Sansui 5000X Service Manual

Page 2

CEINTENTS

GENERAL TROUBLESHOOTING CHART ........................ 3,4
DISASSEMBLY PROCEDURE ......................................... 5
BLOCK DIAGRAM ......................................................... 6
CUSTOM MOUNTING ................................................... 7,8
ALIGNMENT

TEST POINTS ............................................................ 9

FM ALIGNMENT PROCEDURE ............

FM MULTIPLEX ALIGNMENT PROCEDURE ............... 11

AM ALIGNMENT PROCEDURE .................................... 12

CURRENT ADJUSTMENT/OUTPUT ADJUSTMENT ...... 13
PRINTED CIRCUIT BOARDS AND

PARTS LIST .................. 14, 15, 16. 17, 18, 19, 20,21, 22,23, 24

OTHER PARTS AND THEIR POSITION ON CHASSIS...25, 26

Page 4

GENERAL TROUBLESHOOTING CHART

if the amplifier is otherwise operating satisfactorily. the
more common causes of trouble may generally be at-
tributed to the following:

1. incorrect connections or loose terminal contacts. Check
the speakers, record player» tape deck, antenna and line

ponent. be sure to read the manufacturer's instructions.

3. Improper location of audio components.

The proper

positioning of components, such as speakers and turntable,

is vital to stereo.
4. Defective audio components.

cord .

2. lmproper operation. Before operating any audio com-

The following are some other common causes of mal-

function and what to do about them,

PROGRAM

SYMPTOM

PROBABLE CAUSE

WHAT TO DO

AM, FM or FM-
MPX reception

A. Constant or intermib
tent noise heard at

times or in a certain

area.

* Discharge or oscillation
caused by electrical applis
ances. such as fluorescent
lamp. TV set. DC. motor
rectifier or oscillator

* Natural phenomena, such
as atmospheries. static or
thunders bolts l

* insufficient antenna input
due to ferroconcrete wall
or long distance from the
station

* Wave interference from
other electrical appliances

Attach a noise limiter to the clean-
cal appliance. or attach it to the
amplifier's power source

install an outdoor antenna and
ground the amplifier to raise the
signal-to-noise ratio.

Reverse the power cord plug-recepta-
cle connections.

If the noise occurs at a certain
frequency. attach a wave trap to the
ANT. rnput.

Keep the set at a pro r distance
from other electrical app iances.

AM reception

B. The needle of the
signal and tune meter
does not move sharply

* Receiver is loaned in a
weak Signal area

The needle swing varies depending
on the stations

C. The zero point of the
meter diverges much

A. Noise heard at a
particular time of a
day. in a certain area
or over part of dial

" Regional difference in field
intensity,

l
l
|

* Due to the nature of AM i

broadcasts .

The unit is not at fault.

Install the antenna for maximum
antenna efficiency. See "ANTEN-
NA" in the operating instructions.

in some cases. the noise can be
eliminated by grounding the ampli-
fier or reversmg the power cord plug-

receptacle connections.

B. Highrfrequency noise

* Adjacent-channel inter-
ference or beat interference

* TV set is too close to audio
system

Although such noise cannot be elimi-

nated by the amplifierl it is advisable

to adjust the TREBLE control from
midpoint to left and switch on the

HIGH FILTER

Keep the TV_ set at a proper distance
from the audio system.

FM reception

A . Noisy

Note: FM reception is affected considerably by
transmission conditions of stations: power and
antenna efficiency. As a result. you may receive
one station quite well while receiving another

Station poorly

" Poor noise limitter effect or
too low SN ratio due to in-
sufficient antenna input.

install the antenna (supplied) for
maximum signal strength.

If this does not prove effective, use
an outdoor antenna designed ex-
clusively for FM. When you use a
TV antenna for both TV and PM
with a splitter, make sure TV recep-
tion is not affected

An excessively long antenna may
cause noise