Sharp CD-MPX870 User manual

CD-MPX870
SERVICE MANUAL
In the interests of user-safety the set should be restored to its
original condition and only parts identical to those specified be
used.
No. S6623CDMPX870
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.
PRECAUTIONS FOR USING LEAD FREE SOLDER
CHAPTER 1. GENERAL DESCRIPTION
[1] Specifications................................................. 1-1
[2] Names of parts............................................... 1-2
CHAPTER 2. ADJUSTMENTS
[1] Mechanism section........................................ 2-1
[2] Test mode ...................................................... 2-2
[3] CD section ..................................................... 2-4
[4] CD Changer mechanism section................... 2-5
CHAPTER 3. MECHANISM BLOCKS
[1] Caution on disassembly................................. 3-1
[2] Removing and reinstalling the main parts........ 3-4
CHAPTER 4. DIAGRAMS
[1] CD Block diagrams........................................ 4-1
[2] Main Block diagrams ..................................... 4-2
CHAPTER 5. CIRCUIT DESCRIPTION
[1] Waveforms of CD circuit ................................ 5-1
[2] Voltage........................................................... 5-2
CHAPTER 6. CIRCUIT SCHEMATICS AND PARTS
LAYOUT
[1] Notes on schematic diagram.........................6-1
[2] Types of transistor and LED..........................6-1
[3] Schematic diagram........................................6-2
[4] Wiring side of PWB .....................................6-10
CHAPTER 7. FLOWCHART
[1] Troubleshooting.............................................7-1
CHAPTER 8. OTHERS
[1] Function table of IC.......................................8-1
[2] FL Display .....................................................8-8
Parts Guide
MINI COMPONENT SYSTEM
CD-MPX870
MODEL
CD-MPX870 Mini Component System consisting of
CD-MPX870 (main unit) and CP-MPX870 (speaker
system).
CONTENTS

CD-MPX870
– i –
AudioXL-MP150Service ManualXLMP150MarketE
PRECAUTIONS FOR USING LEAD-FREE SOLDER
1. Employing lead-free solder
Example:
Indicates lead-free solder of tin, silver and copper.
2. Using lead-free wire solder
When fixing the PWB soldered with the lead-free solder, apply lead-free wire solder. Repairing with conventional lead wire
solder may cause damage or accident due to cracks.
As the melting point of lead-free solder (Sn-Ag-Cu) is higher than the lead wire solder by 40 C, we recommend you to
use a dedicated soldering bit, if you are not familiar with how to obtain lead-free wire solder or soldering bit, contact our
service station or service branch in your area.
3. Soldering
As the melting point of lead-free solder (Sn-Ag-Cu) is about 220 C which is higher than the conventional lead solder
and as it has poor solder wettability, you may be apt to keep the soldering bit in contact with the PWB for
extended period of time. However, since the land may be peeled off or the maximum heat-resistance temperature
of parts may be exceeded, remove the bit from the PWB as soon as you confirm the steady soldering condition.
Lead-free solder contains more tin, and the end of the soldering bit may be easily corrected. Make sure to turn on
and off the power of the bit as required.
If a different type of solder stays on the tip of the soldering bit, it is alloyed with lead-free solder. Clean the bit after
every use of it.
When the tip of the soldering bit is blackened during use, file it with steel wool or fine sandpaper.
Be careful when replacing parts with polarity indication on the PWB silk.
Lead-free wire solder for servicing
Ref No. Description Parts No.
PWB-A 92LPWB6572MANS
92LPWB6274LEDS
PWB-C
PWB-D
MAIN (A1), POWER (A2)
PWB-B 92LPWB6572DPLS
92LPWB6514CDUS
DISPLAY (B1), GAME INPUT (B2)
CD SERVO
LED
QPWBF0027AWZZ
QPWBF1055AWZZ
PWB-E
PWB-F
CD MOTOR (PWB ONLY)
CD CHANGER MOTOR (PWB ONLY)
"MAIN, DISPLAY, POWER, JACK, CD SERVO, CD MOTOR (PWB ONLY),
CD CHANGER MOTOR (PWB ONLY), LED PWB" of this model employs lead-free solder.
The LF symbol indicates lead-free solder, and is attached on the PWB and service manuals. The alphabetical character
following LF shows the type of lead-free solder.
by 40 C,

CD-MPX870
–2
CHAPTER 1: GENERAL DESCRIPTION
[1] Specifications
FOR A COMPLETE DESCRIPTION OF THE OPERATION OF THIS UNIT, PLEASE REFER
TO THE OPERATION MANUAL.
As part of our policy of continuous improvement, SHARP reserves
the right to make design and specifcation changes for product
improvement without prior notice. The performance specifcation
figures indicated are nominal values of production units .There may
be some deviations from these values in individual units.
■
■
■
■
■
General
Amplifier
Power source AC 120 V, 60 Hz
Power consumption 135 W
Dimensions Width: 10-1/4" (260 mm)
Height: 13" (330 mm)
Depth: 12-7/8" (323 mm)
Weight 17.09 lbs. (7.75 kg)
Output power MPO: 600 W (300 W + 300 W) (10% T.H.D.)
RMS: 300 W (150 W + 150 W) (10% T.H.D.)
RMS: 240 W (120 W + 120 W) (0.9% T.H.D.)
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
CD player
Tuner
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
Cassette deck
■Front Speaker
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
Super tweeter
2" (5 cm) tweeter
6-5/16" (16 cm) woofer
Maximum input
power
300 W
Rated input power 150 W
Impedance 6 ohms
Dimensions Width: 7-7/8" (200 mm)
Height: 13" (330 mm)
Depth: 9-1/8" (231 mm)
Weight 7.3 lbs. (3.3 kg) /each
1 – 1

CD-MPX870
– 3
[2] Names of parts
Display
Rear panel
Front panel
1. Disc Trays
2. Timer Indicator
3. Tuner (Band) Button
4. CD Button
5. ON/STAND-BY Button
6. Tape (1 2) Button
7. Game/Video Button
8. Tape 1 Cassette Compartment
9. Headphone Jack
10. Game/Video Input Jacks
11. Disc Tray Open/Close Button
12. Disc Number Select Buttons
13. Volume Control
14. CD or Tape Stop Button
15. CD Play or Repeat, Tape Play Button
16. CD Track Up or Fast Forward, Tape 2 Fast Forward,
Tuner Preset Up, Time Up Button
17. CD Track Down or Fast Reverse, Tape 2 Rewind,
Tuner Preset Down, Time Down Button
18. Tape 2 Cassette Compartment
19. Remote Sensor
1. Disc Number Indicators
2. MP3/WMA Folder Indicator
3. MP3/WMA Title Indicators
4. MP3 Indicator
5. WMA Indicator
6. Sleep Indicator
7. Timer Play Indicator
8. Timer Recording Indicator
9. Tape 2 Record Indicator
10. MP3/WMA Total Indicator
11. Daily Timer Indicator
12. FM Stereo Mode Indicator
13. FM Stereo Receiving Indicator
14. Tape Play Indicator
15. Memory Indicator
16. Extra Bass Indicator
17. Disc Repeat Play Indicator
18. Disc Pause Indicator
19. Disc Play Indicator
1. Cooling Fan
2. AC Power Cord
3. FM 75 Ohms Antenna Jack
4. AM Antenna Ground Terminal
5. AM Loop Antenna Terminal
6. Speaker Light-up Jacks
7. Video out Jack
8. Front Speaker Terminals
12 3 45 6789
11 1213
10 14
15
16 17
18 19
7
8
2
1
3
4
5
6
Speaker system
1. Tweeter
2. Super Tweeter
3. Woofer
4. Bass Reflex Duct
5. Speaker Wire
6. Speaker Light-Up Wire
11
2
3
4
5
6
1 – 2

CD-MPX870
–2
Remote control
1. Remote Control Transmitter
2. Disc Number Select Buttons
3. Clock/Timer Button
4. Character Input/Disc Direct Search Buttons
5. Equalizer Mode Select Button
6. Extra Bass/Demo Button
7. ON/STAND-BY Button
8. CD Button
9. Tuner (Band) Button
10. Tape (1 2) Button
11. Game/Video Button
12. Volume Up and Down Buttons
13. Disc Clear/Dimmer Button
14. Disc Random Button
15. Disc Stop Button
16. Tape Stop Button
17. Memory Button
18. Disc Pause Button
19. Disc Play or Repeat Button
20. Tape Play Button
21. Tape 2 Record Pause Button
22. Tuning Up, Cursor Up Button
23. Disc Track Up or Fast Forward, Tape 2 Fast Forward,
Tuner Preset Up, Time Up, Cursor Right Button
24. Disc Track Down or Fast Reverse, Tape 2 Rewind,
Tuner Preset Down, Time Down, Cursor Left Button
25. Tuning Down, Cursor Down Button
26. MP3/WMA Navigation Mode Select Button
27. Character Button
28. MP3/WMA Display Button
29. Enter Button
1
2
3
5
6
12
4
8
9
7
10
11
17
19
18
13
15
14
21
20
16
25
24
22 23
26 27 28 29
1 –3

CD-MPX870
2 – 1
CD-ES700/CD-ES77CD-ES700/CD-ES77Service ManualCD-ES700/CD-ES77MarketE
CHAPTER 2. ADJUSTMENTS
[1] Mechanism section
• Driving Force Check
• Torque Check
• Tape Speed
Figure 1
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 Resistorin
motor.
3,000 ±30 Hz
Speaker Speaker Ter- minal (Load
resistance: 6
ohms)
TAPE MECHANISM
Tape
Motor
Variable Resistor in motor

CD-MPX870
2 – 2
[2] Test mode
•Setting the test mode
During stand-by mode, press GAME/VIDEO button
while pressing down the button and 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-MPX870
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-MPX870
2 – 4
[3] 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 display instead of 'ER-CD**'. 'ER-CD**' display will
only be display when error had been detected for the 5th times.
Speaker abnormal detection and +B PROTECTION display
In case speaker abnormal detection or +B PROTECTION had occurred, the unit will automatically enter to stand - by
mode and Timer indicator will be flashing as below.
+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 button, press the GAME/VIDEO button. The Micro Computer
version number will be displayed as "CM*****".
3. Press button until "WAIT"→"FINISHED" appears.
4. Unplug the AC cord and the unit is ready for transporting.
Error Explanation
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 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.
FM 87.5 MHz
FLASHING
1 FRAME
OFF OFF OFF OFF
(REPEAT)
ON
TIMER
LED
ON
NO. 1
NO. 2
NO. 1
NO. 2
NO.1 : +B Protection
NO.2 : Speaker abnormal
FLASHING
Example : In case of speaker abnormal

CD-MPX870
2 – 5
[4] CD Changer mechanism section
• All numbers in the drawing correspond to those in parts guide (CHANGER MECHANISM PARTS).
140
141
HALF GEAR
MUST BE ARRANGED AS SHOWN
1

CD-MPX870
2 – 6
2
139
APPLY SANKOL SHS1001 BEFORE FIX
FIX ITEM 139 ACCORDING TO THE
PICTURE AS SHOWN ABOVE
ROTATE MODE BIG GEAR UNTIL REACH AS SHOWN IN PICTURE

CD-MPX870
2 – 7
APPLY GREASE SC141
PULL THE LEVER UNITIL
REACH THE ARROW MARK
143
112
3

CD-MPX870
2 – 8
FIGURE 1
FIGURE 2
APPLY GREASE SC141 SLOT CLAMP
SWITCH ARM INSIDE BASE SLOT HALF GEAR MUST BE
ARRANGED AS SHOWN
152
142
118
4

CD-MPX870
2 – 9
127
128
5
APPLY GREASE SC141 AT BOTTOM SIDE
OF GEAR FOLLOW MARKING (REFER TO GRAY AREA)
NO NEED TO APPLY GREASE AT BOTTOM
SIDE
CORRECT
BLACK MARK
FIGURE 1
INCORRECT
IF DIRECTION IS OTHER THAN DIRECTION
SHOWN IN FIGURE 1, IT IS INCORRECT
APPLY GREASE SC141
AT TOP SIDE OF GEAR
FOLLOW MARKING
(REFER TO GRAY AREA)

CD-MPX870
2 – 10
APPLY GREASE SC141 AT
HALF GEAR AREA
ROTATE CLOCKWISE UNTIL REACH HERE (MAXIMUM)
6
129

CD-MPX870
2 – 11
151150149
7

CD-MPX870
2 – 12
124
131
GREASE SC141 APPLICATION LENGTH
GREASE APPLICATION PORTION
THE SHOWN AREA MUST FREE FROM GREASE
CORRECT
INCORRECT
SHOWN HOLE MUST FACING ARROW DIRECTION
8

CD-MPX870
2 – 13
TR-RE JOINT GEAR C
APPLY GREASE SC141
AT BOTTOM SIDE
ONLY
APPLY GREASE SC141 ONLY AT TOP SIDE GEAR
MUST BE FIXED ACCORDINGLY TO
THE HOLE'S
138 126 125
9

CD-MPX870
2 – 14
10
148 147 146 145

CD-MPX870
2 – 15
APPLY GREASE SC141
WHEN FIXING ITEM 144 MUST FOLLOW AS SHOWN
121
144
130
11