Sansui A 909 Service Manual

Page 1

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SERVICE MANUAL

Power output
Mint RMS, both channels driven from 20 to 20,000 Hz,
with no more than 0.05 96 total harmonic distortion

INTEGRATED DC SERVO swims:f?."?°;':;°mi°""
STE RED AMPLIFIER Total harmonic distortion

............ less than 0,05 % at or below rated
min. RMS power output

Frequency response (at 1 watt)
I ............ s to 60,000 Hz
H dB, -2 dB

RIAA curve deviation (PHONO, 20 Hz to 20 kHz)

............ +0.5 dB, -05 dB
Input sensitivity and impedance (1 kHz, for rated power
output)
PHONO ....... 2.5 mV/47 kllohms

(Max. input capability; 120 mV at 1 kHz, less than 0.1%
total harmonic distortion)

TUNER, TAPE PLAY

l50 mV/47 kllohrns

Output level (1 kHz)

4m .u.; A q

TAPE REC ..... 130 mVintD 47 kilohms
, Signal to noise ratio (short-circuit, A-network)
' PHONO . , 72:18
I! TuNERJuE PLAV
............ 90 dB
Power requirements
Power voltage . _ 120/220/240 V (SQ/60 Hz)
For U.S,A. & Canada
........... 120 V (60 Hz)
Power consumption
............ 230 watts 280 VA Rated
350 watts Maximum
Dimensions ....... 430 mm (16-15/16) W

118 mm (4-11/16") H

245 mm (9-11/16) D
Weight .......... 5.6 kg (12.4 lbs.) net

6.4 kg (14.1 lbs.) panked

" Design and specifications subject to change without
notice for improvements.

SANSUI ELECTRIC CO., LTD.

Page 3

2. OPERATION OF COMPU SELECTOR (See Block Diagram)

* The amplifier (N909) has COMPU SELECTOR function Which Bl Operation when one of the 'function switches of com- E
works with a tuner (T-707 or T-909), a turntable (P-D30, P-LAO bined unit is controlled .1
0' 50): a We Ck (07: 9'77" 999 1) when the START/STOP switch of the turntable (P-DBO, P-L40 '
. or P-LSO) is pushed, the input selector of the amplifier is auto-
A. Operation when one of the input selector switches of mamauy s to the PHONO mode
the amplifier is pushed 2) When one of the FM/AM selection switch and the UP/DOWN
l) a When the PHONO switch is pushed, the platter of the turntable switch of the tuner (T-7o7 or T-909) is pushed, or the tuning
(P-L4o or P-LSO) starts rotating and the tonearm automatically knob of the tuner is touched by hand, the input selector of the
moves to play record. amplifier is automatically set to TUNER mode.
e When the TUNER or TAPE-1 switch is pushed during record 3) When the PLAY switch of the cassette deck is pushed,the input
play, the tonearm returns to the arm rest and the platter stops selector of the amplifier is aUtomatically set to the TAPE-l
rotating automatically. mode.

2) a When the TAPE-1 switch is pushed, the cassette deck (D-77F
or D-77R) starts automatically to playback a tape.
a When the PHONO or TUNER switch is pushed during tape
playback, cassette deck stops automatically.

Operation of COMPU SELECTOR function
r .
own-n A-sos it operated u below: i E
Amphirer l Turnmbli I enssette Deck
push me TUNER m A809 1 ?-L40 or P-LSO 1 D-77F or Dr77Fl
selector swllch I 1
E The tu ntuhle l
Push the PHONO input I own! I
selector SWIM ; automatically and ;
record play begins
1
Push the TAPEJ input V l I
, selector swnch I ' l .
| l l i i i i
r l i
Whnn 1-707 or 1.909 il our-tea u i r E I E E...- E
Maw; » f The cassette deck
E 1 . L operates 21
When up cr DOWN sw-veh * ODtminu record um i mmWV 3"
is pushed E E ! mm , play back starts
l -,
' The turntable I 2
When the SELECTOR switch _._E ____ "9 mm E operates luloreturn l E i
position (FM or AM) Is changed, 1- sel':;°.'rlj;}%} V -1-l E-l-o and is automltlcally r g
i stopped t
- | l l W e. m .J
When the TUNING contrul E I i i e l r
IS rotated E i 7 l I
E ' ' Z ' l
I i |
| I |
'Whnn P-nae, P-Lw or P-LBO is E I I 5 i l E courting up. pllv hnek
taper-tea .. below: E I | I ; i ; n...
I
lncut telecmr x__ _ ,______ ____ _ ______ _ l rha cassette aeck
Push the START/STOP switch -- 7- - o is automlgauéiv | '1 - 7' " is Iutozutically
sew! PH _.__.__.._._____._..,._~--. steppe.
t i
I
l i
ewhcn nuns, D-77R or p-sso il Lu»... 1 E E '
counted as boluw: E l l I E
Input selector i E I E
«~---~ WWW-w» -+~
fiB( 0 - J
' 'l
I I
l I

3. BIAS CURRENT ADJUSTMENT (SeeTop View on Page 5)

Note:

1. Room Temperature l8°C ~ 28°C 3. Before turning ON POWER switch, turn kVRl on F3728
2 For adjustment, run the unit for more than 3 minutes after fully counterclockwise.

the power is switched on.

STEP SUBJECT MEASURE OUTPUT ADJUST ADJUST FOR REMARKS
l. LaCH Connect DC volt meter between kVRl (L-CH) DC 3mV This bias current adJustmenl converts
emitters of kQ7, km; on F-3728 F-3728 current value into voltage by ohms
law.
2, R-CH Same as above kVRl (R~CH) DC 3mV
F-3728