Tensai TA-2045 User manual

SERVICE
MANUAL
(il TENSAI
INTERNATIONAL
HI-FI
STEREO
AMPLIFIER
MODEL
TA-2045

CONTENTS
SPECIFICATIONS
1
PROTECTION CIRCUIT 1
DESCRIPTION OF EXPLODED VIEW 1
EXPLODED
VIEW
2
BLOCK
DIAGRAM
3
SCHEMATIC
DIAGRAM
4.5
TRANSI$TOR VIEW 6
P.C. BORD AND PARTS LIST 6.7.8

SPECIFICATIONS
Amplifier section
Continuous power output 4 ohms 2x60W
at 1KHz both channels driven 8 ohms 2x 40W
T.H.D. 1W 0.1%
Rated output 0.2%
Power bandwidth 20—-50000Hz
Frequency response 17—40000Hz
Damping factor 50dB
Input sensitivity Phono 2.5mV
Mic > 2.5mV
Aux : 160mV
Tape > 16Q0mV
Cross talk | 1KHz : 60d8
1OKHz : 40dB
PROTECTION CIRCUIT
1. Transient Kill |
This circuit is designed to protect the speaker from the
damage or reject unpleasant noise when power switch on and
off.
When turn on or off the power line network composed by
D602, D607, R605, R606, C602, C605 Turn on Q601 for 2
seconds each time.
if Q601 turns on, Q506 is turned on too,whichis connected
to a bias circuit of transient kill.
And then Q505 also be turned on these absorb the _ input
current of driver transistor Q509, Q0510.
Therefore no thump appears at speaker output terminal.
DESCRIPTION OF EXPLODED VIEW
.
Part No.
S/N ratio Phono 70dB
(Unweighted) Mic 65dB
. Aux 85dB
Input overload 120mV
_ Tone Control 100Hz +10dB
10K Hz +10dB
Loudness 100Hz 10dB
1OKHz 6dB
Filter Low : 7dB
High : 7dB
Muting 20dB
2. Current Limiter ““L”
This circuit is designed to protect the speaker amd power
transister from damage when the over current is flowed to
power transistor by shorting the output or overload.
If the over current flow to R521, R522 and the voltage drop
across the resistors more than turn on voltage of O507 and
Q508 then these transistors are turned on and the input of
Q509, 0510 is shunted. |
Hence this circuit protects the power transistor and speaker
from damage by limiting the over current.
Pets ENo.
Knob for Control 22-524 Volume and Balance Switch 7)-02 0
2) Knob for Push 22-009 Master Chassis 1/-01 1
3) Knob for Volume and Balance 22-526A, 22-5268 Phone Jack 5|-40 2
4) Handle 38-001 VU Meter : 51-81 O
. 5) Knob for Control 22-524 Steel Cabinet | 2|-506
6) Front Panel 20-023 P.C.B |
7) Meter Lens 40-217 B.K.T. for Heat Sink 3'-00 5, 32-004
8) Felt for Level SW. 80-422 Retaining Clip
9) Bezel for Push 40-002 Electric Capacitor
10}
Front
Chassis
—
.
10-021
R.C.A.
Connector
4p,
8p,
10p
5
'-20
2,
51-201
11) Aj. Plate for Meter 33-004 5.205
12) B.K.T. for Volume and Balance 32-099 ;
13) Grommet for Lamp 40-401 ee 71400 1
14) Power & Speaker SW. 52-306-30 rt et
15) Slide Rotary SW. 62-317 Heat Sink 8(30 1
16) PC.B Din Connector 5p 5-30 1
17) PC. B Fuse Holder 5440 1
18). Rubber Foot 40-301 le aaah 21202
19) Bottom Cover 13-023 Peae? Pe rmite 5 -00
20) P.C.B Back Chassis 14902 1
21) , Wie ick 51-401 AC Cord W/Kemma Plug 6/-30 1
22) Mic Level Switch 70-006 a) Gerd Stenger 44503
23) Lamp 51-704

EXPLODED VIEW

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P.C. BORD AND PARTS LIST
EQ & SELECTOR SW. B.D. S1008D
Mic & SW. B.D. $1091D
Pre Amp B.D. S1018F

S1018F Pre Amp B.D.
Symbol
Description
j|Location|
Symbol
Description
Location
R301 5.6K62 + 5% %W 1B C301 330PF + 10% 1B
R302 56KQ ‘| 1B C302 330PF « 1B
R303 10K92 1B. |: C303 O0.0068UF + 5% (M) 1B
R304 10KQ.. 1A C304 0.0068UF | 1B
R305 3.9KQQ 1B C305 2.2UF 16WV (T) 1B
R306 3.9KQ. 1A C306 2.2UF 1A
R307 220KQ2. 1A C307 A7UF 6.3WV 1A
R308 220KQ2 1A C308 47 UF " 1 1A
R309 56KQ. 1A C309 10MF 25WV 2A
R310 4.7KQl 1A C310 10UF 10WV 1B
R311.
|
4.7KQ
1A
C311
10UF
10WVq
2A
R312 56KQ— 1A C312 0.0022UF = 5% (M) 2B
R313 47K92 1A C313 O.02UF ” 2B
R315 8.2K02 1A C314 0.0022UF "’ 2B
R316 47KQ2 1A C315 0.02uUF ” ' 2B
R317 8.2KQ2 ” 2A C316 0.02UF 2B
R318 WKY.” 2B C317 0.0022UF ”’ wW
R319 8KQ.” 2B C318 0.02uUF " ; 2B
R320 1KQ is 1B C319 0.0022UF " 2B
R321 KQ is 2B C320 10UF 16WV 2B
R322 10KQ2" 2B C321 10MF 16WV 2A
R323. | 10K82 2B C322 =| 0.47uF 16WV (T) | 2B
R324
18K92
"
2B
C323
O.47UF
|
on
R325 | 100KQ2 " 2B C324 | 47PF + 10% 1B
R326 100K{Q2_ 2A C325 47PF OA
R329 5.6KQ2 2B C326 100 pF 25WV 2A
R330 5.6KQ2” 2A C331 100MF 1GWV 2A
R331 68KQ2.” 2B |
R332 68K{2."” 2A VR303 | 100K{2(B) % Potentio ; 2B
R333 56002” 2B VR304 ” 2B
R334 56082" 2A VR305 V 2B
R335 4.7KQ" 2B VR306 " 2B
R336 4.7KQ. 0" 2A Q301 2SC 1681 1B
R337 1KQ v 2B Q302 2SC 1681 1A
R338) | 1KQ2 2A Q3v3 2SA 841 | 1A
R339 wKOQ 2A Q304 2SA 841 2A
R340 82K92 2B Q305 2SA 841 2B
R341 82K0R2 2A Q306 2SA 841 2A
- R342 47KQ. 2A Q307 2SA 564 2A
R343
22KQ2
2A
|
R344 10082" 2A
$1015K Meter & Supply B.D
Symbol Symbol Location
R601 | 22KN +5% %W 1AB C606 0.0047uF 136 *}| 2A
R602 | 5.6KQ ” 1B C607 0.0047uF +89 2A
R603 | 1.5MQ ” 1B C608 0.0047 uF ” 2B
R604 | 47KO ” 12B C609 0.0047 uF ” 2B
R605 | 100K ” 2B C610 1uF S5OWV 1A
R606 | 10KQ ” 2B C611 1uF 5OWV 1B
R607 | 1KQ ” 2A C612 10uF 5OWV 1A
R608 | 1:2KQ an 2A C613 10uF 50WV 1B
R609 | 4.7K ” 2A C614 0.47uF 50WV 1A
R610 | 3309 +5% 4W 2A
R611 10KQN+5% %4W 2A
R612 1OKQ ” 1A D601 HZ-7B Zener 2A
R614
|
4.7KQ
”
24
D602
MA
161
2B
R615 | 4.7KQ ” 2B D603 30D! 2A
R619 | 1000 ” 1B D604 i 2A
R620 | 1000 ” 1B D605 i 2B
R621 | 2.2KQ ” 1A D606 , 2B
R622 |2.2N KQ » 1B D607 MA 161 2B
R623 4700 " 1A ~ D608 HZ-5B Zener 1A
R624 | 4700 ” 1B D609 y 1B
R625 | 220KN ” 1AB D610 IN 34 1A
R626 | 220K0 ” 1AB D611 IN 34 1B
D612 IN 34 1A
VR601 | 100KQ Semifixed 1A D613 IN 34 1B
VR6O2 | 100K Semifixed 1B
1
C602 | 47uF 35WV 2B Q601 2SC 734 1B
C603 | 22uF 35WV 2A Q604 2SC 1166 2A
C604 | 100uF 25WV 2A Q605 2SC 733 2A
C605 | 4.7.F50WV | 1B Qa606 | 2S8C733 | 2A

$1005D Main Amp B.D.
YW
:
R501 1K+5% C503 1uF 50WV Q506 2SA 561 2B
R502
2.2K
”
a
C504
20PF
ie
Q507
2SC
734
1A
R503
68K
”
2B
C506
10uF
10WV
2B
Q508
2SA
561
nN
R504 22K , 3B C507 A7 uF 35WV 2B Q509. 2SC 1567 1A
R505 2.7K ” 1B C508 0.01 uF 1A Q510 2SA 794 2A
R506
|
470K
»
1B
C509
0.01
uF
2A
Q511
2SD
428
A
R507
150
”
1B
C510
0.047
uF
2B
Q512
2SB
558
mn
R508 560Q 2A C511 470PF 2B 0513 2SC 1681 3B
R509
2.7K
”
2A
C512
0.47uF
50WV
3B
Q514
2SC
1681
3B
R510 2.2K ” 2A C513 20PF 4B Q515 2SA 777 4B
R511 10K» 3B C515 1uF 5OWV 2B Q516 2SC 828 3A
R512
39K
”
2A
C516
10uF
10WV
3B
Q519
2SC
734
AA
R513
27K
”
2B
C517
4.7uF
35WV
3B
Q520
2SA
561
3A
R515 2.2K ” 2A C518 0.01 uF aA 0521 _ 2SC 1567 4A
R516
|
22K
no
1B
C519
0.01
uF
3A
0522
2SA
794
3A
R517
1200»
1A
C520
0.047
uF
4B
0523
2SD
428
4A
R518 6800» 1A Q524 2SB 558 3A
R519
6800»
2A
vR501_
+|
5000
1A
R520 1200.» 2A vVR502 | 5000 3A D501 IN4149 1B
R521 0.330 +5% 2W 1A D502 IN4149 4B
R522 0.330 +5% 2W 2A L501 2.74uH Choke coil 1A D503 IN4149 3B
R523
300
+5%
1W
1B
6|
~~
=©L502
”
4A
D504
HZ14B
3B
R524
3.30
+5%
%W
1B
D505
IN4149
2A
R526 102 +5% 1W 1B Q501 2SC 1681 2B D506 IN4149 3B
R527 2.2K+5% %W 3A Q502 2SC 1681 2B D507 IN4149 1B
R528 1K ” 3B Q503 2SA 777 1B D508 IN4149 2A
R529 68K ” 3B. Q504 2SC 828 1A D509 IN4149 4B
R530
2.2K
”
4B
Q505
2SC
734
3B
D510
IN4149
3A
R531 22K ” 3B |
R532 2.7K ” 3B
R533 470K” 3A
R534 150 ” 4A
R535 560 ” 4A
R536 2.7K ” 3A
R537
2.2K
”
3A
|
:
R542
22K+5%
%4W
3A
R543 1209.» 4A
R544 6802» 4A
R545
6800»
3A
;
R546
1200
3A
R547 22K ” 4B
R548 0.332 +5% 2W 4A
R549 3302 +5% 1W 4B
R550 3.30 45% %W 4B
R552 102 +5% 1W 4B
R553 0.339 +5% 2W 3A
R560 68K+5% %4W 1B
R561 68K ” 3B
C501 A7OPF 2B
C502 0.47uF 50WV 2B
$1081 Selector B.D.