Sansui 771 - Page 2

771
This service manual is designed for service engineers to repair,
adjust, maintain and order the replacement parts of the 771 correctly.
When ordering the parts, use the stock number and parts name speci-
fically referring to the Parts Locations & Parts List.
For
general
usage
and
maintenance
of
the
unit,
please
refer
to
the
Operating
Instructions
attached
with
the
unit.
TABLE OF CONTENTS
Section
Title
Page
1,
:
SPECIFICATIONS
«605053.
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2
2.
BLOCK
DIAGRAM
AND
LEVEL
DIAGRAM
..............--------
3
94.-
“Block:
Diagram:
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er
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2-3;
.
‘Vevel
Didgtam:-
246
cfas0es
Motes
Meade
dee
esas
eG
esas
wel
ne
4
3.
THREADING
OF
DIAL
CORD
..................-2
2.
cece
eee eee
ees
5
4.
ALIGNMENTS
AND
ADJUSTMENTS
.............----.-0
0s
sees:
6
4-1,
Driver
Circuit
Board
Adjustment
...........--..2
ee
eee
ee
eens
6
4-2.
FMIF
Alignment..........
0...
eee
eee
ee
ete
eee
eee
ene
es
7
4-3,
FM
Dial
Calibration
and
RF
Alignment
...........--+++++--
7,8
4-4,
FM
Signal
Meter,
Mono
Distortion
and
Muting
Adjustment
....
8
4-5.
MPX
Alignment
.........ccce
cece
erence
eee
e
rene
een
eter
enee
9
4-6.
AM
IF,
Dial
Calibration,
RF
and
Signal
Meter
Alignment....
9,
10
5.
TROUBLESHOOTING
CHART
..............-.
6.
eee
e
eee
eee
ees
11
5-1.
Troubleshooting
on
Power
Supply
Section
..........-..+++-.
11
5-2.
Troubleshooting
on
Audio
Section
..........
6...
eee
e
eee
eeee
11
5-3.
Troubleshooting
on
Tuner
Section
..........--++
+++
eee
ee
11,12
6.
PARTS
LOCATIONS
AND
PARTS
LIST
............--.----+5--
13
6-1.
F-1479D
Tuner
Circuit
Board............
00
eee
eee eee
13,14,
15
6-2.‘
F-1504
Mic
&
Tone
Control
Circuit
Board............-...555.
15
6-3.
F-1503
Equalizer
Circuit
Board.........-.
2.
seers
eee
ee
eee
ee
16
6-4.
F-1505
Filter
Circuit
Board.
.......
0...
ccc
ccc
c
ener
eer
e
ee
eeee
17
6-5.
F-1490
De-emphasis
Circuit
Board
........--..
ss
eee
e
eee
17
6-6.
F-1499A
Driver
Circuit
Board
...........
0c
eee
eee
ee
eee
17,18
6-7.
F-1500C
Power
Circuit
Board
...........0
eee
eee
eee
eee
19,
20
6-8.
Other
Parts
(Front
Side)....
6.0.6...
cece
eee
eee
eee
eee
21,22
6-9.
Other
Parts
(Top
Side)
..........
sce
e
ere
e
cence
eee
eee
n
eee
23
6-10.
Other
Parts
(Bottom
Side)........
ec
cece
cece
eee
ete
eee
eee
ee
23
7.
SCHEMATIC
DIAGRAM
OF
TUNER
SECTION
..............-...
24
8.
SCHEMATIC
DIAGRAM
OF
AUDIO
SECTION
..............-..-
25
Q:
PACKING
LIST
cciscicc5
6k
he
dcs
ari
iceeie
dienes
ea
eae
26
10.
ACCESSORY
PARTS
LIST
...............
20:
cece
eee
teen
ees
26
11.
MAINTENANCE
..............0-..
000
eee
e
ee
eee
een
eens
26
11-1.
Voltage
Adjustment......
6.60.6...
c
eee
eee
eee
eens
26