Yamaha HTR-5640 Owner's Manual page 57

Problem
No sound from the rear "SOUND 1C REAR LR" or "SOUND 1D
center speaker.
REAR CT" on the set menu is set to NON.
The Dolby Digital EX or the DTS-ES
decoder is not switched on.
A "humming" sound can
Incorrect cable connections.
be heard.
The volume level cannot The component connected to the OUT
be increased, or the (REC) jacks of this unit is turned off.
sound is distorted.
The sound effect cannot
It is not possible to record the sound effect
be recorded. with a recording component.
HTR-5650 There is no source component connected
A source cannot be to the DIGITAL INPUT jacks of this unit.
recorded by a digital
recording component
connected to the
DIGITAL OUTPUT jack of
this unit.
The sound field "OPTION 2 MEM. GUARD" in the set
parameters and some menu is set to ON.
other settings on the
unit cannot be changed.
The unit does not
The internal microcomputer has been
operate properly. frozen by an external electric shock (such
as lightning or excessive static electricity)
or by a power supply with low voltage.
"CHECK SP WIRES"
The speaker cables are short circuited.
appears on the front
panel display.
There is noise interfer- This unit is too close to the digital or high-
ence from digital or frequency equipment.
high-frequency
equipment, or this unit.
The unit suddenly turns
The internal temperature has become too
into standby mode. high and the overheat protection circuitry
has been activated.
Cause
Select LRG or SML.
Press 6.1/5.1 on the remote control to switch the
decoder on.
Firmly connect the audio plugs. If the problem
persists, the cables may be defective.
Turn on the power to the component.
Connect the source component to the DIGITAL
INPUT jacks of this unit.
Set "OPTION 2 MEM. GUARD" in the set menu
to OFF.
Disconnect the AC power cord from the outlet
and then plug it in again after about 30 seconds.
Make sure all speaker cables are connected
correctly.
Move this unit further away from such
equipment.
Wait until the unit cools down and then turn it
back on.
TROUBLESHOOTING
Remedy Refer to
page
40
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53