Sansui 221 Service Manual

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SERVICE MANUAL

AM/FM STEREO RECEIVER
SANSUI 221/331/331l/33188

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SANSUI ELECTRIC CO., LTD.

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This service manual is designed for service engineers to repair, adjust,
maintain and order the replacement parts of the 331, 331L, 33155, 221
correctly.

When ordering the parts, use the stock number and parts name specific-
ally referring to the Parts Locations & Parts Lists.

For general usage and maintenance of the unit, please refer to the
Operating Instructions attached with the unit.

TABLE OF CONTENTS,

Section Title hi
1. SPECIFICATIONS ................................................ 2
2. PARTS LOCATION AND PARTS LIST ............................ 3

2-1. F-2531 Main Circuit Board ................................ 3, 4
2-2. F-2535 Tuner & Equalizer Circuit Board (MODEL 331, 221) .... 5, 6
2-3. F-254O Tuner & Equalizer Circuit Board (MODEL 33155, 331L).. 7, 8

24. Other Parts (Top Side) .......
2-5 Other Parts (Front Side) ...
THREADING OF DIAL CORD ......

ALIGNMENTS .................................................. 12
4-1. FM Alignment .r

4-2. AM Alignment .......................................... 13, 14
TROUBLESHOOTING CHART .................................. 15
5-4. Operation Block Diagram rrrrrr .H. 16
BOLCK DIAGRAM .............................................. 17
SCHEMATIC DIAGRAM rrrrr 18
7-1. SANSUI 221 Schematic Diagram .. .H. 18
7-2. SANSUI 331 Schematic Diagram .............................. 19
7-3. SANSUI 331L Schematic Diagram ............................ 20
7-4. SANSUI 33155 Schematic Diagram .. . 21
PACKING LIST 22

ACCESSORY PARTS LIST ...................................... 22

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4. ALIGNMENTS

4-1. FM Alignment

Note: IF alignment ...... Connect the output of genescope to TPOl through 100pF ceramic capacitor

GENE SCOPE

DETECTOR PROBE BLOCK

STEREO 56
OUT
__0 VTVM scopz
FM 556 UNIT
0 m m , a ( )
037- M00 00'} 23m 13%;: lN our , v
-c o o o 1% 3 3 ~ 4
AUDIO 050
l
FEED SIGNAL MEASURE
STEP SUBJECT STEP FROM TO OUTPUT ADJUST ADJUST FOR
1. FM IF 1, IF Coil Output 100dB TPOI TP03 T01 MAX. IF Waveform 1
Alignment Genescope F-2540 F-2540 F-2540 as Fig. 4-3
F-2535. . . .Fig. 4-4 or or or
_ > _ F-2535 F-2535 F-2535
F2540....Fig.45 Use
Detector
probe
2. Meter Coil Output 70dB Same as TPO6 T04 MAX. IF Waveform 2
Genescope above F-2540 F-2540 as Fig. 4-3
or or
F-2535 F-2535
3. Discrimi- Same as above Same as TPOS T03 MAXT linearity of S
nator Coil above F-2540 F-2540 curve (Fig. 4-3)
or or
F-2535 F-2535
2. FM Dial Calibration L Dial L03
and RF Alignment Carlbration ANT 1 t F2540
F-2535. Fig. 4-4 9OMHz P REC our 0'
, 400H 100V MOD) ANT -
F2540 , tFlg. 4-5 60dBZ< ° Terminal L or R-CH F 2535 MAX. Output
FM 550 3009 g/Tgg & rcm
106MHz 90 or 106MHz C E F4540
OT
F-2535
2. RF Adj L01, L02
90MH F-2540
z ANT Input or
400Hz (100% MOD) REC OUT F-2535
Beds ANT V L °' N f MAX Output
FM 550 Terminal VTVM 8: $3M
SCOPE
106MHz 9° 0 106MHz F-254O
or
F-2535
3 MPX Alignment 98MH2 d
F-2535, . , ,Fi i4-4 ANT Input 60 B > _
F-254O Fig 4-5 W 555 REC OUT L05 soefsrrlilflzms
"" 3 Pilot 19kHz ANT R-CH F-2540 Confirm
' (10% MOD) Terminal VTVM & or Se aration'
L-CH lkHz 3000 SCOPE F-2535 RVEL Over-than
(40% MOD) 27d8
R-CH (0% MOD)
Stereo 56
* Signal Meter .......... 4.3 on Meter (98MHz ANTENNA - -
input sods 400Hz 100% MOD) Abbreblatlon
Indicator level ........ ZSdB . AM standard Signal Generator AM 536
FM Stereo Generator .Stereo 36
Audio Oscillatur .. Audio 080
AM FM Generator Oscilloscope Genescope
FM Standard Signal Generator FM SSG
Oscilloscope ....................... .Scope

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