Page 1
ICF-C773/C773L
2
TABLE OF CONTENTS
Specifications ........................................................................\
.... 1
1. GENERAL
Location and Function of Controls .................................. 3
2. DISASSEMBLY
2-1. Disassembly Flow .................................................. 4
2-2 Cabinet (Lower). .................................................... 4
2-3. Power Board ........................................................... 5
2-4. Foot Sub Assy ........................................................ 5
2-5. Cabinet (Rear) Sub Assy ........................................ 6
2-6. Side Panel (L), Side Panel (R) ............................... 6
2-7. Cabinet (Front) Sub Assy ....................................... 7
2-8. Reflector (L), Reflector (R) ................................... 7
2-9. LCD Board ............................................................. 8
3-10. Main Board ............................................................ 8
3. ELECTRICAL ADJUSTMENTS ............................... 9
4. DIAGRAMS
4-1. Printed Wiring Board -“ Main section -“ .................. 11
4-2. Schematic Diagram
-“ Main Board (US/CND, IT) (1/2) section-“ ........... 12
4-3. Schematic Diagram
-“ Main Board (US/CND, IT) (2/2) section-“ ........... 13
4-4. Schematic Diagram
-“ Main Board (AEP/UK) (1/2) section-“ ................. 14
4-5. Schematic Diagram
-“ Main Board (AEP/UK) (2/2) section-“ ................. 15
4-6. Printed Wiring Board -“ Key, LCD Board section -“ 16
4-7. Schematic Diagram -“ Key, LCD Board section-“ .. 17
4-8. Printed Wiring Board -“ Power Board -“ ................. 18
4-9. Schematic Diagram -“ Power Board -“ .................... 19
4-10. Circuit Board Location ........................................... 20
4-11. IC Pin Function Descriptions ................................. 22
5. EXPLODED VIEW ..................................................... 23
6. ELECTRICAL PARTS LIST ................................... 25
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
PA RT NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN
SUPPLEMENTS PUBLISHED BY SONY.
- HOW TO CHANGE THE CERAMIC FILTER This model is used two ceramic filters of CF2 and CF3.
You must use same type of color marked ceramic filters in
order to meet same specifications.
Therefore, the ceramic filter must change two pieces together
since it's supply two pieces in package as a spare parts. SAFETY CHECK-OUT
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 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 2V AC range are suitable. (See
Fig. A)
Fig. A. Using an AC voltmeter to check AC leakage.
ATTENTION AU COMPOSANT AYANT RAPPORT
Ã- LA SÉCURITÉ!!
LES COMPOSANTS IDENTIFIÉS PAR UNE MARQUE 0 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.
0.15 µF To Exposed Metal
Parts on Set
1.5k-„¦ AC
voltmeter
(0.75V)
Earth Ground
mark mark
CF3
CF2
no mark
blue
orange black
white 10.70MHz
10.67MHz
10.73MHz
10.64MHz
10.76MHz
Mark
Center
frequency
