Read Sony ICF-C620 Service Manual online
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TABLE OF CONTENTS
1. SERVICE NOTE
...............................................................
2
2. GENERAL
..........................................................................
3
3. DISASSEMBLY
3-1. Cabinet (Rear) Assy ........................................................... 4
3-2. Power Transformer ............................................................. 4
3-3. Main Board ......................................................................... 5
3-4. Lid (Cassette) ..................................................................... 6
3-5. Machanism Deck Assy ....................................................... 6
3-6. Pointer Setting .................................................................... 7
3-2. Power Transformer ............................................................. 4
3-3. Main Board ......................................................................... 5
3-4. Lid (Cassette) ..................................................................... 6
3-5. Machanism Deck Assy ....................................................... 6
3-6. Pointer Setting .................................................................... 7
4. MECHANICAL ADJUSTMENTS
................................
8
5. ELECTRICAL ADJUSTMENTS
5-1. Tape Recoder Section ......................................................... 8
5-2. Radio Section ..................................................................... 9
5-2. Radio Section ..................................................................... 9
6. DIAGRAMS
6-1. Printed Wiring Boards ...................................................... 10
6-2. Schematic Diagram .......................................................... 13
6-2. Schematic Diagram .......................................................... 13
7. EXPLODED VIEWS
7-1. Rear Cabinet Section ........................................................ 16
7-2. Front Cabinet Section ....................................................... 17
7-3. Mechanism Deck Section ................................................. 18
7-2. Front Cabinet Section ....................................................... 17
7-3. Mechanism Deck Section ................................................. 18
8. ELECTRICAL PARTS LIST
...................................
19
SAFETY CHECK-OUT (US MODEL)
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.
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 measured by any one of three methods.
1. A commercial laekage tester, such as the Simpson 229 or RCA
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 measured by any one of three methods.
1. A commercial laekage tester, such as the Simpson 229 or RCA
WT-540A. Follow the manufacturers’ instructions to use three
instruments.
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
0.75V, 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)
0.75V, 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)
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 COMPOSANTS QUE PAR DES PIÈCES SONY
DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU
DANS LES SUPPLÉMENTS PUBLIÉS PAR SONY.
CRITIQUES POUR LA SÉCURITÉ DE FONCTIONNEMENT. NE
REMPLACER CES COMPOSANTS QUE PAR DES PIÈCES SONY
DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU
DANS LES SUPPLÉMENTS PUBLIÉS PAR SONY.
SECTION 1
SERVICE NOTE
• SETTING THE POWER CORD
Set the power cord as illustrated below, then install the lower cabinet.
Power cord
To Exposed Metal
Parts on Set
Parts on Set
Fig. A. Using an AC voltmeter to check AC leakage.
Earth Ground
0.15µF
AC
voltmeter
(0.75V)
voltmeter
(0.75V)
1.5k
Ω
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.
REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE
PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR
IN SUPPLEMENTS PUBLISHED BY SONY.
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