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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 651R/751R.
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 Dolby Pro Logic II/IIx modes (which have no LFE channel)
have been selected with all speakers set to “Large” (and bass augment off).
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 or HDMI
Audio input type is set to analogue (check display). Press the Audio Input
Type button to switch to digital or HDMI.
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.
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.
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.
Troubleshooting
An IR Emitter Input is provided that allows
modulated IR remote control commands to be
received electrically by the unit. An IR receiver input
and Control Bus connections, similarly allows un-
modulated commands to be received. An RS232 port is also
featured which allows the 651R/751R to be controlled by C.I. systems.
In addition the unit features 'direct' IR/Control codes as well as toggle codes
for some features to simplify programming custom installation systems.
Special direct On/Off and Mute On/Off commands can be accessed on the
supplied remote control for teaching into C.I. systems as follows:
1.Press and hold the Standby/On button on the remote control. The remote
first generates it's standby (toggle) command. Keep the button held down,
after 12 seconds an AV receiver “On” command will be generated. If the
button is kept held down for a further 12 seconds, an AV receiver “Off”
command is generated.
Repeat this procedure with the Mute and Stereo/Mono buttons to send
On/Off commands. The Tuner AM/FM button also provides unique FM and
AM commands to allow switching to a specific band.
A full IR code table and RS232 protocol for this product is available on the
Cambridge Audio website at www.cambridge-audio.com.
The 651R/751R has a function that preserves the preset memory and other
settings. In the event of a power failure, or if the power cord of the unit is
disconnected from the mains outlet, the back-up memory will preserve the
preset memory.
If it is desired to reset all settings to their factory defaults (or in the unlikely
event that the unit locks up due to an electrical discharge etc), with the unit
on (out of Standby) press and hold the BD/DVD and Analogue Stereo Direct
buttons on the front panel at the same time for three seconds.
“RESET” will appear briefly on the front panel display and all settings will be
erased.
Reset/Back-up memory
Custom installation (C.I.) use
