Sharp QT-CD121H (serv.man2) Service Manual ▷ View online
– 9 –
QT-CD121H/112H
Figure 9 ADJUSTMENT POINTS
QT-CD121H
QT-CD112H
AM
TRACKING
fL
TRACKING
fL
FM DET.
T2
VCO
VR1
IC2
IC1
T1
FM IF
AM IF
L4
TC4
TC2
TC1
TC3
AM
TRACKING
fH
TRACKING
fH
L1
L2
AM BAND
COVERAGE
COVERAGE
FM
TRACKING
TRACKING
FM BAND
COVERAGE
COVERAGE
fH
fL
fH
fL
fH
fL
T3
FM ROD ANTENNA
MAIN PWB
1
1
13
17
19
19
21
L3
AM BAR
ANTENNA
MW
TRACKING
fL
TRACKING
fL
T2
VCO
VR1
IC2
IC1
T1
FM IF
AM IF
L4
L5
L6
TC4
TC2
TC1
TC3
L1
L2
TC6
FM DET.
T3
FM/SW ROD ANTENNA
1
1
13
17
19
19
21
L3
MW BAR
ANTENNA
MAIN PWB
TC5
MW BAND
COVERAGE
COVERAGE
fH
fL
SW
TRACKING
TRACKING
FM
TRACKING
TRACKING
FM BAND
COVERAGE
COVERAGE
fL
fH
fH
fL
SW BAND
COVERAGE
COVERAGE
fL
fH
fH
fL
MW
TRACKING
fH
TRACKING
fH
– 10 –
QT-CD121H/112H
CD SECTION
Since this CD system incorporates the following automatic
adjustment function, when the pickup is replaced, it is necessary
to reajust it.
Since this CD unit does not need adjustment, the combination
of PWB and laser pickup unit is not restricted.
adjustment function, when the pickup is replaced, it is necessary
to reajust it.
Since this CD unit does not need adjustment, the combination
of PWB and laser pickup unit is not restricted.
TEST MODE
While holding down the "STOP" button, move the FUNCTION/POWER switch to "CD".
Then, release the "STOP" button and, within 0.5 second, connect the TEST POINT to GND (within 0.5 second).
(See Fig. 10)
Then, release the "STOP" button and, within 0.5 second, connect the TEST POINT to GND (within 0.5 second).
(See Fig. 10)
Start
Note
1. When the CD LID switch is in the OFF position, the unit will be able to enter the test mode.
However, playback cannot be performed in this mode.
2. You can only move the pickup.
3. The LCD display should be the same as it is for normal CD operations.
3. The LCD display should be the same as it is for normal CD operations.
1
2
When the "PLAY" button is pressed, the laser will be lit, and when the "STOP" button is pressed, it will be
turned off. Playback will also start and stop when these buttons are pressed.
turned off. Playback will also start and stop when these buttons are pressed.
Turning the tracking servo on or off.
3
a. If the "PLAY" button is pressed while in the stop mode, the laser will simply be turned on at first.
b. If the laser is lit and the "PLAY" button is pressed again, playback will start from the current pickup position.
c. If the "STOP" button is pressed, playback will stop. When pressed again, the laser will be turned off.
b. If the laser is lit and the "PLAY" button is pressed again, playback will start from the current pickup position.
c. If the "STOP" button is pressed, playback will stop. When pressed again, the laser will be turned off.
a. Each time the PAUSE button is pressed during playback, the tracking servo will be turned on or off.
(Note: If the PLAY button is pressed while in the stop mode, the tracking servo will automatically be
turned on.)
(Note: If the PLAY button is pressed while in the stop mode, the tracking servo will automatically be
turned on.)
Operation
The use of the "UP/CUE" button will move the pickup to the outermost position.
The use of the "DOWN/REVIEW" button will move the pickup to the innermost position.
The use of the "DOWN/REVIEW" button will move the pickup to the innermost position.
While holding down the "STOP" button, move the FUNCTION/POWER switch to "CD".
Then, release the "STOP" button and, within 0.5 second, press the REVIEW/DOWN button.
Then, release the "STOP" button and, within 0.5 second, press the REVIEW/DOWN button.
Start
Display
LCD MODE
1
2
3
* After the number
3
has appeared in the display, each time the "UP/CUE" button is pressed, the display will switch
in the following order:
1
,
2
, and then
3
.
1 second
1 second
Figure 10
TEST
POINT
TO CD SECTION
2
3
1
C779 10/16
R779
47
R772
2.7K
R771
3.9K
R773
2.7K
SW772
STOP
SW771
PLAY/
REPEAT
RX771
SW774
TRACK DOWN/
REVIEW
10K
R776
R774
2.7K
SW773
TRACK UP/ CUE
REMOTE
SENSOR
4
1
+B
SWITCH PWB-A2
QT-CD121H
QT-CD112H
TEST
POINT
TO CD SECTION
R772
2.7K
R771
3.9K
R773
2.7K
SW772
STOP
SW771
PLAY/
REPEAT
SW774
TRACK DOWN/
REVIEW
10K
R776
R774
2.7K
SW773
TRACK UP/ CUE
3
1
+B
SWITCH PWB-A2
– 11 –
QT-CD121H/112H
NOTES ON SCHEMATIC DIAGRAM
1. Tuner
( ): AM mode
Marking except for ( ): FM mode
Marking except for ( ): FM mode
2. CD
( ): Play mode
Marking except for ( ): Stop state
Marking except for ( ): Stop state
3. Deck section
( ): Record mode
Marking except for ( ): Playback mode
Display / Control section:
( ): Active state
Marking except for ( ): CD Function mode at stop state
Marking except for ( ): Playback mode
Display / Control section:
( ): Active state
Marking except for ( ): CD Function mode at stop state
• Schematic diagram and Wiring Side of P.W.Board for this
model are subject to change for improvement without prior
notice.
notice.
• Parts marked with “ ” (
) 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.
• Resistor:
To differentiate the units of resistors, the 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 an
ohm resistor. The resistor designated "Fusible" is a fuse type
resistor
are used: the symbol K means 1000 ohm and the symbol M
means 1000 kohm and the resistor without any symbol is an
ohm resistor. The resistor designated "Fusible" is a fuse type
resistor
• Capacitor:
To indicate the unit of capacitor, a symbol P is used: this
symbol P means micro-micro-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 micro-micro-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
• The indicated voltage in each section is the one measured by
Digital Multimeter between such a section and the chassis
with no signal given.
with no signal given.
SW1
BAND (112H ONLY)
FM—MW—SW
SW102
RECODE/PLAYBACK
OFF—ON
SW201
FUNCTION/POWER
TAPE—AM—
FM AUTO—CD/
OFF—ON
FM AUTO—CD/
OFF—ON
SW202
SURROUND (121H ONLY)
OFF—ON
SW203
X-BASS
OFF—ON
SW601
TAPE MAIN
OFF—ON
REF. NO
DESCRIPTION
POSITION
SW702
PICKUP IN
OFF—ON
SW761
CD LID OPEN/CLOSE
OFF—ON
SW771
PLAY/REPEAT
OFF—ON
SW772
STOP
OFF—ON
SW773
TRACK UP/CUE
OFF—ON
SW774
TRACK DOWN/REVIEW
OFF—ON
Figure 11 TYPES OF TRANSISTOR
REF. NO
DESCRIPTION
POSITION
E C B
(S) (G) (D)
(1) (2) (3)
FRONT
VIEW
2SC1815 GR
E C B
FRONT
VIEW
S8050D
E B C
FRONT
VIEW
S9012H
QT-CD121H/112H
– 12 –
Figure 12 BLOCK DIAGRAM (1/4)
QT-CD121H
62
51
37
46
56
39
55
38
54
33
53
32
11
8
4
2
4
2
21
25
20
38
34
35
36
2
31
31
~
+5V
FOCUS COIL
TRACKING COIL
PICKUP UNIT
3
10
19
23
25
1
2
17
11
18
12
49
50
52
53
51
54
Q804
+5V
23
6
63
43
64
10
44
12
45
9
14
13
43
16
44
17
18
19
20
15
32
40
1
61
58
57
CL, DAT, SELIAL CONTROL
CONSTANT
VOLTAGE
REGULATOR
16
27
31
28
15
30
29
M
M
MOTOR
SLIDE
MOTOR
SPIN
1
2
3
4
9
~
~
17
14
14
XIN
XOUT
K1
CD
OPERATION
KEY
SW771~SW774
RC IN
LID
SW761
OPEN/CLOSE
SENSOR
REMOTE
RX771
~
~
57
24
27
28
31
60
41
44
30
33
22
23
37
CD LCD
LCD701
PICKUP IN
PU-IN SW
19
13
14
SL+
SL–
+7.4V
(CD)
1
2
3
4
5
6
7
GND (A)
R-CH
L-CH
GND (D)
POWER GND
+7.4V (D)
SECTION
MAIN
TO
VVDD
XIN
XOUT
VDD
XVDD
EFMO
EFMIN
CLV+
CLV–
V/P
HFL
TES
TOFF
JP–
JP+
TGL
RES. CQCK. COIN
SQOUT. RWC. WRQ
LCHO
LC78622E
IC802
SERVO/SIGNAL
CONTROL
16.93MHz
XL801
SLI
SLC
CV+
JP–
DRF
CE
DAT
CL
CLK
THLD/DEF
CE
DAT
CL
CLK
THLD/DEF
SLD
SLEO
SPO
FD
TO
TO
SL+
SL–
F
E
FIN1
FIN2
64
62
+5V
Q805
VCC1
LDO
LASER
DRIVER
SERVO AMP.
LA9240M
IC801
22
2
+7.4V
7
5
6
8
28
26
13
27
IC804
BA5914FP
FOCUS/TRACKING
/SPIN/SLIDE
DRIVER
M701
M702
SW702
RES
SL–
DRF
WRQ
RESET
VLC3
VDD
+5V
(D)
4MHz
X701
IC701
IX0105AW
SYSTEM
MICROCOMPUTER
COM0
SEG1
SEG4
COM3
CD LID
MUTE
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