Sharp SD-EX220 (serv.man2) Service Manual ▷ View online
SD-EX220H
5 – 1
Audio
SD-EX220H
Service Manual
Market
E
CHAPTER 5.
CIRCUIT DESCRIPTION
[1] Notes on schematic diagram
•
Resistor:
To differentiate the units of resistors, such symbol as K and M are
used: the symbol K means 1000 ohm and the symbol M means
1000 kohm and the resistor without any symbol is ohm-type resis-
tor. Besides, the one with “Fusible” is a fuse type.
To differentiate the units of resistors, such symbol as K and M are
used: the symbol K means 1000 ohm and the symbol M means
1000 kohm and the resistor without any symbol is ohm-type resis-
tor. Besides, the one with “Fusible” is a fuse type.
•
Capacitor:
To indicate the unit of capacitor, a symbol P is used: this symbol P
means pico-farad and the unit of the capacitor without such a sym-
bol is microfarad.
As to electrolytic capacitor, the expression “capacitance/withstand
voltage” is used.
(CH), (TH), (RH), (UJ): Temperature compensation
(ML): Mylar type
(P.P.): Polypropylene type
To indicate the unit of capacitor, a symbol P is used: this symbol P
means pico-farad and the unit of the capacitor without such a sym-
bol is microfarad.
As to electrolytic capacitor, the expression “capacitance/withstand
voltage” is used.
(CH), (TH), (RH), (UJ): Temperature compensation
(ML): Mylar type
(P.P.): Polypropylene type
•
Schematic diagram and Wiring Side of P.W.Board for this model are
subject to change for improvement without prior notice.
subject to change for improvement without prior notice.
•
The indicated voltage in each section is the one measured by Digi-
tal Multimeter between such a section and the chassis with no sig-
nal given.
tal Multimeter between such a section and the chassis with no sig-
nal given.
1. In the tuner section,
indicates AM
indicates FM stereo
indicates AM
indicates FM stereo
2. In the main section, a tape is being played back.
3. In the deck section, a tape is being played back.
( ) indicates the record state.
( ) indicates the record state.
4. In the power section, a tape is being played back.
5. In the CD section, the CD is stopped.
•
Parts marked with “
” ( ) are important for main-
taining the safety of the set. Be sure to replace these parts with
specified ones for maintaining the safety and performance of the
set.
specified ones for maintaining the safety and performance of the
set.
[2] Types of transistor and LED
REF NO.
DESCRIPTION
POSITION
SW4
PICKUP IN
ON-OFF
SW601
VOLUME DOWN
ON-OFF
SW602
VOLUME UP
ON-OFF
SW604
SKIP/TUNING UP
ON-OFF
SW606
AUX
ON-OFF
SW607
TUNER (BAND)
ON-OFF
SW608
STOP
ON-OFF
SW609
ON/STAND-BY
ON-OFF
SW610
OPEN/CLOSE
ON-OFF
SW611
BASS/TREBLE
ON-OFF
SW612
SKIP/TUNING DOWN
ON-OFF
SW615
PLAY/PAUSE
ON-OFF
SW771
CD DOOR OPEN/CLOSE
ON-OFF
2SB709 AR
2SD601 AR
KRA102 S
KRC102 S
KRC104 S
KRC107 S
KTA1504 GR
KTC3875 GR
AG01Z
AK09
DS1SS133
EK19
D1NL20U
B
(3)
E
(1)
C
(2)
TOP
VIEW
KDS226
MA132WA
MA132WK
TOP VIEW
TOP VIEW
TOP VIEW
2SK246 GR
KTA1023 Y
KTA1266 GR
KTA1270 Y
KTA1271 Y
KTC2874 B
VIEW
FRONT
E C B
VIEW
FRONT
1 2 3
(S)(G)(D)
(1)(2)(3)
SFPW56
GD1N4004
MA111
D5SB60
AC
AC
VIEW
FRONT
FRONT
VIEW
VIEW
304BC2E9
304VT2E2
A503BC2E
SARS03
KTC3199 GR
KTC3203 Y
KRA107 M
KRC102 M
KRC104 M
KRC107 M
VIEW
FRONT
Cathode Anode
FMLG12S
1. Anode
2. No Contact
3. Cathode
2. No Contact
3. Cathode
SD-EX220H
5 – 2
[3] Description of circuit for 1-bit unit (See the wiring diagrams on pages 6-16 and 6-17)
Input section
Signals from CNA101 are coupled by CA100 and CA101 and then sent
into the A/D converter IC (ICA100).
into the A/D converter IC (ICA100).
∆Σ modulation 1-bit converter
Signals from the A/D converter IC (ICA100) are converted to 1-bit sig-
nals and sent differentially. Refer to the technical manual of SM-SX100
for the details of conversion to 1-bit signals.
nals and sent differentially. Refer to the technical manual of SM-SX100
for the details of conversion to 1-bit signals.
Low pass filter circuit
1-bit signals switched by the output IC (ICA101 and ICA102) are con-
verted to analog signals through the lowpass filter consisting of LA101
~ LA107. The low pass filter functions when a frequency exceeds 20
kHz, and reduces it by approx. 3 dB when it reaches approx. 40 kHz.
verted to analog signals through the lowpass filter consisting of LA101
~ LA107. The low pass filter functions when a frequency exceeds 20
kHz, and reduces it by approx. 3 dB when it reaches approx. 40 kHz.
Dynamic feedback circuit
The 1-bit signals switched by the output IC (ICA101 and ICA102) oscil-
late between positive and negative voltage. After resistance-division,
the signals are fed back to the A/D converter IC (ICA100) through NF
resistance 75 kohms (RA155 ~ RA158). The peak-to-peak voltage
reaches approx. 5 V.
late between positive and negative voltage. After resistance-division,
the signals are fed back to the A/D converter IC (ICA100) through NF
resistance 75 kohms (RA155 ~ RA158). The peak-to-peak voltage
reaches approx. 5 V.
[4] Waveforms of 1-bit circuit
T
2
1
2.00V/div
500 ns/div
194.545465 µs
520 mV
2.00V/div
AD IC Output
+ Side
- Side
5 V
Amplitude
from 0 to 5 V
from 0 to 5 V
1
2
2
2
1
2.00 V/div
500 ns/div
194.545465 µs
-12.30 V
2.00 V/div
AD IC NF IN
In partial pressure OUT, 4 to 7 V amplitude
of GND reference is observed.
In IC of 75 kohms, the reference is 2.5 V
because of VREF. Due to imaginary GND
of operational amplifier inside IC, the
waveform cannot be monitored.
This waveform is partial pressure OUT.
of GND reference is observed.
In IC of 75 kohms, the reference is 2.5 V
because of VREF. Due to imaginary GND
of operational amplifier inside IC, the
waveform cannot be monitored.
This waveform is partial pressure OUT.
3
4
T
2.00 V/div
50.0 ns/div
0.0 s
-12.30 V
2.00 V/div
LEVEL SHIFT OUT
DEAD TIME
ZOOM UP
Dead time is generated by level
shift input.
Leading edge is delayed at CR,
passing R at DI.
Set value: 20 - 25 nsec.
shift input.
Leading edge is delayed at CR,
passing R at DI.
Set value: 20 - 25 nsec.
5
6
6
T
10.0 V/div
500 ns/div
194.545465 µs
-12.3 V
10.0 V/div
+ SIDE
+ FETOUT
- SIDE
Waveforms before low-pass filters at both
ends of the speaker.
H-bridge may be considered as BTL.
However, here and at the gate drive, dead
time is not observed; since bootstrap
operates based on output, DEAD TIME
part is in floating condition. The waveform
on the HIGH side shows that only the
booted voltage lowers.
ends of the speaker.
H-bridge may be considered as BTL.
However, here and at the gate drive, dead
time is not observed; since bootstrap
operates based on output, DEAD TIME
part is in floating condition. The waveform
on the HIGH side shows that only the
booted voltage lowers.
2
1
11
12
12
SD-EX220H
5 – 3
[5] Waveforms of CD circuit
T
FDO
TDO
Stopped
CH1=500 mV
DC 10:1
CH3=500 mV
DC 10:1
500 ms/div
(500 ms/div)
NORM:20 kS/s
1
3
=Record Length=
Smoothing : ON
CH1 :
0.000 V
CH2 :
0.0 V
Main :
100 K
Zoom :
2 K
Mode : AUTO
Type : EDGE CH1
Delay :
Type : EDGE CH1
Delay :
0.0 ns
Hold off :
0.2 µs
CH3 :
0.000 V
CH4 :
0.00 V
BW : FULL
=Trigger=
=Filter=
=Offset=
CH1
v/DIV
500 mV
500 mV
1
IC1 21
2
IC1 20
T
FDO
DRF
TE
Stopped
CH1=500 mV
DC 10:1
CH2=10 V
DC 10:1
DC 10:1
CH3=1 V
DC 10:1
500 ms/div
(500 ms/div)
NORM:20 kS/s
1
2
3
=Record Length=
Smoothing : ON
CH1 :
0.000 V
CH2 :
0.0 V
Main :
100 K
Zoom :
2 K
Mode : AUTO
Type : EDGE CH1
Delay :
Type : EDGE CH1
Delay :
0.0 ns
Hold off :
0.2 µs
CH3 :
0.00 V
CH4 :
0.00 V
BW : FULL
=Trigger=
=Filter=
=Offset=
-3 div
-1 div
0 div
+1 div
+3 div
CH Position To
CH2
Position
0.20 div
0.20 div
1
IC1 21
3
IC1 67
4
IC1 15
T
T
TE
DRF
Stopped
CH1=10 V
DC 10:1
CH2=1 V
DC 10:1
100 ms/div
(100 ms/div)
NORM:100 kS/s
2
1
=Record Length=
Smoothing : ON
CH1 :
0.0 V
CH2 :
0.00 V
Main :
100 K
Zoom :
2 K
Mode : NORMAL
Type : EDGE CH1
Delay :
Type : EDGE CH1
Delay :
2.924 ms
Hold off :
0.2 µs
CH3 :
0.00 V
CH4 :
0.00 V
BW : FULL
=Trigger=
=Filter=
=Offset=
3
IC1 67
4
IC1 15
Vp-p=1.0 V~1.3 V
0.5 mV/div,0.5 µsec/div
5
IC1 4
T
T
FDO
SPDO
Stopped
CH1=200 mV
DC 10:1
CH2=500 mV
DC 10:1
500 ms/div
1999/04/07 09:51:15
(500 ms/div)
NORM:20 kS/s
2
1
=Record Length=
Smoothing : ON
CH1 :
0.000 V
CH2 :
0.000 V
Main :
100 K
Zoom :
2 K
Mode : NORMAL
Type : EDGE CH2
Delay :
Type : EDGE CH2
Delay :
2.924 ms
Hold off :
0.2 µs
CH3 :
0.00 V
CH4 :
0.00 V
BW : FULL
=Trigger=
=Filter=
=Offset=
1
IC1 21
6
IC1 22
T
FDO
PDO2
PDO1
Stopped
CH1=500 mV
DC 10:1
CH3=1 V
DC 10:1
CH4=1 V
DC 10:1
500 ms/div
(500 ms/div)
NORM:20 kS/s
1
4
3
=Record Length=
Smoothing : ON
CH1 :
0.000 V
CH2 :
0.0 V
Main :
100 K
Zoom :
2 K
Mode : AUTO
Type : EDGE CH2
Delay :
Type : EDGE CH2
Delay :
0.0 ns
Hold off :
0.2 µs
CH3 :
0.00 V
CH4 :
0.00 V
BW : FULL
=Trigger=
=Filter=
=Offset=
CH1
v/DIV
500 mV
500 mV
1999/04/05 17:33:17
1
IC1 21
7
IC1 73
8
IC1 74
T
T
DOUT
Stopped
CH1=2 V
DC 10:1
500 ns/div
1999/04/07 09:25:28
(500 ns/div)
NORM:200 MS/s
1
=Record Length=
Smoothing : ON
CH1 :
0.00 V
CH2 :
0.00 V
Main :
1 K
Zoom :
100
Mode : NORMAL
Type : EDGE CH1
Delay :
Type : EDGE CH1
Delay :
2.887 ms
Hold off :
0.2 µs
CH3 :
0.00 V
CH4 :
0.00 V
BW : FULL
=Trigger=
=Filter=
=Offset=
9
IC1 39
T
T
DATA
DATACK
LRSY
Stopped
CH1=2 V
DC 10:1
CH2=2 V
DC 10:1
CH3=2 V
DC 10:1
5 µs/div
(5 µs/div)
NORM:100 kS/s
1
2
3
=Record Length=
Smoothing : ON
CH1 :
0.00 V
CH2 :
0.00 V
Main :
5 K
Zoom :
100
Mode : AUTO
Type : EDGE CH3
Delay :
Type : EDGE CH3
Delay :
0.0 ns
Hold off :
0.2 µs
CH3 :
0.00 V
CH4 :
0.00 V
BW : FULL
=Trigger=
=Filter=
=Offset=
CH3
v/DIV
2 V
1999/04/05 20:50:17
10
IC1 58
IC1 59
IC1 60
11
12
SD-EX220H
5 – 4
[6] Voltage
PIN NO. VOLTAGE
1
0 V
0 V
0 V
2
3
3
0 V
4
0 V
4.52 V
4.52 V
5
6
6
4.57 V
4.50 V
4.50 V
7
8
8
4.50 V
9
4.50 V
10
4.50 V
11
4.50 V
12
4.50 V
13
4.50 V
14
4.50 V
15
4.50 V
16
4.50 V
17
4.52 V
18
4.50 V
19
4.50 V
20
4.52 V
21
4.52 V
22
4.52 V
23
9 V
24
0 V
IC501
PIN NO. VOLTAGE
PIN NO. VOLTAGE
1
5.05 V
51
0 V
2
5.05 V
0 V
0 V
52
53
54
53
54
0 V
3
4
5
4
5
0.81 V
0 V
55
0 V
0 V
0 V
6
5.09 V
56
0 V
7
2.26 V
57
25.99 V
8
2.38 V
0 V
0 V
58
59
59
-25.99 V
-25.99 V
-25.99 V
9
10
0 V
60
-25.99 V
11
5.21 V
61
-25.99 V
12
0 V
62
0 V
13
0 V
63
-25.99 V
14
2.39 V
64
0 V
15
4.76V
65
0 V
16
0 V
66
-22.76 V
17
0 V
67
0 V
18
4.79 V
68
0 V
19
4.69 V
69
0.32 V
20
4.85 V
70
0 V
21
0 V
71
1.01 V
22
2.16 V
72
25.99 V
23
2.30 V
73
0 V
24
4.87 V
74
0 V
25
0 V
75
25.89 V
26
0 V
76
0 V
27
0. V
77
25.98 V
28
4.87 V
78
0 V
29
0 V
79
22.66 V
30
0 V
80
0 V
31
5.05 V
81
22.80 V
32
33
33
5.12 V
82
-22.46 V
4.87 V
83
-22.56 V
34
3.79 V
84
-22.50 V
35
4.24 V
85
-0.10 V
36
1.10 V
86
-22.73 V
37
4.41 V
87
-22.73 V
38
0 V
88
-22.48 V
39
4.86 V
89
25.89 V
40
0 V
90
0 V
41
0 V
91
0 V
42
0 V
92
0 V
43
5.23 V
93
0.51 V
44
0 V
94
0 V
45
4.86 V
95
0 V
46
0 V
96
4.87 V
47
0 V
97
0 V
48
0 V
98
5.05 V
49
0 V
99
0 V
50
0 V
100
5.05 V
IC701
PIN NO. VOLTAGE
1
2.66 V
0.60 V
10.18 V
0.60 V
10.18 V
3
2
2
PIN NO. VOLTAGE
E
0 V
C
4.79 V
B
0 V
Q606
IC780
PIN NO. VOLTAGE
1
5.09 V
5.08 V
0 V
5.08 V
0 V
3
2
2
PIN NO. VOLTAGE
E
0 V
C
4.80 V
B
0 V
Q608
IC608
PIN NO. VOLTAGE
E
0 V
C
0.26 V
B
4.80 V
Q607
PIN NO. VOLTAGE
E
7.95 V
C
3.30 V
B
7.28 V
Q3
PIN NO. VOLTAGE
E
1.66 V
C
1.66 V
B
5.40 V
Q82
PIN NO. VOLTAGE
E
0 V
C
3.28 V
B
0 V
Q101
PIN NO. VOLTAGE
1
1.62 V
2
3
4
3
4
1.07 V
1.06 V
0.50 V
1.06 V
0.50 V
5
6
6
3.29 V
15.33 V
15.33 V
7
8
9
8
9
1.66 V
1.66 V
1.66 V
1.66 V
1.66 V
10
1.66 V
11
1.67 V
12
1.66 V
13
0 V
14
1.23 V
15
0 V
16
0 V
17
0 V
18
3.29 V
19
0 V
20
1.65 V
21
1.65 V
22
1.65 V
23
1.65 V
24
1.65 V
25
3.84 V
26
3.29 V
27
3.30 V
28
3.76 V
29
0 V
30
3.30 V
31
0 V
32
33
33
0 V
0 V
0 V
34
0 V
35
0 V
36
0 V
37
0 V
38
3.29 V
39
0 V
40
0 V
41
3.85 V
42
0 V
43
0 V
44
45
45
0 V
0 V
0 V
46
3.85 V
47
3.30 V
48
3.39 V
49
0 V
50
0 V
51
0 V
52
0 V
53
0 V
54
3.30 V
55
0 V
56
0 V
57
0 V
58
0 V
59
0 V
60
0 V
61
3.85 V
62
0 V
63
0 V
64
0 V
65
0 V
66
3.85 V
67
3.29 V
68
3.30 V
69
0 V
70
0 V
71
0 V
72
0 V
73
0 V
74
3.30 V
75
0 V
76
0 V
77
0 V
78
0 V
79
0 V
80
0 V
IC1
PIN NO.
VOLTAGE
1
2
3
2
3
7.87 V
0 V
0 V
0 V
0 V
3.55 V
3.62 V
3.62 V
3.60 V
3.57 V
4
5
6
7
8
5
6
7
8
3.55 V
3.63 V
3.63 V
9
10
3.54 V
11
3.54 V
12
7.89 V
13
1.66 V
14
1.66 V
15
1.67 V
16
1.67 V
17
1.65 V
18
1.67 V
19
7.20 V
20
0 V
21
1.67 V
22
7.87 V
23
1.67 V
24
1.67 V
25
3.88 V
26
0 V
27
4.78 V
28
4.78 V
IC2
PIN NO. VOLTAGE
1
2
3
4
5
2
3
4
5
2.25 V
0.25 V
0.25 V
0 V
2.26 V
0.25 V
0.25 V
0 V
2.26 V
6
2.26 V
7
2.26 V
8
6.21 V
IC3
PIN NO. VOLTAGE
1
2
3
4
5
2
3
4
5
-14.90 V
0 V
0 V
0 V
14.86 V
0 V
0 V
0 V
14.86 V
6
0 V
7
0 V
8
0 V
IC502
PIN NO. VOLTAGE
1
2
3
4
5
2
3
4
5
0 V
0 V
0 V
-5.24 V
0 V
0 V
0 V
-5.24 V
0 V
6
0 V
7
0 V
8
8.53 V
IC503
PIN NO. VOLTAGE
1
3.28 V
0 V
0 V
0 V
3.30 V
0 V
0 V
0 V
3.30 V
2
3
4
5
6
3
4
5
6
3.30 V
7
3.30 V
8
0 V
0 V
0 V
9
10
1.78 V
11
0 V
12
0 V
13
0 V
14
0 V
15
0 V
16
3.64 V
IC101
PIN NO. VOLTAGE
1
2.14 V
2.13 V
4.30 V
0 V
2.14 V
2.13 V
4.30 V
0 V
2.14 V
2
3
4
5
6
3
4
5
6
2.12 V
7
0 V
8
2.19 V
2.09 V
2.09 V
9
10
0 V
11
4.30 V
12
4.30 V
13
0 V
14
0 V
15
0 V
16
0 V
ICT21
PIN NO. VOLTAGE
E
3.30 V
C
0 V
B
3.28 V
Q1
PIN NO. VOLTAGE
E
2.90 V
C
3.21 V
B
7.25 V
Q84
PIN NO. VOLTAGE
E
4.89 V
C
5.56 V
B
7.46 V
Q2
PIN NO. VOLTAGE
1
19.02 V
2
0 V
3
8.94 V
IC401
PIN NO. VOLTAGE
1
19.03 V
2
0 V
3
11.90 V
IC400
PIN NO. VOLTAGE
1
19.02 V
2
0 V
3
7.95 V
IC402
PIN NO. VOLTAGE
E
8.95 V
C
5.87 V
B
8.91 V
Q536
PIN NO. VOLTAGE
E
0 V
C
5.64 V
B
0 V
Q538
PIN NO. VOLTAGE
E
0 V
C
0 V
B
0.65 V
Q539
PIN NO. VOLTAGE
E
0 V
C
5.02 V
B
0 V
Q400
PIN NO. VOLTAGE
1
9.00 V
2
0 V
3
5.09 V
IC934
PIN NO. VOLTAGE
1
20.20 V
2
0 V
3
9.00 V
IC933
PIN NO. VOLTAGE
1
6.92 V
2
35.10 V
3
0 V
IC931
PIN NO. VOLTAGE
E
2.29 V
C
2.26 V
B
0 V
Q545
PIN NO. VOLTAGE
E
0 V
C
0 V
B
0.69 V
Q547
PIN NO. VOLTAGE
E
0 V
C
0 V
B
0.69 V
Q548
PIN NO. VOLTAGE
E
-26.30 V
C
-54.90 V
B
-26.60 V
Q931
PIN NO. VOLTAGE
E
0 V
C
0.55 V
B
0 V
Q933
PIN NO. VOLTAGE
E
0 V
C
5.35 V
B
0 V
Q535
PIN NO. VOLTAGE
E
2.29 V
C
2.25 V
B
1.65 V
Q546
PIN NO. VOLTAGE
E
0 V
C
0 V
B
6.11 V
Q421
PIN NO. VOLTAGE
E
0 V
C
0 V
B
0.66 V
Q540
PIN NO. VOLTAGE
E
0 V
C
11.90 V
B
0 V
Q424
PIN NO. VOLTAGE
E
0 V
C
6.11 V
B
0 V
Q422
PIN NO. VOLTAGE
E
6.12 V
C
11.90 V
B
0 V
Q423
PIN NO. VOLTAGE
E
1.32 V
C
1.29 V
B
0 V
Q549
PIN NO. VOLTAGE
E
0 V
C
0 V
B
0.66 V
Q581
PIN NO. VOLTAGE
E
0 V
C
0 V
B
0.65 V
Q550
PIN NO. VOLTAGE
1
2
3
4
2
3
4
36.10 V
35.10 V
0 V
0 V
35.10 V
0 V
0 V
PC901
PIN NO. VOLTAGE
1
2
3
4
2
3
4
0 V
0.68 V
0 V
0 V
0.68 V
0 V
0 V
PC902
Click on the first or last page to see other SD-EX220 (serv.man2) service manuals if exist.