Sansui QR 6500 Service Manual

Page 5

PROGRAM

SYMPTOM

PROBABLE CAUSE

WHAT TO DO

FM- MPX
reception

.Noise heard during

FM-MPX reception
but inaudible during
FM mono reception

* Weaker signal because
service area of FM-MPX
broadcast is only half that
of FM mono broadcast

* Orient antenna for maximum an-
tenna input

* Switch on High Filter and/on turn
Treble control counterclockwise

. Channel

separation
deteriorates during re-
ception

* Excess heat

* Circulation of room air is important
to receiver. Be sure that receiver is
well ventilated

. Stereo indicator blinks

on and off

* Interference

* Indicator is not faulty, adjust VRm

Record playing
or tape playback

. Hum or howling

* Turntable placed directly on
speaker

* Wire other than shielded
cable used

* Loose terminal contact
* Shielded cable too close to

power cord, fluorescent lamp
or other appliances

* Nearby amateur radio sta-
tion or TV transmission an-
tenna

* Place cusion between turntable and
speaker cabinet or place them away
from each other

* Connecting shielded cables should be
as short as possible

* Turn on Low Filter and turn Bass
control counterclockwise

* Consult nearest Radio Regulatory
Bureau

. Surface noise

* Worn or old record

* Worn phono stylus

* Phono stylus is dusty

* Imploper stylus pressure

* Recondition playback head of tape
deck or the stylus of turntable

* Tum Treble control counterclockwise
* Turn High Filter on

4Achannel stereo
playback

Position of musical in»
struments and vorce
not clear

* Incorrect phasing of speak-
ers or input connections

* Check phasing of speakers and input
connections

* Change rear speaker position and/or
direction