Page 1
Home Theatre System
Service Manual
Page 2
-2 -
MODEL:
HTS-999-311
Model No.: HTS-999-311
Version: 1.0
Page 3
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CONTENTS
SAFE OPERATION ................................................................................................................................. 4
TROUBLE SHOOTING ..........................................................................................................................5
FRONT PANEL CONTROL DIAGRAM................................................................................................ 9
AMPLIFIER DIAGRAM....................................................................................................................... 10
CIRCUIT DIAGRAM............................................................................................................................ 11
Model No.: HTS-999-311
Version: 1.0
Page 4
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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.
Model No.: HTS-999-311
Version: 1.0
Page 5
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 +
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 +
b. Check CD4053/4052
7. Amplifier with one channel output
a. Check the signal input
b. Check amplifier circuit
c. Check protecting circuit
40V (OK)
5V
-5 -
Model No.: HTS-999-311
Version: 1.0
Page 6
8. Output distortion
a. Check signal input
b. Check power +
c. Check amplifier circuit
d. Check protecting circuit
40V
-6 -
Model No.: HTS-999-311
Version: 1.0
Page 7
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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 ( +
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.
5.1V ) is natural.
Model No.: HTS-999-311
Version: 1.0
Page 8
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
Page 9
FRONT PANEL CONTROL DIAGRAM
-9 -
Model No.: HTS-999-311
Version: 1.0
Page 10
AMPLIFIER DIAGRAM
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Model No.: HTS-999-311
Version: 1.0
Page 11
87654321
U?
473 473
10K
332
8K2
10K
GND
2K2
2K2
B100K
10K
U?
B100K
1U
1U
561
561
823 332
823
4U7
100K
GND
GND
AV6-8.4-7
AUDIO
D
AC-3
C
B
A
47K
47K
47K
47K
47K
47K
47K
47K
47K
47K
47K
47K
1K
1K
1K
1K
1K
1K
1K
1K
1K
1K
1K
1K
REM
1P1
AV6-8.4-7
1P1
5V
22K
13
14
15
1
5
2
13
14
15
1
5
2
13
14
15
1
5
2
13
14
15
1
5
2
9014
22K 10K
104
U?
D4
AC 220V
!
U?
D4
!
1P4
6A250V~
U?
D4
5A
1F3
CAP
103
5A/40A250V~
1 2 3 4 5 6 7 8
39K
U?
12
X0
14
X1
15
X2
11
X3
1
Y0
5
Y1
2
Y2
4
Y3
6
INH
10
A
9
B
7
VEE
4052
U?
12
X0
13
X1
2
Y0
1
Y1
5
Z0
3
Z1
6
INH
11
A
10
B
9
C
7
VEE
4053
2 3
15
C
470U/35V
PT2249
X
Y
X
Y
Z
4
5
6
9
10
11
12
161
220U
1000U/50V
104
CAP
104
CAP
1000U/50V
2200U/50V
104
CAP
104
CAP
2200U/50V
104
CAP
3300U/50V
104
CAP
3300U/50V
GND
13
3
14
15
4
220 220
SB
C
C
C
C
C
C
4U7
4U7
10K
1
U?
LM7815CT
LM7915CT
U?
2
2200U/50V
C
C
2200U/50V
C
3300U/50V
C
3300U/50V
PT2253
L in
14
11
15
5
12
3
R in
3
6
L out
R out
4U7
47K
1K
1K
4148
Vin
Vin
+30V
0
-30
+40V
0
-40V
+28V
0
AC 6V
9014
GND
2
1
GND
4K74K7
+15V
-15V
GND
3
3
GND
9014
+15V
4U7
1U
10K
390/0.5W
+15V
0
-15V
GND
GND
GND
5V
100P
2K2
18K
4558
4U7
47K
39P
10K
Name
R CHANNEL
100P
100K
1K
IC1
GND
16
J?
1
220U104
15
2
14
47U
3
4
13
5
6
PT2399
12
11
104
10
7
9
8
104
4U7
U?
B100K
GND
4U7
U?
B100K
10K
4U7
100K
GND
GND
4U7
U?
B100K
10K
4U7
100K
GND
10K
10K
4K7
15K
10K
10K
100P
100P
GND
1K 10K
2K2
22K
IC1
22K
IC1
15K
10K
1U
1U
1U
10K
8K2
1K
1K
100P
4558
332
100P
47K
IC1
GND
U?
B50K
472
100P
22K
IC1
GND
Name
SURR R CHANNEL
Name
CENT CHANNEL
+40V
10K
1K
3K9 1K
4U7
5551
33K 33K
GND
VCC+28V
100K
5551
1K
47U
GND
100K 100K
101
33K
100U
47
5401
4148
100
5551
200
24
5401
1488
1488
5WR25
10
104
10uH
U?
SPEAKER
GND
D
3K9
1K
VFD
200
5WR25
-40V
C
100K
4148
10K
4148
3K9 1K
4U7
5551
1K
33K
GND
33K
IC1
IC1
100K
IC1IC1
AC AC
100K
47U
GND
GND
GND
1K
47
IC1
3K3 6K8
IC1
5551
5551
5401
101
1K
414833K
100
100U
3K9
1K
Title
A3
Date: 17-Dec-2003 Sheet of
File: D:\\WORK\2008AV.ddb高先德 Drawn By:
200
24
D1273
5401
200
Number RevisionSize
+30V
D1273
5WR25
5WR25
-30V
IC1
10K
10
104
IC1
U?
SPEAKER
GND
B
A
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