Cambridge Audio 650R user manual Troubleshooting

Troubleshooting

A low hum or buzz sound can be heard

Power cords or lighting placed near this product.

Analogue inputs not connected securely.

Sound is not audible from one channel

Speaker connections disconnected.

Speaker set to “None” in OSD setup menu.

Sound cuts off when listening to music or there is no sound even though power is ON

Speaker impedance is less than prescribed for the 650R. The unit is not adequately ventilated and may be overheating.

Low bass or “phasey” response

Speaker polarity (+/-) of one or more speakers is reversed.

An unusual hissing noise is heard when listening to a radio broadcast in stereo, but not heard when listening in mono

A slight noise may be heard because the method used for modulation of FM stereo broadcasts is different than that used for mono broadcasts.

Aerial quality also effects the level of hiss heard.

Noise is excessive in both stereo and monaural radio broadcasts

Poor location and/or direction of the antenna.

Transmitting station is too far away.

No sound from the rear speakers

Source being played is not recorded in surround sound.

Speaker/s set to “None” in OSD setup menu.

A stereo mode has been selected.

No sound from the centre speaker

Centre speaker has been set to “None” in OSD setup menu. A stereo mode has been selected.

No sound from the subwoofer

Sub has been set to ‘Off’ in the OSD setup menu or via the remote.

DTS Neo:6, DD PLII/IIx modes (which have no LFE channel) have been selected with all speakers set to “Large”.

Remote control is not working

The batteries are flat.

The remote is too far from the receiver or out of the effective range.

No sound from speakers when connected to a digital input

Audio input type is set to analogue (check display). Press the Audio Input Type button to switch to digital.

No sound from speakers when connected to an analogue input

Audio input type is set to digital. Press the Audio Input Type button to switch to analogue (check display).

Audio input type can also be set in the Input/Output Setup menu of the OSD.

No Sound from any speakers

Receiver is set for ‘Pre-out’ operation (See para 7.1).

By entering the OSD menu, selecting the input/output setup menu, the Preamp out setting can be changed from ‘Normal’ to ‘Pre-out’. This disables the internal amplifiers when an external decoder amplifier is being used. Reset this to ‘Normal’ to restore sound.

No Sound from front speakers, but rear speakers work

Receiver is set for ‘Ext 2Ch’ operation (See para 7.1).

By entering the OSD menu, selecting the input/output setup menu, the Preamp out setting can be changed from ‘normal’ to ‘Ext. 2 Ch’. This disables the internal amplifiers for the front channels when an external amplifier is being used to drive those channels. Reset this to ‘Normal’ to restore sound.

Maximum or Minimum (mute) volume level can no longer be achieved. (Display will not reach 0db or - 89db)

If the front left and right channels are adjusted using the OSD Level Calibration (balance) settings up or down to provide an off-centre front sound stage the result is that the maximum and minimum volume setting (the setting and the db level displayed, not the actual amount of volume achievable) is naturally limited by the same degree. (A small red ‘BAL’ icon appears on the front panel display to show channel balance is now off- centre). For example, adjusting the right channel to +10db will mean that the maximum sound level is now reached when the display shows -10db (not 0db as expected). Readjust the front right and left levels back to 0db to restore full volume excursion.

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