Sharp CD-C500Z User manual

SHARP SERVICE MANUAL
DIGITAL AUDIO
001
DOLBY SYSTEM
l Dolby noise reduction manufactured under license from Dolby
Laboratories Licensing Corporation.
“DOLBY” and the double-D symbol 00 are trademarks of
Dolby Laboratories Licensing Corporation.
l In the interests of user-safety the set should be restored to its original
condition and only parts identical to those specified be used.
1% i
/
INDEX TO CONTENTS
Page
SPECIFICATIONS .........................................................
.2
NAMESOFPARTS ......................................................3-6
VOLTAGE SEl.&CTION
OPERATION MANUAL
....................................................
.6
DISASSEMBLY.. ............................................................................ . . . . . . . . . . .
::‘,:-: 2”
REMOVING AND REINSTALLING THE MAIN PARTS
........................
13115
CHANGER MECHANISM OPERATION
.....................................
16,17
ADJUSTMENT .......................................................
18-21
TROUBLESHOOTING(CD SECTION)
.....................................22-26
FUNCTION TABLE OF IC / BLOCK DIAGRAM OF IC
..........................27-33
BLOCKDIAGRAM .....................................................34-36
SCHEMATIC DIAGRAM/WIRING SIDE OF P.W.BOARD .....................37-57
NOTES ON SCHEMATIC DIAGRAM
..........................................58
TYPES OF TRANSISTOR AND LED
..........................................59
AC POWER SUPPLY CORD AND AC PLUG ADAPTOR
.........................
.59
EXPLODED VIEW.. ....................................................60-6 6
REPLACEMENT PARTS LIST
...........................................67-80
SHARP CORPORATION

FOR A COMPLETE DESCRIPTION OF THE OPERATION OF THIS UNIT, PLEASE
REFER TO THE OPERATION MANUAL.
SPECIFICATIONS
B Compact disc stereo music system
0 General
Power source: AC 110 V/l 27 Vi220 VI
230-240 V, 50160 Hz
Power consumption:
160 W
Dimensions:
Width; 270 mm (lo-5/8”)
Height; 316 mm (12-7/16”)
Weight:
Depth; 300 mm (11-13116”)
7.8 kg (17.2 Ibs.}
0 Amplifier section
Peak music power
output:
Music power output:
Continuous power
output:
input sensitivity and
input impedance:
Load impedance:
l Tuner section
Frequency range:
320 W
2 x 40 W, 10 % T.H.D.
2 x 21 W, 10 % T.H.D.
AUWVIDEO; 500 mV/47 kohms
Mixing microphone; 1 mV/
1 kohms
Speakers; 6 ohms
(Main speaker; 16 ohms)
(Super woofer; 8 ohms)
Headphones; 16 - 50 ohms
(recommended; 32 ohms)
FM; 88.0 - 108 MHz
SWZ; 9.5 - 21.85 MHz
SWl; 3.2 - 7.3 MHz
MW; 531 - 1,602 kHz
(9 kHz span)
MW; 530 - 1,620 kHz
(10 kHz span),
0 Compact disc player section
Type: 6-disc magazine type compact
disc player
Non-contact, 3-beam semi-
conductor laser pickup
200 - 500 rpm CLV, Approx.
CIRC (Cross Interleave Reed-
Solomon Code)
4-times oversampling digital filter
and active filter
20 - 20,000 Hz
95 dB (1 kHz)
90 cl6 (1 kHz)
Unmeasurable
(less than 0.001% W. peak)
Signal readout:
Rota&al speed:
Error correction:
Filter:
Frequency response:
Signal/noise ratio:
Dynamic range:
Wow and flutter:
0 Cassette deck section
Tape: .
“‘*” ..),A
‘- :?>
Compact cassette tape
Frequency reyy.=
50 - 14,000 Hz (Normal tape)
‘, .L<&
50 - 15,000 Hz (00~ tape)
S/N ratio:
:- .,y:,
”
:4- .i*.
Dolby NR off; 50 dB
_j .I “’
.,, ‘“:<-
Dolby NR effect; 10 dB
.: ;,a**
Wow and flutter:
(at over 5 kHz)
“;OXG’%,(WRMS)
n Speaker system
Speakers:
Rated power:
Maximum power
handling capacity:
Impedance:
Dimensions:
Weight:
.
2-way 12 cm (4-3/4”) woofer and
5 c-m* (2”) tweeter fype
.- . .
. .
10 w
20 w
16 ohms
Width; 158 mm (6-l/4”)
Height; 316 mm (12-7116”)
Depth; 256 mm (lo”)
2.9 kg (6.4 Ibs.) /each
n Super woofer System
Speakers:
Rated power:
lOcm(4”)x2
21 w
Maximum power
handling capacity: 40 w
Impedance:
8 ohms
Dimensions:
Width; 158 mm (6-l/4”)
Height; 316 mm (12-7/16”)
Weight:
Depth: 256?-nm (10”)
3.7 kg (8.2 tbs.)
Specifications for this model are subject to change without prior
notice.
-2-

NAMES OF PARTS
///
3 45
+
6 7
8
14 15 16 17
19 20
21
22 23
24 25 26
27
$1 32 33
n Tuner control section
1. Band indicators
2. Station Frequency
3. Preset Channel Indicator
4. FM Stereo Indicator: cc
5. FM Stereo Mode Indicator
6. Auto Scan indicator
7. Memory Indicator
8. Preset Channel Up/Down Buttons
9. Band Selector Button
10. FM Mode Button
11. Auto Scan/Manual Tuning Selector Button
12. Tuning Up/Down Buttons
13. Memory Button
n CD control section
14. Pause Indicator: II
15. Play indicator: )
16. Disc Number Indicators
17. Track Number Indicator
18. Minutes and Seconds
IndicatoriProgramme Number Indicator
19. Repeat Indicator: c
20. Music Schedule Over Indicator
21. Music Schedule Indicators
22. Programme Indicator
23. Random Play Indicator
24. Disc Number Select Buttons
25. Magazine Compartment
26. Pause Button: II
27. Play Button: )
28. Track Up/Down Buttons: W I W
29. Eject Button: r
30. Stop Button: n
31, Mixing Microphone Socket
32. Mixing Microphone Level Control
33. CD Magazine
-3-

1 2
345 6
7 8 9 IO
Ii
12 13
14 15 16
jTAPE2 j
1
n
I I
II
R
17 18 19 20 21
22 23
24 25 26
TAPE 2
/ TAPE 1
I
n Amplifier section
1. Power Switch
2. Graphic Equalizer Controls (LEFT)
3. Remote Control Sensor
4. Extra Bass Indicator: X-BASS
5. TAPE 1) Direction Indicators
6. Graphic Equalizer Controls (RIGHT)
7. Dolby NR Switch
8. Tape Selector Switch
9. Dubbing Speed Switch
10. Power On/Stand-By Indicator
Il. Function Selector Buttons and Indicators
12. Balance Control
13. Volume Control
n Tape control section
14. TAPE 2) Cassette Co&artment
15. Headphones Socket
16. TAPE 1) Cassette Compartment
17.
Record Button:
0
18. Play Button: b
19. Rewind Button: U
20. Fast Forward Button: H
21. StoplEject Button: n /r
22. Pause Button: II
23.
Reverse Mode Switch: c;i
I 3
24.
Play Button: 4,
25.
Fast Wind Buttons: M 1
H
26. Stop/Eject Button: n ,&
27.
Direction Switch: 41,
-4-

4
5
6
8 9
-5-
-6-
n Rear pane1
‘. MWlSWllSW2 Asrlal Terminal
2. MW/SWl/SWP Aerial Earth Terminal
3. FM Aerial Terminals
4. Auxiliary I Video (Audio Signal) Input
Sockets
5. Span Selector Switch
6. Beat Cancel Switch
7. AC vduge Sslsctor
6. AC Supply Lead
9. Speaker Terminals
I14
- 15
- 16
- 17
- 18
- 19
- 20
60”
n Names of controls
1. Remote Control Transmitter Window
2. Extra Sass Button : X-SASS
3. Power Button
4. Function Selector Buttons
5. Volume Up/Down Buttons
S Tuner control buttons
6. Band Selector Buttons
7. Preset Channel Up/Down Buttons
l CD control buttons
6. stop Sutton: .
9. Disc Skip Button
10. Cue Sutton: H
11. Review Sutton: 44
12. Disc Number Select Buttons
13. Track Number Select Buttons
14. Pauss Button: I,
15. Play Button: t
16. Track Up/Down Buttons: I+ , m
17. Repeat Sutton: c
16. Random Play Sutton
19. Memory Button
20. Clear Button
q Proper use of the remote control
Aim the remote control at the remote control sensor with,”
60” with no obstacles, and operate as shown.
Notes concsrnlng uss:
0 Replace the batteries if control distance decreases or
operation becomes erratic.
l Periodically clean the transmitter wlndow on the rsrnote
control and the sensor on the main unit with a soft cloth.
0 Exposing the sensor on the main unit to strong light can
interfere with ooeration.Chanoe the lighting or the dlrec.
tion of the unit:
0 Keep the remote control away from moisture, excessive
heat. shock, and wbratlons.
0 The remote control’8 usable range IS between 0.2 m (6”)
and 6 m (20’) away from the sensor.
VOLTAGE SELECTION
The voltage selector IS located on the rear of the unit. If ad-
]ustment is necessary, use a screwdriver I” order to turn the
selector m either direction until the correct voltage figure IS
displayed m the window next to the adjustment screw.

m
3
1
2
n APSS (Auto Program Search System)
5
1
23
-
n APMS (Automatic Programmable Music
Selector)

P!AY
REPEPlT
1

DISASSEMBLY
Caution on Disassembly
Follow the below-mentioned notes when disassembling the
unit and reassembling it, to keep its safety and excellent
performance:
1. Take cassette tape and CD magazine out of the unit.
2. Be sure to remove the power supply plug from the wall
outlet before starting to disassemble the unit.
3. Take off nylon bands or wire holders where they need be
removed when disassembling the unit. After servicing the
unit, be sure to rearrange the leads where they were before
disassembling.
4. Takesufficientcareonstaticelectricityoftntegratedcircuits
and other circuits when servicing.
Figure 12-1
msp,ay PWS
Figure 12-2
4 /
Back Board
1.screw ...........(Dl)X 5 11-Z
5
CD Block 1.screw
........
..(El) x 411-3
2. Socket ........
.(EP)x 3
Figure 1 l-l
Figure 12-3
Figure 12-4
Figure 11-2
‘l!Y
Figure 12-5
,A21X2
a3xl2mm Figure 12-6
Figure 11-3
Figure 12-7 *
Figure 12-8
- 11 -
- 12-

REMOVING AND REINSTALLING THE MAIN PARTS
TAPE MECHANISM SECTION
Perform steps 1, 2, 3. 4, 5, 6, and 7 of the disassembly method
to remove the tape mechanism.
How to remove the main, FF/rewind belt (See
Fig. 13-1.)
1. Remove the Mann belt, (Al) x 1 PC., at the tape 2 side from
the motor pulley.
2. Remove the main belt, (A2) x1 pc.,at the tape 1 side from the
motor pulley.
3. Remove the FF/Rewlnd belt, (A3) x 1 PC., from the tlywheel
of tape 2.
4. Put on the belts in the reverse order of removal.
Note:
1. When putiing on the belt, ascertain that the belt is not busted,
and clean It.
How to remove the T2 motor (See Fig. 13-2.)
1. Remove the screw, (El) x1 PC., and remove the motor fixture.
2. Remove the screws, (82) x2 PCS., and remove the motor.
How to remove the Tl motor (See Fig. 13-2.)
1. Remove the screws, (83) x2 pcs.,and remove the motor
fc&re
2. Remove the screws, (84) x3 pcs.,and remove the motor.
Note:
1. When mounting the motor, pay attention to the motor bracket.
2. When the motor is removedShe belt comes off Put it on,
referrlng to the description of belt putting-on.
How to remove the flywheel of tape 1 side (See
Fig. 13-3.)
1. Remove the drive belt.
2. Remove the washers, (Cl),(C3) and the stop wasper, (C2)
with a small precision screwdriver to extract the flywheel from
the chassis.
How to remove the flywheel of tape 2 side. (See
Fig. 1’3-2 and 13-3.)
1. Remove the drive belt.
2. Remove the screws, (83) x2 PCS., and remove the motor
fixture.
3. Remove the stop washer, (C4) with a small precision screw-
driver to extract the flywheel from the chassis.
Note:
1. When the stop washer IS deformed or damaged, replace it
with a new one.
Figure 13-l
Figure 13-2
How to remove the pinch roller of tape 1 side
(See Fig.l4-1.)
1. Remove the stop washer, (Dl) with a small precision
screwdriver, and remove the pinch roller.
How to remove the pinch roller of tape 2 side
(See Fig. 14-l.)
1. Carefully release the pinch roller hook in the directIon
indicated by the arrow mark, and remove the pinch roller.
How to remove the playback head (See Fig.
14-2.)
1. Remove the screws, (El) x2 PCS., and remove the button
block.
2. Remove the screws, (EZ),(E3), and remove the head.
How to remove the record/playback and
erase heads (See Fig. 14-2)
1. Remove the screws,(E4).(E5),and remove the
record/playback head.
2. Removethescrews, (E6)xZpcqandremovetheerase head.
Be sure to apply screw lock after replacement of head and
azimuth adjustment.
Figure 14-1
Figure 14-2
Figure 13-3
- 13
- 14-

CD MECHANISM SECTION
Perform steps 1,2, 3,4,5 and 10 of the disassembly method to
remove the CD mechanism.
Replacement of pickup (See Figs. 15-1 and
15-2.)
When replacingthe pickup, refer to “Cares when Handling Plckup
Assembly”.
(a) After removing the CD mechamsm according to the
disassembling procedure, remove the screws, shafts and
connectors in order of 0, 0, 0, and @, and replace the
pickup.
(b) Fit a new pickup in reverse order of disassembling. After
fittmg, lock it with the screw 0.
(c)
Connect the connector and lead wire as it was.
(d) The laser power adjustment is not necessary owing to
improvement of performance of pickup.
Note:
When replacing the pickup do not apply force to the turntable of
spin motor. Otherwise, the height of main chass% and turntable
may be varied.
After replacing the pickup
This new mechanism has been newly designed to enhance
remarkably its performance as compared to the former ones, so
that there is no need to adjust pickup posture.
’ After mounting the pickup. apply voltage to the slide motor, and
ascertain that it runs at DC 1.5V or less.
CD CHANGER MECHANISM SECTION
Removing the CD changer motor (See Figs.
15-3 and 15-4.)
1. Before remowng the motor mounting chassis, turn the load
gear and lift gear in the direction of the arrow as far as it will
go.
2. Remove the 3 chassis screws (Al) which hold the loading
motor and lift motor.
3. Removethe other 2 screws (A2) which hold the loading motor,
and remove it.
4. Remove the last 2 screws (A3) which hold the lift motor, and
remove it.
How to remove a CD magazine when it cannot
be ejected (See Fig. 15-3.)
1. If the CD magazine is locked and cannot be ejected due to
trouble, Remove the cabinet, and turn the load gear
counterclockwise manually to eject the CD magazine. (See
Fig 15-3.)
Figure 15-1
Rock Gear
Figure 15-2
Figure 15-3
CA21
$js2.6x3mm imld Molar
I
CHANGER MECHANISM OPERATION
This changer mechamsm consists of 6 changers. Magazines are
m%xted by hand, and microcomputer operabon is not
performed.
DISC tray unloading, disc chuckmg, disc tray storage, magazine
discharge and disc tray selection are performed by the
microcomputer.
1. For microcomputer operation, see the IC function table.
2. For the timing charts, see Figs. 16,17-i and 17-2 shown
below.
Figure154
- 15-
Figure 16
- 16-

Time Chart(StoP To PlaY 4th DISC To StoPI
stop
p;;::e
Magazine ’
Lift Motor Down
Loadlnh ’
(1st DISO)
(sqttonra~,esc) (4th To 1st DISC) 1st DISC)
yfl~lne LOCK ___________.________-----.--------.----.--- ___ __ __--__--__---__-----____________________----------- -__-_-----_
Play
hlOadln6
Loading StoP UnloadIns
4th DISC
LoadIns
Figure 17-l
Time Chart(Llft Motor UP / Down)
DISC I (SWSM)
Photo-Jnterruptsr
LoadIns h0TOR
(Close) +
~7;la ,tv0TOR3
40mS
UnloadIns
ComPlsta
Lift Motor
Down Complete
LoadlnG
Complete UnloadInS
ComPiete
Lift Motor
UP ComPlete Loading ComPiste
Figure 17-2
- 17-

ADJUSTMENT
As for preparation for adjustment, adjusting method and re-
placement of pickup refer to the relevant explanation in Service
Manual “ADJUSTMENT PROCEDURES OF AUDIO PRO-
MECHANISM SECTION
l Driving Force Check
Torque Meter Specified Value
Tape 1
Play: TW-2412 Over 50 g
Tape 2 ’
Over 60 g
Reverse Play: TW-2422 Over 50 g Over 60 g
l Torque Check
Torque Meter
Specified Value
Tape 1 Tape 2
Play: TW-2111 27 to 60 gem
27 to 60 g.cm
Reverse Play: TW-2121 27 to 60 gem
27 to 60 g.cm
Fast Forward: TW-2231 55 to 120 gem 55 to 120 g.cm
Rewind: TW-2231
55 to 120 g.cm 55 to 120 gem
l Head Azimuth
Test Tape Instrument Connection
MTT-114
Headphones socket
(Load resistance: 32 ohms)
l Tape Speed
Test Tape Adjusting Specified Instrument i
Point Value Connection
High Ml-T-1 11 Tape1 : 6,000 i
Speaker
speed*
VR404 100 Hz
terminal (Load
Tape2: resistance: 6 j
VR402 ohms)
Normal
MTT-111 Tape1 : 3,000 +
speed VR401
i 60 Hz
i Tape2: 1
VR403
*Short TP402 @and TP402 0 when performing the high speed
adjustment.
TAPE SECTION
!
L
Position of each switch or control
Volume Max
Graphic Equalizer Center
Function Tape
Dolby NR Off
Beat cancel
A
Tape selector Normal
Dubbing speed Normal
l Bias Frequency
Adjusting
Specified Value Instrument
Point !
Connection
L411
100 kHz
Q421 Emitter /
(BEAT CANCEL Switch : A)
l Bias Current
1 Adjusting Point Specified Value Instrument
’
Connection
L: VR407 Normal: 20 i 3 V L: Pin 1 of
CNP404*
R: VR408 PI: Pin 5 of GNP404
l Erase Current Check
Resistor for measurement:
1ohm
Specified Value
30i7mV
l Playback Amplifier Sensitivity
r Tast Tape Adjusting Specified
Point Value Instrument Connection
1
t
MT-T-1 50
L: VR405
1 R: VP,406
Normal: L: Pin3 of TP401
560 mV R: Pin1 of TP401
l Record /Playback Sensitivity (Tape 2)
Test Tape: UR-121
Input Level Adjusting Specified Instrument Connection
Point Value
l 1
L: VR409 Ret Level: Input: AuxAIideo
R: VR410 103 mV Output:TP401
* 1: Adjust the oscillator so that TP401 output is 103 mV in the
recording mode.
l Playback Amplifier Sensitivity Check
Test Tape 1 Specified Instrument
Value
Connection
2.7 V + 3dB Speaker terminal
(Load resistance:6 ohms)
Figure 18 ADJUSTMENT POINTS
- 18-

c
TUNER SECTION
fL: Low-range frequency
fH: High-range frequency
l AM IF/RF
Signal generator: 400 Hz, 30%, AM modulated
Span Selector Switch: 9kHz
Test Stage Frequency Frequency Specified
Instrumc
Display Value/
Connecti
Adjusting
Point
IF
450 kHz
1,602 kHz T209 l 1
MW band -
531 kHz T207(fL):
l 2
coverage 1.1
vrt
0.05 v
MW
603 kHz
603 kHz T203(fL)
‘1
tracking 1,404
kHz
1,404 kHz
TC203(fH)
SW1 band
3.2 MHz 3.2 MHz
T206(fL): *3
coverage 2.1
v+
0.05 v
7.3 MHz 7.3 MHz
TC206(fH):
7.7 Vk
0.05 v
SW1
tracking
3.9 MHz 3.9 MHz
T202(fL) ‘I
7.1 MHz 7.1 MHz
TC202(fH)
SW2 band
coverage
I::,:.,,*;
ent
on
0.05 v
SW2
11.65 MHz 11.65 MHz
T201 (fL)
*l
tracking
21.45 MHz 21.45 MHz TC20l(fM)
*1. input: Antenna
*2. Input: Antenna
Output: Pin 15 of IC202 Output: Collector of Q216
*3. input: Antenna
Output: Collector of 0214
~.
i
l FM IF/RF
Signal generator: 1 kHz, 40 kHz dev., FM modulated
Test Stage Frequency Frequency Setting/ Instrument
Display
Adjusting Connection
Point
Band -
67.5 MHz
1324 (fL):
l l
coverage
1 .a5 v i
50 mV
RF
98.00 MHz 98.00 MHz T321 ST322 l 2
(1 O-30 dB)
IF
98.00 MHz 98.00 MHz -
*2
(1 O-30 dB)
*l .Input:Antenna
0utput:Collector of Q216
*2Jnput:Antenna
0utput:Pin 12 of IC202
l FM Detection/Distortion
Signal generator: 1 kHz, 40 kHz dev, FM modulated
l FM Auto Stop Level
Signal generator: 1 kHz, 40 kHz dev, FM modulated
Frequency Frequency Adjusting Instrument Connection
Display Point
98.00 MHz 98.00 MHz VFi202*
) (30 dB)
Input: Antenna
Obtput: Speaker terminal
* Adjust so that an output signal appears.
l VCO Frequency
*Adjust for 38 kHz i 100 Hz.
u
-.
T210
I
-
VR202
R271
A?-,“;
Figure 19 ADJUSTMENT POINTS
- 19-

CD SECTION
1. Preparation for Adjustment
When adjusting, be sure to refer to Service Manual
“ADJUSTMENT PROCEDURES OF AUDIO PRODUCTS”.
l Test mode of control microcomputer
Depressing the FF button and REW button, turn on the power
switch.
2. VCO Free-Run Frequency
Adjusting Specified
Value
Point
VR6
4.320 MHz I 15 kHz
Instrument Connection
Pin 9 of ICl and GND.
3. Servo Unit
The procedure of adjustment differs from that stated in Service
Manual“ADJUSTMENT PROCEDURES OF AUDIO
PRODUCTS”.
Follow the procedure stated below.
l Focus Offset
Adjusting Specified Value Instrument Connection
Point
VR3 Oi50mV Pin 2 and pin 1 (GND) of
CNP2.
l Tracking Off set
Adjusting Specified Value
Point
VR2 Oi50mV
Instrument Connection
Pin 4 and pin 1 (GND) of
CNP2.
l Tracking Error Balance
Adjusting Adjusting Method Instrument Connection
Point
VR4
l 1
TPl (TGl) and GND.
*1 : Short-circuit the Pin 4 of IC4 and GND.
Adjust so as to obtain symmetric waveform (Figure 20-2)
when DC is 0 V.
l Focus Gain
* 2: Apply sine wave (Oscillation Frequency: 1 .O kHz 1 .O Vrms)
as shown in Figure 20-3.
l Tracking Gain
Adjusting Adjusting Method Instrument Connection
Point
VR5
Adjust so that the TPl (TGl)(TG2)
voltage of CH-1 is equal
and GND.
i
*
/ to that of CH-2. l 3
3: Apply sine wave (Oscillation Frequency: 1 .O kHz 1 .O Vrms)
as shown in Figure 21-I.
Check again the focus offset, tracking offset and tracking
error balance.
l Check HF output
1 Adjusting ( Adjusting Method 1
Instrument Connection
Point /
__ __
1 TPl (HF) and GND.
/
Make sure that waveform is as shown in Figure 21-2.
GNDo !
1
I
I -
I,
I
1
I
-------------I
;RACKING ERROR
BALANCE ADJ. JIG
DC=OL
I
-I
Figure 20-l TRACKING ERROR BALANCE
More than
1. ZVP-P
Figure 20-2 TRACKING ERROR BALANCE
IOOK
3. 3K
I
~~-~--~~~~-----~~~-J
FOUCUS GAIN ADJ. JIG
Figure 20-3 FOCUS GAIN
- 20 -

R79
220
r----q70-----------~
I
I
1
I
*..
100K
GENERATOR
I
I
470
i
--------------------~
TRACKING GAIN ADJ. JIG
i I I I I I
0%’ ” ’ + ’ 11 1
Figure 21-1 TRACKING GAIN Figure 21-2 HF OUTPUT
ICI
1
-.I
3
7
TGI
TG2
HF
FG2
FGI
GND
@PI
VRI
EEl @+@JjL
GE VR2
t
1. 65-2.
I
VP-P
25
IEF I
i I
Figure 21-3 ADJUSTMENT POINTS
-21 -

TROUBLESHOOTING (CD SECTION)
l Remove the cabinet and follow the troubleshooting
instructions.
Turn the power switch on the unit to ON.
j
* Check the item of “The disc is not up/down.”
Does the spin motor run?
-/ Check the item of “The spin motor does not run.”
Yes
No
*
When the disc is initialized, is TOC read?
Is TOC set to the playback mode?
1 Yes
No
9 Check the item of “The disc does not playback.”
Is there any audio
outpu
No
Check the audio circuit.
I
Turn the power switch to ON.
I
1
Check the power circuit voltage.
I
I i
1
’ i
Is the oscillating circuit (XL801) of the control
microcomputer (IC801) operating normally?
Yes
-- Check the XL801 and peripheral circuits and replace
No
faulty parts.
Check to see that the reset circuit of the control
microcomputer (IC801) is operating normally.
Normal
1 Defectivec Check the reset circuit (lC802) and peripheral circuits and ’
I
replace faulty parts.
I
Is the drive signal of the LCD or fluorescent character
/ The microcomputer (IC801) is defective. Replace it.
.
Yes
Check the supply voltage of the LCV1 Oefect,ve*&
I
, character display tube. The LCD or fluorescent character display tube is defective.
/
II
1 Normal
+
Are the connector and PWB pattern damaaed?
j Normal
I
- 22 -

Is the standby switch signal(L) being input to pin 50 of the
control microcomputer(lC801)?
T/ Replace the standby switch.
Is the loading end switch signal (H) being input to pin 49
of the control microcomputer (IC801)?
/
,
Noi Replace the loading end switch.
I
!
Yes
/ Is the motor drive output being output from pins 43 and 45
/of
7
The control microcomputer (IC801) is defective. Replace it.
Yes
Is the motor drive output being output from pins 3 and 10 Is there
+10.5V at pins 7 and 9 of IC6?
of the motor driver (IC6)?
No
~ ,
/
Yes
The loading motor (M3) is defective. Replace it.
The loading mechanism is faulty.
:
i
No
>
Check to see if the PWB pattefn to
the power supply is damaged.
control microcomputer (IC801)?
The disc 1 switch is defective. Replace it.
Is the photo-interrupter signal (H) being input to pin 47 of
p Replace the photo-interrupter.
the control microcomputer (IC801)?
No
Yes
Is the motor drive output being output from pins 43 and 45
of the control microcomputer (IC801)?
No* The control microcomputer (IC801) is defective. Replace it,
Yes
Is the motor drive output being output from pins 2 and 10 p Is there +10.5V at pins 7 and 9 of IC6?
of the motor driver (IC6)?
’ b
No
I
i
Yes
The lift motor (M4) is defective. Replace it.
The lift mechanism is faulty.
r
Check to see If the PWB pattern to
Check the output of pins 53 (DM+) and 54 (DM-)
of ICl.
( Normal
i
Check the output of pin 2 of IC5.
Normal
Defective
____* IC5 is defective. Replace it.
Spin motor M2 is defective. Replace it.
- 23 -

Is the disc initialized?
1
b/ Does the laser diode go on?
7
Yes
/
A Check the item of “The laser diode goes on.”
!
4 B Check the item of “The laser diode does not go on.”
1
Does the tracking servo operate normally?
Is the EFM signal of pin 36 of IC2 flat? (Lower side)
Yes
Normal
/ Is there any dropout part in the EFM siqnal of pin 36 of
,
IC2? -
Yes
Replace the disc or change the program.
Is the tracking error signal (pin 2 of IC2) being output?
____*
No No+m
Is the tracking signal being output
I
I
I
from the oickuo main unit?
I I,
I/
Yes Yes
*
rF$lace the 1
In the stop mode, is the tracking coil drive output (pin 4 of
‘7
Incorrect adjustment
1
CNPP) 0 SOmV? In the stop mode, adjust the tracking offset to 0
‘I 50mV.
/
j Yes
Is the tracking coil drive output being output from the
tracking driver output (pin 2 of IC4)?
I
Yes
- IC4 is defective.
i NO
The PWB negative pattern is damaged.
The pickup connecting connector is broken.
The pickup tracking coil is broken.
. ,
-24-

When the magazine is closed
without loading disc, does the
pickup lens tray move up and
down?
Is the EFM signal of pin 36 of IC2 1
being output?
No
+) l Pickup height error
--
-
/
l Laser diode output error
I
/ No
i
Are the voltages at pins 10 and 5
of the focus driver (IC4) +7.3V
and -7.3V, respectively?
I
Is the FRF disc reflection signal
of pin 69 of the servo signal
control (ICl) at a high level?
I
-i
!
-
Yes
Is the high/low level repetition
output for leading the focus servo
.
y ICl is defective. /
No
Yes
!
Yes
No
i
Yes
Is the output of pin 31 of IC2 as
shown below? _ ._
Pin 69 of ICI
FRF
Pin 31 of IC2
FE
Yes
*
Is the high/low repetition output
’
Check to see thit the focus circuit is normal and check
being output from pin 8 of IC4?
the distribution connector.
1 The pickup is defective. Replace it.
The servo amplifier (IC2) is
defective.
- The servo amplifier (IC2) is
No
defective.
- The focus driver (IC4) is defective. Replace it.
NO
) Yes
i
Check connectors CNS2A/B and,
CNP2.
- ,
-25-

Is the laser control signal of pin 38 (LANF) of the
microcomputer (IC801) at a low level?
+ Is the Q7 laser diode driver ’
No
emitter voltage +5V?
Yes
Replace the optical pickup.
Is the pickup returned to the innermost part?
Is the pickup in switch SW1 turned to ON?
Yes
Check if pins 57 (FEM+) and 58 (FEM-) of ICI are
outputting.
Defective
l ICl is defective. Replace it.
1
Normal
Check pin 8 of the slide motor driver (IC5).
Normal
The slide motor driver(lC5) is defective.Repace it.
Check if there is voltage at CNP3,CNSS and Ml.
Is there audio output?
!
No
Is there audio output from both L and-R channels?
Yes
e l Check the muting Transistor, Q6 and Q8 and replace.
No
l Check the sound coupling capacitors Cl5(L-CH)
andClG(R-CH).
1
Is there + 5V at IC9?
Yes
hi Check power circuits ICI2 and IC13.
No
r
Is pin 36 of ICSOI muting output at a high level?
e Replace IC801.
No
Yes
.
1 Is pin 3 of Q6 and Q8 at a low level?
\-
No
Check the voltage of QlO and Ql I and replace faulty
parts.
Yes
-26-