akira HTS-393-001 User manual

Home Theatre System
Service Manual

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Model No.: HTS-393-001
Version: 1.0
MODEL:
HTS-393-001

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Model No.: HTS-393-001
Version: 1.0
CONTENTS
SAFE OPERATION ................................................................................................................................. 4
TROUBLE SHOOTING .......................................................................................................................... 5
CIRCUIT DIAGRAM .............................................................................................................................. 9
PART LIST ............................................................................................................................................. 12

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Model No.: HTS-393-001
Version: 1.0
SAFE OPERATION
1. Protect voltage line
It is important to preset the maximum volume to a safe level .The factory setting is 20dB.
2. Be sure to connect to a correct voltage, which is AC220V~240V 50Hz
If you are not sure of the power supply to your home, please consult your local AKIRA dealer or
the local power provider (It is AC 220V~240V 50Hz optional).
3. Please operate this equipment in an airy area
Keep it away from direct sunlight and high temperature area.
Do not operate from the box and ensure of sufficient air circulation during operation.
4. Protect power cord.
Do not place heavy object or stamp on the power cord. Don’t pull or push the power cord with
excessive force.
5. Do not drop metal objects into the equipment.
Avoid dropping metal objects like pin, needle and coin into the equipment as it will cause a short
circuit and damage the equipment.
6. Avoid water, dust and moisture.
Do not put the equipment in a dusty or misty place. Flower vase and other liquid container should
not be placed over it.
7. Avoid cleaning with volatile solution
Do not use any volatile solution to clean the equipment, which may cause damage it.

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Model No.: HTS-393-001
Version: 1.0
TROUBLE SHOOTING
FAULT REMEDY
NO POWER a. Check power cord correct connecting.
b. Check the 220V~240V-voltage switch is at the correct position.
c. Check the power switch is ok.
d. Check the 250V 6A-safety tube is fine.
e. Check the transformer is fine.
NO SOUND a. Check the power+40V(OK).
b. Check whether the protecting circuit (relay) is ok.
c. Check the Pre-amp circuit.
d. Check whether the source input switch is ok.
e. Check the source input connection.
MICROPHONE NO SOUND a. Check the power supply.
b. Check the Mic input.
c. Check the echo.
NO RADIO a. Check the power supply.
b. Check the radio wire.
LED DISPLAY NO DISPLAY a. Check the power AC 9V.
b. Check the LED display.
DVD NO OUTPUT a. Check power +5V.
b. Check CD4053/4052.
AMPLIFIER WITH ONE
CHANNEL OUTPUT
a. Check the signal input.
b. Check amplifier circuit.
c. Check protecting circuit.
OUTPUT DISTORTION a. Check signal input.
b. Check power+40V.
c. Check amplifier circuit.
d. Check protecting circuit.

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Model No.: HTS-393-001
Version: 1.0
Before repair, please make sure the local power supply is 220V~240V
SYMPTON ANALYSE SOLUTION
CRACKING, SMALL
SOUNDS
1. If the input signal accompany with
direct current, it possibility strides
the selecting IC CD4052, then
cause the sounds cracking, and
small.
2. The electric capacitor 47μF/50V
of center and surround output is
invalidation by the effects of
temperature and humidity then
sounds will be small.
3. The possible damage parts: MC
4052 and PT2315
PT2315 function: Volume control
CD4052 function: Dual 4-channel
Analog Multiplexer
4. Testing whether the IC
CD4052\PT2315 power supply
(+5.1V) is natural
Change damage parts.
HUM SOUNDS Filter electric capacitor 2200μF /25V
will be invalidation when it is at high
voltage or high temperature and
humidity.
Change electric capaciton 2200
μF /25V.
KARAOKE
ABNORMALITY
The possible damage parts: IC TL084
and IC PT2399, please refer to the Tone
control Diagram.
IC TL084 (1) function: MIC volume,
MIC bass, MIC treble contron
IC PT2399 function: OK ECHO, OK
DELAY contron.
Change new parts to instead of
the damage parts.
CETER AND
SURROUND
CHANNEL NO
OUTPUT
The possible damage parts: IC 4053 and
IC TL084, please refer to the Tone
control Diagram.
IC 4053 function: 2 channel and 6
channel selection
IC TL084(2) function: Ceter and
Surround channel plus control
Change new parts to instead of
the damage parts.

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Model No.: HTS-393-001
Version: 1.0
SYMPTON ANALYSE SOLUTION
LED DISPLAY BURN
OUT
1. Due to the working voltage of
LED and background light is
connecting to the transformer, if
the voltage is too high, easy be
burn out the LED display or
background light.
2. The filament of the display is
friability, so must avoid to strong
shock or more easy mangles the
display.
3. The possible damage parts: LED
display, electric capacitor 4700μ
F /50V ,IC HT1621B , please
refer to the Front panel control
Diagram.
4. Testing whether the power from
transformer to the front panel
controller is natural, AC22V and
AC6V.
5. Testing whether the power the
background light power supply
(+5V) is natural.
Change new parts instead of the
damage parts. After repairing
momentary power on, observing
whether the LED is abnormity.
FRONT PANEL
LOSES CONTROL,
CAN NOT CHOOSE
THE INPUT SIGNAL
1. Be interfered by strong
electromagnetism or wavy power
supply.
2. The working voltage is too high, or
CPU AT89C52 is losing control by
the temperature and humidity.
3. The possible damage parts:
PT2315, MC4052 and HT1621,
please refer to the front panel and
amplifier control Diagram.
CPU AT89C52 function: Remote
receiver and decoder
MC4052 function: Dual 4-Channel
Analog Multiplexer
HT1621 function: Quad
Operational Amplifier, VFD
display driver.
Testing whether the IC working
voltage (+5.1V) is natural.
Change new parts to instead of
the damage parts.
Place the player in the place
without electromagnetism
interfering. Operate the player al
a steady-voltage.

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Model No.: HTS-393-001
Version: 1.0
SYMPTON ANALYSE SOLUTION
THE PARTS BIG
POWER
TRANSISTOR C5198
BURN OUT
1. Refer to Amplifier Diagram to
change the possible damage parts
which caused by C5198 burnout
(Test by digital multimeter to make
judgement whether the parts are
workable or not).
2. Series-wound connect one 40W
bulb at the wavy power supply
220V/240V, it will react on
protecting when you are repairing.
3. Make sure changed all of the
damage parts, then electrify, power
on.
4. In the 40W bulb suddenly shinny,
then dinginess slowly (It indicates
that the player is work normally) If
the bulb is shinny all the way, then
there is still some short circuit on
the PBC. Pls. rechecks there is any
other damage parts).
Change new parts to instead of
the damage parts.

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Model No.: HTS-393-001
Version: 1.0
CIRCUIT DIAGRAM
AMP

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Model No.: HTS-393-001
Version: 1.0
TONE