Sony Dream Machine ICF-C113, Руководство по обслуживанию

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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.
TABLE OF CONTENTS
Specifications ........................................................................... 1
1. GENERAL
Location and Function of Controls .................................... 3
2. DISASSEMBLY
2-1. Cabinet (Upper), Front Panel Assy Removal ............. 4
3-2. Key Board, Main Board,
Power Transfomer Removal ...................................... 4
3. ELECTRICAL ADJUSTMENT
................................. 5
4. DIAGRAMS
4-1. Explanation of IC Terminals ....................................... 8
4-2. Printed Wiring Boards (ICF-C113/C113V) ................ 9
4-3. Schematic Diagram (ICF-C113/C113V) ................... 11
4-4. Printed Wiring Boards (ICF-C113L) ........................ 13
4-5. Schematic Diagram (ICF-C113L) ............................ 15
5. EXPLODED VIEW
...................................................... 18
6. ELECTRICAL PARTS LIST
.................................... 20
US model : AC : 120V
⁄
60Hz 5W
AEP, UK, Italian, E, Swiss,
Australian model
: AC : 220 – 230V
⁄
50Hz 5W
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.
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 0.5mA (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
VOMor battery-operated AC voltmeter. The “limit” indica-
tion 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)
MODEL NO.
MODEL IDENTIFICATION
– Model Number Portion –
Carved on lower cabinet
ICF-C113
ICF-C113L
ICF-C113V
• HOW TO CHANGE THE CERAMIC FILTERS
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 changed two pieces together
since it’s supply two pieces in in package as a spare parts.
AC
voltmeter
(0.75V)
To Exposed Metal
Parts on Set
Earth Ground
0.15
µ
F
1.5k
Ω
Fig. A. Using an AC voltmeter to check AC leakage.
mark
mark
CF3 CF2
red 10.70MHz
blue 10.67MHz
orange 10.73MHz
black 10.64MHz
white 10.76MHz
Mark
Center
frequency