akira HTS-999-311 User manual

Home Theatre System
Service Manual

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Model No.: HTS-999-311
Version: 1.0
MODEL:
HTS-999-311

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Model No.: HTS-999-311
Version: 1.0
CONTENTS
SAFE OPERATION ................................................................................................................................. 4
TROUBLE SHOOTING .......................................................................................................................... 5
FRONT PANEL CONTROL DIAGRAM................................................................................................ 9
AMPLIFIER DIAGRAM....................................................................................................................... 10
CIRCUIT DIAGRAM ............................................................................................................................ 11

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Model No.: HTS-999-311
Version: 1.0
SAFE OPERATION
1. Protect voltage line
This equipment can produce output while operating at 2-channel mode.
It is important to preset the maximum volume to a safe level. The factory setting is 0db.
2. Be sure to connect to a correct voltage, which is AC240V 50Hz/60Hz
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 120V/240V 50Hz/60Hz 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 to it.

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Model No.: HTS-999-311
Version: 1.0
TROUBLE SHOOTING
1. No power
a. Check power cord correct connecting
b. Check the 120V/240 voltage switch is at the correct position
c. Check the power switch is ok
d. Check the 250V 5A safety tube is fine
e. Check the transformer is fine.
2. 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
3. Microphone no sound
2. Check the power supply
3. Check the Mic input
4. Check the echo
4. No radio
a. Check the power supply
b. Check the radio wire
c. Check the source input switch
5. VFD Display no display
a. Check the power 24V/6V
b. Check the VFD display
6. DVD no output
a. Check power +5V
b. Check CD4053/4052
7. Amplifier with one channel output
a. Check the signal input
b. Check amplifier circuit
c. Check protecting circuit

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Model No.: HTS-999-311
Version: 1.0
8. 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-999-311
Version: 1.0
TROUBLE SHOOTING
* Before repair, please make sure the local power supply is 220V~240V.
1. Cracking, Small sounds
Analyse:
a. If the input signal accompany with direct current, it possibility strikes the selecting IC CD4052,
then cause the sounds cracking, and small.
b. The electric capacitor 47uF/50V of center and surround output is invalidation by the effects of
temperature and humidity, then sounds will be small.
c. The possible damage parts: CD 4052 and PT2253
PT2253 function : Volume control
CD4052 function : Dual 4-channel Analog Multiplexer
d. Testing whether the IC CD4052\PT2253 power supply ( +5.1V ) is natural.
Solution : Change damage parts.
1. Hum sounds
Analyse:
Filter electric capacitor 3300uF/50V will be invalidation when it is at high voltage or high
temperature and humidity
Solution:
Change damage capacitor 3300uF/50V.
2. VFD display damage
Analyse:
a. Due to the working voltage of VFD is connecting to the transformer, if the voltage is too high ,
easy be burn out the VFD display.
b. The filament of the display is friability, so must avoid to strong shock, or more
c. easy mangles the display.
d. The possible damage parts : VFD display, electric capacitor 470uF/50V and diode IN4004.
Please refere to the Front panel control Diagram
e. Testing whether the power from transformer to the front panel controller is natural, AC22V and
AC6V.
Solution :
Change new parts instead of the damage parts.
After repairing, momently power on, observing whether the VFD is abnormity.

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Model No.: HTS-999-311
Version: 1.0
3. Front panel loses control, can not choose the input signal
Analyse:
a. Be interfered by strong electromagnetism or wavy power supply.
b. The working voltage is too high, or IC BA5049/LM324 is losing control by the temperature and
humidity.
c. The possible damage parts : IC BA5049, CD4052 and LM324 , please refer to the
Front panel control Diagram
IC BA5049 function : Remote receiver and decoder
CD4052 function : Dual 4- Channel Analog Multiplexer
LM324 function : Quad Operational Amplifier, VFD display driver.
Solution :
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 at a steady-voltage.
4. The parts big power transistor C5196 burn out
Analyse:
a. Refer to Amplifier Diagram to change the possible damage parts which caused by C5196 burnout.
(Test by digital multimeter to make judgement whether the parts are workable or not)
b. Series-wound connect one 40W bulb at the wavy power supply 220V/240V, it will react on
protecting when you are repairing.
c. Make sure changed all of the damage parts, then electrify, power on .
d. If 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,
please recheck there is any other damage parts).

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Model No.: HTS-999-311
Version: 1.0
FRONT PANEL CONTROL DIAGRAM

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Model No.: HTS-999-311
Version: 1.0
AMPLIFIER DIAGRAM

12345678
A
B
C
D
87654321
D
C
B
A
Title
Number RevisionSize
A3
Date: 17-Dec-2003 Sheet of
File: D:\\WORK\2008AV.ddb先德 Drawn By:
AUDIO
2
5
1
15
14
13
2
5
1
14
15
13
47K
47K
47K
47K
47K
47K
1K
1K
1K
1K
1K
AV6-8.4-7
1K 1P1
X0
12
X1
14
X2
15
X3
11
Y0
1
Y1
5
Y2
2
Y3
4
INH
6
A
10
B
9
VEE
7
X13
Y3
U?
4052
AC-3
2
5
1
15
14
13
2
5
1
14
15
13
47K
47K
47K
47K
47K
47K
1K
1K
1K
1K
1K
AV6-8.4-7
1K 1P1
X0
12
X1
13
Y0
2
Y1
1
Z0
5
Z1
3
INH
6
A
11
B
10
C
9
VEE
7
X14
Y15
Z4
U?
4053
Vin
1
GND
2
+15V 3
U?
LM7815CT
Vin
2
GND 1
-15V 3
U?
LM7915CT
101
100U
5551 5551
5401
33K 33K1K
200
24
200
47U
3K9 1K 47
1488
5551
5401
4148 10uH 33K
100
1K
3K9
10
104
GND
4U7 4558
100P
39P
47K
47K
10K
GND
1K
1K
4U7
4U7
9014
9014
4148
GND
4K74K7
PT2253
4U7
Lin
Rin
Lout
Rout
14
15
12
3
11
5
3
6
4U7
332
10K
4558
U?
SPEAKER
U?
B100K 10K
473 473
10K
8K2
332
8K2
U?
B100K
GND
100P
10K 4U7
GND IC1
100P
22K
100K
2K2
GND
4U7
10K
1K
U?
B100K
1488
5WR25
5WR25
GND
GND GND
+40V
-40V
Name
RCHANNEL
2200U/50V
C
U?
D4
2200U/50V
C
2200U/50V
C
2200U/50V
C
104
CAP
104
CAP
6A250V~
5A/40A250V~ 1P4
AC 220V
5A
1F3
!
!
GND 101
100U
5551 5551
5401
33K
33K 1K
200
24
200
47U
3K9 1K 47
D1273
5551
5401
414833K
100
1K
3K9
10
104
U?
SPEAKER
4U7
D1273
5WR25
5WR25
GND
GND
GND
+30V
-30V
Name
SURR RCHANNEL
Name
CENTCHANNEL
GND IC1
100P
22K
100K
2K2
GND
4U7
10K
1K
U?
B100K
GND
GND
IC1
100P
22K
100K
2K2
GND
4U7
10K
1K
U?
B100K
GND
4U7
4U7
4U7
561
16
14
15
561
13
12
11
10
9
823 332
823
1
3
2
4
5
6
7
8
220U104
390/0.5W J?
5V
47U
104
104
PT2399
+15V
18K
10K
10K
10K
10K
4K7
15K
IC1
100P
100K
10K
2K2
GND
1U
1K
GND 1U
472
1U
IC1
100P
47K
GND
1K
10K
15K
U?
B50K
1U
1U
1K 10K
1U
IC1
3K3 6K8
IC1
10K
IC1
1K
IC1
100K
GND
IC1
100K
IC1
10K
IC1IC1
4148
GND
100K 100K 100K
100K
VCC+28V
VFD
AC AC
4148
REM
22K
5V
9014
22K 10K
10K
SB
220 220
GND
PT2249
2 3
4
5
6
9
10
11
12
39K
220U
104
161
15
3300U/50V
C
U?
D4
3300U/50V
C
3300U/50V C
3300U/50V
C
104
CAP
104
CAP
1000U/50V
C
U?
D4
1000U/50V
C
104
CAP
104
CAP
103
CAP
+15V
-15V
0
+30V
0
-30
+40V
0
-40V
470U/35V
C
+28V
0
AC6V
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