Sharp CDBA-1200-H Service manual
http://servis-manual.com/
CD-BA1200H
(L3) x2
(L2) x2
(L3) x2
CD Servo
PWB
Slide Chassis
(L1)x1
ø3x8mm
(J2) x1
Clamp Lever
Turntable
CD Player Unit
(Top View)
(E2)x1
(E3)x1
(E2)x1
(E1)x7
ø3x10mm
Figure 10-1
Main PWB
(E2)x2
(F1)x3
ø3x8mm
Cam Gear Rib
Headphones
PWB
(E4)x1
(E1)x1
ø3x10mm
(J1) x2
1
Disc Tray
CD Player Unit
Figure 10-4
(K1) x3
2
(K1) x3
(G1)x9
ø3x10mm
(H1)x5
ø3x10mm
Tape
Mechanism
Figure 10-2
(G2)x1
Figure 10-3
Figure 10-5
Display PWB
Open
Cassette
Holder
Figure 10-6
– 10 –
Cam Gear
CD-BA1200H
CD
Mechanism
(M1) x1
Figure 11-1
CP-BA1200H
STEP REMOVAL
1 Speaker 1. Net ..........................(A1) x1 11-2
2. Duct Panel .............. (A2) x1
3. Screw......................(A3) x4 11-3
(M2) x3
(M1) x1
PROCEDURE
Loading
Motor
PWB
(N1) x5
FIGURE
CP-BA1200H
(A1)x1
(A2)x1
Driver
Speaker Box
Speaker Box
Speaker
(A3)x4
ø3.5x13mm
Driver should be
pried away from
Speaker Box.
Direction of handle
Figure 11-2
Figure 11-3
– 11 –
CD-BA1200H
REMOVING AND REINSTALLING THE MAIN PARTS
TAPE MECHANISM SECTION
Perform steps 1 to 6 and 8 of the disassembly method to
remove the tape mechanism.
How to remove the record/playback and erase
heads (TAPE 2) (See Fig. 12-1)
1. Carefully remove the record/playback head and erase head
screw (A1) x 2 pcs.
How to remove the playback head (TAPE 1)
(See Fig. 12-2)
1. Carefully remove the playback head screw (B1) x 2 pcs.
How to remove the pinch roller (TAPE 1/2)
(See Fig. 12-3)
1. Carefully bend the pinch roller pawl in the direction of the
arrow <A>, and remove the pinch roller (C1) x1 pc., in the
direction of the arrow <B>.
Note:
When installing the pinch roller, pay attention to the spring
mounting position.
Erase Head
(A1)x2
Ø2 x 9mm
Figure 12-1
TAPE 2
TAPE 1
Playback
Head
Record/Playback
Head
How to remove the belt (TAPE 2) (See Fig. 12-4)
1. Remove the main belt (D1) x 1 pc., from the motor side.
2. Remove the FF/REW belt (D2) x 1 pc.
How to remove the belt (TAPE 1) (See Fig. 12-4)
1. Remove the main belt (E1) x 1 pc., from the motor side.
2. Remove the FF/REW belt (E2) x 1 pc.
How to remove the motor (See Fig. 12-5)
1. Remove the screws (F1) x 2 pcs., to remove the motor.
Motor
TAPE 2
(B1)x1
Ø2x9mm
Pinch Roller
(C1)x1
FF/REW
Belt
(D2)x1
Figure 12-2
Pull
Figure 12-3
(B1)x1
Ø2x5mm
<B>
Motor
Pull
TAPE2
Main Belt
(D1)x1
<A>
Pinch
Roller
Pawl
Motor
TAPE1
Main Belt
(E1)x1
(F1) x2
Ø 2.6 x 5mm
– 12 –
(D1)x1
(E1)x1
Figure 12-4Figure 12-5
TAPE 1
FF/REW
Belt
(E2)x1
CD MECHANISM SECTION
TAPE MECHANISM
Motor
Variable Resistor
in motor
Perform steps 1, 2, 3, 9 and 12 of the disassembly method to
remove the CD mechanism.
CD-BA1200H
How to remove the loading motor
(See Fig. 13-1)
1. Bend the hooks (A1) x 5 pcs., to remove the loading motor.
How to remove the pickup (See Fig. 13-2)
1. Remove the screws (B1) x 2 pcs., to remove the shaft (B2).
2. Remove the stop washer (B3) x 1 pc., to remove the gear
(B4).
3. Remove the pickup.
Note
After removing the connector for the optical pickup from the
connector, wrap the conductive aluminium foil around the
front end of connector to protect the optical pickup from
electrostatic damage.
(B1) x2
ø2.6 x6mm
Loading Motor
(A1)x1
(A1)x2
(A1)x2
Slide Chassis
Figure 13-1
Stop Washer
(B3) x1
ADJUSTMENT
MECHANISM SECTION
• Driving Force Check
Torque Meter
Play: TW-2111 Tape 1: Over 80 g
• Torque Check
Torque Meter
Tape 1
Play: TW-2111 30 to 80 g.cm 30 to 80 g.cm
Fast forward: TW-2231 — 70 to 180 g.cm
Rewind: TW-2231 — 70 to 180 g.cm
Specified Value
Tape 2: Over 80 g
Specified Value
Tape 2
Pickup
Shaft
(B2) x1
Gear
CD Mechanism
(B4) x1
Figure 13-2
• Tape Speed
Test Tape
Normal MTT-111 Variable 3,000 ± Speaker
speed Resistor in 30 Hz terminal
Adjusting
Point
motor. (Load
Specified
Value
Instrument
Connection
resistance:
6 ohms)
Figure 13-3
– 13 –
CD-BA1200H
TUNER SECTION
fL: Low-range frequency
fH: High-range frequency
• AM IF/RF
Signal generator: 400 Hz, 30%, AM modulated
Test Stage Frequency
AM IF 450 kHz 1,620 kHz T351 *1
AM Band — 522 kHz (fL): T306 *2
Coverage 1.1 ± 0.1 V
AM Tracking 990 kHz 990 kHz (fL): T303 *1
*1. Input: Antenna Output: TP302
*2. Input: Antenna Output: TP301
Frequency
Display
Setting/
Adjusting
Parts
TP301
R381
Instrument
Connection
SO301
FM ANTENNA
TERMINAL
1
FE301
T351
• FM
Notes:
1: Description of the "FM IF Adjustment" is not carried on this
Manual. It is because the IF coil in the FM front end section
has been best adjusted in the factory so that its further
adjustment is not needed at the field. When replacing the
FM front end assembly, no adjustment is needed either.
2: The parts in the FM front end section are prepared in a
complete unit, so you can't obtain each part individually
CNP302
AM LOOP
ANTENNA
T303
T306
MAIN PWB
AM
TRACKING fL
AM BAND
COVERAGE fL
AM IF
Figure 14-1 ADJUSTMENT POINTS
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
performed automatically. Therefore, playback of each disc
can be performed under optimum conditions.
Items adjusted automatically
(1) Offset adjustment (The offset voltage between the head
amplifier output and the VREF reference voltage is
compensated inside the IC.)
* Focus offset adjustment
* Tracking offset adjustment
(2) Tracking balance adjustment (waveform drawing Fig.
14-2 EFBL)
(3) Gain adjustment (The gain is compensated inside the IC
so that the loop gain at the gain crossover frequency will
be 0dB.)
* Focus gain adjustment
* Tracking gain adjustment
R357
TP302
CD ERROR CODE DESCRIPTION
Error State Code
0001 Cannot detect Pickup-in SW
0002 DSP access error
0101 Open/Close SW Low → High not functioning
0103 Open/Close SW High → Low not functioning
0201 Open/Close SW Low → High not functioning
0203 Open/Close SW High → Low not functioning
0302 Pickup-in SW is not detected
0306 During Disc 1 search, Open/Close SW or Clamp SW
0307 Clamp SW Low → High not functioning
0308 Clamp SW High → Low not functioning
[Servo System Error]
[Error during close operation]
[Error during open operation]
[Error during skip operation]
or Disc SW do not change to low.
T
T
1
3
Stopped
FDO
TE
CH1=500mV
DC 10:1
CH2=200mV
DC 10:1
CH3=1V
DC 10:1
1999/04/05 20:26:47
500ms/div
(500ms/div)
NORM:20kS/s
– 14 –
EFBL
2
Smoothing : ON CH1 : 0.000V
BW : FULL
CH2 : 0.000V
CH3 : 0.00V
CH4 : 0.00V
Figure 14-2
=Record Length=
Main : 100K
Zoom : 2k
CH2
v/DIV
200mV
=Trigger==Filter= =Offset=
Mode : SINGLE
Type : EDGE CH1
Delay : 0.0ns
Hold off : 0.2us
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.
• 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
• Schematic diagram and Wiring Side of P.W.Board for this
model are subject to change for improvement without prior
notice.
CD-BA1200H
• The indicated voltage in each section is the one measured
by Digital Multimeter between such a section and the chassis with no signal given.
1. In the tuner section,
( ) 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.
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
maintaining the safety of the set. Be sure to replace these
parts with specified ones for maintaining the safety and
performance of the set.
REF. NO DESCRIPTION POSITION POSITION
SW1 OPEN/CLOSE ON—OFF
SW2 CLAMP ON—OFF
SW3 DISC NUMBER ON—OFF
SW4 PICKUP IN ON—OFF
SW701 ON/STAND-BY ON—OFF
SW702 CLOCK ON—OFF
SW703 TIMER/SLEEP ON—OFF
SW709 DISC SKIP ON—OFF
SW710 OPEN/CLOSE ON—OFF
SW711 EQUALIZER/X-BASS/DEMO ON—OFF
SW712 VOLUME UP ON—OFF
SW713 VOLUME DOWN ON—OFF
REF. NO DESCRIPTION
SW714 CD ON—OFF
SW715 TAPE ON—OFF
SW716 TUNING /TIME DOWN ON—OFF
SW717 MEMORY/SET ON—OFF
SW718 REWIND ON—OFF
SW719 FAST FORWARD ON—OFF
SW720 PLAY/REPEAT ON—OFF
SW721 STOP ON— OFF
SW723 REC/PAUSE ON—OFF
SW724 TUNING/TIME UP ON—OFF
SW725 TUNER (BAND) ON—OFF
FRONT
VIEW
FRONT
FRONT
VIEW
VIEW
E C B
(S) (G) (D)
(1) (2) (3)
BCE
2SC1845 F
2SC3331
2SC380 O
KTA1266 GR
KTA1271 Y
KTA1273 Y
KTC3203 Y
KRC102 M
KRC104 M
KRC107 M
KTC2026
4204SRT7
Figure 15 TYPES OF TRANSISTOR AND LED
– 15 –
CD-BA1200H
5
1
3
4
4
3
1
1
2
IC2 24
IC2 23
IC2 24
IC2 72
IC1 18 ,
IC2 16
IC1 27
IC1 18 ,
IC2 16
IC2 72
IC2 24
Stopped
CH1=500mV
DC 10:1
T
FDO
1
TDO
3
Smoothing : ON CH1 : 0.000V
BW : FULL
1
T
2
3
Smoothing : ON CH1 : 0.000V
BW : FULL
2
T
1
Smoothing : ON CH1 : 0.0V
BW : FULL
T
2
CH2 : 0.0V
CH3 : 0.000V
CH4 : 0.00V
Stopped
CH1=500mV
DC 10:1
FDO
DRF
TE
CH Position To
-3div -1div 0div +1div +3div
CH2 : 0.0V
CH3 : 0.00V
CH4 : 0.00V
Stopped
CH1=10V
DC 10:1
TE
DRF
=Filter= =Offset=
CH2 : 0.00V
CH3 : 0.00V
CH4 : 0.00V
Stopped
CH1=200mV
DC 10:1
FDO
CH2=10V
DC 10:1
T
CH2=1V
DC 10:1
T
CH2=500mV
DC 10:1
CH3=500mV
DC 10:1
=Record Length=
Main : 100K
Zoom : 2K
CH3=1V
DC 10:1
=Record Length=
Main : 100K
Zoom : 2K
=Record Length=
Main : 100K
Zoom : 2K
WAVEFORMS OF CD CIRCUIT
500ms/div
(500ms/div)
NORM:20kS/s
IC2 1
7
IC2 2
8
IC2 24
10
11
12
1
9
1
4
13
IC2 37
IC2 57
IC2 58
IC2 59
IC2 24
IC1 18 ,
IC2 16
IC1 13 ,
IC2 22
CH1
v/DIV
500mV
=Trigger==Filter= =Offset=
Mode : AUTO
Type : EDGE CH1
Delay : 0.0ns
Hold off : 0.2us
500ms/div
(500ms/div)
NORM:20kS/s
CH2
Position
0.20div
=Trigger==Filter= =Offset=
Mode : AUTO
Type : EDGE CH1
Delay : 0.0ns
Hold off : 0.2us
Vp-p=1.0V~1.3V
0.5mV/div,0.5µsec/div
100ms/div
(100ms/div)
NORM:100kS/s
=Trigger=
Mode : NORMAL
Type : EDGE CH1
Delay : 2.924ms
Hold off : 0.2us
1999/04/07 09:51:15
500ms/div
(500ms/div)
NORM:20kS/s
Stopped
PDO1
3
4
PDO2
T
FDO
1
Smoothing : ON CH1 : 0.000V
BW : FULL
Stopped
T
1
DOUT
Smoothing : ON CH1 : 0.00V
BW : FULL
Stopped
1
LRSY
2
DATACK
T
3
DATA
Smoothing : ON CH1 : 0.00V
BW : FULL
Stopped
T
FDO
1
TE
3
EFBL
2
Smoothing : ON CH1 : 0.000V
BW : FULL
CH1=500mV
DC 10:1
CH1=2V
DC 10:1
CH1=2V
DC 10:1
CH1=500mV
DC 10:1
CH2 : 0.0V
CH3 : 0.00V
CH4 : 0.00V
T
CH2 : 0.00V
CH3 : 0.00V
CH4 : 0.00V
T
CH2=2V
DC 10:1
CH2 : 0.00V
CH3 : 0.00V
CH4 : 0.00V
T
CH2=200mV
DC 10:1
CH2 : 0.000V
CH3 : 0.00V
CH4 : 0.00V
CH3=1V
DC 10:1
=Record Length=
Main : 100K
Zoom : 2K
=Record Length=
Main : 1K
Zoom : 100
CH3=2V
DC 10:1
=Record Length=
Main : 5K
Zoom : 100
CH3=1V
DC 10:1
=Record Length=
Main : 100K
Zoom : 2k
1999/04/05 17:33:17
CH4=1V
500ms/div
(500ms/div)
DC 10:1
NORM:20kS/s
=Trigger==Filter= =Offset=
Mode : AUTO
Type : EDGE CH2
Delay : 0.0ns
Hold off : 0.2us
1999/04/07 09:25:28
500ns/div
(500ns/div)
NORM:200MS/s
=Trigger==Filter= =Offset=
Mode : NORMAL
Type : EDGE CH1
Delay : 2.887ms
Hold off : 0.2us
1999/04/05 20:50:17
NORM:100kS/s
=Trigger==Filter= =Offset=
Mode : AUTO
Type : EDGE CH3
Delay : 0.0ns
Hold off : 0.2us
1999/04/05 20:26:47
500ms/div
(500ms/div)
NORM:20kS/s
=Trigger==Filter= =Offset=
Mode : SINGLE
Type : EDGE CH1
Delay : 0.0ns
Hold off : 0.2us
5us/div
(5us/div)
CH1
v/DIV
500mV
CH3
v/DIV
2 V
CH2
v/DIV
200mV
SPDO
IC2 25
6
1
=Filter= =Offset=
Smoothing : ON CH1 : 0.000V
BW : FULL
CH2 : 0.000V
CH3 : 0.00V
CH4 : 0.00V
=Record Length=
Main : 100K
Zoom : 2K
=Trigger=
Mode : NORMAL
Type : EDGE CH2
Delay : 2.924ms
Hold off : 0.2us
– 16 –
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