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Model
CMT-PX333 HCD-PX333
Pages
110
Size
14 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
cmt-px333-hcd-px333.pdf
Date

Sony CMT-PX333 / HCD-PX333 Service Manual ▷ View online

7
HCD-PX333
Notes on chip component replacement
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be
damaged by heat.
Flexible Circuit Board Repairing
• Keep the temperature of soldering iron around 270˚C
during repairing.
• Do not touch the soldering iron on the same conductor of the
circuit board (within 3 times).
• Be careful not to apply force on the conductor when soldering
or unsoldering.
The laser diode in the optical pick-up block may suffer electrostatic
break-down because of the potential difference generated by the
charged electrostatic load, etc. on clothing and the human body.
During repair, pay attention to electrostatic break-down and also
use the procedure in the printed matter which is included in the
repair parts.
The flexible board is easily damaged and should be handled with
care.
For CD
NOTES  ON  LASER  DIODE  EMISSION  CHECK
The laser beam on this model is concentrated so as to be focused on
the disc reflective surface by the objective lens in the optical pick-
up block. Therefore, when checking the laser diode emission,
observe from more than 30 cm away from the objective lens.
For MD
NOTES  ON  LASER  DIODE  EMISSION  CHECK
Never look into the laser diode emission from right above when
checking it for adjustment. It is feared that you will lose your sight.
NOTES  ON  HANDLING  THE  OPTICAL  PICK-UP
BLOCK  OR  BASE  UNIT
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK 
0
 OR DOTTED LINE WITH
MARK 
0
 ON THE SCHEMATIC DIAGRAMS AND IN THE PARTS
LIST ARE CRITICAL TO SAFE OPERATION. REPLACE THESE
COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS
APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS
PUBLISHED BY SONY.
This appliance is classified as a CLASS 1 LASER product. The
CLASS 1 LASER PRODUCT MARKING is located on the rear
exterior.
The following caution label is located inside the unit.
CAUTION
Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous radiation
exposure.
SECTION  1
SERVICING  NOTES
(Figure A)
ADVARSEL
Eksplosjonsfare ved feilaktig skifte av batteri.
Benytt samme batteritype eller en tilsvarende type
anbefalt av apparatfabrikanten.
Brukte batterier kasseres i henhold til fabrikantens
instruksjoner.
VARNING
Explosionsfara vid felaktigt batteribyte.
Använd samma batterityp eller en likvärdig typ som
 rekommenderas av apparattillverkaren.
Kassera använt batteri enligt gällande föreskrifter.
VAROITUS
Paristo voi räjähtää, jos se on virheellisesti asennettu.
Vaihda paristo ainoastaan laitevalmistajan suosittelemaan tyyppiin.
Hävitä käytetty paristo valmistajan ohjeiden mukaisesti.
CAUTION
Danger of explosion if battery is incorrectly replaced.
Replace only with the same or equivalent type recommended by
the manufacturer.
Discard used batteries according to the manufacturer’s instructions.
CLEANING  OBJECTIVE  LENS  OF  OPTICAL  PICK-UP
• In cleaning the objective lens of optical pick-up, be sure the
following below.
1. In cleaning the lens, do not apply an excessive force.
As the optical pick-up is vulnerable, application of excessive
force could damage the lens holder.
2. In cleaning, do not use a cleaner other than exclusive cleaning
liquid (KK-91 or isopropyl alcohol).
3. Wipe the objective lens spirally from center toward outside. (See
Figure A)
4. Eject the disk, if loaded.
5. Disconnect the power cord from the socket to shut off the power
supply.
6. When cleaning the objective lens of optical pick-up in CD, refer
to  “HOLDER (BU) ASS’Y” on page XX for removing
HOLDER (BU) ASS’Y.
8
HCD-PX333
SERVICE  POSITION
• In checking the MD mechanism deck section (MDM-7X2A), prepare two extension jigs (Part No. J-2501-100-A: 1.00 mm 27 core and
Part No. J-2501-198-A: 1.00 mm 17 core).
• In checking the CD mechanism deck section (CDM55A-21BD53), prepare extension jig (Part No. J-2501-075-A: 1.00 mm 21 core.)
MD mechanism deck section
(MDM-7X2A)
CN103
BD (MD) board
CD mechanism deck section
(CDM55A-21BD53)
Connect extension jig (J-2501-198-A) to the
BD (MD) board (CN103) and MD DIGITAL board (CN1004).
Connect extension jig (J-2501-100-A) to the
BD (MD) board (CN102) and MD DIGITAL board (CN1003).
CN1004
CN1003
CN101
BD (CD) board
CN1005
CN1002
MD DIGITAL board
Connect extension jig (J-2501-075-A) 
to the BD (CD) board (CN101) and 
MD DIGITAL board (CN1002).
CN1005
Pin 
2
 (GND)
Pin 
3
 (OUTSW)
CN102
harness
Note on Checking CD Mechanism Deck Section
In performing the operation check with the CD mechanism deck section removed from the main unit, the CD disc loading will be disabled if
the connector cable between MD DIGITAL board (CN1005) and LOADING board (CN151) is disconnected. Accordingly, make preparation
through the following steps.
1. Insert the CD disc for test with the set assembled.
2. Unplug the AC power cord to turn the power off, and remove the CD mechanism deck section. (Disconnect the connector cable between
MD DIGITAL board (CN1005) and LOADING board (CN151), and also the connector cable between MD DIGITAL board (CN1002)
and BD (CD) board (CN101))
3. Connect the CN1005 pin 3 (OUTSW) and pin 2 (GND) on the MD DIGITAL board with a lead wire.
4. Connect the connectors between MD DIGITAL board (CN1002) and BD (CD) board (CN101) with the extension tool (part No.: J-2501-
075-A).
Note 1:
Under this condition, the CD can be played but the disc loading operation is disabled.
Note 2:
After checking, disconnect the lead wire connected in step 3.
9
HCD-PX333
JIG FOR CHECKING BD (MD) BOARD WAVEFORM
The special jig (J-2501-196-A) is useful for checking the waveform of the BD (MD) board. The names of terminals and the checking items
to be performed are shown as follows.
I+3V : For measuring IOP (Check the deterioration of the optical pick-up laser)
IOP : For measuring IOP (Check the deterioration of the optical pick-up laser)
GND : Ground
TE
: Tracking error signal (Traverse adjustment)
FE
: Focus error signal
VC
: Reference level for checking the signal
RF
: RF signal (Check jitter)
I+3V
CN105
IOP
TE
VC
GND
FE
RF
I+3V
IOP
GND
TE
FE
VC
RF
I+3V
IOP
GND
TE
FE
VC
RF
1
7
for
MDM-7X2A
10
HCD-PX333
Note 1:
About “R”
As this unit has only a few buttons, some operations require the use of remote commander (RM-S55EN/provided with unit: 1-476-664-21)
buttons. These operations are indicated as “R” in this manual.
Example:
MENU/NO “R”
... Press the 
[MENU/NO]
 button of the remote commander.
Note 2:
Incorrect operations may be performed if the MD test mode is not entered properly.
In this case, press the
?/1
button to turn the power off, and retry to enter the MD test mode.
IOP  DATA  RECORDING  AND  DISPLAY  WHEN  OPTICAL  PICK-UP  AND  NON-VOLATILE  MEMORY  (IC195 OF  BD
(MD) BOARD) ARE  REPLACED
The IOP value labeled on the optical pick-up can be recorded in the non-volatile memory. By recording the value, it will eliminate the need
to look at the value on the label of the optical pick-up. When replacing the optical pick-up or non-volatile memory (IC195 of BD (MD)
board), record the IOP value on the optical pick-up according to the following procedure.
Record Procedure:
1. Press the
?
/
1
button to turn the power on.
2. Press the 
[FUNCTION]
 button to set the MD function.
3. Press three buttons of 
[             TUNING+]
[REC MODE]
, and  
.m
 (MD) simultaneously to enter the MD test mode and display
“[Check]”.
4. Press the
“R”
or
“R”
button to display “[Service]”.
5. Press the
ENTER/YES “R”
button to display “AUTO CHECK”, and press the
“R”
button to display “Iop Write”.
6. Press the
ENTER/YES “R”
button.
7. The display becomes “Ref= @@@.@” (@ is an arbitrary number) and the numbers which can be changed will blink.
8. Input the IOP value written on the optical pick-up.
To select the number : Press the
“R”
or
“R”
button.
To select the digit
: Press the 
[REC MODE]
 button after press the 
[CD SYNC NORMAL]
 button to display “IT”.
9. When the
ENTER/YES “R”
button is pressed, the display becomes “Measu=@@@.@” (@ is an arbitrary number).
10. As the adjustment results are recorded for the step 9 value. Leave it as it is and press the
ENTER/YES “R”
button.
11. “Complete!” will be displayed momentarily. The value will be recorded in the non-volatile memory and the display will become “Iop
Write”.
12. Press the 
[REPEAT STEREO/MONO]
 button to complete. “Initialize” will be displayed and release the MD test mode.
Display Precedure:
1. Press the
?
/1
button to turn the power on.
2. Press the 
[FUNCTION]
 button to set the MD function.
3. Press three buttons of 
[            TUNING+]
[REC MODE]
, and  
.m
 (MD) simultaneously to enter the MD test mode and display
“[Check]”.
4. Press the
“R”
or
“R”
button to display “[Service]”.
5. Press the
ENTER/YES “R”
button to display “AUTO CHECK”, and press the
“R”
button to display “Iop Read”.
6. Press the
ENTER/YES “R”
button.
7. “@@.@/##.#” is displayed and the recorded contents are displayed.
@@.@ : Indicates the Iop value labeled on the pick-up.
##.#
: Indicates the Iop value after adjustment.
8. Press the 
[REPEAT STEREO/MONO]
 button to complete. “Initialize” will be displayed and release the MD test mode.
WHEN MEMORY NG IS DISPLAYED
If the nonvolatile memory data is abnormal, “E001 MEMORY NG” will be displayed so that the MD deck does not continue operations. In
this case, set the test mode promptly and perform the following procedure.
Procedure:
1. Enter the MD test mode.
2. Normally a message for selecting the test mode will be displayed. However if the nonvolatile memory is abnormal, the following will be
displayed “INIT EEP?”.
3. Press the
x
(MD) and Z (MD) buttons simultaneously.
4. Press the
“R”
or
 >
 “R”
button to display “MDM-7X2A”.
5. Press the
ENTER/YES “R”
button. If the nonvolatile memory is successfully overwritten, the normal MD test mode will be set and a
message to select the MD test mode will be displayed.
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