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Extracted text from sony hcd gx 250 service manual (Ocr-read)
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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.
ATTENTION AU COMPOSANT AYANT RAPPORT
ร- LA SรCURITร!
LES COMPOSANTS IDENTIFรS PAR UNE MARQUE 0 SUR LES
DIAGRAMMES SCHรMATIQUES ET LA LISTE DES PIรCES SONT
CRITIQUES POUR LA SรCURITร DE FONCTIONNEMENT. NE
REMPLACER CES COMPOSANTS QUE PAR DES PIรSES SONY
DONT LES NUMรROS SONT DONNรS DANS CE MANUEL OU
D ANS LES SUPPรMENTS PUBLIรS PAR SONY.
After correcting the original service problem, perform the
following safety checks before releasing the set to the customer:
Check the antenna terminals, metal trim, metallized knobs, screw\
s,
and all other exposed metal parts for AC leakage. Check leakage as
described below.
LEAKAGE
The AC leakage from any exposed metal part to earth ground
and from all exposed metal parts to any exposed metal part having
a return to chassis, must not exceed 0.5 mA (500 microamperes).
Leakage current can be measured by any one of three methods.
1. A commercial leakage tester, such as the Simpson 229 or RCA WT-540A. Follow the manufacturers instructions to use these
instruments.
2. A battery-operated AC milliammeter. The Data Precision 245 digital multimeter is suitable for this job.
3. Measuring the voltage drop across a resistor by means of a VOM or battery-operated AC voltmeter. The limit indication
is 0.75 V, so analog meters must have an accurate low-voltage
scale. The Simpson 250 and Sanwa SH-63Trd are examples of
a passive VOM that is suitable. Nearly all battery operated
digital multimeters that have a 2V AC range are suitable. (See
Fig. A)
SAFETY CHECK-OUT
HCD-GX250 The release method of a CD disc tray LOCK function
There is a disc lock function for the disc theft prevention for a
demonstration at a shop front in this machine.
Procedue:
1. Press the
?/1 button to turn the set on.
2. Press two buttons of x and Z (EJECT) simultaneously for
fi ve seconds.
3. The message LOCKED is displayed and the tray is locked. (Even if exiting from this mode, the tray is still locked.)
4. Press two buttons of x and Z (EJECT) simultaneously for
fi ve seconds again.
5. The message UNLOCKED is displayed and the tray is
unlocked.
6. To exit from this mode, press the ?/1 b utton to turn the set
off.
To Exposed Metal
Par ts on Set
0.15 ยตF
1.5 k-ฆ AC
V
oltmeter
(0.75 V)
Earth Ground
Fig. A. Using an AC voltmeter to check AC leakage.
Unleaded solder
Boards requiring use of unleaded solder are printed with the lead-
free mark (LF) indicating the solder contains no lead.
(Caution: Some printed circuit boards may not come printed with
the lead free mark due to their particular size.)
: LEAD FREE MARK
Unleaded solder has the following characteristics.
- Unleaded solder melts at a temperature about 40ยฐC higher than
ordinary solder. Ordinary soldering irons can be used but the iron tip has to be
applied to the solder joint for a slightly longer time. Soldering irons using a temperature regulator should be set to
about 350ยฐC. Caution: The printed pattern (copper foil) may peel away if the
heated tip is applied for too long, so be careful!
- Strong viscosity
Unleaded solder is more viscous (sticky, less prone to flow) than
ordinary solder so use caution not to let solder bridges occur such
as on IC pins, etc.
- Usable with ordinary solder
It is best to use only unleaded solder but unleaded solder may
also be added to ordinary solder.
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HCD-GX250
This appliance is classified as a CLASS 1 LASER product. The
CLASS 1 LASER PRODUCT MARKING is located on the rear
exterior.
Laser component in this product is capable
of emitting radiation exceeding the limit for
Class 1.
CAUTION
Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous radiation
exposure.
Notes on chip component replacement
-N ever reuse a disconnected chip component.
- Notice that the minus side of a tantalum capacitor may be
damaged by heat.
Flexible Circuit Board Repairing
-K eep the temperature of soldering iron around 270หC
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.
NOTES ON HANDLING THE OPTICAL PICK-UP
BLOCK OR BASE UNIT
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.
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. T ABLE OF CONTENTS
1. SERVICING NOTE
ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท\
ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท\
ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท\
ยทยทยทยท 4
2. GENERAL ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท\
ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท\
ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท\
ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท\
ยทยท 6
3. DISASSEMBLY
3-1. Cover (Top) ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท\
ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท\
ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท\
ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท 9
3-2. CD Door ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท\
ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท\
ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท\
ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท\
ยทยท 9
3-3. Front Panel Section ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท\
ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท\
ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท\
ยท 10
3-4. CD Mechanism Deck (CDM74-K6BD80) ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท\
ยท 10
3-5. Tape Mechanism Deck, GAME JACK Board ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท 11
3-6. PANEL Board ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท\
ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท\
ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท\
ยทยทยทยทยทยทยทยทยท 11
3-7. BACK PANEL Section, SUB-TRANS Board ยทยทยทยทยทยทยทยทยทยทยทยทยทยท 12
3-8. Power Transformer ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท\
ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท\
ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท\
ยท 12
3-9. MAIN Board ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท\
ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท\
ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท\
ยทยทยทยทยทยทยทยทยทยทยท 13
3-10. AMP Board ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท\
ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท\
ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท\
ยทยทยทยทยทยทยทยทยทยทยท 13
3-11. BD80A Board ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท\
ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท\
ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท\
ยทยทยทยทยทยทยท 14
3-12. CONNECT Board ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท\
ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท\
ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท\
ยท 14
3-13. DRIVER Board, SW Board ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท\
ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท\
ยทยทยทยท 15
3-14. Optical Pick-up (KSM-213DCP/Z-NP) ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท\
ยทยทยทยท 15
3-15. SENSOR Board ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท\
ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท\
ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท\
ยทยทยทยท 16
3-16. MOTOR (TB) Board ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท\
ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท\
ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท 16
3-17. MOTOR (LD) Board ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท\
ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท\
ยทยทยทยทยทยทยทยทยทยทยทยทยทยท 17
4. TEST MODE ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท\
ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท\
ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท\
ยทยทยทยทยทยทยทยทยทยทยทยทยทยท 18
5. DIAGRAMS
5-1. Block Diagrams - PANEL Section - ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท\
ยทยทยทยทยทยทยทยทยทยท 22 - MAIN Section - ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท\
ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท\
ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท\
ยท 23
- BD/DRIVER Section - ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท\
ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท\
ยทยทยทยทยทยทยทยท 24
5-2. Printed Wiring Board - BD80A Section - ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท\
ยทยท 25
5-3. Schematic Diagram - BD80A Section - ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท\
ยทยทยทยท 26
5-4. Printed Wiring Board - CD MECHANISM Section - ยท 27
5-5. Schematic Diagram - CD MECHANISM Section - ยทยทยทยท 28
5-6. Printed Wiring Board - MAIN Section - ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท\
ยทยทยท 29
5-7. Schematic Diagram - MAIN Section (1/2) - ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท 30
5-8. Schematic Diagram - MAIN Section (2/2) - ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท 31
5-9. Printed Wiring Board - PANEL COMB Section - ยทยทยทยทยทยทยท 32
5-10. Schematic Diagram - PANEL COMB Section - ยทยทยทยทยทยทยท 33
5-11. Printed Wiring Board - PANEL Section - ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท\
34
5-12. Schematic Diagram - PANEL Section (1/2) - ยทยทยทยทยทยทยทยทยทยทยท 35
5-13. Schematic Diagram - PANEL Section (2/2) - ยทยทยทยทยทยทยทยทยทยทยท 36
5-14. Printed Wiring Board - TRANS Section - ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท 37
5-15. Printed Wiring Board - AMP Section - ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท\
ยทยทยทยท 38
5-16. Schematic Diagram - AMP POWER Section - ยทยทยทยทยทยทยทยทยท 39
5-17. IC Pin Function Description ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท\
ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท\
ยทยทยท 41
6. EXPLODED VIEWS
6-1. MAIN Section ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท\
ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท\
ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท\
ยทยทยทยทยทยทยทยทยท 46
6-2. Front Panel Section ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท\
ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท\
ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท\
ยท 47
6-3. MAIN Board Section ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท\
ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท\
ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท 48
6-4. CD Mechanism Deck Section -1 (CDM74-K6BD80) ยทยท 49
6-4. CD Mechanism Deck Section -2 (CDM74-K6BD80) ยทยท 50
7. ELECTRICAL PARTS LIST ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท\
ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท\
ยทยทยท 51