BBK AV230 SERVICE MANUAL

Principle, Knowledge and Maintenance of

AV230 (RU)

Contents

Chapter One Product Description
Chapter Two Operating Principle

Section One Structure
Section Two Volume Board
Section Three Signal Processing Board
Section Four CPU Board
Section Five Control Panel
Section Six Voice Board
Section Seven Power Panel
Section Eight Power Amplifier Board and Protection Circuit

Chapter Three Maintenance Process

Chapter One Product Description

AV230 (RU) is an intelligent premium power amplifier that adds touch button
and voice navigation to its predecessor, allowing it to have a handsome and
distinguished appearance as well as a complete man-machine interaction mode that
facilitates user operation. Its main characteristics are as follows:

1. Built-in 5-channel power amplifier that can adapt to AC -3/DTS and stereo

music playback. 110W main channel and central surround sound.

2. Mix of AC-3/DTS, VCD and DVD. AUX input interface and super

bass/stereo output interface.

3. 6-channel volume control and independent level control. 7-stage electronic

balance.

4. Bass enhancer system, cyber logic, hi-fi playback.

5. One button for movie, music and karaoke.

6. Intelligent voice navigation.

7. Multiple electronic balance modes that adapt to different music styles.

8. Automatic spectrum analysis and compensation, automatic signal

compensation.

9. Profile surround sound. Situation effect processing for AC -3/DTS effect.

10. Multiple spectrum display modes.

11. Complete karaoke function including microphone independent volume

control, overall volume control, and voice compensation, delay and echo adjustment.

12. Karaoke wide sound field function.

13. Touch control function.

14. Intelligent protection upon overcurrent and over voltage .

Chapter Two Operating Principle

Section One Structure

AV230 (RU) mainly consists of the following seven parts:

I. Volume Board: select input of signal source, cyber logic , and bass enhancer control.
II. Signal Processing Board: karaoke signal processing and 5.1-channel signal
amplification.
III. CPU Board: overall control, frequency point gating, automatic search circuit.
IV. Control Panel: VFD display, touch selection and backlight display.
V. Voice Board: intelligent voice navigation system, operating mode indicated by voice
VI. Power Panel and Protection Circuit: provide operating voltage required by element
circuits and execute overall protection.

VII. Power Amplifier Board: power amplification of 5.1 channel signal or analog signal.

switc

SL

Section Two Volume Board

AV230(RU) has four input modes: AUX., VCD, DVD and 5.1 channel.

The cyber logic function of AV230 (RU) is to get C/SR/SL/SW channel signals by
sampling from L/R channel and then processing through low-pass filter and adder
subtractor . Mode switch is achieved using electronic analog switch. The signal flow chart is
as follows:

AUX

DVD

5．1CH

CD4052

electron

ic

switch

N107B
N105B

N105A

L
R

N104A

N104B

N106

M62446

OUT

N107A

SWIN

S-C

C

SR

S-SR

S-SL

CD
4053

electr

onic

S-C

CD
4053

N108B

DISPLY

electr

SW

onic

switc

h

I. Input option and sound field processing mode

The input option of AV230 (RU) is achieved via electronic switches CD4052 and
CD4053, the truth tables of which are as follows:

5.1 channel input mode: Now A/B/5.1CH control pins of M62446 are of high level.

L/R channel signal o f 5.1 input is outputted from pin 3/13 of N101 and sent to IC N106 for

volume and tone control; meanwhile, C/SR/SL signal on 5.1 input terminal is respectively

key to select

analog

input

mode

mode

sound

logic

channel output

only. Sound filed and

output only.

ed 6-channel output.

T

heater sound filed and

channel output.

T

heater sound filed and

sent from pin 14/15/4 output of N410 to IC N106 for independent volume control. And SW
signal is outputted via pin 4 of N103 and then send to M62446 after being amplified by
N107A.

Three analog input modes: AV230 (RU) totally has three analog input modes:
AUX/VCD/DVD, which are controlled via A/B signal respectively (see details in truth
tables).

AV230 (RU) totally has three sound field modes: standard sound field, cyber logic and

Hi-Fi.

1. Standard sound field: Under overall CPU control, when bass enhancer is off, L/R
channel output and subwoofer output are available; when bass enhancer is on, only L/R
channel output is available.

2. Hi-fi: Under overall CPU control, only L/R channel output is available to M62446;

3. Cyber logic:
Pin 9/10 of electronic switch N101 (CD4052) select a series of analog L/R channel input
signals. N101 (CD4052) signals. L/R signals are outputted from pin 13/3 via the internal
electronic switch of N101, and divided into two ways. O ne way is respectively sent into pin
13/15 of M62446, for electronic volume and tone control. The other way produces
SW/S-SR/S-SL/S-C signals via buffer, adder-subtractor and low-pass filter. SW/S-SR/S-SL
signals are sent to pin 12/2/5 of N102. N102 select synthesis and decoding signal input (see
truth table of CD4053) from synthesis and decoding and 5.1CH signals, outputs C/SR/SL
signals and sends into pin 11/8/9 of M62446 for volume control. Still another way of SW

Press “input”

Two

5.1

Hi-fi

Standard

Cyber

L/R

L/R/SW
Concert hall sound fil

6-

signal directly sends to pin 6 of M62446 after being outputted from N107A. 5.1CH signal
sent into M62446 is outputted from pin 31-36 after volume and tone control, and then
outputted to signal board by XS20 power distributor.

The relation between sound sources in input circuit and sound processing modes is as

illustrated below.

II. Control circuit

Pin 23/26/27 of CPU (N100) output data, PVST and clock signal and send to pin
39/40/41 of M62446, controlling pin 1/2/3/4 of M62446 to output control level, so as to
select input signal and spectrum sampling signal. It is worth noting that PVST signal is a
latch control signal. When the data and clock of CPU is sent to M62446, an identification
signal will be added, indicating that this signal can only be used by M62446 while other IC
of I2C bus can not use current data and clock signal.

III. Frequency spectrum sampling circuit

Only S-C/S-SR/S-SL/SW signals are sampled during frequency spectrum sampling in
AV230（RU）and added to pin 14 via a 150K sampling resistance. Another S-C synthesis
and decoding signal is added to pin 1 of N103, called S-C＇. 5.1CH and LR-T of
M62446select sampling signals. When synthesis and decoding is selected, the control
signal of 5.1CH is of low level while pin 9/11 of N103 is of low level. According to the
truth table, it is known that the outputs are X0/Z0. Sampling signal is grounded while LR-T
is of H level. Select Y1, S-C＇signal is outputted from pin 15 of N103 to N108B, adding to
OK-R signal for the amplification of frequency spectrum signal, and then sent to frequency
point gating and auto search circuits.

Section Three Signal Processing Board

The signal processing board superposes, mix and amplify 5.1-channel signal sent from the
volume board, voice signal sent from the voice board and karaoke signal.

I AV230（RU）Karaoke Circuit

1. Function: this circuit process human voice through power amplifier and reproduce it
via speaker. It includes human voice beautification circuit, wide sound field processing
circuit, karaoke echo and delay regulating circuit. In addit ion, AV230 (RU) has a special
circuit that enables 5 profiles without inserting microphone.

2. IC and its role for karaoke

IC serial

number
N201 4558 Transmittal. Preamplification for karaoke signal
N200 PT2315 Volume control of karaoke, including tone control
N205 CD4053 Electronic switch
N209 PT2399 Karaoke echo processing
N207 CD4051 Karaoke delay adjustment
N208 CD4051 Karaoke echo control
N204 4558 Phase inverter

PT2315 function pin

S/N Name of pin Description Remarks
1 REF Reference voltage (1/2VDD)
2 VDD Power supply
3 AGND Analog
4 TREB L
5 TREB R
6 RIN R channel input
7 LOUD-R R channel loudness control pin
9 LOUD-L L channel loudness control pin
11 LIN L channel input
12 BIN L
13 BOUT L
14 BIN R
15 BOUT R
16 RFOUT R channel output
17 LFOUT L channel output
18 DGND Digital

Name of IC Role of IC

L/R channel treble control pins

L channel bass control input/output

R channel bass control input/output

pin

pin

19 DATA （DATA）control data of sequence

MIC

N201

N200

N202B

N203B

N209

N204

N207

N208

N100

mixed

N202A

V200

CPU

transmission (DATA)

20 LCK Clock input of sequence

transmission

8，10 NC Not connected

3. Flow chart of karaoke signal

N205

Karaoke

When the microphone is inserted, MIC signal is sent via MIC to the transmittal circuit
combined by N201A and N201B for amplification. Amplified MIC signal gives CPU a
MIC identification signal after N202A amplification, followed by VD201 rectification and
filtering control triode V200. CPU sends PKM signal, which is of low level, causing cutoff
of triode V103/V105 and enabling output of MIC signal; another way reaches pin 6/11 of
PT2315 after C219/C222 coupling, outputs from pin 16/17 after internal volume and tone
control, mixed into one way and sent to N202B and then reversely send to N203B for
amplification. Signals amplified by N203B are divided into two ways. O ne way is directly
outputted. The other way is outputted from pin 14 after being coupled by R222/C247 to
PT2399 for internal delayed reverberation adjustment, reversed by N204 and outputted by
mixing with karaoke signal. While OK-R is outputted from pin 14 after being gated by
N205 and superposed to L/R channel.

In this circuit, the bass boost network made up of triode V201 connected to the
negative terminal of N202B is primarily for bass boost of 75HZ low frequency signal.

During delay adjustment for PT2399, first control signal is given to CPU, which sends

this control signal to N100 by data communication with voice processing IC
(N100HT86P00, HT86384) , and then N100 will control N207 to connect to pin 6 of
PT2399 by selecting different resistance values for purpose of delay adjustment.

Echo control is to change the resistance value at the connection point to R229, so as to
change the superposition on through connect signal for echo control.

The wide sound field processing control signal of SOK’s karaoke is in wide sound
field mode when it is of high level, when the signal of OK-R is the OK signal inverted by

pass

N204A.

N205

N203B

N209

N207

N208

N204

B

N204

A sense signal of OK-SW on the MIC plug conducts MIC signal detection together
with the network made up of V200. When MIC is not plugged, it is of low signal; when
plugged, it is of high signal.
Karaoke auto mute is also available. When P-KT fails to detect signal for a continuous
time, CPU will send a P-KM signal to mute karaoke and avoid MIC from receiving noise,
which may affect sound effect.

l Signal flow chart of profiles

AV230 (RU) has a special function that switching between 5 profiles is available
without karaoke. Its flow chart is as follows:

Mixed output

HT86P00

When pin 9/10 are of high level, sampled L/R/C signals are outputted via from pin 3
N205 gating, and sent to the internal of PT2399 after amplification by N203B for
reverberation delay adjustment (by HT86P00 and HT86384 for voice processing), and then
superposed to L/R/C channel to form different profiles.

In this circuit, MIC shall not be inserted and is only available in 5.1CH mode. N203A

is for the purpose of reversal.

II. Bass enhancer circuit

P-BURST is the switch signal of bass enhancer. When it is of high level and added to
the base electrode of V102, V102 will be switched into conduction. When the collector
electrode outputs low level, V107 will be cut off; when the collector electrode is of low
level, V107 will also be cut off. SW signal is normally outputted to external terminal.
Meanwhile, the high level signal of P-BURST is added to the emitter electrode of V108.
V108 is positively biased and switched into conduction. The collector electrode adds high
level to the base electrode of V101. V101 is positively biased and switched into conduction,
and ground SW signal, not superposing it to L/R channel signal.

In reverse, when P-BURST is of high level, V100 will be switched into conduction
and SWM signal cannot be outputted from external terminal. Meanwhile, V101 is cut off
and SW signal is superposed to L/R channel signal.

The bass enhancer of AV230 (RU) can be divided into three steps. This principle is to

A B X0 X1 X2 X3

0 0 0 1 1 1 1

Truth

0 0 X4 X5 X6 X7

0 1 1 0 1

C

0 0 0 1

1

change the volume of bass enhancer by changing the SW output volume of M62446.

Meanwhile, SWM signal is added to relay via XS9. When the relay is off, SW signal
will be grounded, disabling the output at super bass port.

III. Mixing and amplification circuit of 5.1 signal and karaoke

After L/R channel signal of 5.1 signal is superposed with SW signal and amplified by
N101B/N100B, it is sent to the reverse phases of N101A/N100A. Meanwhile, OK-R/OK-L
signals are also respectively added to the reverse phases of N101A/N100A. After mixing
and amplification by N101A/N100A, they are outputted respectively from pin 1 of
N100A/N101A to power amplification circuit for power amplification.
Meanwhile, the C-1 signal sent by volume board is added to the reverse phase of pin 6
of N102B and added to the reverse phase of N102A after amplification. Now C1-1 signal
after electronic reverberation processing is also added to the reverse phase of N102A and
sent to power amplification circuit after mixing and amplification.

SR-1/SL-1 of another volume board is also added to the reverse phases of N103B and
N104B for amplification and then sent to N103A and N104A for further amplification, and
later sent to power amplification circuit.

One way of 5.1 signal being mixed and amplified is sent to power amplification c ircuit
passing through XS9, and the other way forms DIST (distortion error detecting signal)
signal passing through R111-R113/R142/R145/VD100-VD104, which will be added to
CPU for automatic gain, so as to control volume output.

IV. Voice channel test circuit

CD4051

0

0

1

1

N105 is a single pass 8-option electronic switch, 5 ports of which are used. The voice
signal of voice board sent by C127 and R155 to the reverse phase of NN108A for
amplification, and then added to pin 3 of N105. The output terminal is changed by high/low
control level of pin 9/10/11 (see the truth table above), enabling it to respectively add to the
reverse phase of N100A/N101AN/102A/N103A/N104A as required by CPU, for mixing
and amplification with 5.1 signal, so that speakers can produce corresponding sounds when
being tested and thus determining if each speaker is normal.

Section 4 CPU Board

Achieve overall control, automatically search input signal and analyze spectrum

CPU Overall Control

N100, the overall CPU, is the overall control center, inputting all kinds of
control instructions to controlled circuits to achieve all kinds of control
functions. It adopts +5V supply with pin 40 as its supply pin. Pin 18 and pin
19 connect externally with 12M crystal oscillator to provide working clock
frequency for itself. Pin 9 is its reset pin. When starting, +5V charges C106
via R100. The voltage of two ends of capacitance cannot be mutated, thus
B-pole of triode V100 is low level, that is, V100 conduction gives a high-level
reset signal to CPU. When capacitance C106 finishes charge, V100 stops and
then reset finishes. The form of this reset circuit is to reset high level and keep
low level.

When the machine is working, the static information of start log in the
screen and Chinese characters are stored in CPU internal static memory. N101,
a status memory, can record the current working status of machine when
cutting off and show the status when next starting up, avoiding users to
re-adjust. The sound mode set by users is also stored in it and can be activated
when necessary.

Detect Input Signal and Automatically Search Circuits

DISPLAY signal from volume board is sent to N103A to amplify and
limit level, and then sent to inverse end of voltage comparator N103B after

capacitance coupling. It inputs from pin 7 of N103B and then is sent to pin 16
of CPU via VD103, V101, R109 and R107. When N103B inputs a high level,
VD103 is in reverse cut-off status, B-pole of switch tube V101 is high level
and is in conducting status, then gets an about +5V high leve l (signal input) to
CPU after VD101’s stabilization and stop searching. When the output end of
N103B outputs a low level, VD103 is in conducting status, B-pole of
switching tube V101 is low level and is in cut-off status, and then CPU detects
the low level (no signal input). Its working principles are:
①　After starting up, under CPU internal program’s control, a data signal
is outputted via pin 23 to M62446, and then M62446 scans each input port of
N101, N102 and N103 by emitting high and low levels. When the input ports
have no signal input, it automatically becomes standby status. When any of
ports has signal input, track paths of input N101, N102 and N103 has A/C
signal which is amplified and limited level by N108B and N103A of CPU
board, then compares with pin 5 of N103B and gets plus-minus level close to
supply power. The cophase voltage of N103B is about 0.1V. After the direct
current voltage is over 0.1V, the output end of N103B outputs low level is
close to negative-power voltage, VD103 positive-bias conducts, switch tube
V101 (S9014) stops, emitter outputs a low level to pin 16 of CPU which by
controlling IC M62446 makes search level lock on the port through which
signal inputs, to enter normal play.
②　When pressing “search” key of remote controller, it is converted from

optical signal to electric signal by the remote receiving head of panel. Pin 14

N102B

N10

nt of auto

Pin 28 of

N102A

｝

N108

N105

33

of CPU emits a high level to conduct V102 and search according to the same
previous process.

Spectrum Analysis Circuit (See Following Diagram)

There are three parts for spectrum analysis circuit:

DISPLAY

。

4
CD4051
Gain
adjustme

Seven-segment
band-pass filter

C

+

.

CPU

-

+

V105

35HZ

134HZ
300HZ

1KHZ

2.2KHZ

6.3KHZ

16KHZ

CD4051

Frequenc
y-point
gating

Pin 12 of CPU

}

CPU

+5V

V103

.

V104

A/D conversion

1、 Automatic spectrum gain adjustment circuit: to avoid two situations

that spectrum display amplitude is too low when input signal is too weak

or spectrum display is in full screen when input signal is too strong,
AV230 (RU) sets automatic spectrum gain adjustment circuit, using a
single-channel one-from-eight electronic analog switch, its true value
diagram is as following:

CD4051Truth Value List

X0 X1 X2 X3
A
B
C 0

0
0

1
0
0 0 0

0
1

1
1

X4 X5 X6 X7

0
0

1

1
0 1
1

0

1

1

1

1

Its main working principle is to change the value of inverse ground resistance
of transmittal N104 to change the transmittal gain multiple. Let’s see the
detailed work of the whole circuit. We’ve referred that spectrum analysis
signal source (display) is sent to the cophase input end of transmittal N105C
to amplify. Its amplification factor is determined by the value of the resistance
connecting with the electronic switch of its inverse end N104. When the main
volume is large, CPU will automatically increase the value of ground
resistance and decrease the amplification factor; when the main volume is
small, CPU will automatically decrease the value of ground resistance and
increase the amplification factor.

2、 Frequency-point gating circuit: signal amplified by N105C is sent via

C115 coupling to seven band-pass filters composed of transmittals. By
setting its capacity of feedback capacitance , its frequency-band range can

be determined. The frequency value of superscript of the output points is

V

point circle

Note: the voltage

amplitude in diagram

the central frequency-point of the frequency band. The output end of each
band-pass filter is connected with a half-wave rectifier circuit. The
amplified A/C signal is rectified to direct current. The circuit is mainly to
achieve frequency-point sample. It can display the amplitude of all
frequency-points of the whole sound signal via direct-current voltage. If
the low frequency of sound signal is stronger, the current voltage of output
end of 35HZ and 100HZ band -pass filter is higher. When high frequency
is stronger, the current voltage of 10K and 16K band -pass filter is higher.
The output ends of the seven band-pass filter are connected with the seven
input ends of electronic switch N108 (CD4051). These electronic switches
will quickly circularly-switch among frequency points (refer to previous
true value diagram). Pin 3 output end of N108 will output a string voltage
value representing frequency point signal amplitude (see next diagram).

35HZ

100HZ

1KHZ

300HZ

3KHZ

10KHZ

16KHZ

35HZ

T

Interval of switch

Frequency-

3、 A/D conversion and output circuit display (two situations):

V

35HZ

Interval of

V

35HZ

Discharge of

1、 When no signal input, pin 28 of CPU sends a high level to B-pole of

V104. The positive end of N102B is low voltage, the inverse end of N102B
gets partial voltage of R189 and R172, making N102B output a low level, that
is, triode V105 stops and C- pole of V105 will give a high level to pin 12 of
CPU to let CPU not conduct AD conversion (pin 6/7/8 of CPU are inactive
and keep high level).

100HZ

T

Diagram6

Charge

100HZ

T

Charge

2、When the machine has detected the signal (the inverse end of N102B

has a current voltage representing 35HZ signal amplitude), pin 28 of CPU is
converted into low level and +5V voltage charges for C137 via V103. When
reaching the voltage value of inverse end, the comparator converts and N102B
outputs high level. Once CPU receives low-level signal, it stops 35HZ level
gating and converts into next frequency point 100HZ. During conversion, pin
28 of CPU outputs an instant high level to conduct V104, leak the voltage
capacity of C137 and make the cophase end of N102B restart to charge

100HZ from 0-level. When the charge of 100HZ finishes, the charge and
discharge of next frequency point begin, and such process occurs circularly
under the control of CPU. The charge time form 0-level to the occurrence of
output conversion represents the signal amplitude of current frequency
point— the larger the amplitude, the longer the time and the amplitude
displaying in screen is higher; the smaller the amplitude, the shorter the time
and the amplitude displaying in screen is lower. Digital pulse outputted from
N102B output end is added by V105’s inverse to pin 12 of CPU which handle
it and output to panel to display dynamic frequency in screen. The display of
original frequency poin ts is sequential. However, the above circular process is
extremely quick, thus, what we see in screen is the progress of the whole
spectrum displaying synchronously.

Chapter 5 Control Panel

VFD display

LED backlight

Button

The panel control circuit is the window for man-machine interaction. It
can communicate the operation command with CPU to finish kinds of
artificial operations. At the same time, it is the window of the complete
machine by which human can predominate the complete machine’s working
status. It is also the important element to its appearance. The AV230（RU）
panel control circuit block diagram are showed as follows:

Drive circuit

Power supply

Step up circuit

display

CPU

Remote-control receive

Power supply circuit

1. The AV230（RU）control panel have +5V，-30V，～2.8V power
supply。The circuit consists of VD109，VD110，VD102，VD103，
V107 and V108。
Operating principal：

After the AC current from the transformer was rectified and

filtered by VD109 and VD110，the series regulated power supply

made up of V107 and V108 supply +5V for the next. With the VD102
for rectification and VD103 for stabilized voltage at the same time,
the –30V for display driving was supplied to 16311. In addition,
another ~2.8v was delivery to display filament to make VFD filament
brighten.

Circuit for VFD display drive and push button

The circuit consists of N101, N102, touchscreen and VFD. The tact
switch of touchscreen was made of glass which the backlight can
transmit through to play the role of ornament.
Operating principal：
When displaying, the 16311 receive the signal for displaying from CPU
through VFD communication port, and make the corresponding VFD
field point lighten by internal processing. If there is any push button be
operated, corresponding signal would be output to CPU through the
inner push button matrix code of 16311.

Step up circuit and backlight circuit

This circuit consists of N104MP8004 step up IC, step-up coil, V104,
V105 control triode and backlight.
Operating principal：By control the first pin and the third pin of IC8004,
system controls the PWM signal of inner IC, then control V104 and
V105 to make the step -up coil store energy and step up, and supply the
backlight for lighten ulterioriy.

Section 6: Speech Board

processing

AV230 (RU) amplifier circuit, comparing with previous amplifiers, has
a greatest feature of adding a speech navigation system, making the whole
machine more intelligent and humanistic.

一、 Block Diagram

、

P-LDA

P-LHOLD

Speech

LPF

Amp
lify

When CPU receives the instruction, it immediately communicates with
speech processing chip N100 (HT86384) to send the instruction to N100. The
speech chip connects with EPROM. The speech is stored in the EPROM and
after internal processing, couples via C127 from pin 30 output analog audio
signal to low-pass filter circuit composed of N108A, then after filtering noise,
couples by C126 to pin 2 of N106 (HT82V733) for power amplification and
the amplified signal outputs from pin 1 and pin 7 ends to push the loudspeaker
to emit speech signal.

CPU takes communications by P-LBCK , P-LDA and P-LHOLD.

二、 Working Conditions of HT86384

Pin 33 and 34 are clock pins, adopting 8MHZ working clock. Pin 27 and

egative

28 are supply pins. Pin 22/23/24 respectively takes communications with
P-LBCK , P-LDA, P-LHOLD and CPU. Pin 31 is reset-input pin, keeping high
level for the resetting of low level (V100 with R103, R105 and R106 together
forms reset circuit).

HT86384 is bonding IC. If the IC is damaged, please change the whole
bonding board.

三、 Functions of HT82V733 Pin

Pin 1 2 3 4 5 6 7 8

Function

Note: pin 5 is enable control end. It is normally working when high level and
forbidden to run when low level. By using it, the function of speech switch
may be achieved.

It is used for providing all kinds of needed working voltage for units of
the whole machine. AV230 (RU) adopts a ring transformer with 335W power.

Output

N

Input External

filter

capacitor

Section 6 Power Board

Ground Enable

control

end

Null

pin

Output

positive

Power

supply

The middle and surround track of AV230 (RU) respectively adopt LM1875
and LM1876. LM1876, the dual-track power amplification IC, supplies power
by separate positive power, ensuring there is high separating degree between

two surrounds. It adds +VSS supply comparing with previous machines. The

Rectifier

of L and

amplifier

stage of

Rectifier

diagram of power supply circuit is as following:

一、　Two A/C 38V of transformer first level output is rectified and

filtered by four IN5404 and two big electrolytic capacitors
(15000uF/68V) and gets plus-minus 53V power to supply for right
and left sound tracks.

二、　Two A/C 21V voltage of transformer second level output is

rectified and filtered by four IN5404 and two electrolytic
capacitors (4700uF/35V) and gets plus-minus 28V power to
supply for SL/SR/C sound tracks. Other IC and operational
amplifiers are stabilized by stabilizing tube L7812 and L7912 and
gets power to supply for other IC.

～26V

Panel
display

Filame

nt

Power
amplifier

～220V50HZ

～38.5V

～2.2V

filter

Power

～16.3V

filter

C,SL

Power-amplification Board and Protective Circuit

Voltage

cation

current

Compound power

复合功率放大

A/C negative

一、Power amplification circuit of L and R sound trac ks: L and R main power
amplification circuits of AV230 (RU) are composed of separate elements. The
block diagram is as following (taking L sound track for example)

L

feedback

V132，V112

V101
V115
Mute

Differential
amplificatio

Image constant­source

amplifi

.

Temperature
compensatio

Re
lay

amplification

L-track signal is sent by coupling of R101, R103 and C101 to B-pole of
differential amplification stage V102. V102 and V103 compose of differential
amplification circuit of single-end input and output. Speech signal is outputted
from C-pole of V102 to B-pole of voltage amplification stage V105, and then

Sp
ea

to compound power amplification stage after amplifying voltage. V104, V107,
VD102 and VD103 compose of image constant-current source circuit. VD102
and VD103 provide constant base current for V104 and V107. The emitter
resistance of V104 decides the working current of differential amplification
stage and the emitter resistance of V107 decides the working current of
voltage amplification stage. V132 and V112 compose of compound tube
amplification, making the final stage of power amplification with strong

current amplification, which compose of wave plus half-circle amplification.
V133 and V113 compose of wave minus half-circle amplification, whose
circuit structure is completely same to the previous tube. Two functions of
temperature compensation tube V106 are: firstly, it is the base-level bias of
upper and lower tubes. Its working status determines the static working
current of compound power amplification. That is, we can set the static
working point of compound power amplification stage by adjusting V106
conduction. The common way is to change the base resistance of V107. It can
also automatically adjust the working status of compound power amplification
stage when the temperature arises. The adjusting process is:
Total current of output stage = working current + leakage current
When temperature arises, leakage current also arises, causing the static
working point flow (bad). At the same time, the leakage current of V106
arises and Uce decreases, causing the bias current of output stage decreases,
working status changes and working current of back pole decreases, in order
to compensate temperature.
Voltage negative feedback is introduced in power amplification circuit of
AV230 (RU), composing of R121, R109 and C105, stabilizing the static
working point of differential stage. AV230 (RU) adopts direct output. R111
and C116 of its output end compose of Rubeier network, preventing
high-frequency self-excitation caused by A/C inductive reactance of
loudspeaker speech coil.

二、　The principle of R-track is same to that of L-track. No more words

here.

三、　Mute circuit: when pressing mute key of remote controller, a

photoelectric conversion mute signal by remote receiving head is sent
to CPU, whose pin 35 and 36 emit a high-level mute instruction to
conduct V115, V101 and V116 and L and R-track signal short pass
ground, achieving the mute control.

四、C, SR and SL power amplification circuit: comparing with previous
machines, these three tracks of AV230 (RU) adopts special power
amplification LM1876 and IC LM1875. LM1876 has 15 pins. The pin 2, 15
and 4 are respectively its plus-minus power pin. The pin 7/8/12/13 is its
cophase and inverse input end. The rated output power of each track of the
power IC can reach 20W with automatic mute function when starting up. 1875,
five pins, is a power amplification IC with better performance and extremely
simple application circuit which has 15W power output in rated status. Its pin
5 and 3 is plus -minus power supply pin.

五、Protective circuit

The protective way of L, R and C tracks is to cut off relay Y100 when
starting up to cut off its output. SR and SL tracks protect by mute. AV230
(RU) has functions of starting delay protection, mid-point over-voltage
and over-current protection and standby protection.

4、 Starting delay response protective circuit: because the circuit is unstable

when starting up and its dash current does great harm to sound box and

Each track is

with an

L CH is

conducts

voltage

Cut off relay

to protect

power amplification circuit, the delay response protective circuit is set.
There are two steps for starting delay response protective circuit: firstly, C,
L and R. Its working process is: the A/C of transformer is rectified and
filtered by VD113 and C110 to form a 22V voltage, then R108 charges
C115 to inversely breakdown VD111 and V105 and V104 forward
conduct, finally the Y100 responses and delay forms. Secondly, L and R
surround tracks take starting anti-dash protection by following ways:
when the system resets, pin 33 of CPU outputs a high level, passing R164
to pin 9 and 14 of LM1876 which outputs mute. After machine successes
in delay starting, pin 33 of CPU switches into low level and SL/SR path
normally outputs.

5、 Mid-point over-voltage protection: the output end of each track is

connected with a over-voltage sampling resistance. L-track is R116,
R-track is R117, C is R118 and SR and SL are respectively R119 and
R120. As long as any mid -point voltage of tracks is over +3.5V or lower
than -3.5V, V101 or V102 conducts to decrease their C-pole voltage, then
V103 conducts to finally cut off relay to protect circuit starting.

connected

over+3.5V

R

Less than +3.5V

V101

V102

C-pole

V103
condu

ack is

with an

L track

voltage

Cut off relay

to protect

The voltage

drop of R126

and R127

6、 Over-current and short-circuit protection: output load resistances of L and

R-track are connected with an over-current sampling triode. The sampling
tube of L-track is V114 and load resistance is R126 and R127. The power
amplification IC of other three tracks has functions of over-current
protection. As long as over-current occurs in L-track, the voltage drop of
R126 and R127 will rapidly increase. Once the voltage drop of R129 is
over 0.7V, V114 will conducts, and then V103 conducts and finally relay
cuts off to protect circuit starting.

Each tr
connected

is V114

V114
cond

C-pole

V103
condu

In same manner, voltage of R159 will be over 0.7V to conduct V129, then
conduct V103 and finally cut off relay to protect loudspeaker.
7、 Energy -saving protection: when standby time reaches 10 minutes and still

needs continuing, CPU pin 34 output PRC signal is high level which
saturates and conducts V100 via VD108 and R101, then conducts V103
and finally cuts off relay to save standby energy.

Maintenance and repair flow

Malfunction Phenomenon： Sound fault

Analysis：Generally, such fault can be checked by signal injection step by

step. If the speaker of any step has no disturbance, there must be problems
with this step. In general, this method should be carried out from rear step to
front step. Another method is signal detection, which is carried out from front
step to rear step. If there be no sound with any step, this step must be the fault
point. Specific examine and repair flow for this fault is showed as follows:

No

No

No microphone

C222 to confirm

if there be sound or not

Check circuit for N210 and

microphone

Check R219 and R220 to

confirm if there be sound or not

Check PKCK, PKDA signal of

PT2315 and CPU

Check R230 to confirm if

there be sound or not

Check N202 and its power

supply circuit

Check C245 and C246 to

confirm there be sound or not

Check N203 and its power

supply circuit

Base electrode of V104 and

V105 is 0.7AV or not?

have

electrode of V103 is

MICDET be high level?

V103 fault

No No No No No

Yes

Yes

Check C219，

The E­high level or not?

Check if V104 or V105
been broken-down or not

PKT be low level?

CPU fault
Microphone fault

二、Fault phenomenon: No display

N

V105 itself and its power sup

ply is

Check power supply, V105 and

N VD118 is normal or not?

N

VD118

If there be any change between high level

Check CPU and

ith

V103 and V104

No display

N102B forward terminal

N

OK

N102B reversal has high level

Check N102 and

N N108 and CPU control pin work

Check control signal, N108

N

segment

Y

and low level on collect electrode of V105

normal or not?

OK

OK

voltage jump or not?

and low level or not?

OK

I2C bus

peripheral circuit

Replace

Check the circuits w

peripheral circuit

properly or not?

Check the auto-gain regulate circuit made of seven­band-pass filter, C115 and N105

and peripheral circuit

OK

Automatic search

DISPLAY signal be delivered to

N Check spectrum sampling and

Voltage be supplied to N103B

N Check N103A amplifying

Cophased terminals of N103B

Check N102 and

N

VD103 be normal or not?

N

Y Check VD101, CPU, V101 and

三、Fault phenomenon：Automatic search fault

fault

103A reversal or not?

reversal or not?

be low level or not?

Y

Y

Y

amplifying circuit, N103 and N108B

circuit and power supply circuit

peripheral circuit

Replace VD103

peripheral circuit

should be

Check if resistance R111 and R141

Check if resistance R108 be

Check if RLY inspecting signal work

Check which sound channel output DC

Check if overcurrent protect diode or triode

R201 be open

Vibration protection or not?

四、　Starting up protection

Check if there be Mid-Point Voltage or not?

Y

N

Check if signal or main volume
augmented for protection

Y
N

be open circuit

N Y

open circuit

and check this sound channel

be damaged, or capacitor C115 is poor

Replace resistance

N Y

properly

Check if resistance

N Y
Y

circuit on CPU board

Replace resistance

Replace relay

F

E

D

C

B

A

31-Mar-2004

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AUX

数 量

VCD

标 准 化

DVD

R

L

SR

SL

AV230

音量板电原理图

第 张 共 张 版次

2

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SW

C

BBK

12

0.0

XC101A

R

L

XC101B

R

L

XC101C

R

L

XC102A

R

L

XC102B

R

L

XC102C

R

L

R'

L'
SL'
SR'

C'
SW'

XS19

CON8

R174
47K

SR1
SL1
C-1
R-1
L-1

47u/16V

+12V

-12V

C104

SR1

SL1

C-1

R-1

L-1

XS20

CON10

P_VCK

P_VDA

P_VSTA

1
2
3
4
5
6
7
8
9
10

+12V

CON5

R131

220/0.5W

VD101

6.8V

XS22

1
2
3
4

123456

5
6
7
8
9
10

XS21

N101

R130 1K

3

R132 47K

2

R152 47K

1

R197 1K

R111 1K

6

R112 47K

5

R113 47K

4

R114 1K

R115 1K

9

R116 47K

8

R117 47K

7

R118 1K

R119 1K

3

R120 47K

2

R121 47K

1

R122 1K

R103 1K

6

R104 47K

5

R105 47K

4

R106 1K

R107 1K

9

R108 47K

8

R109 47K

7

R110 1K

R2521KR253

1
2
3
4
5
6
7
8

R254

R255

1K

6

5

C105

221

2

3

C106

221

R2561KR257

1K

1K

-12V

47u/16V

8 4

N104B

N104A

4558

C107

47u/16V

4558

C108

1K

7

1

R1241KR125

R137 56K

R138 56K

R139 100K

C109 101

R140 47K

R141 22K

R142 33K

5.1CH

SW

LR-T

R126

1K

1K

+12V

AUX-R

VCD-R

DVD-R

5.1CH-R

AUX-L

VCD-L

DVD-L

5.1CH-L

B

S-C

5.1CH-C

S-SR

5.1CH-SR

S-SL

5.1CH-SL

CD4052

12

X0

14

X1

15

X2

11

X3

1

Y0

5

Y1

2

Y2

4

Y3

6

INH

9

B

B

10

A

A

N102

CD4053

12

X0

13

X1

2

Y0

1

Y1

5

Z0

3

Z1

6

INH

11

A

10

B
C9VEE

5.1CH

N103

CD4053

12

X0

13

X1

2

Y0

1

Y1

5

Z0

3

Z1

6

INH

11

A

10

B
C9VEE

R195
56K

-12V

N105A

2

4558

3

8 4

+12V

C110 101

R143

27K

N105B

6

4558

5

13

X

3

Y

16

A+6.8V

VDD

8

VSS

7

A-6.8V

VEE

14

X

15

Y

4

Z

16

VDD

A+6.8V

8

Vss

7

A-6.8V

R134

R135

R136

150K

150K

150K

14

X

15

Y

4

Z

16

VDD

A+6.8V

8

Vss

7

A-6.8V

S-C

C111

1

4.7u/16V

7

S-SR S-SL

R133
150K

R149 22K

R148 30K

R144 47K

R145 22K

R146 33K

C115

47u/16V

A+6.8V

2

3

C112 101

R147

27K

6

5

R150 22K

8 4

C113

N107B

221

-12V

N107A

4558

+12V

4558

C116

47n

5.1CH

LR-T

SWOUT

RBASS3

RBASS2

RBASS1

7

DVDD

DATA

LATCH

DGND

AGND

SROUT

SLOUT

COUT

ROUT

LOUT
AVSS

RTRE

CLK

CL1

CL2
CR1

CR2

C150
103

C143

47n

C130

4.7u/16V

C129

4.7u/16V

R153

22K

B

B

A

A

LR-T

5.1CH

R157

100K

R160

100K

R161

100K

R162

100K

R158

100K

R159

100K

22K

22K

22K

1

OUT4

2

OUT3

3

OUT2

4

OUT1

5

AVDD

6

C117

SWIN

4.7u/16V

7

8

C118

4.7u/16V

9

C119

4.7u/16V

10

11

C120

4.7u/16V

12

13

C121

4.7u/16V

14

15

C122

4.7u/16V

16

17

C123

18

822

19

C124

15n

20

C125

0.33u

21

R191

100K

GNDS

SRIN

SLIN

GNDC

CIN

GNDR

RIN

GNDL

LIN

BYPASR

BYPASL

LTRE
LBASS3

LBASS2

LBASS1

R196 100K

C114 22P

6

5

N106

M62446

N108B

4558

R156

R155

R154

42

41

40

39

38

37

C138 4.7u/16V

36

C137 1u/16V

35

C136 1u/16V

34

C135 4.7u/16V

33

C134 4.7u/16V

32

C133 4.7u/16V

31
30
29

28
27

26
25
24

23

22

C144
103

DISP

C131 47n

C128

822

C127

15n

C126

0.33u

C149
103

C142

47u/16V

L101 100uH

C141

101

A-6.8V

C132

47u/16V

C148
103

C140

101

1

R170 75K

C146

3.9n

-12V

R169 68K

7

R167
100K

R168 27K

C145

10n

N108A

2

3

C147

4558

1

SW1

47u/16V

8 4

+12V

C102 47n

1
2

CON2

D+5V

R163 100

R164 100

R165 100

C139

101

SR1

SL1

C-1

R-1

L-1

R178
47K

47K

47K

47K

SR1
SL1
C-1
R-1
L-1
SW1

DISP

OK-R

R175

R176

R177

-12V

A-6.8V A+6.8V

R129

220/0.5W

VD100

6.8V

C101

47u/16V

C103 47n

F

E

D

C

B

A

F

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信号板原理图一

BBK

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1

1.0

SW-OUT

XC100

P_BURST

XP20

1
2
3
4
5
6
7
8
9

10

CON10

DISP

OK-L

OK-R

P_KM

C1-1

P_SCART

X100

SCART-03

XS103

16PIN

A

XS9

1
2

L1

3

R1

4

C1

5

SL1

6

SR1

7

From AMP Board

CON7

XS13

1

P_RLY

2

P_RC

3

P_LRM

4

P_SCM

5

CON5

VD100
1N4148

VD101
1N4148

VD102

DIST

1N4148

VD103
1N4148

VD104
1N4148

R105
47K

P_VCK

P_VDA

P_VST

A+5V

+12V

-12V

+12V +12V

C124

47u/16V

C125

47u/16V

C137

C136

103

103

V110

2N5551

VD106 1N4004

VD107 1N4004

C135

V109
S8050

C130

SWM

103

123456

DIST

XP22

1
2
3
4
5
6
7
8
9
10

CON10

C121
47n

C122
47n

-12V-12V

C138

103

XS24

1
2
3

CON3

FAN

FAN

R167

47K

XS23

1
2
3

CON3

-12V

N100A

4558

+12V

-12V

N101A

4558

+12V

-12V

N102A

4558

+12V

-12V

N103A

4558

+12V

-12V

N104A

4558

+12V

2

GND

B

1

C131 10u/16V

1

C132 10u/16V

1

C139 10u/16V

1

1

Vin

R1

P_RLY

P_RC
P_LRM
P_SCM

R111 560

R112 560

R113

L1

R142 39K

R145 39K

560

R104
47K

C1

P_VCK
P_VDA
P_VST

R158

SR1

100

R161

SL1

100

VD108

1N4148

R168

10/0.5W

1

C128

47n

2200u/16V

C

C103 47P

R132 27K

N100B

4558

6

5

6

5

6

5

6

5

6

5

C105 47P

R133 27K

C107 47P

R134 30K

C109 47P

R135 27K

C110 47P

R136 27K

N101B

4558

N102B

4558

N103B

4558

N104B

4558

7

7

7

7

7

C113

4.7u/16V

C114

4.7u/16V

C118

4.7u/16V

R121 20K

R137 18K

R138 15K

R123 20K

R140 18K

R141 15K

R124 47K

R108 22K

R144 15K

R125 47K

R146 15K

R126 47K

R150 15K

8

7

6

C143

C144

47n

47n

C142

100u/16V

C129

5

C104 47P

R101 47K

2

3

8 4

C106 47P

R102 47K

2

3

8 4

C108 47P

R103 47K

2

3

8 4

C111 101

R106 47K

2

3

8 4

C112 101

R107 47K

2

3

8 4

N107
7805

3

Vout

C134

47n

220u/16V

N105 CD4051

XCOM

VDD

VSS
INH

VEE

A(0)
B(1)
C(2)

RH-357508

C145

103

VD110

1N4148

VD105

1N4148

C126

L101

C100

10u/16V

0.1u

D

R120 22K

R115

100K

C101

R116
100K

VD111

1N4148

VD109

1N4148

X0

X1

X2

X3

X4

X5

X6

X7

10u/16V

13

14

15

12

1

5

2

4

D+5V

C133 0.47u/50V

1

2

3

R127 39K

R128 22K

R122 39K

R129 20K

R130 20K

R131 20K

N106 HT82V733

OutN

VDD

AUDin

Vref

VSS4CE

OutP

NC

E

1

SWM

R100

2

47K

D+5V

R117

4.7K

R169 3K

P_BURST

C115

22u/16V

SR-1

SL-1

C-1

C-1

R-1

R-1

L-1

L-1

SW1

DISP

OK-L

OK-R

P_KM

C1-1

P_SCART

V106
9014

R157

R154

2.2K

47K

1
2
3
4
5
6
7
8
9
10
11

1
2
3
4
5
6

S_OK

7
8
9
10
11

ECA

12

ECB

13

ECC

14

DLC

15

DLB

16

DLA

C116

103

XS102

12PIN

C102

103

C127 0.1u

AUDout

1
2

DGND

3

VD+5V

4
5
6
7
8

VOICE_C

9

VOICE_B

10

VOICE_M

11

VOICE_A

12

FIELD

C117

103

XP19

1
2
3
4
5
6
7
8

CON8

R155 15K

R166 100
R165 100
R164 100

R149 470
R148 470
R114 470
R147 470

GND

R'
L'
SL'
SR'
C'
SW'

R109

1K

R152 2.2K

R110 1K

R151 2.2K

R156 15K

C140
561

2N5551

P_HOLD

P_LDA

P_BCK

V107

2N5401

V100

V102

R139

S8050

10K

R162

10K

+12V

V108

2N5401

V101

S8050

R163

10K

V104

S8050

V103

C119

22u/16V

2N5401

V105

S8050

R143

10K

R153

4.7K

3

16

+6.8V

8
6

R160
1K

7

-12V

N108A

4558

+12V

P_HOLD

P_LDA
P_BCK

-6.8V

11
10

9

1

VD+5V

R159 15K

C141 561

2

3

8 4

F

E

D

C

B

A

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AV230VOICE BOARD

XP100

16PIN

123456

A18

A17

A14

A13

A11

A10

C107

+5V

103

32

31

A18

30

A17

29

A14

28

A13

27

A8

A9

OE

CE

D7

D6

D5

D4

D3

A8

26

A9

25

A11

24

23

A10

22

CEB

21

D7A0

20

D6

19

D5

18

D4

17

D3

A19

A16

A15

A12

A7

A6

A5

A4

A3

A2

A1

D0

D1

D2

+5V

10

11

12

13

14

15

16

R105

4.7K

1

2

3

4

5

6

7

8

9

N101 27C080

A19

A16

A15

A12

A7

A6

A5

A4

A3

A2

A1

A0

D0

D1

D2

VSS

R103

1K

R106

4.7K

VDD

R101

10

AR1058AR1159AR1260AR1361AR1462AR1563AR1664AR1765AR1866AR1967AR20

+5V

A6A7A8A9A10

57

53

A5

52

A4

51

A3

50

A2

49

A1

48

A0

47

D0

46

D1

45

D2

44

D3

43

D4

42

D5

41

D6

40

D7

39

+5V

38
37

C103

36

30P

R102

100K

R104

C101

10

104

G101
8MHz

+5V

C102

104

C104

30P

V100
9015

OUT1

AR654AR755AR856AR9

TSTB
OSC2
OSC1

INTB

OUT2

AR5
AR4
AR3
AR2
AR1
AR0
DR0
DR1
DR2
DR3
DR4
DR5
DR6
DR7

35

A11

A12

A13

A14

A15

A16

A17

A18

A19

A20

CEB

N100

C100

103

PWM2

PWM1

PA7

PA6

PA5

PA4

PA3

PA2

PA1

PA0

PB7

PB6

PB5

PB4

PB3

PB2

HT86P00

1
2
3
4

5
6
7
8

9
10
11
12
13
14
15
16
17
18

16

PA7

15

PA6

14

PA5

13

PA4

12

PA3

11
10
9
8
7
6
5
4
3
2
1

+5V

PA2

PA1

PA0

PB7

PB6

PB5

PB4

PB3

PB2

PB1

PB0

69

68

CEB

PWM2
PWM1
VCCA2
GND

PA7
PA6
PA5
PA4
PA3
PA2
PA1
PA0
PB7
PB6
PB5
PB4
PB3
PB2

PB119PB020PC721PC622PC523PC424PC325PC226PC127PC028GND29GND30VCC31VCCA132VOUT133VOUT234RESB

PC0

PC1

PC2

PC3

PC4

PC5

PC6

PC7

PB0

PB1

P_LHOLD

P_LDA

P_LBCK

东莞市步步高视听电子有限公司

第 张 共 张 版次

BBK

1

1 1.0

F

OUT2

C108

XP101

12PIN

103

+5V

DGND

P_LHOLD

P_LDA

PC7

OUT1

P_LBCK

PC3

PC4

PC5

PC6

1234567891011

E

D

ADout

12

C105

C

+5V

104

C106

100uF

B

A

31-Mar-2004

卢建强

设 计 审 核 批 准

更 改 更 改 单 号 签 名 日 期

F

E

D

C

B

A

123456

数 量

标 准 化

AV230

功放板电原理图

BBK

第 张 共 张 版次

5

东莞市步步高视听电子有限公司

12

0.0

XP9

CON7
XP13

CON5

123456

C103

47u/100V

R1052KR106

2K

C101

R101

10K

V101

VD101

1N4148

SWM

1

L1

2

R1

3

C1

4

SL1

5

SR1

6

GND

7

GND

1

P_Rly

2

P_RC

3

P_LRM

4

P_CSM

5

C121

22u/16V

S8050

R161

4.7K

V115

2N5401

R162
10K

V116
S8050

R103

1K

R102
100K

R131

10K

R133

1K

R132
100K

10u/16V

C111

10u/16V

V102

2N5551

2N5551

C104

220p

R107 47

V104

2N5551

C107

47u/100V

R1352KR136

V117

2N5551

C114

220p

R137 47

V119

2N5551

C117

47u/100V

R108

C105

100u/16V

R110

510

2K

2N5551

R138

C115

100u/16V

R140

510

R104

47K

C113

47u/100V

R134

47K

V103

47

R109 1K

VD102
1N4148

VD103
1N4148

V118

47

R139 1K

VD105
1N4148

VD106
1N4148

33p/500V

R111

33K/0.5W

33p/500V

R141

33K/0.5W

2N5551

R112

2N5551

R142

C108

V106

R115

2.2K

1K

C118

V121

R145

2.2K

1K

Vs+

R163

10K

R165

4.7K

R166

4.7K

C122

22u/16V

C123

22u/16V

V130
2N5401

R164

33K

Vs+

C127

R167

4.7K

C124

10u/16V

R169

V131

47K

S8050

C125

R168

10K

4.7u/16V

R170

820

53

47n

1

2

R171

33K

C126

68p

4

N104

LM1875

C128

47n

Vs-

R114 4.7K

R144 4.7K

R113

150

V105

2N5401

V107

2N5551

R116

150

R143

150

V120

2N5401

V122
2N5551

R146

150

R117

220/0.5W

R125

220/0.5W

R147

220/0.5W

R155

220/0.5W

V132

2SC5248

R121

C109

33K

47n

V133

2SA1964

R120

100/0.25W

R122

100/0.25W

V112

2SC5200

R126

0.25/7W

R127

0.25/7W

V113
2SA1943

R128

4.3K

R129

1.5K

0.47u/16V

R130

4.3K

Vc-

V134

2SC5248

R150

100/0.25W

R151

C119

33K

47n

V135

2SA1964

R152

100/0.25W

V127

2SC5200

R156

0.25/7W

R157

0.25/7W

V128
2SA1943

Vc+

R158

4.3K

R159

1.5K

0.47u/16V

R160

4.3K

Vc-

C131

4.7u/16V

R172 47K

R176

47K

C132

4.7u/16V

C158

C157

1u/50V

471

471

C130 1u/50VC129

VD104

1N4148

V114

2N5551

C110

N101

R183

Vs+

47/3W

220u/35V

C147

VD107

1N4148

V129

2N5551

C120

C155 47p

N105
LM1876

R174

820

7

8

R173 1K

6

MUTEA

11

MUTEB

9

STAN-A

14

R177

STAN-B

1K

13

12

R178

820

C156 47p

R184

Vs-

47/3W

R182 33K

R175

33K

OUTA

A

VDDA

GNDA

VDDB

GNDB

VEE

OUTB

B

R179

33K

R185 33K

220u/35V

3

C134

104

2

5

15

C135

10

104

4

C136

104

1

L7812

1

C146

Vin

2
1

2

Vin

N102
L7912

C139

47n

Vs+

Vs+

C159

10u/100V

Vs-

C140

47n

GND

GND

Vout

Vout

C141

4700u/35V

C142

4700u/35V

100u/16V

3

3

C149

100u/16V

C148

VD111

1N5404

VD112

1N5404

VD113

1N5404

VD114

1N5404

C150

47n

C151

47n

L2
R2
C2
SL2
SR2

GND

FL101

T6.3A250V

C143

C144

FL102

T6.3A250V

Vc+

XS7

SWM

1

Rly0

2

P_RC

3

Over

4

CON4

XP6

+12V

1

DGND

2

DGND

3

-12V
4

CON4

XS8

1
2
3
4
5
6

Vc+

7
8
9

Vc-

CON9

XS5

0.1u

0.1u

CON3

1
2
3

F

E

D

C

B

A

F

31-Mar-2004

李林存

设 计 审 核 批 准

更 改 更 改 单 号 签 名 日 期

123456

数 量

标 准 化

AV230 CPU

板电原理图

BBK

第 张 共 张 版次

1

东莞市步步高视听电子有限公司

R129

470K
R128

180K

1

1.0

R127

75K
R126

27K
R125

10K
R124

4.3K
R123

2.2K

R122

1.5K

DISPLAY

R162

10K

R163

4.7K

R157

10K

R158

4.7K

R152
10K

R153

4.7K

R148

10K

R149

4.7K

R143
10K

R144

4.7K

R138
10K

R139

4.7K

R133
10K

R134

4.7K

C115
10u/16V

C114

10u/16V

B

+5V

C155

C142

103

104

012345678

40

Vcc

39
38
37
36
35
34
33
32
31
30

R168 10K

ALE

29
28
27
26
25
24
23
22
21

+5V'

012345678

P_KCK

P_KDA

C105

103

RESET

V100
9014

C108
104

R101

4.7K

RR100

8*4.7K

R202 470
R201 470
R200 100

P_CHARGE

R199 470
R195 470
R196 470
R192 470
R191 470
R198 470
R197 470

RR101
8*4.7K

+5V

8

7

6

5

R+5V

R100

R211

4.3K

4.7u/16V

22K

N101

24C02

C106

VDD

TEST

SCL

SDA

P_GNA

P_GNB

P_GNC

P_CSM

P_LRM

P_RC

P_RLY

P_SCART

C156
221

P_VCK

P_VST

P_KM

P_HOLD

P_VDA

P_KCK

P_KDA

R194 100

C107

104

A0

A1

A2

VSS

R193

4.7K

R187

10K

VD117

V103
2N5401

R174

4.7K

VD102

1N4148

C

R184

5.6K

P_DIST

R185

4.7K

P_DST1

P_DST2

P_DDA

P_DCK

P_KT

P_ADSELA

P_ADSELB

P_ADSELC

RESET

P_BURST

P_BCK

P_ADINT0

P_REM

P_SELECT

P_DIST

P_SEARCH

P_LDA

P_LDA

C103

P_KT

3.3V

6

5

V104

C137

0.1u

9014

R209 22

R210 1M

30P

N102B
4558

7

R175

2.2K

L100

D+5V

100uH

R203 470
R204 470
R205 470
R206 470

R207 0
R208 470

G100

12M

R177

1K

C138

0.22u/16V

+12V

R110
22K

V101

9014

R109

15K

R107

VD101

4.7V

100

R108

10K

VD118

1N4148

1
2
3
4
5
6
7
8

9
10
11
12
13
14
15
16
17
18
19

C102

C100

104

47u/16V

N100
W78E58

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
GND20P20(A8)

C104
30P

R179
10K

R178
10K

L101

RH-357508

P00(AD0)
P01(AD1)
P02(AD2)
P03(AD3)
P04(AD4)
P05(AD5)
P06(AD6)
P07(AD7)

EA/Vpp

P27(A15)
P26(A14)
P25(A13)
P24(A12)
P23(A11)
P22(A10)

P21(A9)

+5V

PSEN

P_ADINT0

V105

9014

P_CHARGE

P_SEARCH

E

C135

C134

154

C131
683

C128

223

C125

103

C122

472

C119
152

C116
561

154

R164

13

100K

12

10

103

C143

C146

103

13

12

N106D
LM324

C132

683

R159

9

100K

N106C
LM324

C129

223

R154

100K

-12V

2

3

N106A

LM324

C144

4 11

103

C126

103

R150
100K

6

5

N106B
LM324

C123

472

R145
100K

6

5

N105B
LM324

C120

152

-12V

R140

100K

C145

103

2

3

N105A
LM324

4 11

C117

561

R135

100K

N105D

LM324

+12V

+12V

R165

VD114

1K

1N4148

14

R166

VD113
1N4148

8

R161
10K

VD112
1N4148

1

R156

VD111
1N4148

7

R186
10K

VD110
1N4148

7

R147
10K

VD109
1N4148

1

R142
10K

VD108
1N4148

14

R137
10K

35Hz

C136

2.2u/50V

10K

R160
1K

134Hz

C133

2.2u/50V

R155
1K

300Hz

C130

10K

2.21u/50V

R151
1K

1KHz

C127

2.2u/50V

R146
1K

2.2KHz

C124

2.2u/50V

R141
1K

6.3KHz

C121

2.2u/50V

N108

13

R136
1K

16KHz

C118

2.2u/50V

14

15

12

1

5

2

N105C

R132

22K

R131

10K

13

X0

14

X1

15

X2

12

X3

1

X4

5

X5

2

X6

4

X7

N104

CD4051

VCC

GND

VEE

3

X

16

8
6

INH

7

11

A

10

B

9

C

LM324

10

9

R120

0

C113
10P

C111
10u/16V

C112

10u/16V

8

R130

470K

R118

+6.8V

470/0.25W

+12V

VD106

6.8V

VD107

6.8V

-12V

R119

-6.8V

470/0.25W

P_GNA

P_GNB

P_GNC

4

CD4051

C149

84

103

3

R117

2

10K

C150

103

R116

D

C151 103

+12V

R181

+12V

C140
100u/16V

C141
100u/16V

100

R180
22K

R182

220

R183

22K

DIST

C139

22u/25V

+12V

-12V

+12V

N103A

4558

VCC

GND

VEE

3

X

16

+6.8V

8
6

INH

7

-6.8V

11

P_ADSELA

A

10

P_ADSELB

B

9

P_ADSELC

C

C110

4.7u/16V

1

6

X0

X1

X2

X3

X4

X5

X6

X7

5

47K

-12V

R115

470k

R114

1.5K

84

XP100

CON15

N107A
4558

10
11
12
13
14
15

VD119

1

1N4148

-12V

1

GND

2

+12V

3

D+5V

4

GND

5

R+5V

6

P_DST1

7

P_DST2

8

P_DDA

9

P_DCK

P_KT

P_GNC

P_BURST

P_REM

3

2

-12V

C152 103

+5V

+5V

103

C147

+12V

84

4558

N102A

3

R167

2

100K

C148

-12V

103

+5V

N103B

4558

7

VD103

1N4148

VD115

1N4148

+12V

R169
470K

1

R170

1K

R172
10K

R173

5.6K

VD116

1N4148

C109

2.2u/50V

+12V

R111

R113

4.7K

180K

V102

9014

R112

2.2K

R189
10K

P_SELECT

-12V

A

123456

DISP

DIST

P_CSM

P_LRM

P_RC

P_RLY

P_SCART

P_VCK

P_VST

P_KM

P_KCK

P_KDA

P_LDAP_BCK

P_HOLD

P_VDA

C154
221

R104

1

0

2

3

4

XP101

CON15

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15

F

E

D

C

B

A

F

31-Mar-2004

卢建强

设 计 审 核 批 准

更 改 更改单号 签 名 日 期

123456

数 量

XS1

2
1

标 准 化

POWER BOARD

东莞市步步高视听电子有限公司

第 张 共 张 版次

BBK

1

1 1.0

CON2

~220V 50HZ

XP7

OVER
P_RC
RLY0
SWM

From AMPFrom AMP

CON4

XP8

1

L2

2

R2

3

C2

4

SL2

5

SR2

6

VC+

7

GND

8

GND

9

VC-

CON9

4
3
2
1

VC+

VC-

E

FL100

T6.3AL250V

RLY0

SWM

C102

CT7 103

VD108

IN4148

R101

1K

R111

4.7/1W

R112

4.7/1W

R113

4.7/1W

R114

4.7/1W

R115

4.71W

R102

1K

R103
47K

XS2

1
2

CON2
XS3

1
2

CON2

C116 0.1u

C117 0.1u

C118 0.1u

C119 0.1u

C120 0.1u

TO SWITCH

TO TRANS

VD113

1N4004

V100
C9014

C126

103

R104

10K

R100

47/3W

L100

0.7UH

L101

0.7UH

1

2

XL101A

R106

WP6

4.7K

R109

C

C100

FL101

T8AL250V

C103

0.22u

C104

0.22u
FL102

T8AL250V

VD110

IN4148

R108

100K

R107

100K

V103
C9015

C121

10k

103

1

2

XL101A

WP6

C101 22n

C105 22n

C111 22n

C115
47U/25V

9

10

11

12

13 14

22n

VD111

5.1V

Y100

RELAY-4

VD100

1N5404

VD101

1N5404

VD102

1N5404

VD103

1N5404

VD104

1N5404

VD105
1N5404

VD106

1N5404

VD107

1N5404

VD112

1N4148

B

C108
8200u/63V

C109
8200u/63V

R110
56K

SWM

RLY0

XL101A

1

2

WP6

V104
C8050

1

5
2

6
3

7
4

8

C123

103

C112

103

XL100A

1

2

WP4

C106

0.1u

C107

0.1u

XL100A

1

2

WP4

A

123456

Vc+

Vc-

V105

C9014

D

From TRANS

XS4

1

~V1

2

0

3

~V1

4

V-RLY

CON4

C110

220u/35V

C122

104

R105
10K

R116

51K

R117

51K

R118

47K

R119

47K

R120

47K

C113

220u/16V

C114

220u/16V

V101
C9014

V102
C9014

F

E

D

C

B

A

30-Mar-2004

张广胜

设 计 审 核 批 准

更 改 更 改 单 号 签 名 日 期

F

E

D

C

B

A

123456

数 量

标 准 化

AV230 FRONT PANEL BOARD

BBK

第 张 共 张 版次

1

东莞市步步高视听电子有限公司

1

1.0

XS11

1
2
3
4
5
6
7

From TRANS

CON7

1N4004

2200u/16V

VD109

C119

R137

10/0.5W

R138

100/0.5w

VD110

1N4004

D+5V

FL1

FL1

FL1

VFD101

VFD40-2501F

FL1

FL1

FL1

XS16

CON6

C102

47u/35V

1
2
3
4
5
6

4.7K/0.25W

VD101

5.6V

VD103

30V

+5V

C124
220u/16V

R101

VD104

-30V

10K

R141

P14

1N4148

VD105

C103

104

P15

1N4148

10K

R142

P13

VD106

1N4148

S101 standby

S102 standby

P4

P5

P6

P7

P8

P9

P10

P11

P12

P13

P14

P15

VD102
1N4004

R102

100/0.5W

C101

470u/35V

R139

S8050

S8050

VD114

5.6V

XP16

CON6

1
2
3
4
5
6

R140 10

10

C123
470u/16V

V107

V106

P10

P11

P12

P13

P14

P15

P10

P11

P12

P13

P14

P15

SG13/GR1627SG14/GR1528SG15/GR1429SG16/GR1330SG17/GR1231SG18/GR11

26

SG12/KS12

25

SG11/KS11

24

SG10/KS10

23

SG9/KS9

22

SG8/KS8

21

SG7/KS7

20

SG6/KS6

19

SG5/KS5

18

SG4/KS4

17

SG3/KS3

16

SG2/KS2

15

SG1/KS1

14

VDD

13

10K

102

10K

10K

R103 10K

R104

R105

R106

C127

TOUCH SCREEN

S1

KEY

S2

KEY

S3

KEY

S4

KEY

S5

S6

S7

KEY

KEY

KEY

S8

KEY

EL

P1P2P3

C128 102

P1P2P3P4P5P6P7P8P9

NCNCNCNCNCG1G2G3G4G5G6G7G8G9G10

P1P2P3P4P5P6P7P8P9

G4G5G6G7G8

G1G2G3

33

34

32

36

GR837GR738GR6

VEE

VDD

SG19/GR1035SG20/GR10

N101

UPD16311

C105

C104

C106

101

101

VD108
LED-BK

XS14

XP14

1

1

2

2

3

3

CON3

CON3

G1G2G3G4G5G6G7G8G9

39

GR5
GR4
GR3
GR2
GR1

VDD
LED5
LED4
LED3
LED2
LED1

GND

OSC

SW11SW22SW33SW44DOUT5DIN6NC7CLK8STB9K110K211K312K4

R107 100

R108 100

R109 100

101

R133

330

40
41
42
43
44
45
46
47
48
49
50
51
52

R123
56K

C113

104

R134
120

G11

G10

G11

G12

C125
221

C110

G9

47n

G10

G11

G12

G13

R136

4.7K

R125

10K

D+5V

LED1 LED2

V102

2N5401

R126

330

VD107

LED-BK

R132

1K

G12

G13

G14

G15

G16

G17

G18

G19

G20

G21

G22

G23

G24

P31

G13

D+5V

G25NCNCNCNCNCP31

G14

G15

G16

G17

G18

G19

G20

G21

G22

G23

G24

G25

C126

R122

10

C111

47u/16V

221

P19

P20

P21

P22

P23

P24

P25

P26

P27

P28

P29

P30

26
25
24
23
22
21
20
19
18
17
16
15
14

P16

P17

P18

P19

P16

P17

P18

P19

P20

P31

P18

P16

P17

SG13/GR1627SG14/GR1528SG15/GR1429SG16/GR1330SG17/GR1231SG18/GR11

SG12/KS12
SG11/KS11
SG10/KS10
SG9/KS9
SG8/KS8
SG7/KS7
SG6/KS6
SG5/KS5
SG4/KS4
SG3/KS3
SG2/KS2
SG1/KS1
VDD

P20

G14

P21

P21

P22

G15

32

UPD16311

P22

P23

P23

33

34

VDD

N102

P24

P25

P24

P25

P26

G16

G17

36

VEE

SG19/GR1035SG20/GR10

P26

P27

P27

G18

G19

GR837GR738GR6

13

R111

R113

R112

R110

R124

10K

R127

120

V101

2N5401

4.7K

4.7K

C122

221

C120

47u/16V

C115

272

V108
2N5551

C109

4.7K

4.7K
101

R114

R144
1K

+5V

VD113
1N4004

N104

1

VCC

2

TRIG

3

LEVEL
LH24HF/2

473

C122

IMP8004L

C108

101

R115

100

PMPL

DCHG

GND

R116

100

100

L100

R145

8
7

C130

1k

6
5

P28

221

P28

G20

39

VDD
LED5
LED4
LED3
LED2
LED1

GND

FL2

FL2

FL2

R11810k

V103

2N5401

R119

P29

P30

FL2

FL2

FL2

P29

P30

10K

R121

33K

P31

40

G21

GR5

41

G22

GR4

42

G23

GR3

43

G24

GR2

44

G25

GR1

45
46
47
48
49
50
51
52

OSC

R130

SW11SW22SW33SW44DOUT5DIN6NC7CLK8STB9K110K211K312K4

R128

56K

47

3

2

C112

C107

47u/16V

C117

101

104

V104
S8050

R131

V105
A42

1K/0.25W

VD111
1N4148

VD112
1N4148

D+5V

N103

REMOT

VS

GND

OUT

R148

10K

D+5V

R129

R146

R147

10K

4.7K

4.7K

1

OK-SW

XP10

10

FROM SIGNAL

9

P_REM

8

P_DCK

7

P_DDA

6

P_DST2

5

P_DST1

4

DGND

3

DGND

2

+5V

C131

C114
47u/16V

47n

1

CON10

123456

F

E

D

C

B

A