BBK AV210 User manual
ENGLISH
AV210
SERVICE MANUAL
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Cir cui t Makeup................................................................................................1INPUTPART.....................................................................................................2...................................................................................................................................5.MicrophoneCircuit............................................................................................6.PowerAmplifi cationandProtectionCircuit.........................................................
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..................................................................I NSTRUCT I ONSTOTHE CI RCUI TS 1.THEFRONTCONTROLPANEL.........................................................................2.THEMAINAMPPART........................................................................................
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..................................................THEE XPL ANATI ONFORKEYCOMPONENTS CPUICW78E54..............................................................................................volumecontrolICM62446................................................................................EcholCPt2399................................................................................................
Vol umeadj ust ment , soundf i el dpr ocess i ngandEQadj ust ment ci r cui t s3. I nput si gnal sdet ect , sear chandf r equencys pect r umsampl i ngci r cui t s. 4. Contr ol Ci r cui t . 1
1
3
3
4
8
10
12
12
16
24
24
25
27
CAUTIONS
There is high voltage inside this unit. Make sure to pull out the plug of this unit before
repairing!
There are many high voltage components inside this unit. Please pay attention to all
warnings and instructions marked on this unit to avoid electric shock!
Specifications of the replaced components must be the same as that of the original
components. Do not change the components' specifications to prevent risks!
CONTENTS
- 27 -
Echo IC Pt2399
- 1 - - 26 -
¢ñCi r cui t Makeup
1. INPUT PART
AV210 has three ways of the analog audio source input and one group of 5.1 channel input
jacks. Their switch is realized by the electronic switch. The circuit incorporates two kinds of
electronic switch IC: CD4052 (dual channel one out of four electronic analog switch) and
Cd4053 (trio channel one out of two electronic analog switch). Their real value tables are as
follows:
A
B
X0 X1 X2 X3
0
00
0
1
1
1
1
CD4052 REAL VALUE TABLE
A
1
XBYC
0
X1 1
Y0
0
Y1
0
1
X0
Z
Z0
Z1
CD4053 REAL VALUE TABLE
There are stilltwo important controlsignals SELand SEL1 inthis circuit. WhenSEL is
high level, thecircuit is inthe mode of5.1 CH inputfrom outside. WhenSEL1 is high
level, the circuitis in thecyber logic mode.When both ofthem are lowlevel, the circuit
is in theHi-Fi mode (directmode) and thestandard sound fieldprocessing mode. They
work in thefollowing steps.
When pressing the INPUT button, the levels A and B from
the pins 38 and 39 of the CPU N422 are added into the pins 9 and 10 of the electronic
switch N401. The electronic switch selects the input mode circularly from VCD, CD,
AUX and 5.1CH according to different combinations of levels A and B. It can be divided
into two modes: 5.1CH and three analog input modes. Their signals' flow is as follows:
1.1 5.1CH input mode: In this mode, A and B are high levels, L and R channel signals
are sent out from the pins 3 & 13 of N401. Then the levels reach IC N402 to be master
volume adjusted after amplified by N407A and N407B. At the same time, the pin 32 of
CPU N422 sends out a high level to the electronic switch N410's pins 9, 10 and 11 (SEL
control signal). C, SR and SL signals are sent out from the N410's pins 14, 15 and 4
to IC N402 where separate volumes are adjusted. SW signals (D-SW) is sent to the IC
N402's where the volume is adjusted. Therefore, the 6 channel signals of 5.1 CH input
are selected by the electronic switch and added into the electronic volume adjusting IC
where the separate volume adjustment is performed. Then the signals pass to the rear
circuit, the whole unit's input source is selected as 5.1CH input mode.
1.2 Three analog input mode: Press the INPUT button to select one of the VCD, CD
and AUX. The select function is performed when the control levels A and B from the pins
38&39 of the CPU N422 are added to the pins 9&10 of the electronic switch N401. The
signals of L& R channels are sent out from the pins 3&13 and then amplified in the oper
ational amplifier N407A and N407B. AV210 incorporates three processing modes to the
signals: Hi-Fi, Cyber Logic and standard stereo. Their signal's flow is as follows:
1.2.1 Standard StereoProcessing Mode: The L & R channelsignals from theN407A
and N407B areadded to theIC N402 wherethe electronic volumeis adjusted.At the
same time, asignal selected fromthe L channel passes N408Aand N406B wherethe
signal is processedthrough low passfilter to obtaina subwoofer signal(S-SW). S-SW
is added toN411's pin 5 andthe pin 9(SEL) is lowlevel. Accordingto the realvalue
table, S-SW signalis sent outfrom the pin4 to N402'spin 6 wherethe electronic volume
is adjusted. Inthis mode, thisunit is inthe three channeloutput mode.
- 2 -- 25 -
1.2.1 Hi-Fi ProcessingMode: The signal flow is the same asthat of the standard stereo
mode. The electronic volume adjustingIC N402 shut off other audio channels under the
control of theCPU. Neither the sound fields processing and balance adjustment can be
performed. Therefore, S-SW cannot besent out andthe whole unit is in the two channel
output mode.
1.2.3 Cyber Logic:L&R channel signalssent out fromN407A and N407B reach the IC
N402 where theelectronic master volume is adjusted. Meanwhile, the signals selected
from the channelL passes through the low pass filter N408Awhere it isdivided into two
lines. One linereaches the pin 13 of N411 through R657and another line reaches the
pin 5 ofN411 after it is amplified through the low pass filter N406B. The signal selected
from the channelR reaches the pin 1 of N411 after being amplified through the lowpass
filter N408B. N411's pin 9 (SEL) is thelow level.According to the real value table, the
S-SW signal sentout from the pin 4 is added to the pin 6 ofN402 where theelectronic
volume is adjusted.The pins 10&11 (SWLL) are highlevel. According to the real value
table, the centralchannel signal (S-C) sent out from the pin 14 of N411 and the surround
channel signal (S-S)sent out from the pin 15 of N411 are addedto the pins 12, 2 and5
of N410. (TheS-S is divided into two signalssurround left and surround right.) Atthis
time, the pins9, 10 and 11 (SEL) are low level. According to the realvalue table, these
three lines ofsignals sent out from the pins 14, 15 and 4 reach theIC N410 wherethe
volume is adjustedseparately. This unit is in thesix-channel output mode.
The relationship ofall input source switches and sound processing mode is shown as
Figure 1.
Press the INPUT
button to select
circularly
Three modes
input
Hi-Fi mode Only L & R channel outputs,
Sound fields and
EQ settings are invalid
Only L,R & SW channel outputs,
Capable of setting the
Concert sound field and EQ
6 CH output, capable of setting
the Theater sound field and EQ
6 CH output, capable of setting
the Theater sound field and EQ
Standard
Stereo
mode
Cyber Logic
mode
5.1 CH input
(Figure 1)
volume control ICM62446
- 3 - - 24 -
2. Volume adjustment, soundfield processing andEQ adjustment
circuits.
All channel signalsare sent to N402 inside which the independent volumeadjustment,
EQ adjustment andall sound field modes process are performed.
The sound fieldprocessing and EQ adjusting circuit is mainly processing theL&R
channel signals.According to the schematic diagram, the L&R channel signalsare
added simultaneously tothe pins 15, 17, 13 and 16 of N402.When the unit mode is in
the Hi-Fi mode,the internal circuit of the pins 17&16 is connectedand the other input
signals are cutoff. At this time, only the L&R channel volume canbe adjusted and only
the pins 31&32send out signals. Therefore, the unit is in the 2CH outputmode. The
unit mode isnot in the Hi-Fi mode, other input signals areconnected but the pins
17&16 signals arecutoff. At this time, all channel volumes can be adjusted
independently and thesound field processing or EQ adjusting of the L&Rchannels
can be performed.Finally, all channel signals pass out from the pins 31,32, 33, 34,
35&36. The SW channel signalfrom the pin 36 reaches the amplified speakers tobe
amplified through theSW output terminals. Other channel signals reach to thepower
st
amplifying circuit tobe amplified. The L&R channel signals will go through 1 grade
LPF and MIXamplification (Karaoke signals are overlapped into L& R channels).
3. Input signalsdetect, search and frequency spectrum samplingcir
cuits
3.1 Input signalsdetect and search circuit: The six channel signal lines of theinput IC
N402 are connectedwith 100K sampling resistors R533, R534, R657, R676 andR678
respectively. The signals are mixed bythese resistors and added to the opposite-phase
input terminal tobe amplified. VD431 and C481 connected to N403B's outputend
constitute half-wave rectifyingfilter circuit. Then the signals reach the voltage comparer
composed of N403A.The output end of N403A(SEARCH)is connected to the pin 28 of
CPU. This control signal isthe search and detect signal: when it is lowlevel, it enters the
search mode; whenit is high level, it stops searching. Its worksas follows:
3.1.1 When thisunit is getting started, theA&B control signals from the pins 38&39 in
the domination ofthe CPU's inter program are added to the inputselect circuit to
search circularly once.When there are no signals in these four inputconnectors, the
VCD mode stopsautomatically. When there are signals in one of the fourconnectors,
AC signals willappear in all channels of the input N402. These ACsignals are
amplified by N403Band rectified and filtered by VD434 and C481 tobecome DC
signals. Atthis time, the opposite-phase voltage of N403A is0.01V. When this DC
voltage surpasses 0.01V, the output end of N403B sends out ahigh level (SEARCH)
close to positivepower supply voltage (A+6V) which reaches the pin 28of CPU. CPU
keeps searching inthe connector in which there are input signals andthe unit will play
normally.
1.2.2 When pressthe SEARCH on the front panel,CPU sends out A&B control
signals again tostart searching. Meanwhile, the pin 27 (EX) sends outa high level
which makes V446inductive. The emitter of V446 sends out a high level whichpasses
through R498 whichmakes the opposite-phase voltage of N403Ato be 0.4V. That is
to say, if you want to stopsearching of CPU, the gained voltage after the inputsignals
are rectified andfiltered must exceed 0.4V. This voltage is higher than 0.01V when
this unit isgetting started in order to avoid that the CPUreceives signals mistakenly
and stops searchingdue to the large external interference signals. If theinput signals'
amplitude is nothigh enough, CPU will continue searching. When the amplitudeis
high enough, N403Asends out high level to the pin 28 to stop searching. The pin 27
(EX) will becomelow level again and the opposite-phase voltage of N403Awill also
returns back to0.01V. The whole searching process isfinished.
¢óTHEEXP L ANA TI ONF ORKE YCOMPONENT SCPUI CW7 8 E5 4
- 4 -- 23 -
3.2 Spectrum SamplingAmplification Circuit:The routes carrying the five-channel
signals sent fromthe IC N402 are connected to the sampling resistors R494, R495,
R496, R565 andR566 respetively.(The SW channelsends out the signals directly.) After
being mixed bythese resistors, the signals reach N406Ato be amplified. The incurred
spectrum analyzing signalsource is sent to the front panel circuit.
4. Control Circuit.
The control circuitof this player is divided into CPU Circuit, Front Panel Control and
Display Circuit andSpectrum Analyzing Circuit.
4.1 CPU Circuit
N422 (AT89C540) is this unit's CPU whichsends all commandsto the command-
controlled circuits toperform all control functions. It incorporates +5V power supply and
its pin 40is the power supply pin. The 12M crystal oscillator provides the work clock for
itself. The pin 9 isthe restoration pin. When this unit is getting started, +5V passes
VD409 to reachthe positive pole of C531. Because of the C531's charging, its negative
end sends outan instantaneous high level which passes through R686 to reach the pin
9 of N422.The pin 9 of N422 restores the low level mode with the end ofcharging. This
restoration circuit's styleis the high level restoration to keep in low level. You can also
refer to thecircuit diagram for other command instructions.
The static informationsuch as the power-on logo and on screen displays when this unit
is working isstored in the CPU's static memory. N421 isa power-off-mode memory which
can record theworking information when this unit is turned off and call back these
information when thisunit is turned on next time. Therefore, you need not to readjust the
unit every timeyou turn it on. Furthermore, the sound field modes that you setare also
stored in N421,which can be called back when needed.
4.2 Front panelcontrol and display circuit
This circuit incorporatesan exclusive IC N901 (UPD16311). Its pins10, 11, 12 and13
are connected tothe press scan matrix which receives the control commands from the
user and processthem into two-line outputs: One line reaches to the VFD to displaythe
working modes, anotherline passes pins 5, 6, 8 and 9 to CPU to finishthe control
functions.
N902 is theremote control sensor. It convert the infrared signals received to electric
signal and thensend it to the pin 13 of CPU to finish the remotecontrol function.
RP901 and RP905comprise a digital pulse potentiometer. When rotating it, a series of
digital pulse willbe sent out and added to the pins 23, 24, 25 and26 to bedetect and
processed to finishthe control functions. RP901 finishes the master volume adjustment
and RP905 finishesmulti-function adjustment.
ToEncoder(Master)
R621
680K
R618
100K
R619
1K
R626
1K
R622
1K
R627
5.6K
R623
10k
R625
2.2K
R620
10K
+12V
-12V
R613
10K
R608
10K
R603
10K
R598
10K
R593
10K
C524
223
C515
272
C518
682
C521
683
C527
154
R596
1K
R597
10K
R601
1K
R602
10K
R594
5.6K
R599
5.6K
R604
5.6K
R609
5.6K
R614
5.6K
R595
82K
R600
82K
R610
82K
R615
82K
R606
1K
R607
10K
R611
1K
R612
10K
R616
1K
R617
10K
C516
272
C519
682
C525
223
C523
2.2U
C526
2.2U
C529
2.2u
C520
2.2U
C517
2.2U
C522
683
R605
82K
12
13
14
N417D
LM324
12
13
14
N418D
LM324
3
2
1
411
N418A
LM324
10
9
8
N417C
LM324
C528
154
-12V
35Hz
100Hz
300Hz
1KHz
3KHz
10
9
8
N418C
LM324
VD446
1N4148
VD445
1N4148
VD444
1N4148
VD443
1N4148
VD442
1N4148
C507
10u/16V
+12V
R588
10K
R583
10K
C509
152
C512
681
R586
1K
R587
10K
R591
1K
R592
10K
R584
5.6K
R589
5.6K
R58582K
R59082K
C510
152
C513
681
C514
2.2U
C511
2.2U
3
2
1
411
N417A
LM324
10KHz
16KHz
5
6
7
N418B
LM324
VD441
1N4148
VD440
1N4148
R580
1K
C508
10u/16V
X4
1
X6
2
XCOM
3
X7
4
X5
5
INH
6
VEE
7
VSS
8C(2) 9
B(1) 10
A(0) 11
X3 12
X0 13
X1 14
X2 15
VDD 16
N416
4051
X4
1
X6
2
XCOM
3
X7
4
X5
5
INH
6
VEE
7
VSS
8C(2) 9
B(1) 10
A(0) 11
X3 12
X0 13
X1 14
X2 15
VDD 16
N419 4051
R581
10K
R582
470K
5
6
7
N417B
LM324
-12V
+12V
S-6.2V
3
2
1
84
N420A
4558
5
6
7
N420B
4558
VD447
3.3V
+12V
V435
2N5551
V437
2N5551
EC
B
V436
2N5401
R628
4.7K
R572
180k
R571
75k
R576
4.3k
R579
10k
R5771.5k R57427k
R578
2.2k
R624
10K
VD449
1N4148
VD450
1N4148
D+5V
VD448
1N4148
D+5V
R573 470k
-12V
+12V
S+6.8V
DIS1A
DIS1B
DIS1C
DIS2A
DIS2B
DIS2C
C530
104
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
25
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
24
23
22
21
Vcc
P00(AD0)
P01(AD1)
P02(AD2)
P03(AD3)
P04(AD4)
P05(AD5)
P06(AD6)
P07AD7)
EA/Vpp
ALE
PSEN
P20(A8)
P21(A9)
P22(A10)
P23(A11)
P24(A12)
P25(A13)
P26(A14)
P27(A15)
P10(T2)
P11(T2)
P12
P13
P14
P15
P16
P17
RST
P30(RXD)
P31(TXD)
P32(INT0)
P33(INT1)
P34(T0)
P35(T1)
P36(WR)
P37(RD)
XTAL2
XTAL1
GND
N422
AT89C54
DISPLAY
1
2
3
4
5
6
7
8
9
XS4
8PIN
A
SDA
LATCH
B
SCK
CLK
DATA
To CD4052
To M62446
RelayControl
REMOTE
CLK
DATA
STB
A1
B1
A2
B2
To uPD16311
ToEncoder1(MasterVOL.)
o2Jog
C661
20P
C662
20P
G401
12M
L406
100uH
D+5V
534
104
R575
1k
R570
1k
VD438
6.8V
VD439
6.8V
C506
47u/16V
C505
47u/16V
S+6.8V
S-6.8V
1
2
3
4
5
6
7
8
9
RR901
8*4.7K
C535
47u/16V
R629
10k
C531
10u/16V
A0
1
A1
2
A2
3
VSS
4SDA 5
SCL 6
TEST 7
VDD 8
N421
24C02
SCK
D+5V
SDA
SEL
SEARCH
To CD4053
To 24C02
E.OE
K-MUT
R687
1k
R688
2.2k
VD409
1N4004
VD410
4.7V
C665
47u/16V
P-RST
SEL1
R-T
EX
To CD4053(N411)
RelayTest(Y402)
ExchangeSearchLevel
MICMutting
R690
4.7k
R689
2.2k
+A6V
R685
4.7k
R691
4.7k
R680
4.7k D+5V
R686
1k
C668
47u/16V
C669
47u/16V
+12V +12V
-12V -12V
- 5 - - 22 -
4.3 Spectrum analyzingcircuit (The flowchart is shown an Figure 2)
N416
CD4051
Automatic
Spectrum
Gain
Adjustment
}
CPU
DISPLAY +
-
.N419
CD4051
Frequency
Selected
7-band Filter
35HZ
100HZ
300HZ
1KHZ
3KHZ
10KHZ
16KHZ
}
CPU
V437 CPU Pin 12
V435 CPU Pin 1
V436
+5V .
+
-
-
N417B
N420B
N420A
A/D Conversion
(Figure 2)
3
3
4.3.1 Automaticspectrum gain adjustment circuit: In order to avoid that the display
amplitude is toonarrow when the input signals are too weak or the whole display
appears when theinput signals are too strong, this unit incorporates an automatic
spectrum gain adjustmentcircuit which employs a single channel 1-out-of-8 electronic
analog switch N416(CD4051). Its real value table is below. Its working principle is
that it changesthe opposite-phase ground resistor's resistance value of the
operational amplifier N417Bto change the gain times.
We have mentioned before thatthe spectrum analyzing signal source is sent to the
operational amplifier N417B'sin-phase input terminal to be amplified. Its amplified
times depend onthe resistance value of the resistor connected through the electronic
switch N416 tothe opposite-phase terminal. When the master volume is too big, the
CPU will automaticallyadd the ground resistor's resistance value to reduce the am
plification times. Whenthe master volume is too small, the CPU will automatically
reduce the groundresistor's resistance value to increase the amplification times.
CD4051Real Value Table
A
B
X0 X1 X2 X3
0
00
0
1
1
1
1
CD4051 Real Value Table
0
0
X4 X5 X6 X7
1
01
1
0
1
C00001111
V405
2N5551
-36V
VD401
1N4148
+36V
V401
2N5551
V409
2N5401 V410
2N5401
V412
A1694
V406
2N5551
V402
2N5551
V411
C4467
V403
2N5551
V404
2N5401
R403
1K
C405
10u/16V
R404
47K C406
221
R405
2.7K
R407
47
R406
2.7K
R419
33K
R410
1K
C407
100U/16V
R408
47
R409
620
R411
33K
R412
1k
R413
200
C408
33
R416
200
VD402
1N4148
V408
2N5551
V407
2N5551
R418
10
R417
10
R423
10
R422
10
R421
100/0.25W
R420
100/0.25W
R414
4.7K
R415
2K
C409
104
C403
100U/50V
C402
104
C404
104
C401
100u/50V
V417
2N5551
-36V
VD405
1N4148
+36V
V413
2N5551
V421
2N5401 V422
2N5401
V424
A1694
V418
2N5551
V414
2N5551
V423
C4467
V415
2N5551
V416
2N5401
R430
1K
C415
10u/16V
R431
47K C416
221
R432
2.7K
R434
47
R433
2.7K
R446
33K
R437
1K
C417
100U/16V
R435
47
R436
620
R438
33K
R439
1k
R440
200
C418
33
R443
200
VD406
1N4148
V420
2N5551
V419
2N5551
R445
10
R444
10
R450
10
R449
10
R448
100/0.25W
R447
100/0.25W
R441
4.7K
R442
2K
C419
104
C413
100U/50V
C412
104
C414
104
C411
100u/50V
V429
C9014
V428
C9014
V432
C8050
V426
C9014
R492
220/3W
R491
220/3W
R476
2.7k
R425
0.25/3W
R424
0.25/3W
R470
3.9k
R472
2.7k
R473
4.7/1W
R471
3.9k
R484
100k
C436
104
VD415
1N4148
VD416
1N4148
VD420
1N4148
R478
47k
R480
10k R481
10k
R482
47k
C440
220u/25V
C439
220u/25V
C449
6800u/50V
C450
470u/25V C452
47u/16V
C451
470u/25V
C447
6800u/50V
FL404
T6.3A/250V~
FL403
T6.3A/250V~
+16V
V430
C9015
C435
1u/16V
C441
47u/25V
C445
224
C444
224
R485
10k
V427
C9014
R474
3.9k
R477
4.7/1W
R475
3.9k
C438
104
C437
1u/16V
V433
S8550
VD429
12V
R493
2k2
C453
47u/16V
C454
47u/16V
+12V
-12V
R452
0.25/3W
R451
0.25/3W
R479
1k
VD425
1N5404
VD426
1N5404
VD427
1N5404
VD428
1N5404
VD418
6.8V
R486
10k
VD417
1N4148
L401
0.7uH
L402
0.7uH
R
SPEAKER
L
SPEAKER
A
B
C
D
L403
1.8mH C457
~275V104
FUSE
T3.15AL250V
~220V
50Hz 1
2
XS1
2PIN
1
2
XP1
2PIN
1
2
XS2
2PIN
TOsaitchpweroobard
1
2
3
4
5
6
XS3
6P1N
FL402
T4A/250V~
FL401
T4A/250V~
VD421
RL254
VD422
RL254
VD423
RL254
VD424
RL254
C442
2200u/25V
C443
2200u/25V
V431
9014
R483
10k
3
2
1IN
GND
OUT
N412
7812
E.O.E
VD419
1N4148R487
10K
9
10
11
12
13
1
5
2
6
3
7
4
8
14
Y402
RE-402DM
-16v
+36V
-36V
R489
560/1W
R490
560/1W
53
1
2
4
N413
TDA2030
R457
680
R458
15k
C422
22u/16v
+16V
-16V
R459
10
C423
104
C
53
1
2
4
N414
TDA2030
R461
680
R462
15k
C427
22u/16V
R463
10
C428
104
SL
53
1
2
4
N415
TDA2030
R465
680
R466
15k
C432
22u/16V
R467
10
C433
104
SR
R488
10
SL-INC-IN SR-IN
C426
10u/25V
C424
10u/25V C460
103
C434
103
C446
104
C448
104
L
R
C455
104
C456
104
R692
220/0.5W
R693
220/0.5W
R694
220/0.5W
R695
220/0.5W
R453
2.2k R454
2.2k R455
2.2k
C430
151
C431
151
C429
151
Y401
GSADC12V
R401
10k
R402
470k
R426
10k R427
470k
R428
4.7k R429
10k
V440
2N5401
V442
S8050
V441
S8050
MUT1
R682
47k R683
47k R684
47k
V443
9014
R681
10
V445
C8050
V444
9014
VD411
6.8V
MUT2
R-T
C-OUT SL-OUT SR-OUT
C-OUT
SR-OUT
SL-OUT
VD412
1N4148
R497
1k
- 6 -- 21 -
4.3.2 Frequency SelectedCircuit
The signal amplifiedby the N417B is coupled by C508 and then sent to the7-band
filter composed ofthe operational amplifiers. Setting its feedback capacitor's capacity
can define thecorresponding frequency amplitude. The frequency value marked on
their output pointsis the frequency band's central frequency. There's a half-wave
rectifying circuit connectedto the every band filter's output end. The circuit will rectify
the amplifiedAC signals into the DC voltage. The circuit is mainly performing the
frequency sampling functionwhich can show the amplitude of every frequency of the
whole audio signalsthrough the DC voltage. If the low frequency of the current audio
signals is strong,the DC voltage of the 35Hz and 100Hz band filter is higher. If the
high frequency isstrong, the DC voltage of the 10K and 16K band filter ishigher. The
output end ofthese seven band filters is connected to seven input terminals of the
electronic switch N419(CD4051). CPU will send commands to make this electronic
switch select thefrequencies circularly (Refer to the above real value table). The
output terminal ofthe pin 3 of N419 will send out a series of voltagerepresenting the
corresponding frequency's amplitude.(SeeFigure 3)
35HZ 100HZ
300HZ
1KHZ
3KHZ
10KHZ
16KHZ
35HZ
T
V
Switch interval
Frequency selected circularly period
Note:the diagram's
voltage amplitude
is not definite
(Figure 3)
SCHEMATIC DIAGRAM OF THE MAINAMP BOARD
OUT4
1
OUT3
2
OUT2
3
OUT1
4
AVDD
5
SWIN
6
GNDS
7
SRIN
8
SLIN
9
GNDC
10
CIN
11
GNDR
12
RIN
13
GNDL
14
LIN
15
BYPASR
16
BYPASL
17
LTRE
18
LBASS3
19
LBASS2
20
LBASS1
21 RBASS1 22
RBASS2 23
RBASS3 24
RTRE 25
CR2 26
CR1 27
CL2 28
CL1 29
AVSS 30
LOUT 31
ROUT 32
COUT 33
SLOUT 34
SROUT 35
SWOUT 36
AGND 37
DGND 38
LATCH 39
DATA 40
CLK 41
DVDD 42
N402
M62446
D+12V
C469
4.7u/16V
C470
4.7u/16V
C471
4.7u/16V
C472
4.7u/16V
C473
4.7u/16V
C4744.7u/16V
C475
4.7u/16V
C476
4.7u/16V
C477
822
C478
153
C479
334
C468
104
A+6V
R536
100k
R537
100k
R549
150
C497
100u/16V
C495
104
R548
100
R547
100
R546100
VD436
5.1V
C494 4.7u/16V
C493 4.7u/16V
C492 4.7u/16V
C491 4.7u/16V
C490 4.7u/16V
C489 4.7u/16V
C486
4.7u/16V
C485
4.7u/16V
C484
822
C483
153
C482
334
C487
104
TAPER
VCD L
CD R
VCD R
CD L
5.1CHR
5.1CHL
TAPEL
X0
12
X1
14
X2
15
X3
11
Y0
1
Y1
5
Y2
2
Y3
4
INH 6
A10
B9
VEE
7
X13
Y3
168
N401
CD4052
C464
47u/16V
R530
470
VD432
6.8V
VD431
6.8V R529
470
C462
47u/16V
-12V
+12V
R531
1k
R532
1k
REC R
REC L
C465
10u/16V
C466
10u/16V
R527
47k R528
47k
R5111k
R514
1k
R515
1k
R5181k
R522
1k
R5191k
R5231k
R526
1k
C
SW
SL
SR
R503150
R5061k
R5071k
R5101k
5
6
7
N403B
4558
3
2
1
84
N403A
4558
SW
LINEOUT
R
L
R533
100k
R534100k
A+6V
A-6V
R538
1.5M
C480
101
VD434
1N4148
C481
4.7u/16V
R539
150
R540
10k
R542
100k
R541
220
R501
150
R502
47k
5
6
7
N405B
4558
3
2
1
84
N404A
4558
5
6
7
N404B
4558
3
2
1
84
N405A
4558
R554
10k
R557
10k
R556
10k
R553
10k
R559
22k
R562
22k
C500
101
C498
101
+12V
+12V
-12V
-12V
R563
10k
R564
22k
R560
10k
R561
22k
C503
33P
C502
33P
SR-IN
SL-IN
C-IN
R
L
R543
1k R544
4.7k
SEARCH R565
47k
R566
47k
3
2
1
84
N406A
4558
-12V
+12V
R567
22k
C504
101
DISPLAY
C501
103
CLK
DATA
LATCH
A
B
R50447k
R50547k
R50847k
R50947k
R52447k
R52547k
R51247k
R51347k
R51647k
R51747k
R520
47k
R52147k
L404
100uH
D+5V L405
WBC
C496
47u/16V
D+5V
-12V
MIC
ToVFDBoard
R555
47k
R558
47k
R550
47k
R551
47k
R552
47k
C461
104
C463
104
R675
100k
R676
100k
R677
100k
R678
100k
R496
47k
R495
47k
R494
47k
R635
100k
R636
100k
C639
221
C538
4.7u/16V
R637
100k
R638
100k C641
221
C640
4.7u/16V
5
6
7
N407B
4558
5
6
7
N408B
4558
3
2
1
84
N407A
4558
3
2
1
84
N408A
4558
+12V
-12V
-12V
+12V
R640
56k
R642
56k
R639
56k
R643
56k
R644
75k
R645
75k
R641
47k
C642
101
C643
101
X0
12
X1
13
Y0
2
Y1
1
Z0
5
Z1
3
INH
6
A
11
B
10
C
9VEE 7
Z4
Y15
X14
VCC 16
Vss 8
N410
CD4053C
X0
12
X1
13
Y0
2
Y1
1
Z0
5
Z1
3
INH
6
A
11
B
10
C
9VEE 7
Z4
Y15
X14
VCC 16
Vss 8
N411
CD4053C
R664
100k
R665
100k
R663
100k
R666
100k
S-C
S-S
R657
1k
R655
1k
D-SW
S-C
S-S
R667
1k
R668
1k
D-SW
5
6
7
N406B
4558
C646
682
R659
75k
R660
47k C647
103
R661
47k
C648
10u/16V
R662
100k
V439
2N5401
R545
47
C488
47u/16V
C467
47u/16V
R535
47
A+6V
A-6V
A-6V
A+6V
A+6V
A-6V
A-6VSEL
SEL
R
L
C420
47u/16V
C421
47u/16V
S-SW
R679
680k
+12V
R658
1k
SEL1
C539
10u/16V
V446
9014
V4382N5551
A+6V
R499
4.7k
R498
2.2k
EX
C666
47u/16V
C667
47u/16V
R500
22k
MUT1
C499
103
MUT2
1
2
3
4
5
6
7
8
XS5
8PIN
MS
R568
10k
- 7 -
4.3.3 A/Dconversion and display output circuit: The output voltage from the pin 3 of
N419 passes throughN420B where it is amplified and sent to the opposite-phase
terminal of N420A.N420A composes a voltage comparer. We'll discuss its detailed
working process accordingthe voltage comparing characteristics (When the in-phase
end's voltage ishigher than that of the opposite-phase end, the output is the positive
power. Whenthe in-phase end's voltage is lower than that of the opposite-phase end,
the output isthe negative power.) and the figure 4.
When the opposite-phaseend has a DC voltage representing 35Hz signal amplitude,
the output ofN420A is a low level close to the negative power supply. At the same time,
+5V provides conditionsfor V436 to be conductive and a high level from the collector
of V436 chargesC530. The positive end's voltage of C530 (i.e. the in-phase end of
N420A) is increasinggradually. When the voltage reach that of the opposite-phase
end, the voltagecomparer will overturn. Therefore, N420 sends out a high level close
to the positivepower supply voltage. When the comparer overturns, CPU will
terminate the 35Hzlevel selection and switch to the next frequency 100Hz. During the
switch interval, aninstantaneous high level from the pin 1 of CPU makes V435
conductive and thevoltage of C530 will be released. The in-phase end of N420Awill
be charged from0 level to 100Hz. When 100Hz charge is finished, it will switchto the
next frequency. The process is circulated under CPU's control.The charging time from
the 0 levelto overturn represent current frequency's signal amplitude. The amplitude
is large, timeis longer; the amplitude is small, time is shorter. We can conclude from
the above circuitworking process: An analog series of DC level which has concrete
voltage value originallybecomes two mode of 0 and 1. Its time period represents the
digital pulse ofthe original information. That is to say, it finishesthe analog-to-digital
conversion process. The digital pulsesent out from the output terminal of N420A
reaches the pin12 of CPU after opposite-phased by V437. And then CPU processes
it and sendsit to front panel display IC N901 which will make dynamic spectrum
display on thedisplay. As a matter of fact, every frequency is displayed sequentially.
However, whatwe see on the display screen is the working process all thespectrums
are displayed simultaneouslydue to every frequency display circulate very quickly.
V
T
35HZ
100HZ
Switch time interval
V
T
35HZ 100HZ
Charge time Charge time
High level
discharge
(Figure 4)
- 20 -
127 CONNECTION
CORDS ¦µ
0.6 SHAPED 10mm
W4,W6,W7,W9,W13,W17,W23,W25,W29,W31,W32,W35,
W40,W41,W44~W47,W54,W55,W62,W65,W80,W90,W97,
W103,W111,W112,W117,W121,W122,W133,W137,W142,
W143,W154,W163,W167,W168,W174,W177,W178,W180,
W181,W185,W186,W190,W207,W208,W209,W37
128 CONNECTION
CORDS ¦µ
0.6 SHAPED 12.5mm
W57,W60,W67,W68,W70,W71,W77,W93,W104,
W120,W123,W124,W128,W130,W131,W144,W145,W148,
W204
129 CONNECTION
CORDS ¦µ
0.6 SHAPED 15mm W83,W85,W86,W107,W115,W126,W129,W146,W147,
W169~W173,W175,W176,W182,W183,W191,W201,W82
130 CONNECTION
CORDS ¦µ
0.6 SHAPED 20mm W33,W34,W48,W51,W114,W132,W134,W141,W166,W192,
W196,W200,W203
131 CABLE 20# 60mm BLACK WITH CHIP
SOLDER GROUND WIRE
132 CABLE 18# 70mm BLACK XJ1~XJ2
CABLE 22££
80mm BLACK XJ1~XJ2
133 FUSE TUBE T6.3AL 250V FL403,FL404
134 FUSE TUBE T4AL 250V FL405,FL401,FL402
135 FUSE HOLDER BLX-2 FL405
136 RADIATOR
BOARD 30×16×16 AB207 SRQ401
137 LARGE
RADIATOR 267.5×91×70 AV210 CONNECTED TO THE MAIN AMPLIFICATION BOARD
138 FUSE HOLDER 0FL401~FL404
139 SMALL CHIP AB207 FIX TRIODE
140 ANGLE
ALUMINUM 90×23.2×30 AV210 POWER IC / LARGE RADIATOR
141 TAPPING
SCREW BT 3×8 BLACK 2 FOR RADIATOR BOARD/MAIN AMPLIFICATION BOARD,
1 FOR N412/RADIATOR BOARD
142 TAPPING
SCREW PB 3×12H COLOR ZINC 2 FOR SMALL CHIP/LARGE RADIATOR, 5 FOR ANGLE
ALUMINUM/LARGE RADIATOR
143 TAPPING
SCREW PWT 3×8×8 COLOR ZINC 1 FOR MAIN AMPLIFICATION/RADIATOR, GROUNDED
144 TAPPING
SCREW BT 3×8H COLOR ZINC 1 FOR MAIN AMPLIFICATION/RADIATOR, 3 FOR ANGLE
ALUMINUM/POWER IC
145 MACHINE
SCREW PWM 3×16×8 COLOR ZINC 4 FOR POWER TUBE/LARGE RADIATOR
146 SCREW NUT M3
147 SCREW
SPACER ¦µ
3×7.2×0.5
148 SPRING
SPACER ¦µ
3
149 INSULATION
RING ¦µ
3×6×3 N413~N415
150 MICA SPACER 18×
13×
0. 1
151 MICA SPACER 22×
19×
0. 1 4 FOR POWER TUBE / RADIATOR
- 8 -
5. Microphone Circuit
The microphone circuitis divided into two parts: The Front Process Section and Echo
Process Section
5.1 Front SectionCircuit: Mainly performing volume adjusting/amplifying/modifying
function. The flow chart isshown as Figure 5.
MIC1
MIC2
V901
Following
Amplification
N904B
Voiced
Circuit
Echo
Process
Section
RP901
RP902
N903A
N903B
N904A
(Figure 5)
- 19 -
92
VOLTAGE
REGULATOR
DIODE
5.1V 1/2W VD436,VD411
93
VOLTAGE
REGULATOR
DIODE
12V 1/2W VD429
94
VOLTAGE
REGULATOR
DIODE
6.8V 1/2W VD431,VD432,VD438,VD439
95 TRIODE 2N5401 V404,V409,V410,V416,V421,V422,V440,V436,V439
96 TRIODE 2N5551 V401,V402,V403,V405~V408,V413,V414,V415,V417~V420,
V435,V437,V438
97 TRIODE 8050C V432,V445,V441,V442
99 TRIODE 9014C V426~V429,V431,V443,V444,V446
100 TRIODE 9015C V430
TRIODE S8550D V433
101 TRIODE KB688O V412,V424
TRIODE KB688Y V412,V424
102 TRIODE KD718O V411,V423
TRIODE KD718Y V411,V423
103 IC LM324N DIP N417,N418
104 IC NJM4558D DIP N403~N408,N420
IC 4558C DIP N403~N408,N420
105 IC L7812CV GOLD-SEALED TO-
220 N412
IC LM7812 GOLD-SEALED TO-
220 N412
106 IC CD4051 DIP N416,N419
107 IC CD4053BCN DIP N410,N411
108 IC CD4052BCN DIP N401
109 IC M62446FP SOP N402
110 IC 24C02 DIP N421
111 IC LM1875T T05B N413,N414,N415
112 SOFTWARE
PROGRAM CPU CPU-AV210(RU)-0 N422
113 CRYSTAL
OSCILLATOR 12.00MHz 49-U G601
114 RELAY JH1806-012-(3H1£«
1Z1) DC12V Y402
115 RELAY JH4237-012-2H DC12V Y401
116 PCB 4210-3
117 TERMINAL
SOCKET AV6-8.4-53 XC401
118 TERMINAL
SOCKET AV8-8.4-62 XC402
119 TERMINAL
SOCKET AV1-8.4-5 BLACK XC403
120 SOCKET 8 PINS 2.5mm XS5
121 SOCKET 9 PINS 2.5mm XS4
122 SOCKET 2 PINS 7.92mm XS1,XS2
123 SOCKET 6 PINS 3.96mm XS3
124 CONNECTOR'S
SOCKET WP4-10A XL401
125 CONNECTOR'S
SOCKET WP6-10A XL402
126 CONNECTION
CORDS ¦µ
0.6 SHAPED 7.5mm
W1~W3,W5,W8,W10~W12,W14~W16,W18~W22,W24,
W26~W28,W30,W36,W38,W39,W42,W43,W49,W50,W52,
W53,W56,W58,W59,W61,W63,W64,W66,W69,W72~W76,
W78,W79,W81,W84,W87~W89,W91,W92,W94~W96,
W98~W102,W105,W106,W108~W110,W113,W116,
W118,W119,W125,W127,W135,W136,W138~W140,
W149~W153,W155~W162,W164,W165,W179,W184,
W187~W189,W193~W195,W197~W199,W205,W206
- 9 -
5.2 Echo ProcessSection
The flow chartis shown as Figure 6. The front section signal is divided into three lines:
One line issent by R980 and C958 to N403B's opposite-phase end. This line is just the
signal search anddetect circuit we have mentioned before. When the front section
circuit of themicrophone has signal output, the auto-search mode will be stopped.
Another line ofsignal is sent directly after being coupled by R946 and C926. This line is
the stereo channelof the echo channels. The third line is the feedback channel which is
coupled by R947,C927, C928 and R948 and then sent to the echo process ICN905's
th
16 pin. The line is LPFamplified and digitally delayed and then sent out from the pin 14.
The RP 903 connected tothe pin 6 is the echo delay adjustment potentiometer. The pin
14's signal iscoupled by R951 and R952 into two lines: I¢Ùt i scoupl edbyt heC932and
R976andf edbackt ot hei nput t er mi nal of t hepi n16. I ¢Út i scoupl edbyC942&R960
andi t sechol evel i sadj ust edbyRP904.Theni t i sampl i f i edbyt heampl i f i cat i onci r cui t
composedbyV902.Theampl i f i edsi gnal i ssent out f r omt hecol l ect or of t heV902and
t hencoupl edbyR968andC946. Fi nal l yt hesi gnal mi xeswi t ht hest er eochannel si gnal
andmakesupof acompl et eKar aokesi gnal . Thi sKaraok esi gnal i ssent out t ot he
opposi t e- phaset er mi nal of N404Bandover l apswi t hL&Rchannel s. Thent hemi xed
si gnal r eachest hepower ampl i f i cat i onci r cui t t obeampl i f i ed. TheKar aokesi gnal
out put endi sal soconnect edt ot hemut eswi t chi nsi det hemi cr ophonesocket . When
t hemi cr ophonei snot i nser t ed, t hecont act chi pi sgr oundedandt hemi cr ophoneci r cui t ' s
noi sei sf i l t er edbyt heshor t ci r cui t . Whent hemi cr ophonei si nser t ed, t hecont act chi pi s
cut of andt hemi cr ophoneci r cui t hasnor mal out put .
N905
PT2399
Echo
Processing
Automatic
Search & Detect
Circuit
V902
AMP
N404B
¡¢
N405B
Mix with
the channels
L & R
N904B .
.
..
RP903
RP904
(Figure 6)
OK¡ª
MUTE
- 18 -
59 PORCELAIN
CAPACITOR 50V 683 ±10£¥
5mm C521,C522
60 PORCELAIN
CAPACITOR 50V 154 +80%-20% 5mm C527,C528
PORCELAIN
CAPACITOR 100V 104±20£¥
5mm C412,C414,C402,C404,C458,C459,C434,C460
61 TERYLENE
CAPACITOR 100V 104 ±10% 7mm C423,C428,C433,C436,C438
62 TERYLENE
CAPACITOR 100V 224 ±10% 8mm C444,C445
63 TERYLENE
CAPACITOR 100V 472 ±5% 3.5mm C646
TERYLENE
CAPACITOR 63V 104 ±5% 5mm C446,C448
64
METAL
POLYESTER
FILM
CAPACITOR
CL21X 63V 153 ±5% 5 C478,C483
65
METAL
POLYESTER
FILM
CAPACITOR
CL21X 100V334±10% 7.5 C479,C482
66
METAL
POLYESTER
FILM
CAPACITOR
CL21X 100V 104 ±10£¥
5 C530
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68 CD CD11 16V22U±20%5×11 2 C427,C432,C422
69 CD CD11 16V47U±20%5×11 2 C420,C421,C464,C462,C467,C488,C505,C506,C535,C452
C666~C669,C453,C454,C496,C665
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71 CD CD11 50V2.2U±20%5×11 2 C511,C514,C517,C523
72 CD CD11 50V4.7U±20%5×11 2 C424,C426,C670,C671
73 CD CD11 25V100U±20%6×12 2.5 C441
74 CD CD11 25V220U±20%8×12 3.5 C439,C440
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78 CD CD11 16V1U±20%5×11 2 C435,C437
79 CD CD11 16V4.7U±20%5×11 2 C469~C476,C481,C485,C486,C489~C494,C538,C640
CD CD110 35V3300U±20%16×35 7.5 C442,C443
CD CD11C 50V2.2U±20%4×7 1.5 C520,C526,C529
80 CD LUA 50V6800U±20%30×50 10 C447,C449
83
MAGNETIC
BEADS
INDUCTANCE
W4B WBC 6×10-1.5T L405
MAGNETIC
BEADS
INDUCTANCE
100UH ±10% 0410 VERTICAL
10mm L404
INDUCTANCE 47UH ±10% 0410 VERTICAL
10mm L406
84 INDUCTANCE
COIL 0.7UH SC-0.8×8.0×11.5 L401,L402
85 CHOKE COIL UU10.5-1.8mH L403
86 DIODE 1N4004 VD409
87 DIODE 1N4148 VD440~VD446,VD448,VD449,VD450,VD401,VD402,VD405,
VD406,VD415~VD417,VD419,VD420,VD434,VD412
88 DIODE RL254 VD421~VD424
89 DIODE 1N5404 VD425~VD428
90
VOLTAGE
REGULATOR
DIODE
3.3V 1/2W VD447
91
VOLTAGE
REGULATOR
DIODE
4.7V 1/2W VD410
- 10 -
6. PowerAmplification and Protection Circuit
6.1. Channels L&RPower Amplification Circuit: The L&R power amplifier employs
separate components. Takingthe L channel as anexample, its construction is shown
in Figure 7.
Differential
AMP Section
V401,V402
Voltage
AMP
Section
V404
Mirror Image
Constant Source
V403,V406,VD401,VD402
L Input
Temperature
Compensation
Section
V405
Compound
Power AMP (PNP)
V409,V410,V412
Compound
Power AMP (NPN)
V407,V408,V411
Speakers
AC Negative
Feedback
R419,R410,C407
.
(Figure 7)
.
V440
V441
Mute
The L channel signal is sent to thepower amplification section by the electronic volume
adjusting circuit.A mute circuit installed in the input end. When press theMUTE button
on the remotecontrol, a high level mute command is sent from the pin 1of the electronic
volume adjusting ICN402. It makes V440 and V441 conductive to finish the mute control
function.
The L channel signal is coupled by theR403&C405 and sent to the base of the differential
AMP section V401. V401 andV402 compose the single-end input/output differential
amplification circuit. The audio signalis sent from the collector of V401 to the base of the
voltage amplification sectionV404 where its voltage is amplified and sent tothe
compound power amplificationsection. V403, V406, VD401 and VD402 compose mirror
image constant circuit.VD401 and VD402 provide constant base current for V403and
V405. V403's emitterresistor defines the current of the differential amplification section.
V406's emitter resistordefines the current of the voltage amplification section.
V407, V408 andV411 make up the NPN of compound power amplifier. V407 and V408are
parallel connected. Their function equalsa triode (able to amplify power). Then they mix
with V411 to constitute NPN compound tube(capable of enhance amplification times).
V409, V410 andV412 constitute the PNP of the compound amplifier. Its circuit
construction is thesame as NPN. The temperature compensation section V405 has two
functions in thecircuit: First it is a biasing of the NPN and PNP. Its working status defines
the static workingcurrent of the compound power amplification section. That is to say,
we can adjustthe inductance degree of V405 to define the static working point ofthe
compound power amplificationsection. The usual way is to adjust the base resistor of
V405. It canalso automatically adjust the working status of the compound power
amplification section whenthe temperature rises.
6.2 C, SRand SL power amplification circuit:These three channels employ the
exclusive power amplifierIC LM1875 (or TDA2030). It has five pins and is a good power
amplifier IC. The application circuitis very simple. It has 15W power output in the rated
condition. The pins 5 &3 are the positive/negative power supplying pins and employ
2¡À2V.Thepi n1i st hesi gnal i nput t er mi nal . Thepi n2i st hef eedbacki nput t er mi nal .
Thepi n4i st heout put t er mi nal .
- 17 -
30 CD CD11 25V220U±20%8×12 3.5 C415,C416
31 CD CD11 35V470U±20%10×20 5 C423,C424
32 CD CD11 50V1U±20%5×11 2 C411,C412
33 CD CD11 50V10U±20%5×11 2 C435,C436,C437,C438,C417
34 CD CD11 35V47U±20%6×12 2.5 C439,C440,C441,C442
35 CD CD11 35V100U±20%8×12 3.5 C418
36 CD LUA 35V6800U±20£¥
30×45 10 C421,C422
37 DIODE 1N4004 VD407,VD408,VD419
38 DIODE 1N4148 VD401~VD406,VD418
39 DIODE 1N5404 VD410~VD413
40
VOLTAGE
REGULATOR
DIODE
12V 1/2W VD415,VD414,VD409
41
VOLTAGE
REGULATOR
DIODE
6.8V 1/2W VD417,VD416
42 TRIODE 2N5401 V404,V408,V414,V418,V429,V431,V433
43 TRIODE 2N5551 V401,V402,V403,V405,V407,V411~V413,V415,V417,
V428,V430,V432
44 TRIODE 9014C V406,V416,V421,V422,V423,V424,V426,V427,V434,V4
35
45 TRIODE 9015C V425
46 TRIODE KB688O V410,V420
TRIODE KB688Y V410,V420
47 TRIODE KD718O V409,V419
TRIODE KD718Y V409,V419
48 IC CD4052BCN DIP N401
49 RELAY JH4237-024-2H DC24V Y401,Y402
50 PCB 4217£-
3
51 TERMINAL
SOCKET AV6-8.4-3B XC2
52 TERMINAL
SOCKET AV4-8.4-3B XC1
53 SOCKET 3 PIN 2.5mm XS3,XS4
54 SOCKET 6 PIN 2.5mm XS5
55
SOCKET FOR
EXTERNAL
CORDS
WP6-1B XL1
56 POLE SOCKET WP4-10A XC3
57 CONNECTION
CORDS ¦µ
0.6 SHAPED 7.5mm W29,W32,W35,W36,W39,W48,W54,W58,W13
58 CONNECTION
CORDS ¦µ
0.6 SHAPED 10mm W10~W12,W15,W19~W21,W27,W31,W33,W34,
W37,W43,W44,W47,W51,W53,W55
59 CONNECTION
CORDS ¦µ
0.6 SHAPED 12.5mm W14,W16,W49,W50,W56
60 CONNECTION
CORDS ¦µ
0.6 SHAPED 15mm
W5,W7,W17,W18,W22,W23~W26,W28,W30,W45,W46
,
W40,W41,W52
61 CONNECTION
CORDS ¦µ
0.6 SHAPED 20mm W38,W42,W57
62 FUSE TUBE T6.3AL 250V FL401,FL402
63 LARGE
RADIATOR 204×80×61 AB217 CONNECT TO THE MAIN AMP BOARD
64 FUSE HOLDER 0FL401,FL402
65 SMALL CHIP AB207 FIX THE TRIODES V406 AND V416
66 TAPPING SCREW PB 3×12H COLOR ZINC 2 FOR SMALL CHIP AND LARGE RADIATOR
67 TAPPING SCREW PWT 3×8×8 COLOR ZINC 2 FOR PCB/RADIATOR
68 MACHINE
SCREW PWM 3×16×8 COLOR ZINC 4 FOR POWER TUBE / LARGE RADIATOR
69 SCREW NUT M3 POWER TUBE SCREW
70 SCREW SPACER ¦µ
3×7.2×0.5 POWER TUBE SCREW
71 SPRING SPACER ¦µ
3POWER TUBE SCREW
72 MICA SPACER 24×20×0.1 4 FOR POWER TUBE / LARGE RADIATOR
- 11 -
6.3 Protection circuit:This unit incorporates the power-saving function. The L/R
channel's protection isperformed by cutting off the relay Y401 to cut off the 3¡À6Vpower
suppl ywhent hi suni t i sget t i ngst ar t ed. C, SRandSLchannel spr ot ect i oni sper f or med
bycut t i ngof f t her el ayY402t ocut of f t heout put t er mi nal . Thei r cont r ol t er mi nal sar e
connect ed, sot her ear enoout put f r omt hef i vechannel swhenpr ot ect i ngt hi suni t ' s
st ar t - up. Thi suni t empl oysf our pr ot ect i onf unct i ons.
6. 3. 1St ar t - upDel aySwi t ch- onPr ot ect i onCi r cui t : Becauset heci r cui t i snot st abl ewhen
t hi suni t i sget t i ngst ar t edandt hei ncur r edi mpact cur r ent i sver yhar mf ul t ot hespeaker s
andpower ampl i f i cat i onci r cui t , sot hedel ayswi t ch- onci r cui t i spr ot ect ed. Whent hi s
uni t i sget t i ngst ar t ed, +22Vpassest hr oughR484t ochar geC441. Theposi t i veend
vol t ageof C441get t i nghi gher gr adual l y. Wheni t sur passes5. 1V,VD411i spenet r at ed.
I t sposi t i vehi ghl evel i saddedt ot hebaseof t hecompoundt ubecompr i si ngV444&V445
andV443&V442. Theset wocompoundt ubeget conduct edandt her el aysY402and
Y401ar eswi t chedon, sot hi suni t hasnor mal out put . Thest ar t - updel ayswi t ch- ont i me
dependsont heconst ant of char gi nganddi schar gi ngf r omR484t oC441.
+22V ChargingC441
Through R484
Penetrate
VD411
V444
¡¢
V445
conducted
V443
¡¢
V442
conducted
Y402switched on
Y401switched on
Normal
output
Defines delay time
6.3.2 Power-saving Control:When press the POWERSAVING button on the front
panel and
Pin 2 of CPU VD419 V413 conducted V430conducted
Relay shut off.
Enter power-saving
mode.
remote control, thepin 2 (E OX) of theCPU sends outa high level.It passes through
VD419 and reachesto the baseof V431. WhenV431 is conducted,V430 is also
conducted. Therefore, the positive end voltage of C441 is decreasing, VD411 is stopped.
The relays Y402 and Y401 are cut off, this unit enters the power-saving mode. At the
same time, theCPU sends outdata demands tothe front paneldisplay IC andthen this
unit enters thepower-saving mode.
6.3.3 Mid-point Over-voltageProtection: Anover-voltage sampling resistor is
connected to theevery channel's output.The channel L's is R478. When there is one
output mid-point DCvoltage which ishigher than +3.5Vor lower than3.5V, V429 and
V428 are conducted.Their base voltage will decrease and V430 is conducted. Atlast,
the relay switchesoff and the protection circuitis getting started.
One
over-voltage
sampling
resistor is
connected to
every
R478
connected
toL
channel
Above+3.5V
Below +3.5V
V429
conducted
V428 conducted
Collector s
voltage
decreases V430
conducted
Relay switched
off.
Protection
started up.
- 16 -
2. THE MAIN AMP PART
MAIN PARTS LIST OF THE MAIN AMPBOARD
NO. DESCRIPTION SPECIFICATIONS/PART NO. LOCATION SPECIFICATIONS
1CARBON-FILM
RESISTOR 1/6W10¦¸
±5% SHAPED 7.5 R417,R418,R422,R423,R444,R445,R449,R450
2CARBON-FILM
RESISTOR 1/6W100¦¸
±5% SHAPED 7.5 R546~R548,R541
4CARBON-FILM
RESISTOR 1/6W1K±5% SHAPED 7.5
R506,R507,R510,R511,R514,R515,R518,R519,R522,R523,
R526,R529~R532,R543,R655,R657,R658,R667,R403,
R410,R430,R437,R412,R439,R479,R580,R586,R591,R596,
R601,R606,R611,R616,R619,R622,R626,R570,R575,R686,
R497,R457,R461,R465
5CARBON-FILM
RESISTOR 1/6W1.5K±5% SHAPED 7.5 R577
6CARBON-FILM
RESISTOR 1/6W2.2K±5% SHAPED 7.5 R625,R578,R689,R493,R498
7CARBON-FILM
RESISTOR 1/6W4.7K±5% SHAPED 7.5 R544,R628,R499,R690,R685,R691,R428,R576,R587,R607,
R602,R612,R617,R592,R597,R480,R483,R453,R454,R455
8CARBON-FILM
RESISTOR 1/6W5.6K±5% SHAPED 7.5 R584,R589,R594,R599,R604,R609,R614,R627
9CARBON-FILM
RESISTOR 1/6W10K±5% SHAPED 7.5
R581,R583,R588,R593,R598,R603,R608,R613,R620,R623,
R624,R579,R629,R540,R554,R557,R560,R563,R487,R481,
R485,R553,R556,R401,R426,R429,R568,R641
10 CARBON-FILM
RESISTOR 1/6W20K±5% SHAPED 7.5 R661
11 CARBON-FILM
RESISTOR 1/6W22K±5% SHAPED 7.5 R500
12 CARBON-FILM
RESISTOR 1/6W27K±5% SHAPED 7.5 R574,R458,R462,R466
13 CARBON-FILM
RESISTOR 1/6W33K±5% SHAPED 7.5 R446,R419
14 CARBON-FILM
RESISTOR 1/6W47K±5% SHAPED 7.5
R502,R527,R528,R550,R551,R552,R555,R558,R660,
R404,R431,R504,R505,R508,R509,R512,R513,R516,R517,
R520,R521,R524,R525,R682~R684,R536,R537,R663,R664,
R665,R666,R567
15 CARBON-FILM
RESISTOR 1/6W100K±5% SHAPED 7.5 R635,R636,R637,R638,R662,R618,R565,R566,R494~R496,R542
CARBON-FILM
RESISTOR 1/6W1M¦¸
±5% SHAPED 7.5 R534
16 CARBON-FILM
RESISTOR 1/4W47¦¸
±5% SHAPED 10 R535,R545
17 CARBON-FILM
RESISTOR 1/4W100¦¸
±5% SHAPED 10 R420,R421,R447,R448
18 CARBON-FILM
RESISTOR 1/4W4.7K±5% SHAPED 10 R414,R441,R486,R680
19 CARBON-FILM
RESISTOR 1/4W33K±5% SHAPED 10 R411,R438
20 CARBON-FILM
RESISTOR 1/4W47K±5% SHAPED 10 R478,R482
21 CARBON-FILM
RESISTOR 1/4W1M¦¸
±5% SHAPED 10 R533,R675,R678
22 CARBON-FILM
RESISTOR 1/6W18K±5% SHAPED 7.5 R559,R561,R562,R564
23 CARBON-FILM
RESISTOR 1/6W75K±5% SHAPED 7.5 R571,R644,R645,R659
24 CARBON-FILM
RESISTOR 1/4W2K±5% SHAPED 10 R415,R442,R688
25 CARBON-FILM
RESISTOR 1/6W150¦¸
±5% SHAPED 7.5 R501,R503,R539
26 CARBON-FILM
RESISTOR 1/2W220¦¸
±5% SHAPED 12.5 R692~R695
CARBON-FILM
RESISTOR 1/6W2.2M¦¸
±5% SHAPED 7.5 R679
27 CARBON-FILM
RESISTOR 1/6W2.7K±5% SHAPED 7.5 R472,R476,R405,R406,R432,R433,R470,R471,R474,R475
COMPONENTS LIST FO THE MAIN AMPLIFICATION BOARD
- 12 -- 15 -
6.3.4 Over-current shortcircuit protection: An over-current resistor sampling triode is
parallel connected tothe output load resistor of the channels L&R respectively. The
channel L's samplingtube is V426 and its load resistor is R424 and R425.Another three
channel power amplificationIC have over-current protection function. When over-current
fault occurs tothe L or R channel, the potential betweenR424 and R425 will increase
sharply. When it supersedes0.7V, V426 will get conducted. So willv430. Finally, the
relay is switchedoff and the protection circuit is getting started.
Over-current
Sampling triode
connected to
every channel
Channel
L s is
V426
Collector s
voltage
decreases
V430
Conducted
R424 ¡¢ R425
over-current.
Potential
increases.
V426
conducted
Relay swit ched
off.
Protection
started up.
¢ò. I NSTRUCTI ONSTOTHECI RCUI TS1 . THE FRONT CONTROLP ANEL MAI NPARTSLI STOFTHEFRONTCONTROLPANELBOARD
NO. DESCRIPTION SPECIFICATIONS/PART NUMBER LOCATION SPECIFICATIONS
1CARBON-FILM
RESISTOR 1/6W100¦¸
±5% SHAPED 7.5 R905,R906,R910,R907
2CARBON-FILM
RESISTOR 1/6W560¦¸
±5% SHAPED 7.5 R959
3CARBON-FILM
RESISTOR 1/6W1K±5% SHAPED 7.5 R919,R921,R924,R926,R967,R952,R923,R928
4CARBON-FILM
RESISTOR 1/6W1.5K±5% SHAPED 7.5 R933,R951
5CARBON-FILM
RESISTOR 1/6W4.7K±5% SHAPED 7.5 R916,R970,R971,R972,R938,R961
6CARBON-FILM
RESISTOR 1/6W10K±5% SHAPED 7.5 R955,R956,R960,R965,R930,R931,R943,R947,R949,
R950,R953,R968,R901~R904,R911~R914,R980
7CARBON-FILM
RESISTOR 1/6W12K ±5% SHAPED 7.5 R958,R957,R964
8CARBON-FILM
RESISTOR 1/6W22K±5% SHAPED 7.5 R969,R941,R935
9CARBON-FILM
RESISTOR 1/6W47K±5% SHAPED 7.5 R920,R922,R925,R927,R929
10 CARBON-FILM
RESISTOR 1/6W100K±5% SHAPED 7.5 R932,R963
11 CARBON-FILM
RESISTOR 1/6W15K±5% SHAPED 7.5 R954,R966,R946,R976,R977,R978,R940
12 CARBON-FILM
RESISTOR 1/6W3.3K±5% SHAPED 7.5 R948
13 CARBON-FILM
RESISTOR 1/6W220K±5% SHAPED 7.5 R962
14 CARBON-FILM
RESISTOR 1/6W30K±5% SHAPED 7.5 R936,R942
15 CARBON-FILM
RESISTOR 1/6W8.2K±5% SHAPED 7.5 R937,R939,R934
16 CARBON-FILM
RESISTOR 1/2W100¦¸
±5% SHAPED 12.5 R915
CARBON-FILM
RESISTOR 1/6W56K±5% SHAPED 7.5 R908
17 CARBON-FILM
RESISTOR 1/6W47¦¸
±5% SHAPED 7.5 R909
18 CARBON-FILM
RESISTOR 1/6W470K±5£¥
SHAPED 7.5 R944
19 Rotating
Potentiometer A115NOED-H1B503-007 RP903,RP904
20 Rotating
Potentiometer R1111NOA-V1C503FK00-01 RP901,RP902
21 Digital
Potentiometer
E1611A3A-V1FG05-01 WITH
SPACER RP905
COMPONENTS LIST OF THE FRONT PANEL
3
2
1
84
N903A
NJM4558
5
6
7
N903B
NJM4558
3
2
1
84
N904A
NJM4558
R921
1k
R926
1k
R922
47k
R934
8.2k
C921
82P
C942
4.7u/16V
R927
47k
-12V
RP904
B50k
C932
4.7u/16V
-12V
+12V C930
562
R948
3.3k R976
15K
C928
4.7u/16V
5
6
7
N904B
NJM4558
R9398.2k
C922
123
R941
22k
R942
30k
C923
471
+12V
R968
10k
R953
10k
C924
104
C916
82P
C918
82P
R932
100K
R635
22k
R933
1.5K
R960
10K
R943
10k
R940
15k R944
470k
C925
82P
R936
30k
R938
4.7k R947
10k
C927
4.7u/16V
C943
4.7u/16V
V902
9014
R964
12k
R965
10k
R966
15k
C944
10u/16V
R962
220k
R963
100k
C946
4.7u/16V
+12V
R937
8.2k
C919
4.7u/16V V901
9014
R929
47k
R930
10k
R931
10k
C920
4.7u/16V
+12V
-12V
C945
470u/16V
VD909
1N4148
R967
1k
R961
4.7k
R949
10k
C933
823
R954
15K
C935
562
C937
104
C931
103
C929
561
R955
10K
RP903
B50k
R951
1k
R956
10K
C939
47u/16V
R958
12k
C938
104
R950
10k
C936
823
VCC
1
REF
2
AG
3
DG
4
CLK
5
VCO
6
CC1
7
CC0
8P1-O 9
P1-I 10
P2-I 11
P2-O 12
F2-I 13
F2-O 14
F1-O 15
F1-I 16
N905
PT2399
R957
12k
C940
104
C934
561
R928
1k
R923
1k
R924
1k
R919
1k
RP902
C50K
MIC1
MIC2
FromMIBoard
RP901
C50K
GND
K-M
C915
10u/16V
C917
10u/16V
R920
47k
R925
47k
C941
47u/16V
VD910
5.6V
R959
560
+12V
R952
1k
R946
15k
C926
4.7u/16V R969
22k
+12V
-12V
MIC
ToAMPBoard
1
2
3
4
5
6
7
8
XP5
8PIN
D+5V
C947
47u/16V
C948
47u/16V
1
2
3
4
XP6
4PIN
V904
2N5551
R980
10k
C958
4.7u/16V
C951
103
C952
103
C953
47u/16V
C954
47u/16V
+12V +12V
-12V -12V
C955
104
C956
104
R977
15k
R978
15k
- 13 - - 14 -
22 PORCELAIN
CAPACITOR 50V 82P ±10% 2.5mm C916,C918,C921,C925
24 PORCELAIN
CAPACITOR 50V 221 ±10% 2.5mm C959,C960,C961
25 PORCELAIN
CAPACITOR 50V 561 ±10% 2.5mm C929,C934
26 PORCELAIN
CAPACITOR 50V 103 ±20% 2.5mm C906,C907,C909,C910,C951,C952,C931
27 PORCELAIN
CAPACITOR 50V 562 ±20% 2.5mm C930,C935
28 PORCELAIN
CAPACITOR 50V 471 ±10% 2.5mm C923
29 PORCELAIN
CAPACITOR 50V 104 ±10% 5mm C902,C903,C912,C937,C938,C940,C955,C956
30 PORCELAIN
CAPACITOR 50V 823 ±10£¥
5mm C933,C936
31
METAL
POLYESTER
FILM
CAPACITOR
CL21X 100V 104 ±10£¥
5 C924
32 TERYLENE
CAPACITOR 100V 123 ±5% 5mm C922
33 CD CD11 16V47U±20%5×11 2 C953,C954
34 CD CD11 16V470U±20%8×123.5 C945
35 CD CD11C 50V4.7U±20%4×7 1.5 C926,C946,C927
36 CD CD11 16V4.7U±20%5×11 2 C920,C928,C932,C942,C943,C919,C958
37 CD CD11C 16V10U±20%4×7 1.5 C915,C917,C944
38 CD CD11C 16V47U±20%5×7 2 C939,C947,C948,C941,C901,C911
39 CD CD11 35V47U±20%6×12 2.5 C904
40 CD CD11 35V100U±20%8×12 3.5 C905
41 DIODE 1N4004 VD908
42 DIODE 1N4148 VD901~VD905,VD909
43
VOLTAGE
REGULATOR
DIODE
30V 1W VD907
44
VOLTAGE
REGULATOR
DIODE
5.6V 1/2W VD906,VD910
45 TRIODE 2N5551 V904
46 TRIODE 9014C V901,V902
47 IC NJM4558D DIP N903,N904
IC 4558C DIP N903,N904
48 IC PT2399 DIP N905
49 IC D16311GC QFP N901
50 VFD GTD-1501A VFD901
51
LIGHT TOUCH
RESTORE
SWITCH
HORIZONTAL 6×6×1 S901~S920
52 PCB 9210-3
53 CONNECTION
CORDS ¦µ
0.6 SHAPED 7.5mm W1,W3,W4,W6,W9~W14,W19,W21,W25~W27,W29,W30,
W35,W36,W32
54 CONNECTION
CORDS ¦µ
0.6 SHAPED 10mm W7,W16,W20,W22,W23,W24,W33
55 CONNECTION
CORDS ¦µ
0.6 SHAPED 12.5mm W8,W17,W18,W28,W31,W34
56 RAFT CORDS 3P60 2.5 2 PLUG WITH DOUBLE
NEEDLES XP7
57 RAFT CORDS 5P60 2.5 2 PLUG WITH L NEEDLE /
SM HEAD XP8
58 RAFT CORDS 8P200 2.5 T2 2P SHIELD WITH L
NEEDLE, 4 GROUND PINS XP5
59 RAFT CORDS 9P330 2.5 2 PLUG WITH L NEEDLE XP4
60 RAFT CORDS 4P60 2.5 2 PLUG 3P SHIELD WITH
L NEEDLE XP6
61 INFRARED
SENSOR HS0038B N902
62 SOFT SPONGE
SPACER 10×10×10 DOUBLE FACED, HARD N902/PCB
63 SOFT SPONGE
SPACER 10×10×5 DOUBLE FACED, HARD VFD901/PCB
SCHEMATIC DIAGRAM OF THE FRONT CONTROL PANEL BOARD
SW1
1SW2
2SW3
3SW4
4DOUT
5DIN
6NC
7CLK
8STB
9K1
10K2
11K3
12K4
13
VDD
14 SG1/KS1
15 SG2/KS2
16 SG3/KS3
17 SG4/KS4
18 SG5/KS5
19 SG6/KS6
20 SG7/KS7
21 SG8/KS8
22 SG9/KS9
23 SG10/KS10
24 SG11/KS11
25 SG12/KS12
26
SG13/GR1627
SG14/GR1528
SG15/GR1429
SG16/GR1330
SG17/GR1231
SG18/GR1132
VDD33
VEE34
SG19/GR1035
SG20/GR1036
GR837
GR738
GR639
GR5 40
GR4 41
GR3 42
GR2 43
GR1 44
VDD 45
LED5 46
LED4 47
LED3 48
LED2 49
LED1 50
GND 51
OSC 52
N901
UPD16311
S901
S902
S903
S906
S907
S908
S911
S912
S913
S914
S916
S917
S918
S919
R904
10k
R903
10k
R902
10k
R901
10k
D+5V
volume
1
32
N902
HS0038A2
REMOTE
C911
47u/16V
R908
47k
C903
104
C907
103
C906
103
VD901
1N4148
VD902
1N4148 VD903
1N4148 VD904
1N4148
1
2
3
RP901
DATA
CLK
STB
F2 F1
R910
100
R909
47
S904
S909
S905S910S915S920
VD905
1N4148
R911
10k
R912
10k
F
1F
2
NOP
3G1
4G2
5G3
6G4
7G5
8G6
9G7
10G8
11G9
12G10
13G11
14G12
15G13
16G14
17G15
18NOP
19NOP
20NOP
21NOP
22NOP
23NOP
24NOP
25NOP
26NOP
27NOP
28NOP
29NOP
30P1
31P2
32P3
33P4
34P5
35P6
36P7
37P8
38P9
39P10
40P11
41P12
42P13
43NOP
44
F
45F
46
AB215-1
VFD901 GTD-1501A
-30V
C912
104
R905
100
R906
100
R907
100
C901
47u/16V
C902
104
1
2
3
4
5
6
7
8
9
XP4
9PIN
1
2
3
XP7
3PIN
R913
10k
R914
10k
C909
103
C910
103
K-MUT
ToAMPBoard
ToP.M.Board
1
2
3
4
5
XP8
5PIN
F2
VD908
1N4004
C905
100u/35V
R915
56/0.5W
C904
47u/35V
VD907
30V
VD906
5.6V
R916
4.7k
FromTRANS
R970
4.7k R971
4.7k R972
4.7k
D+5V
R978
1k
VD912
5R3HD
D+5V
C959
221
C960
221
C961
221
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