in Standby mode

until the fault has been removed and power up is re-attempted.

Remedy – User-related fault. There may be a short-circuit between

the loudspeaker terminals. Check all loudspeaker connections before

attempting to switch the unit out of Standby.

5. W Clipping – Intelligent clipping detection

Indicator – Volume is nudged down automatically. Note that this

automatic function will only work if the 'Vol Clipping' is enable in the

Input sub menu.

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to clip or overdrive at its output, which can damage loudspeakers and

degrade the sound. Clipping distortion is caused at high volume levels

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When CAP5 detects clipping, the volume will be automatically nudged

down until CAP5 detects an undistorted output.

The clipping detection is disabled by default. However, to enable the

clipping detection, hold down the Standby/On button during power up

(whilst switching on the unit at the rear panel power switch). The unit will

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Cambridge Audio 851W User Manual Page 18

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