Sharp CD-MPS900 User manual

CD-MPS900/CD-MPS99
SERVICE MANUAL
No. S4414CDMPS900
SHARP CORPORATION
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.
This document has been published to be used
for after sales service only.
The contents are subject to change without notice.
CHAPTER 1. GENERAL DESCRIPTION
[1] Specifications ................................................. 1-1
[2] Names of parts............................................... 1-2
CHAPTER 2. ADJUSTMENTS
[1] Mechanism section ........................................ 2-1
[2] Tuner section ................................................. 2-1
[3] TEST MODE .................................................. 2-2
[4] CD section...................................................... 2-4
[5] CD Changer mechanism section ................... 2-5
CHAPTER 3. MECHANISM BLOCKS
[1] Caution on diassembly................................... 3-1
[2] Removing and reinstalling the main parts........ 3-4
CHAPTER 4. DIAGRAMS
[1] Block diagrams............................................... 4-1
CHAPTER 5. CIRCUIT DESCRIPTION
[1] Notes on schematic diagram.......................... 5-1
[2] Types of transistor and LED........................... 5-1
[3] Waveforms of CD circuit ................................ 5-2
[4] Voltage ........................................................... 5-3
CHAPTER 6. CIRCUIT SCHEMATICS AND PARTS
LAYOUT
[1] Schematic diagram........................................6-1
[2] Wiring side of PWB...................................... 6-11
CHAPTER 7. FLOWCHART
[1] Troubleshooting .............................................7-1
CHAPTER 8. OTHERS
[1] Function table of IC .......................................8-1
[2] FL Display....................................................8-10
Parts Guide
In the interests of user-safety the set should be restored to its
original condition and only parts identical to those specified be
used.
MINI COMPONENT SYSTEM
CD-MPS900
MODEL
CD-MPS99
MODEL
CD-MPS900 Mini Component System consisting of CD-MPS900
(main unit) and CP-MPS900 (speaker system).
CD-MPS99 Mini Component System consisting of CD-MPS99
(main unit) and CP-MPS99 (speaker system).
MINI COMPONENT SYSTEM
MINI COMPONENT SYSTEM
CONTENTS

CD-MPS900/CD-MPS99
– i –
IMPORTANT SERVICE NOTES
BEFORE RETURNING THE AUDIO PRODUCT
BEFORE RETURNING THE AUDIO PRODUCT
(Fire & Shock Hazard)
Before returning the audio product to the user, perform the following
safety checks.
1. Inspect all lead dress to make certain that leads are not pinched or
that hardware is not lodged between the chassis and other metal
parts in the audio product.
2. Inspect all protective devices such as insulating materials, cabinet,
terminal board, adjustment and compartment covers or shields,
mechanical insulators etc.
3. To be sure that no shock hazard exists, check for leakage current in
the following manner.
* Plug the AC line cord directly into a 120 volt AC outlet.
* Using two clip leads, connect a 1.5 kohm, 10 watt resistor paralleled
by a 0.15 µF capacitor in series with all exposed metal cabinet parts
and a known earth ground, such as conduit or electrical ground con-
nected to earth ground.
* Use a VTVM or VOM with 1000 ohm per volt, or higher, sensitivity to
measure the AC voltage drop across the resistor (See diagram).
* Connect the resistor connection to all exposed metal parts having a
return path to the chassis (antenna, metal cabinet, screw heads,
knobs and control shafts, escutcheon, etc.) and measure the AC
voltage drop across the resistor.
All check must be repeated with the AC line cord plug connection
reversed.
Any reading of 0.3 volt RMS (this corresponds to 0.2 milliamp. AC.) or
more is excessive and indicates a potential shock hazard which must
be corrected before returning the audio product to the owner.
TO EXPOSED
METAL PARTS
CONNECT TO
KNOWN EARTH
GROUND
TEST PROBE
0.15 mF
1.5 kohms
10 W
VTVM
AC SCALE

CD-MPS900/CD-MPS99
1 – 1
AudioCD-MPS900/CD-MPS99Service ManualCD-MPS900/CD-MPS99MarketE
CHAPTER 1. GENERAL DESCRIPTION
[1] Specifications
General
Amplifier
CD player
Tuner
Cassette deck
Power source AC 120 V, 60 Hz
Power consump-
tion
185 W
Dimensions Width: 10-1/4" (260 mm)
Height: 13" (330 mm)
Depth: 12-7/8" (326 mm)
Weight 23.0 lbs. (10.4 kg)
Output power 220 watts minimum RMS per channel into 6
ohms from 100 Hz to 20 kHz, 10% total har-
monic distortion
Output terminals Speakers: 6 ohms
Headphones: 16 - 50 ohms
(recommended: 32 ohms)
Video output: 1Vp-p
Input terminals Game/Auxiliary (audio signal):
500 mV/47 k ohms
Game/Video: 1Vp-p
Type 5-disc multi-play compact disc player
Signal readout Non-contact, 3-beam semiconductor laser
pickup
D/A converter 1-bit D/A converter
Frequency
response
20 - 20,000 Hz
Dynamic range 90 dB (1 kHz)
Frequency range FM: 87.5 - 108.0 MHz
AM: 530 - 1,720 kHz
Frequency
response
50 - 14,000 Hz (normal tape)
Signal/noise ratio 55 dB (TAPE-1 playback)
50 dB (TAPE-2 recording/playback)
Wow and flutter 0.3 % (WRMS)
Type 3-way type speaker system
with passive radiator
Super tweeter x 2
2" (5 cm) tweeter x 1
6-1/2" (16 cm) woofer x 1
4" (10 cm) passive radiator
Maximum input
power
440 W
Rated input power 220 W
Impedance 6 ohms
Dimensions Width: 10-7/8" (277 mm)
Height: 13" (330 mm)
Depth: 11" (279 mm)
Weight 10.6 lbs. (4.8 kg)/each
CD-MPS900/CD-MPS99
CP-MPS900/CP-MPS99
Specifications for this model are subject to change without
prior notice.
FOR A COMPLETE DESCRIPTION OF THE OPERATION OF THIS UNIT, PLEASE REFER
TO THE OPERATION MANUAL.

CD-MPS900/CD-MPS99
1 – 2
[2] Names of parts
Front panel
1. Disc Trays
2. Timer Indicator
3. Power On/Stand-by Button
4. Disc Track Up or Fast Forward, Tape 2 Fast Forward,
Tuner Preset Up, Time Up Button
5. Clock/Timer Button
6. Tuning Up Button
7. Tuning Down Button
8. Disc Track Down or Fast Reverse, Tape 2 Rewind,
Tuner Preset Down, Time Down Button
9. Equalizer Mode Select Button
10. Tape 1 Cassette Compartment
11. Headphone Jack
12. Game/Video Input Jacks
13. Disc Number Select Buttons
14. Disc Direct Play Button
15. Disc Tray Open/Close Button
16. Character Button
17. Enter Button
18. Disc Play or Repeat, Tape Play Button
19. Memory/Set Button
20. Tape 2 Record Pause Button
21. MP3 Disc Navigation Mode Select Button
22. Disc or Tape Stop Button
23. Cursor Buttons
24. Extra Bass/Demo Mode Button
25. Volume Control
26. Tape 2 Cassette Compartment
27. Tuner (Band) Button
28. CD Button
29. Tape (1 2) Button
30. Game/Video Button
1
13
15
25
17
19
23
24
3
2
5
6
7
16
22
21
26
14
20
11
8
12
4
9
10
28 29 3027
18
Display
1. Disc Number Indicators
2. MP3 Folder Indicator
3. MP3 Title Indicators
4. MP3 Total Indicator
5. Sleep Indicator
6. Timer Play Indicator
7. Timer Recording Indicator
8. Tape 2 Record Indicator
9. Daily Timer Indicator
10. FM Stereo Mode Indicator
11. FM Stereo Receiving Indicator
12. Memory Indicator
13. Tape Play Indicator
14. MP3 Disc Indicator
15. Extra Bass Indicator
16. Disc Repeat Play Indicator
17. Disc Pause Indicator
18. Disc Play Indicator
Rear panel
1. Cooling Fan
2. AC Power Cord
3. FM 75 Ohms Antenna Terminal
4. FM Antenna Ground Terminal
5. AM Loop Antenna Jack
6. Video Output Jack
7. Speaker Terminals
1
5
3
6
4
7
2
4 5321 7 8 9
13
1110 12
14 15 16
17 18
6
CD-MPS900/CD-MPS99

CD-MPS900/CD-MPS99
1 – 3
Remote control
1. Remote Control Transmitter
2. Disc Number Select Buttons
3. Clock/Timer Button
4. Character Input/Disc Direct Search Buttons
5. MP3 Disc Navigation Mode Select Button
6. Enter Button
7. Memory/Set Button
8. Tape 2 Record Pause Button
9. Disc Track Down or Fast Reverse, Tape 2 Rewind,
Tuner Preset Down, Time Down Button
10. Disc or Tape Stop Button
11. CD Button
12. Tuner (Band) Button
13. Equalizer Mode Select Button
14. Extra Bass Button
15. Power On/Stand-by Button
16. Disc Random Button
17. Character Button
18. Cursor Buttons
19. Disc Clear/Dimmer Button
20. Disc Pause Button
21. Disc Track Up or Fast Forward, Tape 2 Fast Forward,
Tuner Preset Up, Time Up Button
22. Disc Play or Repeat, Tape Play Button
23. Tape (1 2) Button
24. Game/Video Button
25. MP3 Disc Display Button
26. Volume Up and Down Buttons
1
2
3
4
5
7
9
15
16
17
18
19
24
25
26
12
13
10
21
22
23
20
14
6
8
11
1. Tweeter
2. Passive Radiator
3. Woofer
4. Super Tweeters
5. Speaker Wire
1
2
35
4
CD-MPS900/CD-MPS99
CP-MPS900/CP-MPS99

CD-MPS900/CD-MPS99
2 – 1
AudioCD-MPS900/CD-MPS99Service ManualCD-MPS900/CD-MPS99MarketE
CHAPTER 2. ADJUSTMENTS
[1] Mechanism section
• Driving Force Check
• Torque Check
• Tape Speed
Figure 1
[2] Tuner section
fL: Low-range frequency
fH: High-range frequency
• AM IF/RF
Signal generator: 400 Hz, 30%, AM modulated
•FMRF
Signal generator: 1 kHz, 40 kHz dev., FM modulated
•FMIF
Signal generator: 10.7 MHz, FM modulated
Figure 2 Adjustment Points
Torque Meter Specified Value
Play: TW-2111 Tape 1: Over 80 g
Tape 2: Over 80 g
Torque Meter Specified Value
Tape 1 Tape 2
Play: TW-2111 30 to 80 g.cm 30 to 80 g.cm
Fast forward: TW-2231 — 70 to 180 g.cm
— 70 to 180 g.cm
Test Tape Adjust-
ing Point
Specified
Value
Instrument
Connection
Normal
speed
MTT-111 Variable
Resistor in
motor.
3,000 ±30 Hz
Speaker
Speaker Ter-
minal (Load
resistance: 6
ohms)
Test Stage Frequency Frequency
Display
Setting/
Adjusting
Parts
Instrument
Connection
AM IF 450 kHz 1,720 kHz T351 *1
AM Band
Coverage
— 530 kHz (fL): T306
1.1 ±0.1 V
*2
AM
Tracking
990 kHz 990 kHz (fL): T303 *1
*1. Input: Antenna Output: TP302
*2. Input: Antenna Output: TP301
TAPE MECHANISM
Tape
Motor
Variable Resistor in motor
Test
Stage
Frequency Frequency
Display
Setting/
Adjusting
Point
Instrument
Connection
FM Band
Coverage
— 87.50 MHz T301 (fL):
1.3 V ±0.1 V
*1
FM RF 98.00 MHz
(10-30 dB)
98.00 MHz L312 *2
*1. Input: Antenna Output: TP301
*2. Input: Antenna Output: Speaker terminal
Test
Stage
Frequency Frequency
Display
Setting/Adjust-
ing Point
Instrument
Connection
IF 10.7 MHz 98 MHz T302 (Turn the
core of trans-
former T302
fully counter
clockwise)
*1
AM IF
FM RF
TP301
TP302
FM IF
T301
T302
R356
R381
T303
T306
IC301
L312
T351
CNP301
AM/FM LOOP ANTENNA
FM BAND
COVERAGE fL
AM BAND
COVERAGE fL
AM TRACKING
fL
MAIN PWB
1

CD-MPS900/CD-MPS99
2 – 2
[3] TEST MODE
•Setting the test mode
During stand-by mode, press ON/STAND-BY button while pressing
down the button and X-BASS/DEMO button. then, press the CD
button to enter the test mode.
IL isn’t done
OPEN/CLOSE operation is using manual. IL isn’t done
<< >>,<< >>buttons make pick's slide possible. IL isn’t done
to page 2-3
<<PLAY>> key input.
C D T E S T
A
Do TOC IL. Do normal play.
When these following key is input into PLAY key, track num-
ber can be appoint directly.
<<MEMORY>>
key input.
<< 1>> key: Track 4
<< 2>> key: Track 9
<< 3>> key: Track 15
Adjustment result automatically will
display as below for each 2 sec:
a) "FOF_XXXX"
b) "TOF_XXXX"
c) "TBAL_XX"
d) "TGAN_XX"
f) "FGAN_XX"
g) "RFLS_XX"
––––––––
<<STOP>> key input.
STOP
explanation:
a) Focus off set = "FOF_XXXX"
b)Tracking off set = "TOF_XXXX"
c)Tracking balance = "TBAL_XX"
d)Tracking Gain = "TGAN_XX"
f) Focus Gain = "FGAN_XX"
g) RF level shift = "RFLS_XX"
VOL — Last memory
P.GEQ — FLAT
X-BASS — OFF
To cancel : Power OFF

CD-MPS900/CD-MPS99
2 – 3
Sliding the PICKUP with<< >>, << >> button must only be
in STOP mode.
<<MEMORY>> key input.
Laser ON.
<<MEMORY>> key input.
Tracking OFF play at that specific point.
<<MEMORY>> key input.
Tracking ON play from that specific point.
<<MEMORY>> key input.
Adjustment result automatically will display as below for each 2 sec :
a) "FOF_XXXX"
b) "TOF_XXXX"
c) "TBAL_XX"
d) "TGAN_XX"
f) "FGAN_XX"
g) "RFLS_XX"
<<STOP>> key input.
STOP
explanation:
a) Focus off set = "FOF_XXXX"
b)Tracking off set = "TOF_XXXX"
c)Tracking balance = "TBAL_XX"
d)Tracking Gain = "TGAN_XX"
f) Focus Gain = "FGAN_XX"
g) RF level shift = "RFLS_XX"
VOL — Last memory
P.GEQ — FLAT
X-BASS — OFF
To cancel : Power OFF
A

CD-MPS900/CD-MPS99
2 – 4
[4] CD section
CD Error code description
* 'CHECKING'
If Error is detected, 'CHECKING' will be displayed instead of 'ER-
CD**'. 'ER-CD**' display will only be displayed when error had been
detected for the 5th times.
Standard Specification of Stereo System Error Message Display Contents
(*) CHECKING:
If CD changer mechanism error is detected, 'CHECKING' will be dis-
play instead of 'ER-CD**'. 'ER-CD**' display will only be display when
error had been detected for the 5 th times.
Speaker abnormal detection and +B PROTECTION display
In case speaker abnormal detection or +B PROTECTION had
occurred, it can be check by pressing 'POWER', ' ' and 'X-BASS'
button. MicroComputer version number will displayed as "XM******".
Press ‘VIDEO/AUX’ button during version number display and then
press ‘POWER’, ‘MEMORY/SET’ and ‘VIDEO/AUX’ button. Display
will show "S** B**". S is referring to speaker abnormal detection and B
is referring to +B PROTECTION. ** is in hex valve.
+B PROTECTION is condition when irregular process occur on power
supply line.
BEFORE TRANSPORTING THE UNIT
The following process need to be taken after set tapering/parts
replacement.
1. Press the ON/STAND-BY button to enter stand-by mode.
2. While pressing down the button and the X-BASS/DEMO but-
ton, press the ON/STAND-BY button. The Micro Computer version
number will be displayed as "XM******".
3. Press OPEN/CLOSE button until "WAIT"→"FINISHED" appears.
4. Unplug the AC cord and the unit is ready for transporting.
Error Explanation
01 When Pickup set inner position, inner switch cannot detect
'ON' level for 10 secs.
10* CAM error. Can't detect CAM switch when CAM is moving.
11* When it detect cam operation error during initialize pro-
cess.
20* TRAY error. Can't detect TRAY switch when TRAY is mov-
ing.
21* When it detect TRAY operation error during initialize pro-
cess.
31 When it change to CD function, DSP cannot read initial
data.
Error Contents Display Notes
CD Pickup Mechanism Error. 'ER-CD01' PU-IN SW Detection NG.
CD Changer Mechanism Error. 'ER-CD**' (*) 10: CAM SW Detection NG during normal operation
11: CAM SW Detection NG during initialize process
20:TRAY SW Detection NG during normal operation
21:TRAY SW Detection NG during initialize process
CD DSP Communication Error. 'ER-CD31' DSP COMMUNICATION ERROR.
Focus Not Match/IL Time Over. 'NO DISC'
TUNER PLL Unlock. PLL Unlock.
F
M 87.5 MH
z

CD-MPS900/CD-MPS99
2 – 5
[5] CD Changer mechanism section
• A number in the drawing sheet is the number of the parts guide
(CHANGER MECHANISM PARTS).
140
141
HALF GEAR
MUST ARRANGE AS SHOWN
1

CD-MPS900/CD-MPS99
2 – 6
139
2
APPLY SANKOL BEFORE FIX
FIX ITEM 1 ACCORDING TO THE
SHOWN PICTURE ABOVE
ROTATE MODE BIG GEAR UNTIL REACH AS SHOWN IN PICTURE

CD-MPS900/CD-MPS99
2 – 7
APPLY GREASE
PULL THE LEVER UNITIL
REACH THE ARROW MARK
143
112
3

CD-MPS900/CD-MPS99
2 – 8
FIGURE 1
FIGURE 2
APPLY GREASE SLOT CLAMP SW ARM INSIDE BASE SLOT
152
142
118
4

CD-MPS900/CD-MPS99
2 – 9
127
128
5
APPLY GREASE AT BOTTOM SIDE
OF GEAR FOLLOW MARKING
NO NEED APPLY GREASE AT BOTTOM
SIDE
O.K
BLACK MARK
FIGURE 1
N.G
OTHER THAN FIGURE 1 DIRECTION ALL N.G
APPLY GREASE AT
TOP SIDE OF GEAR
FOLLOW MARKING

CD-MPS900/CD-MPS99
2 – 10
APPLY GREASE AT
HALF GEAR AREA
ROTATE CLOCKWISE UNTIL REACH HERE (MAXIMUM)
6
129

CD-MPS900/CD-MPS99
2 – 11
CHANGE COLOR TO BLACK
150151148
7

CD-MPS900/CD-MPS99
2 – 12
124
131
TRAY BIG GEAR
CHANGE COLOR
TO BLACK
TRAY BIG GEAR
CHANGE COLOR
TO BLACK
GREASE APPLICATION LENGTH
GREASE APPLICATION PORTION
MUST FREE FROM GREASE THE SHOWN AREA
O.K
N.G
SHOWN HOLE MUST FACING ARROW DIRECTION
8

CD-MPS900/CD-MPS99
2 – 13
TR-RE JOINT GEAR C
APPLY GREASE AT
BOTTOM SIDE ONLY
APPLY GREASE ONLY AT TOP SIDE GEAR
MUST FIX ACCORDING TO THE HOLE'S
138 126 125
9

CD-MPS900/CD-MPS99
2 – 14
10
148 147 146 145

CD-MPS900/CD-MPS99
2 – 15
APPLY GREASE
WHEN FIXING ITEM 2 MUST FOLLOW AS SHOWN
121
144
130
11