Sansui QS 800A Service Manual

Page 1

REGULAR MATRIX

-
OPERATING INSTRUCTIONS

& SERVICE MANUAL

-
4-CHAN N EL REAR AMPLIFIER

SANSUI ELECTRIC CO., LTD.

Page 2

Congratulations on joining the thousands of proud, satisfied owners of quality
stereo components from Sansui.

The QS-800A is a combination of Sansuis new QS regular matrix system
4-channel decoder and a high~performance ZOO-watt stereo amplifier to
amplify the rear channel signals for 4-channel sound reproduction.

The decoder features the exclusive QS Vario-Matrix circuitry which provides
optimum separation among the reproduced sounds. When added to your
present stereo system, this decoder and the rear channel amplifier will work
together to (l) decode encoded 4-channel program sources back into 4-channel,
and (2) transform (synthesize) conventional 2-channel sources into 4-channel.
The QS-800A as a whole also offers complete provisions for reproducing
discrete 4-channel program sources and for reproducing Z-channel sources in
2-.channel stereo if you so desire. As such, it is one of the most complete,
most authentic means of upgrading your stereo system to immediate 4-channel
status.

80 that you may take full advantage of its immense versatility and high
performance, it is very important that you read this booklet of operating
instructions once carefully. Then youll be better prepared to enjoy 4-channel
stereo at its very best for years to come.

CONTENTS

SWITCHES AND CONTROLS ................................................ 3~5
TO ENJOY 4-CHANNEL STEREO AT ITS BEST ........................ 6
CONNECTIONS ..................................................................... 7~10
ADJUSTMENTS ..................................................................... 11
OPERATIONS ............................................................. '. .......... 11, 12
SIMPLE MAINTENANCE HINTS ............................................. 13, 14
SERVICING/ ACCESSORIES ....................................... . ............ 14
SPECIFICATIONS .................................................................. 15 '
SCHEMATIC DIAGRAM ......................................................... 16, 17
CUSTOM MOUNTING ............................................................ 18
DISASSEMBLY PROCEDURE/ TEST POINTS ........................... 19, 20
PRINTED CIRCUIT BOARD AND PARTS LIST ........................ 21~26

OTHER PARTS AND THEIR LOCATION ON CHASSIS ............... 27, 28

Page 18

CUSTDM MOUNTING

The diagrams below show the dimensions required
for mounting the QS-800A into a custommade
cabinet. Note that ample.space is provided for
complete air circulation above and below the unit.
1. Be sure the cabinet cutout measures 178/32 X
49/13 as indicated in the diagram.

2. Place two bars on the floor of the cabinet as
illustrated. Each bar should measure 25/32"'X 25/32
X9l/13-

3. Drill two holes in the bottom of the cabinet at
points corresponding to holes in the bottom of the

receiver.

4. Remove the receiver from the wood case (refer
to DISASSEMBLY PROCEDURE on page 19).
5. Remove the two screws on the front panel side
of the receivers bottom board.

6. Insert the QS-800A into the cabinet through the
cutout until the edges of its front panel are flush
with the cabinet, and secure both receiver and
cabinet with the two butterfly bolts and washers
(supplied).

Width of tront'panel

" 440-.173' 53
Width of cabinot's front cutout . -
" 434m. 171? f
III- -- -- \ --
\Outsido ode of cabinet \Outsida edge of amplifior's trontjanei
! I " I. | I -- .g.
l l i I l ( \ ( I W l g. as
o _ .
:g-é gé
f f" f ' 1 '3 V
\x (:11:sz \) \) 1:311:21: J O I
fi PET-1

Amplifier fixflbutterfly bolts

170m. 6%

Minimum height for air circulation

(10'fl. if)

(IS-u. JP)
Maximum height trom
cabinet's bottom board

350-. 14'

_ 18-