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Extracted text from sony icf cd 830 l service manual (Ocr-read)
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ICF-CD830/CD830L
TABLE OF CONTENTS
1. GENERAL
········································································ 4
2. DISASSEMBLY
2-1. UPPER CASE ······························································· 5
2-2. KEY BOARD ································································ 5
2-3. TRANSFORMER BOARD ··········································· 6
2-4. MAIN CHASSIS ··························································· 6
2-5. OPTICAL PICK-UP BLOCK (KSM-213CDM) ·········· 6
3. TEST MODE······························································· 7
4. ELECTRICAL ADJUSTMENTS····························· 9
5. DIAGRAMS
5-1. CIRCUIT BOARDS LOCATION ······························· 10
5-2. BLOCK DIAGRAM (CD830) ···································· 11
5-3. BLOCK DIAGRAM (CD830L) ·································· 12
5-4. SCHEMATIC DIAGRAM
-“ TUNER SECTION (CD830) -“ ································· 13
5-5. SCHEMATIC DIAGRAM
-“ TUNER SECTION (CD830L) -“ ······························ 14
5-6. SCHEMATIC DIAGRAM
-“ CD SECTION -“ ······················································· 15
5-7. SCHEMATIC DIAGRAM
-“ POWER SECTION -“ ··············································· 16
5-8. PRINTED WIRING BOARD
-“ MAIN SECTION -“ ·················································· 17
5-9. PRINTED WIRING BOARD
-“ KEY/POWER SECTION -“ ······································ 18
5-10. SCHEMATIC DIAGRAM
-“ KEY SECTION -“ ····················································· 19
5-11. IC BLOCK DIAGRAMS ············································ 20
5-12. IC PIN FUNCTION DESCRIPTION ························· 22
6. EXPLODED VIEWS
6-1. CABINET SECTION ·················································· 23
6-2. CHASSIS SECTION ··················································· 24
6-3. OPTICAL PICK-UP SECTION
(KSM-213CDM) ························································· 25
7. ELECTRICAL PARTS LIST································· 26
ATTENTION AU COMPOSANT AYANT RAPPORT
Ã- LA SÉCURITÉ!
LES COMPOSANTS IDENTIFIÉS PAR UNE MARQUE ! SUR
LES DIAGRAMMES SCHÉMATIQUES ET LA LISTE DES
PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ DE
FONCTIONNEMENT. NE REMPLACER CES COM- POSANTS
QUE PAR DES PIÈCES SONY DONT LES NUMÉROS SONT
DONNÉS DANS CE MANUEL OU DANS LES SUPPLÉMENTS
PUBLIÉS PAR SONY.SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK ! OR DOTTED LINE
WITH MARK ! 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.
SAFETY CHECK-OUT
After correcting the original service problem, perform the following
safety check before releasing the set to the customer:
Check the antenna terminals, metal trim, metallized knobs, screws,
and all other exposed metal parts for AC leakage.
Check leakage as described below.
LEAKAGE TEST
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 microampers.).
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 2 V AC range are suitable. (See Fig. A)
Fig. A. Using an AC voltmeter to check AC leakage.
Note on chip component replacement
- Never reuse a disconnected chip component.
- Notice that the minus side of a tantalum capacitor may be dam-
aged by heat.
1.5 k -„¦ 0.15 µF AC
voltmete r (0.75 V) To Exposed Metal
Parts on Set
Earth Ground
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ICF-CD830/CD830L
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.NOTES ON HANDLING THE OPTICAL PICK-UP
BLOCK OR BASE UNIT
CAUTION
Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous
radiation exposure.
This Compact Disc player is classified as a CLASS 1
LASER product.
The CLASS 1 LASER PRODUCT label is located on the
bottom exterior.
CHUCK PLATE JIG ON REPAIRING
On repairing CD section, playing a disc without the CD lid, use
Chuck Plate Jig.
-Code number of Chuck Plate Jig: X-4918-255-1
LASER DIODE AND FOCUS SEARCH
OPERATION CHECK
1. Open the CD lid.
2. Turn on S401 as following figure.
3. Confirm that the laser diode emission while observing the
objecting lens. When there is no emission, Auto Power Control
circuit or Optical Pick-up is broken.
Objective lens moves up and down once for the focus search.
Insert a precision
screwdriver and
push S401
laser diode
emission