Table Of Contents - Sony ICF-CD830 Service Manual

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 ·······························································
4. ELECTRICAL ADJUSTMENTS ·····························
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 ·································
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.
ATTENTION AU COMPOSANT AYANT RAPPORT
À 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.
2
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.
7
1. A commercial leakage tester, such as the Simpson 229 or RCA
WT-540A. Follow the manufacturers' instructions to use these
9
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)
0.15 µ F
Fig. A. Using an AC voltmeter to check AC leakage.
Note on chip component replacement
26
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be dam-
aged by heat.
To Exposed Metal
Parts on Set
1.5 k Ω
Earth Ground
AC
voltmeter
(0.75 V)