Sansui AU 999 Service Manual

Page 2

Congratulations on Joining the thousands of proud. satisfied owners of quality Stereo
components from Sansui.

The AU-999 is the most advanced professional control amplifier ever manufactured by
Sansui. Designed specifically for an ardent audiophile like you, it features the refined dull
black panels common to all AU series professional control amplifiers from Sansui.

The preamplifier section is constructed of carefully selected low-noise PNP silicon tran~
sisters, while the power amplifier section features direct-coupled circuits specially de
veloped with the improvement of tone quality in mind. Together, they permit the AU-999
to deliver a full 180 watts (4Q)in music power output with unprecedentedly good tone
quality.

The AU-999 is lavishly endowed with accessory circuits. These include a Tone Selector
circuit, an improved form of the Triple Tone Control circuit that offers a choice in selec-
ting the critical frequencies of tone control; a Speaker Selector which permits connecting
three sets of speaker systems; a Balance Check Switch which simplifies the job of adjusting
for optimum balance of the right and left channel sound volumes; facilities to connect
two phonographs and two tape decks; and a tape reprint circuit which makes it possible
to copy a recorded tape by utilizing two tape decks. Special provisions have also been
made to permit the amplifier to be built up into an electronic crossover stereo system and
permit comparing such a system with a standard stereo setup.

From the superior performance characteristics to the careful finish of control knobs,
Sansuis tradition of quality is evident. Packed with the most advanced circuits throughout,
the AU-999 comes to you with the full confidence and guarantee of the manufacturer.

It is now up to you to read the contents of this manual carefully before setting out to use
it, so you may operate it correctly and obtain the maximum performance it is capable
of offering for many years to come.

CONTENTS

SWITCHES AND CONTROLS .......................................... 3, 4, 5, 6
OPERATIONS .................................................................. 7, 3
----SPEAKER CONNECTION
-RECORD PLAYING
OPERATIONS ................................................................ 9, 10
-RADIO RECEPTIONS
-MICROPHONES
OPERATIONS ................................................................ 11, 12
--TAPE PLAYBACK
--TAPE RECORDING
ELECTRONIC CROSSOVER SYSTEM .................................. 13, 14
MAINTENANCE .................................................... 15, 16, 17,18
ACCESSORIES ........................................................................... 18
SPECIFICATIONS .............................................................. 19
CHARACTERISTICS .......................................................... 20
TROUBLESHOOTING CHART .......................................... 21, 22
CUSTOM MOUNTING ...................................................... 23, 24
DISASSEMBLY PROCEDURE ................................................ 25
BLOCK DIAGRAM/LEVEL DIAGRAM ...................................... 26
ALIGNMENT ................................................................ 27, 28
--TEST POINTS
-MAIN AMP. SECTION OUTPUT BALANCE/CURRENT ADJUSTMENT
PRINTED CIRCUIT BOARDS AND PARTS LIST ...... 29, 30, 31, 32, 33, 34
OTHER PARTS .............................................................. 35, 36

OTHER PARTS AND THEIR POSITION ON CHASSIS .............. 37, 38

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1. Turn the 'IAlE-TCLTrxPli lxlillxlNT SA'RILh
to DECK 2 1.

2. Set tape deck 1 in the recording mode.

3. Set tape deck 13 in the playback mode.

1. Use other controls and switehes appropriately.
Notes:

1. Tape recorded sound cannot be controlled by
the t't ntrols and switches on the. front panel of the
amplifier. The}: control sound iron: the Speakers
only.

W

Al'~999, rather than through IlliLI'Ol.)hOllCS placed
m from of the speakers.

J. Before connecting and operatingr the tape decks,
be sure to look up the manufacturer's operating
instrUetions.

4. The TAPE MONITOR SWltt'h should he in the.
SOITRCE position ext'ept when the tapes are being
monitored or played hat-k hy the tape deck. When
the switch is in the PLAY BACK position. signals
from any other source Will not he heard from the

'3. For better results. record diret-tly through the

spemters.

l 41, . "1.4..
. T ' l y ' ill
I 1' I TAPE DECK I r
l ll I - ' t
I . ' , y '1 ' l l I l '
LU j __ l RECOQD- r '~~\ K I V. 7 -
TAPE oecxomv W5"; 3 * PLAYBAC ' "' . 'V r
, L i' RECORDING . H ., . V, TO TAetoteK
l 1 ,4 : Eli-m .'
l f.-_.i- A--.-r--.-_-_...-..,1 u pm It I, :l
i l W--- __,,,,-_A_,,-i. ; .. 1 i , l I
l r 1 , [ .0 9.1.9... at
I PLAYBACK TAPE DECK
t
1

SEE "SPEAKER CONNECTION"
WALL OUTLET

LEFT CHANNEL
RIGHT CHANNEL

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