Sansui AU-919 Service Manual

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1. BLOCK DIAGRAM
„—
Input Selector (S0le~g) F-2835
DEE MAA LA -
i Î
i MC HEAD AMP ! Í Bann Jump_F-2846 ________ |
!
nn ; F- 2838
1 F-2834 | Tone Defeat ; | Pre - Power
| | м em 7 Subsonic CONNECTED
| | Piay2 Muting ! Filter SEPARATED
wm u
| | Power Amp IN
| PHONO-2 @ I _ Treble} |
Г ММ | Balance Volume : | L
| |, - Г) | |
| |
! = L | PRE-OUT |
сах @— > 6 во TO |
| | : (9 & |
| | Tone Control | |
| TUNER (Où — [Tone Selector) |
| | |
в | | |
oh | | | r
| | POWER STAGE
‚ po PLAY OF
|
TAPE -! | |
|
REC (Ry. o e Торе Сору | |
| F- 2839
es | ,
. | Griver Amp
(DD/DC Circuit)
|
D
m
I
—
Q
$--———
Relay
ae: O
epeoker [12 System A (direct)
to
Г Speaker Terminal
[1 ol System B
RE sion
LA
to Head Amp ‚2844 8 —-- to Power Stage
8 Flat Amp =) Power Supply Power Supply rt
| |
|
Power SW
и Е
Power Transformer Power Transformer
GN
2. CIRCUIT DESCRIPTION
2-1. MC Head Amp and Phono Equalization Circuit
Г DC Equalizer AMP
(F-28635)
MC HEAD AMP (F-2833)
Diamond Differential Crreurt(DD DC)
D
ee
Re a
Bolance Adjust $ Center DC $
(THO. MIN) OV Adjust а, твое ›
Cascode-connected
Bootstrap Circuit
oe ee о. 40V
¡S2Ómv/ 20011
Output
Se
№ |
i. pm ao
Darlington SEPP Circuit
> |
| = À Constant. | ay
wur 7 Carrent £
e 2 .6nv/a7kQ Circuit a 1
PHONO 2 (MM} a i . + + + +
L- CH, Le ano al еее eo pee ee
PHONO i (MM /MC] Differential Input Crrcuit coe à pr
C.'nV/:0N (MC: . _ with cascode-connected bootstrap
Sa 5 hone Me and constant current circurt L Ab + ir L
3. Phono-1 MM Equalizer Circust( RIAA)
e MC Head Amp and Phono Equalization Circuit (Refer to
Fig. 2-1)
The circuit configuration from MC head Amp to output of power
amp stage used in AU-919 is a fully Push-pull DC amp with direct
coupled input-capacitor-less DC amplifier. In order to ignore time
constant with lagging or leading phase caused by input capacitor,
FET input circuits are employed. By this, higher slew-rate and
low-noise factor can be obtained.
1) MC (Moving Coil) type cartridge generally requires head amp to
boost up weak signal from the stylus. The pre-amp section of
AU-919 includes this head amp and conventional phono equalizer
circuit for MM (Moving Magnet) type cartridge. MC type cartridge
provideshigh frequency performance and excellent tonal quality,
but as its output voltage from stylus is as low as approx. 0.1mV,
the MC head amp or step-up transformer is needed as mentioned
above. To ensure the outstanding performance in tone quality
and signal-to-noise ratio(S/N),. AU-919 employs the head amp
which meets with these reqirements.
The circuit configuration of MC head amp in AU-919 is input-
capacitor-less (ICL) direct coupled complementary circuit using
low-noise and high gm FETs of P-ch and N-ch in parallel connec-
tion on both channels. The requirements of MC head amp are to
provide a enough S/N ratio and gain to connect the MC head
amp to conventional phono equalizer. (approximately 28dB for
MC cartridge with output impedance, 10 ohms). As high gm can
be obtained equivalently by connecting low-noise & high gm
FET in parallel, remarkable S/N ratio and gain(gm) can be
obtained.
* The relation between noise and gm of FET is indicated as shown
below.
ет =4/4 К. Т. В. К
em = Noise voltage
K =Bolzman constant
T = Absolute temperature
B =Band width
R =Channel resistance of FET
(= 1/gm)
—
AU-919
AU-919
Channel resistance R of FET is equal to 1/gm. By this, when
FETs are connected in parallel, the total gm becomes higher and
S/N ratio is excessively improved.
On AU-919, —154dB of total noise level under equivalent
input is obtained. The circuit as shown in Fig. 2-1 uses ICL
construction with total six low-noise Dual-FETs per channel (in
case of using rank K2 of the FET) in parallel push-pull connection,
and Diamond differential DC(DD/DC) circuit with fully push-pull
trasistor in output stage of the pre-amp section. |
Phono equalizer circuit is input-capacitor-less (ICL) direct couple
DC equalizer amp employing DD/DC circuit. The output imped-
ance on this circuit is as low as 200 ohms, S/N ratio better than
90dB and the deviation of RIAA equalization curve within + 0.2%.
In addition, the slew rate of the equalization circuit itself is
excessively high, 200V/usec.
The circuit configuration of pre-amp section as shown in Fig. 2-1
is that the first stage is differential input circuit of Dual-FET with
cascode-connected bootstrap, and high performance constant
current circuit to avoid tonal coloration, phase shift and external
noise, and second and third stage include DD/DC circuit with
high driving capability. The output stage is composed of Darl-
ington-connected SEPP circuit.
The features of the constant current circuit and the bootstrap
cirucit are simply explained below, description of DD/DC
circuit is on the next page.
Constant Current Circuit
Common mode rejection ratio and power supply rejection ratio,
as an advantage of differential amplifier, can be more improved
by adding the constant current circuit.
Cascode bootstrap circuit
This circuit allows the following features as differential amplifier
using low-noise Dual-FET.
1. Gate leak current is almost ignored by making voltage between
Drain and Source of FET low.
2. As mirror effect is decreased, the frequency response of high
range is more extended.
3. The distortion caused by voltage dependance of negative feed-
back capacitance is decreased.
4. Linear response can be highly improved.
2-2. Operation and Features of Diamond Differential DC(DD/DC) Circuit
Fig. 2-2 О en
| Pre Drive Circuit
+53\ | . (Differential Push-Pulı Drive]
| (Oy) 3!
3 52\_ $ 52 a, 32V Pure Complementary
| | TRO3 | Power Drive Circuit
am + TRos Re à > + +56V
] y \ 3.5V |
e | y 1 4
$ ; a, A TR25
| LIV yA | yA TR a
— ~ - > A 9 E TR7O A TR7O5
wal —" | A | |
$ , ' $ 2 TR09 Bias +- L
= Y y T : ‘vi Y Current & > $ >
| | Volume À | TR23 7 la
y 2 4
[ola + — = > LH cup!
|
input rn ! ЗА, ча | $ t 4
| TRI3 | > > >
IRA ogy — yA A Y
| | ne ТВ» |
Ay 31 |
o a TRe TR703 TR707
Center DC _40y | Y Las
OV Volume | т.— a | 56
- 40.6V wr | NET TRi7 TR2ı | Spy 4 Ré — 56\
_ _
TRoı Же | Lay N |
_ 53 | ? IA
Constant Current L---- - - -- ----- --- -
Circuit Diamond Differential
Circuit |
KL
un
e Operation and Features of Diamond Differetial
DC(DD/DC) Circuit (Refer to Fig. 2-2)
1. Features
1) The DD/DC circuit has been developed based on Sansui's latest
electronic technology and our sound policy which have been
living in our tradition since a series of Sansui AU-517 & AU-717.
That is, the performance of this AU-D919 is positively pursued
and improved in dynamic characteristics as well as in static
characteristics.
2) By improving open-loop characteristics to perform NFB properly
and providing sufficient current margin for this circuit, TIM
(Transient Intermoduration) distortion has been able to be
reduced.
—
2. NFB and TIM distortion
As shown in Fig. 2-3, in a conventional power amplifier, an NF
signal delays due to time constant of impedance element, and is
operated with an input signal. As by this lagging, the phase of NF
signal does not coincide with that of input signal, it is not possible to
feed back the signal instantaneously containing transient components
such as music with various harmonics. As a result, it brings TIM
distortion which the waveform of output signal clips instantaneously.
For this reason, the input signal can not be purely amplified and
distortion is incurred.
Fig. 2-3
JL
| Filter} Stage
step input
Taking into consideration on TIM distortion and NFB, they are
essential for enhancement of better sound quality in dynamic
Characteristics, also NFB is very effective for following points.
1) Improvement of non-linear distortion.
2) Stabilization of gain against temperature drift, caused by current-
flows, and fluctuation of power source voltage.
3) Reduction of amplifier noise.
4) Improvement of input and output impedance.
On the other hand, Fig. 2-4 below shows the change of the required
current to provide NFB. This Fig. shows that it is necessary to
increase the required current in order to increase the NFB and that
the more open-loop characteristics becomes narrow, the more the
required current becomes large. This means that if ample cuurent
margin is not available, TIM distortion will be arised.
Fig. 2-4 of fc (Open-loop Cut-off freq.)
1
! Current required for
amplifier itself
Flat frequency characteristic
by the N.F.B.
| X Open loop gain
f(Hz)
(Frequency)
3. Prevention of TIM distortion
The prevention methods of TIM distortion are as follows:
1) To minimize NFB amount
2) To apply local feedback to the voltage amplification stage in
order to improve main feedback.
3) To apply current as much as possible into the voltage amplifica-
tion stage.
4) To connect a filter so that a tansient input signal does not enter
into the input stage beyond response of the amplifier.
To adopt an input capacitor providing lagging-phase in addition
to the conventional mirror type circuit, in order to achieve
2-pole phase compensation, and at the same time, to enhance the
stability by carrying out leading-phase compensation.
This AU-919 adopts the abovementioned methods 1) to 5), also
the DD/DC circuit is designed to achieve the subject above item 3).
As shown in Fig.2-3, when figuring out current values required for
each voltage amplification stage of the amplifier, assumig that the
most severe input (an input which is large enough to operate the
amplifier and contains infinite frequency comopnents) is applied to
the amplifier, it is found that large current is required for second
and its following stages of this section. Therefore, AU-919 includes
the DD/DC circuit to prevent annoying TIM distortion.
4. Operation of Diamond Differential DC Circuit for Large
Current Drive
* DD/DC circuit which is one of methods to prevent TIM distortion
can supply an amplifier itself with large current required.
1) Fig. 2-7 shows the fundamental circuit of DD/DC section. The
voltage differential circuit consists of TRO7 and TRO9 as well as
TR11 and TR13, On the other hand, the current differential
circuit consists of TRO7 and TR13 as well as TRO9 and TR11.
Fig. 2-5 Current Fig.2-7 Fundamental Circuit
Differential Circuit of DD/DC section
11 +Vcc +Vcc
TR19
IN+ TRO7
yA
2
NK E
IN— TR13
У TR21
il
— Усс
Fig. 2-6 Voltage
Differential Circuit
TR21
< In the above Fig.2-7,the cascode-
connected Circuit consisting of
TRO3, TROS, TR15and TR17 is
omitted.
Fig. 2-5 shows the current differential circuit.
Fig. 2-6 shows the voltage differential circuit.
In Fig. 2-7, TRO7 and TROS9 as well as TR11 andT R13 perform
voltage differential amplification under an audible signal fre-
quency band. When signals including transient or high frequency
components is applied to input in Fig. 2-5, the operation of this
stage shifts from voltage differential amplification to current
differential amplification consisting of TRO7 and TR13 as well
as of TRO9 and TR11, which let the large current flow into this
stage. Above function results the improvements o/ rise-time and
slew rate, in other word, it brings the reduction of Ti M distortion.
The detailed operation of the current differenti) circuit is as
follows:
The complementary circuit in Fig.2-5 consists of T@07 andTR13
and two input signals into these TRO7 and TR13 are anti-phase
each other, therefore, only when a transient signal including
positive (+) side component into TRO7 and nejative (—) side
into TR13 is applied to the inputs, the circuit functions and
outputs only half wave with large amount of curænt each other
from two outputs. TRO9 and TR11 perform the srnilar function
in Fig.2-7, and the output signals are out-of-phise each other
with half wave, so that TR19 and TR21 in next sage operate as
a push-pull function and large current is able to beflowed.
2
—
3. ADJUSTMENTS
Notes: 1.
2.
Level Volume
de Minimum
Room Temperature .......... 18°C ~ 28°C
(65°F ~ 83°F)
3. When replacing some parts or circuit board, refer to
description in REMARKS.
4. For this adjustment, run the unit for more than 3
minutes after the power is switched ON.
3-1. MC Head Amp (F-2833) Adjustment (See Fig. 3-1 & 3-4)
STEP SUBJECT MEASURE OUTPUT ADJUST ADJUST FOR REMARKS
1 Voltage Adj. Between chassis (GND) and one of VRO3 (L-ch) | +10V +1V Before turning ON power switch, set
L-ch + side Drains of FETO1, FETO3, FETOS, F-2833 VRO1, VRO5, VRO3 (R-ch) and
FETO7, FETO9, FET11 (between VRO4, VRO6, VRO2 (L-ch) to
GND and (A) in Fig. a center position.
Each Drain of all FETs (2SK163)
commonly connected.
2 R-ch + side Between chassis (GND) and one of VRO4 (R-ch)
Drains of FETO2, FETO4, FETO6, F-2833
FETO8, FET10, FET12 (between
GND and (B) in Fig. 3-1)
3 L-ch — side Between chassis (GND) and one of VROS (L-ch)
Drains of FET13, FET15, FET17, F-2833 —10V 11V
FET19, FET21, FET23 (between
GND and ©) in Fig. +1)
Each Drain of all FETs (25J44)
commonly connected.
4 R-ch — side Between chassis (GND) and one of VRO6 (R-ch)
Drains of FET14, FET16, FET18, F-2833
FET20, FET22, FET24 (between
GND and (0) in Fig. 3-1)
5 Balance adj. in VRO1 (L-ch) Minimum e Feed sine-wave signal, 1 kHz to
case of using VRO2 (R-ch) | distortion PHONO-1
distortion meter F-2833 e Refer to notes below.
Notes: Balance adj. in step 5 with distortion meter
1) Feed sine-wave signal, 1 kHz to PHONO-1.
2) Connect distortion meter to TAPE-REC input terminal and set output level of TAPE-REC to 20 volts
by adjusting audio oscillator output.
3) Add 10 ohms, 1/4W, across output terminal of audio oscillator to have impedance matching.
Balance adj. without distortion meter
1) VRO1 Set VRO1 to 2/3 position from max. point.
2) VRO2 Set VRO2 to 2/3 position from min. point.
3-2. Equalizer (F-2835) Adjustment (See Fig. 3-2)
3-4. Driver Circuit (F-2839) Adjustment (See Fig. 3-3/3-4)
STEP SUBJECT MEASURE OUTPUT ADJUST ADJUST FOR REMARKS
1 DC OV Adj. Speaker terminal (L-CH) VRO1 (L-ch) DCOVi5mV Before turning ON power switch, set
(see Fig. 3-3) F-2839 VRO1 & VRO2 to center position.
2 DC OV Adj. Speaker terminal (R-ch) VRO2 (R-ch)
(see Fig. 3-3) F-2839
3 Bias current Between emitters of power VRO3 (L-ch) | DC20mV+1mV | e Before turning ON power switch,
Adi. transistors, TR707 & TR705 F-2839 turn VRO3 & VRO4 fully counter-
(between (G) & (W in Fig. 3-4) clockwise.
This bias current adjustment con-
4 Bias current Between emitters of power VRO4 (R-ch) verts current value into voltage
Adj. transistors, TR706 & TR708 F-2839 by Ohm’s law.
(between(1) & in Fig. 3-4)
Fig. 3-1 F-2833 MC Head Amp Circuit Board (Component side)
Volt-meter
y
N е
+
ro |
HH
=
< 2 <
2. | x
3/2 2
® > <
5 ‘> O
: O D
¿Mm
© 2
© о
2 N
Des © eee
o. o. 5 SGD
OG S 2 eee
BGs #50
e2s L-ch Ss 6D
eee
.0 ee SG
DGS 33?
e e FET14 S G D
ос $ FETO2 8 oe e
SGD
(B)
(A)
se 2 FET13 FETO12 2 $
ee @ о
ос $ ооо
DES R-ch ео
28:8 228
DGS 2m SGD
=> 5
а о
> <
0}
80°
F-2833 > |2 3
23 8 |
uo
STEP SUBJECT MEASURE OUTPUT ADJUST ADJUST FOR REMARKS
1 DCOV Adj. Between GND & common joint of VRO1 (L-ch) DC OV +50 mV Before turning ON power switch, set
R67, R69 (between GND and (©) F-2835 VRO1 & VRO2 to center position.
2 DCOV Adj. Between GND & common joint of VRO2 (R-ch)
R68, R70 F-2835
3-3. Flat Amp (F-2841) Adjustment (See Fig. 3-5)
3 STEP SUBJECT MEASURE OUTPUT ADJUST ADJUST FOR REMARKS
1 DCOV Adj. Between GND & TEST POINT VRO1 (L-ch) DCOV +10 mV Before turning ON power switch, set
from emitter of TR13 through F-2841 VRO1 & VRO2 to center position.
R43
(TEST POINT between @ & ©
in Fig. 3-5)
2 DCOV Adj. Between GND & TEST POINT VRO2 (R-ch)
from emitter of TR14 through R44 | F-2841
(TEST POINT between ® & ©
in Fig. 3-5)
Fig. 3-3 SPEAKER TERMINAL Fig. 3-4
— 18. 2-
|
a — +
volt meter 4% volt meter (>
(DC 0V adj.)
e Notes when replacing FETs on F-2833 РМС
There are six kinds of FET, ranks 2SK163
(Р type) and 2SJ44(N type) on F-2833, MC L-ch
Head Amp Circuit Board. When replacing | TR707
some of FETs, use same rank of the 2SK163 NMA1012
and 2SJ44 as a pair per one channel. Also,
total quantities of FETs per one channel are
determined depending upon the respective TR708
FET ranks having slightly different gain (gm). | NMA1012
e Total quantities of 25K163 and 2SJ44 per Rch
one channel due to different ranks _TR706 2
Ran-|E TL QTY Stock No. (28K 163)
kings| Per one | 25K163 25] 44 Чо ie Fig. 3-5
channel | (P type) (N type) Г/
K2 6 0370341 0370331
L1 5 0370342 0370332
L2 5 0370343 | 0370333 test points НА
M1 4 0370344 0370334
M2 4 0370345 | 0370335 F-2841
м| 3 | 0370346 | 0370336 Flat Amp
Circuit Board
Fig. 3-2 F-2835 Equalizer Amp Circuit Board
Volt-meter
(Component side)
_
|
Heat Sink | о]
A
R70 ‘F) R68 R67
VRO2 VRO1 |
(7)
(a) @)
DC OV Adj
F-2835
_
VW Rear Side
=" ¥RO1(DC OV Adj.)
3(Bigs Current Adj.)
meter»
J2(DC OV Adj.)
Current Adj.)
4. PARTS LOCATION & PARTS LIST
4-1. F-2839 Driver Amp Circuit Board
Conductor Side
(Stock No. 7571991)
AU-919
AU-919
Since some of capacitors and resistors are
omitted from parts lists in this Service
Manual, refer to the Common Parts List for
capacitors & resistors which was appended
previously to each Sansui Manual.
A
Parts List
Parts No. Stock No. Description Position
eTransistors
TRO1,02 0306680, 1 25C2071 B,V 1A.1D
TRO3,04 +-0306740, 1 2SC1845 E,U 1B.1C
TROS, 06 0306740, 1 25C1845 E,U 1B.1C
TRO7,08 0306740, 1 25C1845 E,U 1B.1C
TROY, 10 0306740, 1 2SC1845 E,U 1B.1C
1R11,12 0301090, 1 25A992 E, U 1A.1D
TR13, 14 0301090, 1 25A992 E,U 1А.10
ТА 15, 16 0301090, 1 2SA992 Е, Ц 1A.1D
TR17,18 0301090, 1 25A992 E,U 1A.1D
TR19, 20 030 1030, 1 2SA939 B,V 1B.1C
TR21,22 0306680, 1 25C2071 B,V 1A.1D
TR23, 24 0306740, 1 25C1845 E,U 1A,B.2D
TR25, 26 0306680, 1 2SC2071 B,V 2B.2C
TR27,28 030 1030, 1 2SA939 2A.2D
TR29,30 0308441 ,2,3 25D382 M,L,K 2B.2C
TR31, 32 0303271,2,3 2SB537 M,L,K 2A.2D
TR33,34 0306740, 1 2SC1845 E,U 2B.2C
eFET
FETO1,02 0370310, 1 25K129 K,L 1B.1C
eVaristors
D 01,02 0340170 MV-103 1B.1C
D 03,04 0340170 MV-103 1B.1C
D 15,16 0340150 MV-12 1B.1C
eDiodes
D 05,06 0310480 SV-03 1B.1C
D 07,08 0310480 SV-03 1A.1D
D 09,10 0310350 1002 (152227) 2B.2C
D 11,12 0310350 10D2 (152227) 2A.2D
D 13,14 0310400 1N34A 1B.1C
D 17,18 0311160 152473D 2B.2C
Parts No. Stock No. Description Position Parts No. Stock No. Description Position
eZener Diodes R 03,04 0280391 3902 1/3W CR. 1B.1C
ZD01,02 0317190 RD-27F B 1B.1C R 05,06 0212152 1.5kQ 2W NAR. 1B.1C
2003, 04 0316310 RD13E B 1A.1D R 07,08 0280392 39kA 1/3W С.В. 1B.1C
R 09,10 0280392 39k9 1/3W CR. 1B.1C
C 01,02 0516471 470u4F 63V E.C. 2B.2C R 11,12 0280471 4702 1/3W C.R. 1B.1C
C 03,04 0516471 470u4F 63V E.C. 2A.2D R 13,14 0280390 392 1/3W C.R. 18.10
C 05,06 0622101 100pF 125V P.C. 1B.1C R 15,16 0280560 562 1/3W C.R. 1A.1D
C 07,08 0515479 4.74F 50V EC. 1B.1C R 17,18 0280560 56N 1/3W CR. 1A.1D
C 09,10 0680037 0.0334F 100V M.C. 1B.1C R 19, 20 0210152 1.5kQ 1/2W N.I.R. 1A.1D
C 11,12 0622681 680pF 125V P.C. 1B.1C R 21,22 0280391 3902 1/3W CR. 1A.1D
C 13,14 0515479 4. 7uF 50V EC. 1B.1C R 23,24 0280392 39k 1/3W CR. 1A.1D
C 15,16 0680037 0.033uF 100V M.C. 1B.1C R 25, 26 0280101 1002 1/3W CR. 1B.1C
C 17,18 0515470 A7uF 50V E.C. 1A.1D R 27,28 0280153 15kQ 1/3W CR. 1A.1D
C 19,20 0516339 3.3uF 63V E.C. 2A.2D R 31,32 0280101 1002 1/3W CR. 1A.1D
C 23,24 0623309 3pF 125V P.C. 1B.1C R 33,34 0280821 8202 1/3W CR. 1B.1C
C 25,26 0623309 SpF 125V P.C. 1A.1D R 35,36 0280821 8202 1/3W CR. 1B.1C
C 29,30 0623220 22pF 125V P.C. 1B.1C R 37,38 0280101 1002 1/3W CR. 1B.1C
C 31, 32 0280041 0.047u4F 100V M.C. 2A.2D R 39,40 0280101 1008N 1/3W С.В. 1B.1C
C 33, 34 0515109 1uF 50V E.C. 2A.2D R 41,42 0280151 150Q 1/3W CR. 1B.1C
С 35, 36 0680001 0.0014F 100V M.C. 2B.2C R 43,44 0280151 1502 1/3W C.R. 1B.1C
C 37, 38 0680001 0.001uF 100V MC. 2A.2D R 45,46 0280100 102 1/3W C.R. 1A,B.1D
C 39,40 0623330 33pF 125V P.C. 2B.2C R 47,48 0280151 1508 1/3W CR. 1A.1D
C 41,42 0623330 33pF 125V P.C. 2A.2D R 49, 50 0280151 1502 1/3W C.R. 1A.1D
C 43,44 0680041 0.047uF 100V P.C. 2B.2C R 51,52 0280101 1002 1/3W C.R. 1A.1D
C 45,46 0516339 3.3uF 63V E.C. 2B.2C R 53,54 0280101 1002 1/3W CR. 1A.1D
C 47,48 0680001 0.001 uF 100V P.C. 1В.1С R 55, 56 0280821 8202 1/3W CR. 1A.1D
C 49,50 0680001 0.001uF 100V P.C. 2B.2C R 57,58 0280821 8202 1/3W CR. 1A.1D
C 53,54 0623309 3pF 125V P.C. 1B.1C R 61,62 0280393 39kN 1/3W C.R. 1B.1C
C 55,56 0623309 3pF 125V P.C. 1A.1D R 63,64 0280393 39kQ 1/3W CR. 1A.1D
C 57,58 0681018 O.22uF 400V M.C. 2B.2C R 67,68 0280103 10kQ 1/3W CR. 1A.1D
C 59,60 0681018 0.22uF 400V M.C. 2A.2D R 69,70 0280121 1208 1/3W CR. 18.1C
C 61,62 0514101 100uF 35V E.C. 1B.1C R 71,72 0280562 5.6k2 1/3W CR. 1A.1D
R 73,74 0280102 1kQ 1/3W CR. 1A.1D
R 01,02 0280563 56kN 1/3W С.В. 1B.1C R 75,76 0280121 1208 1/3W CR. 1A.1D
Parts No. Stock No. Description Position
В 77, 78 0280560 562 1/3W C.R. 18.1C
R 79,80 0280681 6802 1/3W CR. 2A.2D
R 81,82 0280391 3902 1/3W C.R. 2B.2C
R 83,84 0280391 3902 1/3W C.R. 2A.2D
R 85,86 0210561 5602 1/3W NLR. 2B.2C
R 87,88 0210561 5602 1/3W N..R. 2A.2D
R 89,90 0210470 479 1/2W N.LR. 2B.2C
R 91,92 0210470 472 1/2W М.1.В. 2A.2D
R 93,94 0210479 472 1/2W NR. 2B.2C
R 95,96 0210479 4.7 1/2W N.LR. 2B.2C
R 97,98 0210479 4.72 1/2W N.LR. 2A.2D
R 99,100 0210479 4.7 1/2W NER. 2A.2D
R 101,102 0212100 1092 2W N.ER. 2B.2C
R 103, 104 0212109 12 2W NAR. 2B.2D
R 105,106 0280822 8.2k2 1/3W C.R. 1B.1C
R 107,108 0280562 5.6k2 1/3W CR. 18.1C,D
R 109,110 0280393 39kN 1/3W C.R. 1B.1C
R 111,112 0280104 100k2 1/3W C.R. 2B.2C
R 113,114 0280680 68N 1/3W CR. 2B.2C
R 115,116 0280823 82k9 1/3W CR. 2B.2C
R 117,118 0280222 2.2kA 1/3W CR. 2B.2C
L 01,02 4290370 1uH 2A.1D
VRO1, 02 1033570 Volume, 1009 (B) 1A.1D
(Center DC OV Adjust)
VRO3, 04 1033630 Volume, 1kQ (B) 1A.1D
(Bias Current Adjust)
2411560 3P Connector
4-2. F-2833 MC Head Amp Circuit Board
Conductor Side
(Stock No. 7610321)
Parts List
Parts No. Stock No. Description Position
eTransistors
TRO1, 02 0306071, 2 2SC1313 G,H 1B.4B
TRO3,04 0300470, 1 2SA726(W) F,G 1A.4A
eFET
FETO1 - 12 0370341 -6 2SK163
K2,1L1,1L2,M1,M2,NI 2,3A
FET13 ~ 24 0370331 ~6 2SJ44
K2,L1,L2,M1,M2,N1 1,2,3,4A
C 01,02 680001 0.001uF 100V P.C. 2B.3B
C 03,04 0513101 100u4F 25V E.C. 1A.4A
C 05,06 0513101 1004F 25V E.C. 2A.3A
C 07,08 0602109 1uF 100V MC. 1А.4А
С 09,10 0602109 luF 100V MC. 1A.4A
C 11,12 0515100 10u4F 50V E.C. 1А.4А
С 13,14 0515100 104F 50V E.C. 1A.4A
C 15,16 0623101 100pF 125V P.C. 1B.4B
C 17,18 0623101 100pF 125V P.C. 1A.4A
C 19,20 0622102 1000pF 125V P.C. 2A.3A
R 01 -08 0280229 2.20. 1/3W CR. 2B.3B
R 13-24 0280229 2.22 1/3W CR. 1,2,3,4B
R 25,26 0212471 4702 2W NAR. 1B.4B
R 27,28 0212471 4702 2W N.I.R, 1A.4A
R 29,30 0280271 2702 1/3W C.R. 2A.3A
R 31,32 0280332 3.3k2 1/3W С.В. 1А.4А, В
В 33,34 0280330 338 1/3W CR. 1B.4B
R 35,36 0280101 1002 1/3W C.R. 1A.4A
R 37,38 0280223 22k2 1/3W C.R. 2A.3A
В 39,40 0280330 332 1/3W CR. 2B.3B
R 41,42 0280109 192 1/3W CR. 2A.3A
R 43,44 0280109 19 1/3W CR. 2A.3A
R 45,46 0280820 822 1/3W CR. 2A.3A
R 47,48 0280103 10Kn 1/3W C.R. 1B.4B
R 49, 50 0280103 10kQ 1/3W CR. 1B.4B
R 53,54 0280390 392 1/3W С.В.
R 55,56 0280221 2202 1/3W CR.
VRO1,02 1033590 Volume, 2208 (B) 18.4B
(Balance Adjust)
VRO3 - 06 1035400 Volume, 33k (B) 1,4B
(Voltage Regulator Adjust)
4-3. F-2835 Equalizer Amp Circuit Board (Stock No. 7551331)
Conductor Side
4-4. F-2845 Power Supply Circuit Board for power amp section (Stock No. 7503011)
Conductor Side
Parts List
Parts No. Stock No. Description Position Parts No. Stock No. Description Position
eTransistors C 601 0606108 O luF 250V MC. B
TRO1,02 0308611,2 2SD357 D,E А.С
TRO3,04 0303441,2 2SB527 D,E AC R 01,02 0212332 3.3KN 2W NIR. B
R 03,04 0212332 3.3kQ 2W NLR. AC
@ Diodes R 05,06 0280153 15kQ 1/3W ER. A.C
D 01,02 0311290 SS-3 B R 07,08 0280563 56k2 1/3W CR. AC
D 03,04 0311300 SS-3R A.C R 09,10 0280563 56kQ2 1/3W CR. А.С
D 05,06 0311700 RB-152 B R 11,12 0280153 15kQ 1/3W CR. B
R 13,14 0210100 100 1/2W NIR. A.C
C 01,02 0606108 0.14F 250V M.C. A.C R 15,16 0210100 102 1/2W NLR. B
C 03,04 0681001 0.47uF 250V MC. А, В.В, С R 17,18 0210100 102 1/2W NIR. A
C 05,06 0681001 0.474F 250V M.C. AC R 19,20 0210100 102 1/2W NIR. A.C
C 15,16 0516221 220uF 63V E.C. А.С
С 17,18 0516221 220uV 63V E.C. А.С
4-5. F-2840 Protector Circuit Board (Stock No. 7596631)
Conductor Side
LV =
Г
Parts List
Parts No. Stock No. Description Position Parts No. Stock No. Description Position Parts No. Stock No. Description Position
@ Transistors C 23,24 0623909 9pF 125V P.C. 1C.2C R 37.38 0280181 1802 1/3W CR. 1C.2C
TRO1,02 0306740,1 2SC1845 E,U 1C.2C C 25,26 0515109 luF 50OV EC. 1D.2D R 39,40 0280680 68N 1/3W CR. 1C.2C 1
TRO3,04 0306740,1 2SC1845 E,U 1C.2C C 27,28 0680041 OO47uF 100V MC. 1D.2D R 41,42 0280181 1802 1/3W CR. 1C.2C 4
TRO5,06 0301090,1 2SA992 E,U 1C.2C С 29,30 0680001 0.001uF 100V MC. 1D.20 В 43 44 0280181 1802 1/3W CR. 1C.2C
TRO7,08 0306680,1 2SC2071 B,V 1C.2C C 31,32 0680001 0.0014F 100V M.C. 1D.2D В 45 46 0280821 8202 1/3W CR. 1C.2C
ТА09, 10 0306740, 1 25C1845 E,U 1C.2C C 33,34 0623220 22pF 125V Р.С. 1D.2D R 47,48 0280821 8208 1/3W CR. 1C.2C
TR11,12 03067401 2SC1845 E,U 1C.2C C 35,36 0623220 22рЕ 125\ Р.С. 10.20 В 49 50 0280121 1202 1/3W CR. 1D2D
ТА13, 14 0301090, 1 25A992 E,U 1C.2C C 37,38 0682023 0.033uF 100V M.C. 1C.2C R 51,52 0280393 зака 1/3W CR. 1D2D
TR15, 16 0301090, 1 2SA992 E,U 1C.2C C 39,40 0622202 2000рЕ 125\ Р.С. 1C.2C R 53,54 0280393 39kN 1/3W CR. 1020
1817,18 0301090,1 2SA992 E,U 10.20 C 41,42 0682037 0.12uF 100V MC. 1C.2C В 55 56 0280331 3302 1/3W CR. 1D 2D
TR19,20 0306740,1 2SC1845 E,U 1D.2D C 43,44 0681001 0.474F 100V MC. 10.20 В 57 58 0280121 1202 1/3W CR. 1D 20
TR21,22 0306740.1 2SC1845 E,U 1D.2D C 45,46 0680013 0.0033uF 100V M.C. 1C.2C R 59.60 0280391 3908 1/3W CR. 1D 2D
TR23,24 0301090,1 2SA992 E,U 1D.2D С 47.48 0515331 3304F 50V E.C. 1D. R 61 62 0280391 3902 1/3W CR. 1D 2D
TR25,26 0306680,1 2SC2071 B,V 1D.2D С 49,50 0515331 3304F 50V E.C. 1D.2D В 63 64 0280331 3302 1/3W CR 10.20
TR27,28 03010301 2SA939 B,V 10.20 С 51.52 0681001 0.47иЕ 250\ М.С. 10.20 Я 65 66 0280331 3302 1/3W CR. 1D 2D 2
TR101,102 0306290,1 2SC1400(1) E,U 2B С 53.54 0681001 0.47uF 250\ М.С. 10.20 В 67 68 0210330 339 1/2W NLR. 1D 20
TR103, 104 0300890,1 2SA750(3) E,U 2A.2B C 55,56 0514101 1004F 35V E.C. 1D.2D В 69 70 0210330 339 1/2W NLR. 1D2D
TR105, 106 0308611,2 2SD357 D,E 2A, B.2A C 57,58 0514101 1004F 35V E.C. 1D.2D Я 71 72 0280470 472 1/3W CR. 1020
TR107,108 03034412 2SB527 D,E 2A.2B C 105, 106 0514221 220uF 35V EC. 2A В 73 74 0231203 OK O 1/2W MR. 1020
C 107,108 0514221 2204F 35V E.C. 2A
Es © 107.708 0001021 Me МЕ N QU Gok a С y
FETO1,02 0370860 25K146Y 10.20 C 709,710 0681021 luF 250V MC. R 79,80 0231391 3902 1/2W MR. 1C.2C
eVaristors A 01.02 0280104 look 1/30 R 81,82 0231470 478 1/2W MR. 1C.2C Parts List
D 03/04 oa 2 MY tos Noe R 03, 04 0280470 478 raw CR. 16.26 o BS. 86 0280104 a IR. 1670 Parts No. Stock No. Description Position Parts No. Stock No. Description Position Parts No. Stock No. Description Position
D 05,06 0340170 MV-103 10.20 05,06 0210102 1.0k0 1/24 N..R. 10.20 R 87,88 0280331 3302 1/3W С.В. eTransistors D 607 0311160 1524730 В 604 0280393 KA 1/3W CR. 1B
R 07,08 0280182 1.8k2 1/3W CR. 1C.2C R 89,90 0280104 100kQ 1/3W CR. 1A ТВ 601 0308611 2 250357 ОЕ 1B D 608 0310340 1001 R 605 0280104 NOOR VW ARR 1A
© Diodes R 09.10 0280182 1.8kQ 1/3W CR. 1C.2C R 101,102 0280822 8.2k2 1/3W С.В. 2B TR602 0305951 2 2SC945 Q P 18 R 606 0281472 Ark INTRO
2001,02 0316530 RD27E B 1C.2C R 11,12 0280470 478 1/3W CR. 1C.2C R 103,104 0380822 8.2kA 1/3W CR. 2B TR603 03059512 256945 ОР 1А eVaristor A : W `В.
Я 13,14 0280229 2.29 1/3\ CR. 1C.2C R 105, 106 0211101 1002 1W N.LR, 28 TR604 0308521.2 2$0438 Е.Е 1A D 601 0340150 MV-12 18 607 0280333 Ko USW CR. 1A
C 01,02 0622151 150рЕ 125\ Р.С. 1C.2C В 15,16 0280229 2.22 1/3W CR. 1C.2C R 107,108 0211101 1008 1W N.LR. 2A, B.2B TR605 0305951 2 2SC045 OP 14 R 608 0280102 1kQ 1/3W CR. 1A
С 03,04 0623220 22рЕ 125\ Р.С. 1C.2C R 17,18 0280333 33k9N2 1/3W C.R. 1C.2C | TR606 0305951 2 2SC945 QP 1 2A eZener Diodes R 609 0280333 3x0 1/3W CR. 1A
C 05,06 0515330 33uF 50V E.C. 1C.2C R 19,20 0280101 1002 1/3W C.R. 1C.2C VRO1.02 1034170 1 2202 (B) Volume 1020 TR607 030801 2 230048 OP IR 2D601 0316510 RD24E B 1B R 610 0280104 100k2 1/3WCR- 2A
С 07,08 0680014 3600рЕ 125\ М.С. 1C.2C R 21,22 0280101 1002 1/3W C.R. 1C.2C (DC OV Adjust) 20602 0316390 RD6.2E B 1A R 611 0280104 100k2 1/3W CR . 2A
C 09,10 0515109 IuF 50V E.C. 1C.2C R 23.24 0280103 10k 82 Van С.В. 1C.2C eDiodes n 12 en nn ah CR. M
C 11,12 0515109 1uF 50V E.C. 1C.2C R 25,2 0280564 SEOKN 1/3W CR. 1C.2C i SR 601 0350020 2SF656 SCR 1A 8kQ (В.
С 13.14 0680037 O.033uF 100V MC. 1C.2C R 27.28 0280333 33kN 1/3W CR. 1C.2C $0 1104380 о ео" 18,8 D 01,02 or OBIT Iho Novena. 18 R 614 0212152 15kA 2W N.R. 1A
.C 15,16 0680037 0.033uF 100\ М.С. 1С.2С R 29,30 07210222 2.2kQ2 1/2W CR. 1C.2C 2411560 3P Connector D 03.04 0311160 1824730 18 C 01,02 0680041 0.047uF 100V MC. 2B R 615 0200102 1.0k2 1/2W 1.1. FR. 2B
C 17.18 0622102 1000pF 125V PC. 1C.2C Я 31,32 0280821 8202 Sw CR. 2411570 2 5MMP Connector 6r0311180 1315888 C 602 0602338 0.33uF 100WV M.-C. 1,2A R 616 0212152 1.5kQ 2W NiR, 2A
C 19,20 0623609 6pF 125V P.C. 1D.2D Я 33.34 0280821 820N 1/3W CR. 1D.20 2411630 10P Connector D 602.603 0311160 1324730 18 R 01.02 0280223 220 1/3W CR 281 24 R 617 0280330 332 1/3W CR.
C 21,22 0623609 6pF 125V PC. 1C.2C, D R 35,36 0280181 1809 1/3W CR. 1C.2C or 0311180 131588 A on zen NW Ci 28 R 619 0280330 3392 1W NG
D 604,605 0310340 1001 2B.2A R 601 0280474 470kQ2 1/3W CR. 1B RL601, 602 1150400 Relay 2B.2A
D 606 0311160 152473D 2A R 602 0280334 330k2 1/3W CR. 1B or 1150480
or 0311180 181588 R 603 0280104 100k2 1/3W CR. 1B or 1150490
4-6. F-2841 Flat Amp Circuit Board (Stock No. 7596641)
Conductor Side
A | В Parts No. Stock No. Description Position
eVaristors
D 07,08 0340150 MV-12 1B.2B
eZener Diodes
ZD01,02 0316240 RD-9 1A.2A
ZD03,04 0316390 RD6.2E B 1B.2B
C 01,02 0623330 33pF 125V P.C. 1A.2A
С 03,04 0622391 390pF 125V P.C. 1A.2A
C 05,06 0680049 0.14F 100V M.C. 1A.2A
C 07,08 0513221 220uF 25V E.C. 1A.2A
С 09,10 0515109 “IF 50V Е.С. 1B.2B
C 11,12 0680041 0.047u4F 100V M.C. 18.28
C 15,16 0623509 5pF 125V P.C.
C 17,18 0680061 0.334F 100V M.C. 1B.2B
C 19,20 0513101 100uF 25V E.C. 1B.2B
C 21,22 0513101 100uF 25V E.C. 1B.2B
C 23,24 0515101 100uF 50V E.C. 2A
C 25,26 0515101 1004F 50V EC. 2A
C 27,28 0680057 0.224F 100V M.C. 1A.2A
C 29,30 0680057 0.224F 100V M.C. 1A.2A
C 31,32 0623509 5pF 125V P.C. 1B.2B
С 33,34 0623509 5рЕ 125\ Р.С. 1B.2B
C 35,36 0623309 3pF 125V P.C.
C 37,38 0623309 3pF 125V PC.
R 35,36 0280272 2.7kQ 1/3W С.В. 1A.2A
R 37,38 0280273 27k2 1/3W CR. 1A.2A
R 39,40 0280820 822 1/3W CR. 1A2A
R 07,08 0280272 2.7K0 1/3W CR. 1A, B.2A
R 09,10 0280471 4702 1/3W CR. 1A.2A
В 11,12 0280220 229 1/3W С.В. 1A.2A
В 13,14 0280220 228 1/3W CR. 1А.2А
В 15,16 0280102 1k2 1/3W C.R. 1B.2B
В 17,18 0280333 33kA 1/3W С.В. 1A.2A
R 19,20 0280122 1.2k9. 1/3W CR. 1A.2A
R 21,22 0280101 1002 1/3W C.R. 1B.2B
В 23,24 0280223 22k2 1/3W CLR. 1B.2B
В 27,28 0280222 2.2kN 1/3W C.R. 1А.2А
В 29,30 0280272 2.7kQ 1/3W С.В. 1B.2B
В 31,32 0280102 1кЯ 1/3М С.В. 1B.2B
R 33,34 0280101 1002 1/3W CR. 1B.2B
В 35,36 0280272 1002 1/3W С.В. 1B.2B
R 37,38 0280223 22k2 1/3W CLR. 1B.2B
. R 39,40 0280820 82k2 1/3W CR. 1B.2B
Parts List R 41,42 0280102 1kQ 1/3W CR. 1B.2B
> о. Positi KN Descriptio Position R 43,44 0210470 472 1/2W N.LR. 1B.2B
arts No. Stock No. Description osition Parts No. Stoc O. escription В 45 46 0210470 479. 1/2W NR. 18.28
eTransistors TR13,14 0306740,1 2SC1845 E,U 18.28 R 47,48 0280223 22k2 1/3W CR. 1B.2B
TRO1.02 0306071,2 28C1313 G.H 1A2A TR15.16 0301090, 1 254992 Е Ц 1B.2B Я 49,50 0280101 1002 1/3W CR. | 1B.2B
R 4 SC1313 G,H 1A.2A eFET "
THOS. 06 0308680 1 2302071 в, У 18.28 FETO1,02 0370310,1 FET2SK129 K,L 1A2A VRO1,02 1033610 Volume, 4708 (В) 1A,B.2A,B
TRO7,08 — 03010901 2SA992 E,U 18.28 Diodes (Center DC OV Adjust)
TR09,10 0301090,1 2SA992 E,U 1B.2B D 01,02 0311160 1S2473D 1A,B.2A,B
TR11,12 0306740,1 2SC1845 E,U 1B.2B or 0311180 151588
4-7. F-2844 Power Supply Circuit Board for pre-amp section (Stock No. 7503001)
Conductor Side Parts List
spa à N Parts No. Stock No. Description Position
eTransistors
TRO1 0308501,2 2SD357 D,E 1
TRO2 0306290,1 2SC1400 (1) E,U 1
TRO3 0303331,2 2SB527 D,E 1
TRO4 0300890,1 2SA750 (3) E,U 1
TRO5 0306730,1 2SC2259 F,G 2
TRO6 0301080,1 2SA979 F,G 2
eDiode
D 01 0311700 RB-152 1
eZener Diode
ZD01 0316510 RD24E B 2
C 01 0606108 0.14F 250V P.C. 1
C 02,03 0549207 1000uF E.C. 2
С 09.10 0602228 0.0224F 100WV M.C. 2
C 11,12 0515101 100uF 50V E.C. 2
R 01,02 0210399 398 1/2W N.LR. 1
R 03,04 0280472 4.7kQ 1/3W C.R. 1
В 05,06 0210229 2.2kQ2 1/2W N.LR. 1
R 07 0280222 2.2kQ 1/3W C.R. 2
R 08 0280103 10kQ 1/3W C.R. 1
R 09 0280333 33kN 1/3W С.В. 2
R 10 0280203 20k82 1/3W C.R. 2
R 11 0280103 10kQ 1/3W CR. 1
В 12,13 0280472 4.7ка 1/3\ С.В. 2
В 14 0280163 16к@ 1/3М С.В. 2
В 15 0280243 24kQ 1/3W C.R. 2
R 16,17 0280203 20k2 1/3W C.R. 2
R 18 0280393 39kQ 1/3W C.R. 2
2410610 3P Plug Ass'y
Note: The circuit boards, F-2834, F-2846, F-2838, F-2842, F-2843, F-2837, F-2928 & F-2836 are not
supplied as the assembled, the individual parts on the circuit board, however, are provided for orders.
4-8. F-2834 Input Terminal Circuit Board
Conductor Side
Г |
Parts List
Parts No. Stock No. Description Position
R 01,02 0280105 IMN 1/3W CR. 1
R 03,04 0280105 IMQ 1/3W CR. 1
R 07,08 0280104 100kn 1/3W CR.
R 09,10 0280105 IMN 1/3W CR. 2
R 11,12 0280105 IMN 1/3W CR. 2
2200620 AP Input Terminal (TUNER, AUX)
2200630 AP Input Terminal (PHONO-1, 2)
2200650 AP input Terminal (TAPE-1, 2)
4-9. F-2838 Circuit Board between Pre £ Main amp
Conductor Side
on
4-10. F-2846 Muting, Jump, Tone Defeat Circuit Board
Conductor Side
4-11. F-2842 Tone Control Circuit Board
Conductor Side
Parts List
Parts No. Stock No. Description
С 01,02 0515100 10uF 50V E.C.
C 03,04 0515100 104 F 50V E.C,
R 01,02 0280105 IMQ 1/3W CR.
R 03,04 0280105 IMN 1/3W CR.
RLOI 1150430 Relay
S 01 1110290 Slide Switch, Con nected /Separated
2200650 4P Input Terminal
(PRE AMP, POWER AMP)
Parts List
Parts No. Stock No. Description Position
С 01,02 0680061 0.33uF 100V B
C 03,04 0680017 0.0047uF 100V M.C.
R 01,02 0280563 56kN 1/3W CR. A
R 03,04 0280682 6.8k2 1/3W CR. A
R 05,06 0280472 4. 7k8 1/3W CR. В
R 07,08 0280222 2.2kQ 1/3W CR. B
R 09,10 0280823 82KN 1/3W CR. B
R 11,12 0280100 102 1/3W С.В,
VRO1 1015170, 250k2 (M.N) Biance Volume A
S 01 1171130 Lever Switch, Miting A
S 02 1171170 Lever Switch, Jump B
S 03 1171150 Lever Switch, Tone Defeat B
S 04 1171130 Lever Switch, Sbsonic Filter В
2411570 4P Connector
Parts List
Parts No. Stock No. Description Position
C 01,02 0680051 0.12u4F 100V NC. B
C 03,04 0680058 O.24uF 100V NC. B
C 05,06 0680029 0.0154 F 100\ и _С. А
C 07,08 0680039 0.039uF 100V > C. A
C 09,10 0622302 3000pF 100V IC.
R 01,02 0280392 3.9kA 1/3W Ca. B
R 03,04 0280152 1.5k2 1/3W C2, B
R 05,06 0280101 1002 1/3W С.Е B,A
В 09,10 0280681 6809 1/3W C.R A
R 11,12 0280472 4.7k2 1/3W CA. A
R 13,14 0280471 4702 1/3W CH A
R 15,16 0280822 8.2k2 1/3W CA. B
5kQ x 2, Tone Cin trol B,A
VRO1, 02 1011170
Volume (Bass &r reble)
4-12. F-2843 Turn-over Circuit Board 4-13. F-2928 Rectifier Circuit Board
Conductor Side Conductor Side
=
А | B UTION sor continueo PROTECTION
ST FIRE HAZARD BBRAGE, QNUY WITH
5A FUSE AT 220/240V
10A FUSE AT 100/120V
30
„N
x 29
<Q
Nu
PER
00, UL |
Parts List we
Parts No. Stock No. Description Position Parts List
C 01,02 0680051 0.124F 100V M.C B oti
. . k No. t
C 03,04 0680058 O.24uF 100V MC. B Parts No Stock No Description
C 05,06 0680029 0.015uF 100V M.C. A e Diodes
C 07,08 0680038 0.036uF 100V N.C. A D 01 02 0310340 1001
C 09,10 0622302 3000pF 125V P.C. D 03 04 0310340 1001
В 01,02 0280105 I1MN 1/3W CR. A.B C 01 0606108 0 luF 250V MC.
R 03,04 0280105 1MN 1/3W C.R. B
R 05,06 0280105 1MN 1/3W C.R. A Е 01 0431220 1A 250V AC Fuse
R 07,08 0280105 IMN 1/3W CR. A F 02 0431320 104 250V AC Fuse
0432290 5A 125V AC Fuse
S 01 1131410 . Push Switch, Tone Selector A,B 0434060 10A 250V AC Fuse
F 03 0431240 2A 250V AC Fuse
4-14. F-2836 Tape Playback Circuit Board 4-15. F-2837 Tape-copy Switch Circuit Board
Parts List .
Parts List
Parts No. Stock No. Description
Parts No. Stock No. Description
$ 01 1131400 Push Switch, PLAY
2411570 2.5MMP Connector 1102750 Rotary Switch, Tape-Rec
2411590 6P Connector 2411580 5P Connector
Abbreviations
С.В. : Carbon Resistor E.C. : Electrolytic Capacitor
S.R. : Solid Resistor BP.E.C. : Bi-Polar Electrolytic
Ce.R. : Cement Resistor Capacitor
M.R. : Metal Film CC. : Ceramic Capacitor
Resistor Mi.C. : Mica Capacitor
F.R. : Fusing Resistor 0.C. : Oil Capacitor
N.I.R. : Non-Inflammable P.C. : Polystyrene Capacitor
Resistor T.C. : Tantalum Capacitor
M.C. : Mylar Capacitor
AU-919
5. OTHER PARTS
5-1. Front View
mo
TT ng
4 i \
+ ‘
! | i ;
; ; a
} : : 3
, A a, | A 1 4 e г
} oe > | : : i : A
7 LÉ e ] | Lit
5-2. Top View
AC Outlet
CO701-703
TR7O5
L-ch
TR707
R7 05
R707
R708
R7 O6
Speakers Afront side oe elector
5-3. Bottom View
Vrear side
Voltage Selector
TR7O3
Parts List (Front View)
R709,R710
Parts List (Top & Bottom View)
Parts No. Stock No. Description Parts No. Stock No. Description
5006780 Bonnet 21 3800470 Power Cord
7007961 Front Panel Ass’y 39 10600 Strain Relief Bushing
(includes Light Emitting Diode, Knob 22 2290190 Speaker Terminal
Guide, Push Switch Knob, Sansui Badge) 23 2200650 AP Input Terminal
3 5336600 Sansui Badge (PRE AMP-POWER AMP)
4 5318861 Level Volume Knob 24 2200620 4P Input Terminal (TUNER, AUX)
1090410 100kQ x 2 Level Volume 2200630 4P Input Terminal (PHONO-1, 2)
5 0319110 Light Emitting Diode 2200650 AP Input Terminal (TAPE-1,2)
6 o Selector Knob 25 2230190 Ground Terminal
1104380 Rotary Switch, Input Selector
7 (oo ove Tape Copy Knob © 2410091 Voltage Selector Plug
1102750 Rotary Switch, Tape Copy 2410830 Voltage Selector Socket
5326620 Push Switch Knob
8 (5286721 Knob Guide eTransistors
1131400 Push Switch TR701, 702
o [5318850 Balance Volume Knob ТВ 705, 706 10306710, 1. NMC1012 0,Y
1015170,1 250k $2 (MN) x 2 Balance Volume TR 703, 704 |
10 {5326612 Lever Switch Knob 1707 708/0301060,1 NMA1012 O, Y
1171130 Lever Switch, muting
11 [592807 Lever Switch Knob C 701 0659801 0.01uF 150V CC.
1171170 Lever Switch, jump C703 ~ 706 0559522 150004F 63V E.C.
12 (2771130 Lever Switch Knob
1171130 Lever Switch, subsonic R701 ~ 708 0159130 0.338 5W CR.
13 [5926672 Lever Switch Knob R 709,710 0202221 2208 2W N.IR.
1171150 Lever Switch, tone defeat
14 (5286721 Knob Guide CO701~703 2450070 AC Outlet
11131410 Push Switch, turn-over
15 5066390 Bottom Plate S 702 1171600 Power Switch
16 [5518820 Tone Volume Knob
1011170 100k (C) x 2, PT 701 4002840 Power Transformer
Treble & Bass Volume PT 702 4002830 Power Transformer
17 2430290 Headphone Jack
18 ooo Speaker Selector Knob
1101900, 1 Rotary Switch, Speaker
19 5507070 Leg
20 [от Lever Switch Knob
1171630 Lever Switch, Power
10
6. REPLACEMENTS & REPAIR NOTES
6-1. Power Supply Circuit Board, F-2844 for
1)
2)
3
—
2.
1)
2)
3)
ND à
——
3
—
4.
1)
7. NOTES/
pre-amp section(refer to pictures on page 9. 10)
Remove bottom plate 15
Take off a screw for installing F-2844
The circuit board, F-2844 can be easily off by detaching double-
faced adhensive tape just on the back of point(A),
Power Supply Circuit Board, F-2845 for power amp
section
Take off 8 screws (b, c, d, e, f, g, h, i) fixing the taps of electrolytic
capacitors of C705, C703, C704, C706 with the circuit board.
Disconnect a grey wire soldered only on GND lag, (j).
Plug out two orange wires from plug socket, “‘k’’, on the circuit
board.
. Protector Circuit Board, F-2840 and Rectifier Circuit
Board, F-2928
Remove bottom plate first.
Take off 5 screws (I,m) for installing the rear panel and the
panel will be easily off.
Then take off 4 screws (n, 0) installing F-2840 board, and the
F-2840 with F-2928 board can be off, (The board, F-2840, can
be separated from F-2928 by removing two screws, (p). )
Power transistors
Remove bottom plate.
Take 4 screws (4, г, $, t) off for installing heat sink and discon-
nect wires (u, v), then pull the heat sink out of bottom side.
Please consider the following notes when using the external system
selector with this AU-919 having wide-spread frequency range
extended to 500 kHz and high slew rate, 200V/usec.
1)
11
To avoid hum-noise, blow of power or driver transistors, connect
firmly an earth wire between turntable, the external system
selector and this AU-919,
6-2. Repair notes
1)
2)
3)
4)
Turn level volume down or power switch off, when inserting or
disconnecting shilded cable with plug into/out of input terminals
on rear panel of AU-919.
Otherwise, power driver transistor (s) or speaker would be
defective due to clicks occured by the contact inside the famale
plug.
If you replace the defective power transistor (s), check all other
transistors on driver amp circuit board, F-2839.
When dismounting heat sink, check or repair of equalizer amp
circuit board, F-2835 can be made, as the circuit board is holded
with heat sink together by two screws.
There are six kinds of ranks (K2, L1, L2, M1, M2, N) of both
FETs, 25K163 and 25]44 respectively on MC head amp circuit
board, F-2833, and the circuitry on the board is parallel-connected
complentary arrangement using PNP (2SK163) and NPN type
(25J44) FET.
When you replace either 2SK163 or 2SJ44, please note the
following instructions referring to the list on page 3
1. Use same rank of all FETs on one channel.
2. Each rank of FET determines the total gain in quantity per
one channel, therefore, total quantity of FET on one channel
is dependent upon the rank, due to slightly different gm.
even in the same name FET.
* As to total quantities of 2SK163 and 2SJ44 per one channel,
refer to the list on page 3.
When using external system selector for switching audio components—
receivers, amplifiers, decks and loudspeakers, etc.
2) Do not connect earth wire commonly between outer shielded side
(GND) of pin cord (or outer side of famale pin plug of input
terminal of AU-919) and GND terminal(s) of the system selector.
3) After the above connection, confirm that oscillation noise or
annoying noise dose not come from loudspeakers, if possible,
that additionally it does not make oscillation through wide
bandwidth 10 MHz or more oscilloscope.
AU-919
_
A
B
* Design and specifications subject to change without notice for improvement.
AU -9 í o * La présentation et les spécifications sont susceptibles d'6ter modifiées sans préavis par suites d'améliorations éventuelles.
*
Anderungen, die dem technischen Fortschritt dienen, bleiben vorbehalten.
F
G
8. SCHEMATIC DIAGRAM /8-1. Pre/Main Section
Е-2834 |
L CHANNEL
Cor
TUNER
On
y PHONO-2
MM)
(
оке.
PHONO-1
¡ (MM/MC)
PLAY
VO
R CHANNEL
TAPE -2
PLAY
Le
TAPE-]
| PLAY
Ese
(
AUX
TUNER
PHONO-2
PHONO-1
D
HEAD AMP. (MC)
[F-2833 | FETow-10 2SKI63
FET 3.24 09444
TRo 25C1313(G,H)
TRor
>
100u 25V | 7004
Kagg ОК
VRo3~06
33K(B)
09
K25 560K Raz
25A992(F,E)
C470.12(6)
TR101, 102
201813(6, H)
SAT26LF, 6)
3
$ ©
9 5
©
100 35Vx2
A
C45 0.0033
Res
Sorb
03
04
Sold
voltage
835
VRo1, 02 Center DC W ..
Adjust ^ 5
CONTROL
SWITCHES
ju.
FLAT AMP. _
F-2841]
TR 1) ~14
2SCI845(F,E)
' VRo: 470
| 7K07--10,15,16
254992
(F,E)
SS
u
S
Rog 470
3 =
< |< Ry 22 Rig 22
IK
FET 01,0
2SKI29IL, M)
7001,02
RDS. Ie (Cc)
RDG E(B)
Rı2
1 УАол, 02 center DC
0 Adjust
[F-2846]
¡| Sore
2
1
Soc % 5019
[F-2838 |
| POWER AMP IN
077508] У/ 504
Fog Cys 0.0)
TREBLE 1.2K
PRE OUT
ГИГ.
ARlor
VRoza
K13 680
|
1
Loops
SYMBOL
A Ceramic WStyrol
© Mylar
PP) Poly propylene Film
(BP) Bi-Polar Electrolytic
© Low-leak Electrolytic
O Poly carbonate Film
E Non- Inflamable Resistor
m Metal-Inflamable Resistor
RESISTORS
Are in ohms, 4 Watts,
+5%Tolerance
Unless othewise Noted.
Kk, M:MS2
CAPACITORS
Are in uF, Unless Other-
wise Noted. P: pF
TOLERANCE
6:+2%,F:31%
Fach D.C Voltage shows the nominal
Value in Volt at no signal.
Som O2 1 Sort
5024 Saab
LED 792~106
[F-2835
SWITCHES & CONTROLS
1. phono-2 Tone
2, Phono -1 MC F -2846 [
3. phono -| MM (503)
4. ипег Subsonic
5. aux F-28456 [
Selector |
Tape rec | 1. tuner (Sos)
F-2835
Sora-g)
F-2837
(Sora-a) | 3.source F-2843 [
(Sora-d)
5.8 D2 DI
Tape play Sore~A [
. source
. tapel
„Source
‚баре?
(Sora, b) F-2838
Power
(5702)
off
. on(-16dB)
DRIVER _ _
-2 TRoroo.21,00.05,26 2S8C20T1(B,V) 7Rg.02324,2,2501845(F,E)
FET, (F TR
2.on
Pre-power
A 7
AS
| |
S
N
%
C53 ЗР
100435y “0?
8
QF TR, 09 Cz3
Cos 4704 63V
9
&
ZDo1,02 RD27F
2003, 04
2p} ~04 MVI03
10D-2
IN34A
VRor,oe Center DC QV Adjust
VRo3,04 Bias Current Adjust
7Req, 250357 (D,E)
S
$ 20607
£060) RD24E(B)
\. defeat
1. off Treble. VRoeas F~ - 2842.
2. 16Hz
2, Of F Tone selector BASS
1. 300Hz
2. 150Hz
TREBLE
1. 3kHz
2. 6kHz
1. CONNECTED oololo
2. DIRECT COUPLED - 2%
3. capeciTor coupuep SEP ARATED Sst e
1. off ysremn
2. A (direct)
3, B
4, À
1, on
2. On
2SA939(B,V) 7e
7А 707,702, 705, 706
TR29 0 2SD0382(K,L,M
)
R703, 704, 707, 708
МАО (С №)
SPEAKERS
000% +.00/349]
PHONES
120 mW +20 [BR
Both channel
driven at
7000Hz
Rea 1.5K (2)
Ken ¡OK
602,603, 45 (PQ) 606,
25694
250438 Е
5701a
2 o;
o Po | System A
- +
taf
2801313 IN34A
2SA726
BCE
|
25C945
250438 MV103
a MV12
+
0
Sea? 1524730
q
| 3 |
RD6.2E
25A939 ae
25C2071
502 RD24E
ay RD27E
gy
se RD27F
be г
258527 5
250357 Г
— y
10D 2
|
SV03
..
| Dy
| | | $ |
| a ! J
о RB152
I
1
2SF656
NMC1012
NMA1012
kw)
o \ el e 3531
2502259 Ne
254979
Re
* Design and specifications subject to change without notice for improvement.
* La présentation et les spécifications sont susceptibles d'éter modifiées sans préavis par suites d'améliorations éventuelles.
* Änderungen, die dem technischen Fortschritt dienen, bleiben vorbehalten.
A B C
D
AU-
13
8-2. Power Supply Section
JAPAN Model
Co1,02 0.1u250V
Do1,02 SS -3
- Cro7 = 0
Dos, SS-SR rau à
AC 100V
50/60Hz
C703 ~706
150001 63V
TOTAL
100W
250W MAX MA
&
(03-06
lu 250V (U)
TRox op 20357 (D,E)
10)
Rr!)
TRoz
Ra 108)
Da5.06 RBIS2
EXPORT Model
Rie R20
C07 O.ju 250V
Thon ce 25B527(D,E) 1
AC
100, 120V
220, 240V
50/60Hz
TOTAL
250WMAX
I
|
|
_ +
Dor RBI52
7Ro, 2SD357(D,E)
TR, 25C1313 (G,H)
TRo3 258527 (0 Е)
2SA726(F,G)
TRos 2SC2259 (F,G)
5 2SA979 (FG)
205; RD24E (B)
=
SS
X

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