Sansui AU 417 Service Manual

Page 1

SERVICE MANUAL

INTEGRATED STEREO AMPLIFIER

SANSUI All-417

SANSUI ELECTRIC CO., LTD.

SPECIFICATIONS

iner output
Min. RMS, hoih channels driven, mm 20 lo 20,000 Hz, with
no more than 0.02 % tolaI harmonic distortion
65 warm perchannel into 8 ohms
Load impedance ..... 8 ohms
Total harmonic distnniofl
.......... . . . less than 0.02 % at m below med
min. RMS power output
Intermodulallun distortion (70 Hz : 7 kHz = 4:l SMPTE meIhoa)
............. less than 0I02 % at or below rated
Iain. RMS powcr oquut
Frequency response la: 1 watt)
..II 5 to 100,000 H1 it: as ~3 as
Damping factor (1 kHz, both channels drivtn)
............. 60 into 8 ohms
RIAA curve deviation (PHONO 20 Hz to 20 kHz)
+01 as 70. 2 dB
Input sens vity and impedancz (1 kHz, for rated power uquulI
PHONE) . . I 25 mV/47 kilohms
(Max input capability 00 Inv ail kHz, inssihan o 01 %
toul harmonic distonion)
AUX, TUNER, TAPE PLAY
............ 150 mV/47 kilohms
Outpul level and impedance (1,000 Hz]
TAPE REC (pin jack}. 150 mV Into 47 kilohms/éoo ohms
Channel sepzrilion [I mm: rated power output)

PHONO ........ so as
AUX TUNER TAPE PLAY
. as as
Hum ma noise (shun-circuit, A nethrkI
PHONO . . , I so an
AUX, TUNER, TAPE PLAY
............ we as
Contmls
BASS . I. :IOdEISO Hz)
TREBLE . tioaelismzl
sussomc , . «3 as (16 Hz). édB/ocx

LOUDNESS (VOLUME control: -30 as position]
............ 9 as a! 50 Hz
7 as at \0 kHz
inér requirements
Power voltage ..... mo, 120,220,240 v (50/60 Hz)
For U.S,A, a Canada
............ no v (50 Hz)
Powu consumption
Maximum consumption
....... I 300 watts
Rated consumption
200 watts 240 VA
430 mm (Is-i 5/15") w
iss mm Isis/8) H
395 mm (1 5-9/l6") D
Wcighx ........... 12.2 kg (26.9 lbs) nu
14.3 kg (31.5 lbs) packzd

Dimensmns

- Design and specifications subject to changes without noticc
fur impvmmems,

Page 2

U-417

1. BLOCK DIAGRAM

h

PHONO I
PHONO 2
TUNER

AUX

REC C
TAPE r:

REC @-
TAPE 2[

EQUALIZER AMP

Input Selector

C
C

PLAY C

PLAV @-

Il Tape Plu y

:D-o\o-

Loudness

Balance Volume

POWER

TONE CONTROL AMP

Tone. Control

POWER AMP

1' Subsnric
/ Filler

Treble
J.

E

'l'

Buss

---0

TNT

TRANSFORMER POWER SUPPLY

ENE

7

-.

PROTECTOR

Speakers
Syslem A

Sysem 8

-'\l
Headphone

_.+

2. ADJUSTMENTS

2-1. Driver Circuit Board Adjustments (See the picture of top view on page 7.)

Note: 1. Master Volume . . . . L . Minimum 3. For adjustment, run the unit for more than 3 minutes
2. Room Temperature ...... 18°C ~ 28°C after the power ls swltched on. _
STEP SUBJECT EQUIPMENT MEASURE OUTPUT ADJUST ADJUST FOR REMARKS
1. DC 0V DC Volt Meter Speaker Terminal F-2721 VRO] DC 0V :5 mV
L-CH
2. DC 0V Same as above Same as above F-2722 VROl DC 0V :5 mV
R-CH
3. Bias Current Same asabove TP Terminal (+) (-) F-2721 VR03 DC 20 mV 11 mV 0 By turning VR03 counterclock- ,
L-CH of F-2721 wise, the bias current is de-
creased gradually.
4. Bias Current Same as above TP Terminal (+) (-) F-2722 VR03 DC 20 mV :1 mV
R-CH of F-2722