Sharp HT-SB250 (serv.man2) Service Manual ▷ View online
HT-SB250
2 – 1
CHAPTER 2. ADJUSTMENTS
[1] Test Mode
1. Enter the Test Mode version display
While pressing down ON/STANDBY and VOL UP button, ON AC supply.
Version will be display on 7 segment as below:-
S2 --> XX --> D
Version will be display on 7 segment as below:-
S2 --> XX --> D
S2 = Model name, SB250
XX= version no.
D = Destination
XX= version no.
D = Destination
2. Enter Key and Display Test Mode
After enter Test Mode version display, Press VOL UP button.
1. All SOUND MODE LED will light ON
2. 7 segment display will light on if press button as below
2. 7 segment display will light on if press button as below
3. Exit the Test Mode
While in Test Mode function, Press ON/STANDBY button to exit.
4. Error Code Description
5. System Protection indicator
In case abnormal power detection has occurred, the unit will automatically enter to stand-by mode ON/Standby LED willl be
flashing as below:-
flashing as below:-
Unit enter Protect mode when irregular process occur on power supply line.
1. System Protect
2. AVCK Protect
2. AVCK Protect
Key
7 segment
VOL DOWN
01
VOL UP
02
SURROUND
03
FUNCTION
04
Display
Explanation
Solution
E1
Communication error between Micom and WM8775
> Unplug AC cord and turn power ON again
> Check line connected between Micom and corresponding IC
> Check line connected between Micom and corresponding IC
E2
Communication error between Micom and NJU26040
E3
Communication error between Micom and STA333
OFF
OFF
Flashing
Flashing
ON
ON
No.1
No.2
1 Frame
Fig. Example for No. 2 AVCK Protect
No.1
No.2
OFF
OFF
(3 Sec)
(3 Sec)
(3 Sec)
(3 Sec)
(3 Sec)
(Repeat)
HT-SB250
3 – 1
CD-ES700/CD-ES77
CD-ES700/CD-ES77
Service Manual
CD-ES700/CD-ES77
Market
E
CHAPTER 3. MECHANISM BLOCKS
[1] Disassembly
Caution On Disassembly
Follow the below-mentioned notes when disassembling the unit and reassembling it, to keep it safe and ensure
excellent performance:
1. Be sure to remove the power supply plug from the wall outlet before starting to disassemble the unit.
2. Take off nylon bands or wire holders where they need to be removed when disassembling the unit. After servicing
excellent performance:
1. Be sure to remove the power supply plug from the wall outlet before starting to disassemble the unit.
2. Take off nylon bands or wire holders where they need to be removed when disassembling the unit. After servicing
the unit, be sure to rearrange the leads where they were before disassembling.
3. Check that all speaker cushions (refer items 201-4, 201-5, 201-6, 201-7, 201-8 and 201-9 on pages 6 and 7 of
Parts Guide) are properly sealed otherwise vibration noise will be very distinct at low frequency sound.
Replace the cushions if they are found damaged during servicing.
Replace the cushions if they are found damaged during servicing.
STEP
REMOVAL
PROCEDURE
FIGURE
1. Wall Mount Bracket .......
2. Screw.............................
3. Screw.............................
4. Screw.............................
2. Screw.............................
3. Screw.............................
4. Screw.............................
1
Back Cabinet Assy
(A1)x2
(A2)x10
(A3)x9
(A4)x1
(A2)x10
(A3)x9
(A4)x1
1
2
Amp PWB
1. Screw..............................
2. Connector .......................
3. Socket ............................
2. Connector .......................
3. Socket ............................
(B1)x2
(B2)x1
(B3)x2
(B2)x1
(B3)x2
2
3
Power PWB
1. Main Chassis .................
2. Screw ............................
3. Screw.............................
4.
2. Screw ............................
3. Screw.............................
4.
Socket............................
5.
Screw.............................
(C1)x1
(C2)x4
(C3)x1
(C4)x1
(C5)x2
(C2)x4
(C3)x1
(C4)x1
(C5)x2
2
and Main PWB
4
Switch PWB
1. Screw.............................
(D1)x2
4
5
Woofer
1. Duct Port Holder ............
2. Duct Port Assy...............
3. Screw.............................
4. Screw.............................
2. Duct Port Assy...............
3. Screw.............................
4. Screw.............................
(E1)x2
(E2)x2
(E3)x12
(E4)x8
(E2)x2
(E3)x12
(E4)x8
3
3
3
4
3
3
4
6
Speaker
1. Screw.............................
(F1)x4
4
Back Cabinet Ass’y
(A3)x5
M3x10mm
(A2)x5
M3.5x10mm
M3.5x10mm
(A1)x1
Wall Mount Bracket
(A4)x1
M3x10mm
(A1)x1
Wall Mount Bracket
(A2)x5
M3.5x10mm
(A3)x4
M3x10mm
Front Cabinet Ass’y
Figure 1
HT-SB250
3 – 2
CAUTION:
TO REMOVE SPEAKER UNIT, PRESS THESE
LOCKING TABS.
TO RELEASESPEAKER WIRES.
LOCKING TABS.
TO RELEASESPEAKER WIRES.
SPEAKER UNIT
LOCKING TAB
LOCKING TAB
SPEAKER
WIRE
Front Cabinet Ass’y
Front Cabinet Ass’y
(B3)x1
(B3)x1
(C1)x1
Main Chassis
(C2)x4
M3x10mm
Amplifier PWB
(B2)x1
(B1)x2
Special Screw
(C3)x1
Special Screw
Figure 2
Power PWB
(C4)x1
(C5)x2
M3x8mm
(E3)x6
M3x10mm
(E1)x1
Duct Port Holder
Duct Port Holder
(E2)x1
Duct Port Assy
Figure 3
Figure 4
(E1)x1
Duct Port Holder
(E2)x1
Duct Port Assy
(E3)x6
M3x10mm
(F1)x2
M3x8mm
M3x8mm
Speaker
Woofer
Woofer
(E4)x2
M3x8mm
M3x8mm
(E4)x2
M3x8mm
M3x8mm
Switching PWB
(D1)x2
M3x10mm
(E4)x2
M3x8mm
(E4)x2
M3x8mm
Woofer
Woofer
(F1)x2
M3x8mm
Speaker
Front Cabinet Assy
Main PWB
HT-SB250
4 – 1
CHAPTER 4. DIAGRAM
[1] Block Diagram
XM601
36.864MHz
~
JK802 (LINE IN)
L
R
h
c
L
L
+B2
L
R
R
h
c
R
+B5
JK801 (AUDIO IN)
~
L
+B2
R
2
0
6
D
3
B
+
T
C
E
T
E
D
_
L
V
L
6
B
+
V
3
.
3
D
JK803
DZ801
V
0
2
/
A
5
B
2
5
K
S
V
0
.
5
A
R
O
T
P
A
D
A
1
B
+
N
I
C
D
12V 4A
+B1 +B4
DZ802
DZ803
5.6B
13A
+B5
~
+B3
2
0
8
D
1
0
8
D
4
B
+
+B2 +B1
+B3
UNSW 3.3
D604
~
+B6
D605
IC801
LD29080
3
2
2
IC803
AP2213
IC802
KIA1117F33L
4
3
2
IC601
WM8775
28
1
25
24
6
14
16
7
AVDD
DVDD
17
8
9
IC602
NJU260409
SRS WOW
1
7
25
5
9
12
13 28
32
4
2
2
3
6
7
8
IC605
PST8227N
3
2
1
Q601
RESET
1
3
35
POWER
17
18
14
19
6
26
27
27 28 30
8
+B1
+B2
23
24
15
20
21
36
DC_RLY
44
42
43
SYS
PROTECT
PROTECT
Q802
AMP_12V
DC_12V
XM603
32.768kHz
MICOM_UNSW
VREF
10
48
46
IC604
IXA229AW
SYSTEM
MICROCOMPUTER
IC603
TJM4558CD
38
1
4
18
21
3
8
Q605
Q604
Q602
17
19
18
22
3
5
8
VDD
1
10
11
14
16
~
2
4
5
2
1
3
10
11
FROM AC/DC
CNP302
CNP102
CNP803
CNP902
3
4
2
1
Q701
Q702
KEY
SW702-SW705
CNP502
D_GND
BI502
KEY
SW701
+B8
1
2
3
4
5
6
7
8
9
+B4
D_1.8V
DGND
DGND
+B3
D_3.3V
MICOM GND
+B9
UNSW_3.3V
DGND
D_5V
+B2
D_1.8V
1
2
3
4
5
6
1
2
3
4
5
6
1
2
3
4
5
6
7
8
9
2
0
3
W
W
N
C
Z
P
W
W
A
4
5
1
B
N
1
2
3
4
5
6
7
8
9
+B3
+B6
1
2
3
4
5
6
7
8
9
D_3.3V
DGND
DGND
2
0
7
D
E
L
D
R
S
5
6
1
L
C
AMP_GND
AMP_GND
AMP_GND
AMP_12V
AMP_12V
AMP_12V
+B2
+B3
REMOTE
SENSOR
SENSOR
1
2
3
Figure 4-1: BLOCK DIAGRAM (1/2)
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