Sharp SD-EX200 (serv.man19) Service Manual ▷ View online
– 9 –
SD-EX200H
Figure 9-2
ADJUSTMENT
Figure 9-1 OUTPUT OFFSET LEVEL
1-bit amplifier's output offset voltage adjustment
Adjust VRA100 and VRA101 so that the DC voltage between
speaker terminals + and - is set to 0
speaker terminals + and - is set to 0
±
5 mV at AC 230 V.
Electronic
Voltage
SO421
AC 230 V
Set
Output:
Speaker Terminal
Speaker Terminal
+
-
VR : 0
Input : AUX
Input : AUX
DESCRIPTION OF CIRCUIT FOR 1-BIT UNIT
(SEE THE WIRING DIAGRAMS ON PAGES 26 AND 27.)
L-CH Output
Offset Adjustment
Offset Adjustment
R-CH Output
Offset Adjustment
Offset Adjustment
VRA101
VRA100
1-BIT AMP. PWB
1-BIT AMP. SECTION
CD SECTION
Adjustment
Since this CD system incorporates the following automatic
adjustment functions, readjustment is not needed when
replacing the pickup. Therefore, different PWBs and pickups
can be combined freely.
Each time a disc is changed, these adjustments are preformed
automatically. Therefore, playback of each disc can be
preformed under optimum conditions.
adjustment functions, readjustment is not needed when
replacing the pickup. Therefore, different PWBs and pickups
can be combined freely.
Each time a disc is changed, these adjustments are preformed
automatically. Therefore, playback of each disc can be
preformed under optimum conditions.
Input section
Signals from CNA101 are coupled by CA100 and CA101 and
then sent into the A/D converter IC (ICA100).
Signals from CNA101 are coupled by CA100 and CA101 and
then sent into the A/D converter IC (ICA100).
modulation 1-bit converter
Signals from the A/D converter IC (ICA100) are converted to
1-bit signals and sent differentially. Refer to the technical
manual of SM-SX100 for the details of conversion to 1-bit
signals.
Signals from the A/D converter IC (ICA100) are converted to
1-bit signals 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 converted 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.
1-bit signals switched by the output IC (ICA101 and ICA102)
are converted 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) oscillate 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.
The 1-bit signals switched by the output IC (ICA101 and
ICA102) oscillate 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.
SD-EX200H
– 10 –
TO CHECK AND CANCEL PROTECT CIRCUIT DETECTION LINE
TEST MODE
1: In this model the microcomputer (IC701) detects the following
malfunctions once power is supplied, and cuts off power
from all the parts except for the circuit driving the
microcomputer.
from all the parts except for the circuit driving the
microcomputer.
1
Abnormal drop in the output voltage of each regulator
(below approx. 1.5 V)
Power is cut off instantly without display.
Power is cut off instantly without display.
2
Output offset over voltage of the 1-bit amplifier
(above approx. DC 2 V)
3
Mains overvoltage of the 1-bit amplifier
(above approx. DC 5.5 A)
Power is cut off instantly without display.
Power is cut off instantly without display.
4
Defects in the cooling fan or its drive circuit
(when stopped)
Power is cut off after “FAN LOCK” is displayed.
Power is cut off after “FAN LOCK” is displayed.
2: Criteria for abnormality, and checking and cancelling the
detection line
The criteria:
The criteria:
1
The voltage of pin 6 (PROTECT) on IC701.
2
The voltage of pin 32 (OFFSET) on IC701: Low (below
approx. 1 V) (abnormal) and High (above approx. 2.5
V) (normal) .
V) (normal) .
3
The motor stops when it is above approx. 1 V.
If the voltage of pin 10 (FAN LOCK) on IC701 is not
between approx. 0.21 V and 0.9 V whilst the motor
rotation is controlled, it is judged as abnormal.
between approx. 0.21 V and 0.9 V whilst the motor
rotation is controlled, it is judged as abnormal.
Checking and cancelling the detection line:
Caution: If the PROTECT/OFFSET detection line is
disconnected in case of
1
,
2
or
3
above, a
protective operation does not function. The
disconnection by output short-circuit of each
regulator may cause the parts or PCBs to burn
out and therefore do not disconnect the detection
line when the cause is not identified.
(Power supply can be detected with an
oscilloscope or like during approx. 0.5 seconds
after an abnormality is found. Note that the
detection would be difficult with a tester as the
voltage rises and falls rapidly.)
disconnection by output short-circuit of each
regulator may cause the parts or PCBs to burn
out and therefore do not disconnect the detection
line when the cause is not identified.
(Power supply can be detected with an
oscilloscope or like during approx. 0.5 seconds
after an abnormality is found. Note that the
detection would be difficult with a tester as the
voltage rises and falls rapidly.)
1
1
1
1
1
Abnormal drop in the output voltage of each regulator
Connect a measuring device (such as an oscilloscope) to
the stabilizing output of the regulator, and turn on the unit.
If the detected voltage is extremely lower than the voltage
on the circuit diagram (below approx. 1.5 V), the regulator
itself or the circuit is defective.
the stabilizing output of the regulator, and turn on the unit.
If the detected voltage is extremely lower than the voltage
on the circuit diagram (below approx. 1.5 V), the regulator
itself or the circuit is defective.
2
2
2
2
2
Output offset overvoltage of the 1-bit amplifier
Adjust the voltage of the output offset. If a protective
operation is still activated, ICA401 on the 1-bit amplifier
could be defective (the detection circuit of the speaker
output DC voltage).
operation is still activated, ICA401 on the 1-bit amplifier
could be defective (the detection circuit of the speaker
output DC voltage).
During POWER OFF Mode, push below each 2 buttons and [POWER] button.
Then enter to each TEST MODE.
Then enter to each TEST MODE.
Version Display
Other Destination : [ME**** ]
Version Display : ME0701A_ (07: MONTH; 01: DAY; A/B/C (MICOM VERSION)
Version Display : ME0701A_ (07: MONTH; 01: DAY; A/B/C (MICOM VERSION)
Notes:
Micom version will be display when entering to Button and Display Test Mode only. (Display for 2 seconds)
Micom version will be display when entering to Button and Display Test Mode only. (Display for 2 seconds)
No.
Key
Test Mode
1
[SKIP UP] + [VOLUME DOWN]
ALL CLEAR (RESET)
2
[CD STOP] + [SKIP UP]
BUTTON & DISPLAY TEST
3
[CD PLAY/PAUSE] + [AUX]
CD TEST
4
[CD PLAY/PAUSE] + [SKIP UP]
CD TRAY AGING TEST
5
[TUNER (BAND)] + [VOLUME DOWN]
TUNER PRESET MEMORY CLEAR
6
[TUNER (BAND)] + [VOLUME UP]
TUNER PRESET MEMORY FOR PRODUCTION
7
[TUNER (BAND)] + [CD STOP]
RDS TUN SM
8
[AUX] + [VOLUME UP]
AUX TEST
– 11 –
SD-EX200H
•
The indicated voltage in each section is the one measured
by Digital Multimeter between such a section and the chas-
sis with no signal given.
1. In the tuner section,
sis with no signal given.
1. In the tuner section,
indicates AM
indicates FM stereo
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.
3. In the deck section, a tape is being played back.
( ) indicates the record state.
4. In the power section, a tape is being played back.
5. In the CD section, the CD is stopped.
5. In the CD section, the CD is stopped.
•
Parts marked with “
1
” ( ) are important for
maintaining the safety of the set. Be sure to replace these
parts with specified ones for maintaining the safety and
performance of the set.
parts with specified ones for maintaining the safety and
performance of the set.
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 resistor. Besides, the one with “Fusible” is a fuse
type.
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 resistor. 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 symbol 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
symbol P means pico-farad and the unit of the capacitor
without such a symbol 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.
notice.
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
TYPES OF TRANSISTOR AND LED
2SB709 AR
2SD601 AR
KRA102 S
KRC102 S
KRC104 S
KRC107 S
KTA1504 GR
KTC3875 GR
2SD601 AR
KRA102 S
KRC102 S
KRC104 S
KRC107 S
KTA1504 GR
KTC3875 GR
AG01Z
AK09
DS1SS133
EK19
D1NL20U
AK09
DS1SS133
EK19
D1NL20U
B
(3)
E
(1)
C
(2)
TOP
VIEW
KDS226
MA132WA
MA132WK
MA132WA
MA132WK
TOP VIEW
TOP VIEW
TOP VIEW
2SK246 GR
KTA1023 Y
KTA1266 GR
KTA1270 Y
KTA1271 Y
KTC2874 B
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
GD1N4004
MA111
D5SB60
A C
A C
VIEW
FRONT
FRONT
VIEW
VIEW
304BC2E9
304HT2P
304VT2E2
A503BC2E
304HT2P
304VT2E2
A503BC2E
SARS03
KTC3199 GR
KTC3203 Y
KRA107 M
KRC102 M
KRC104 M
KRC107 M
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
REF. NO
DESCRIPTION
POSITION
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
SD-EX200H
– 12 –
Figure 12 BLOCK DIAGRAM (1/6)
+7.9V
Q84
DIGITAL OUT
CONTROL
LEVEL_CONT
TO 1-BIT AMP./
PROTECT CIRCUIT
SECTION
PROTECT CIRCUIT
SECTION
CNP501
TO DISPLAY SECTION
PROTECT
A/D_RESET
OFFSET PROTECT
TUN_SM
TUN_DO
TUN_CLK
TUN_DI
TUN_CE
TO TUNER UNIT
A_GND
TUN_CE
TUN_DI
TUN_CLK
TUN_DO
TUN_L
VCC_9V
TUN_R
TUN_SM
FM_DET
A_GND
ICT21
LC72723
RDS DECODER
+5V
+9V
QT21
MPXIN
VDDA
VDDD
RDS_DATA
RDS_CLK
RDS_RDY
RDS_RST
RD_RDY
RDCL
RDDA
RST
4.332 MHz
XT21
X_IN
X_OUT
DIG_FUNC
R
L
LOUT
A3.3V
ROUT
16MOUT
LRCK
BCK
DATA
L_C
TUNER
GP351TZ
IC4
DIGITAL OUT
VCONT
REV
FWD
VO5—
VO5+
VO3—
VO3+
VO4—
VO4+
FD0
TDO
+5V
VDD
VVDD
MUTING
Q82
Q2
+7.9V
LID_SENS
VDD5
CONT5
SLDO
SPDO
TIN2
TIN1
FIN2
FIN1
RVDD
XVDD
—
OUT2
OUT1
VCC
IC2
LA6574H
FOCUS/
TRACKING/
DRIVER
SW4
PICKUP IN
M
M
M801
SLED
MOTOR
M802
SPINDLE
MOTOR
IC1
LC78646E
CD SERVO
+3.3V
SPIN/SLED
REG
IN
IN
IC3
LM358D
OP-AMP.
VCC
DATA
BCK
LRCK
16MOUT
CONT3
CONT2
VCONT
FD0
TD0
TD0
VREF
LDD
PD
ADAVDD
LVDD
RFVDD
XOUT
XIN
XL1
16.9344 MHz
Q1
LASER DRIVER
+3.3V
M
—
+
Q3
CONSTANT
VOLTAGE
VOLTAGE
VREF
—
+
+
IC101
CS4340KS
DAC IC
FOCUS COIL
TRACKING COIL
PICK UP UNIT
CD_WRQ
CD_DRF
CD_CE
CD_DO
CD_DI
CD_CLK
CD RES
CE
CLK
DI
DO
WRQ
RES
DRF
1
65
8
19
14
11
26
66
37
8
40
43
44
18
33
32
34
31
25
24
23
22
10
24
9
79
49
3
4
20
19
18
51
12
1
6
4
5
22
23
20
7
61
7 6
41
64
39
3
69
2 3 4
2
5
4
3
6
71
50
7
10
3
11
27
2
3
67
48
57
68
54
8
26
75
46
47
19
5
13
14
16
15
4
14
30
21
29
13
60
15
1 7
28
11
22
56
2
1
59
2
1
80
63
21
11
5
2
8 9
11
21
25
28
15
12
12
8
9
9
8
10
70
62
38
77
55
28
27
26
58
1
2
4
3
72
10
1 7
5
M1
CD DOOR
MOTOR
+7.9V
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