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MICROFILM
ICF-C390/C390L
SERVICE MANUAL
ICF-C390
FM/AM CLOCK RADIO
ICF-C390L : French model
FM/LW CLOCK RADIO
ICF-C390L : AEP, UK model
FM/MW/LW 3 BAND CLOCK RADIO
SPECIFICATIONS
US Model
Canadian Model
E Model
Australian Model
ICF-C390
UK Model
ICF-C390L
AEP Model
ICF-C390/C390L
Time display :
US, Canadian, UK, Australian model : 12-hour system
EXCEPT US, Canadian, UK, Australian model : 24-hour
system
Frequency range :
FM : 87.5­ 108 MHz
AM (MW) :530 ­ 1,605 kHz (EXCEPT French, Italian model)
AM : 526.5 ­ 1,606.5 kHz (Italian model)
LW : 153 ­ 255 kHz (ICF-C390L)
Speaker : Approx. 6.6 cm (2 5/8 inches) dia. 8 Ohms
Power output :
100 mW (at 10% harmonic distortion)
Power requirements :
120V AC, 60Hz (US, Canadian, Central & South America
model)
220 ­ 230V AC, 50Hz (EXCEPT US, Canadian, Central &
South America, E4 model)
110 ­ 120V, 220 ­ 230V AC, 50/60Hz selectable (E4 model)
For power backup : 9V DC, one 6F22 battery
Battery life :
Approx. 35 hours using the S-006P (U) battery
Dimensions :
Approx. 220 x 47.5 x 153 mm (w/h/d)
(86 3/4 x 1 7/8 x 6 1/8 inches) incl. projecting parts and controls
Mass :
UK model : Approx. 610 g (1 lb 6 oz) not incl. battery
EXCEPT UK model : Approx. 540 g (1 lb 3 oz) not incl.
battery
Design and specifications are subject to change without notice.


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­ 2 ­
TABLE OF CONTENTS
Specifications ........................................................................... 1
1. GENERAL
Location and Function of Controls .................................... 3
2. DISASSEMBLY
2-1. Cabinet (Upper) Removal ........................................... 4
2-2. Main Board Removal ................................................. 4
Installation Power Cord ..................................................... 5
3. DIAL POINTER INSTALLATION ............................ 6
4. ELECTRICAL ADJUSTMENT ................................. 7
5. DIAGRAMS
5-1. Printed Wiring Boards
(ICF-C390/C390L : French model) ........................... 9
5-2. Schematic Diagram
(ICF-C390/C390L :French model) ............................ 11
5-3. Printed Wiring Boards
(ICF-C390L :AEP, UK model) ................................. 13
5-4. Schematic Diagram
(ICF-C390L :AEP, UK model) ................................. 15
6. EXPLODED VIEW ...................................................... 17
7. ELECTRICAL PARTS LIST .................................... 19
MODEL NO.
MODEL IDENTIFICATION
­ Model Number Portion ­
Carved on lower cabinet
ICF-C390
ICF-C390L
US, Canadian, Central &
South America model
: AC : 120V
/60Hz
AEP, UK, French, Italian, Spanish,
Russian, E13 model
: AC : 220 ­ 230V
/50Hz
E4 model
: AC : 110 ­ 120V/220 ­ 230V
/ 50/60Hz
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 0.5mA (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 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)
AC
voltmeter
(0.75V)
To Exposed Metal
Parts on Set
Earth Ground
0.15
µF
1.5k
Fig. A. Using an AC voltmeter to check AC leakage.
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.
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.
·
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.
mark
mark
CF3
CF2
red
10.70MHz
blue
10.67MHz
orange
10.73MHz
black
10.64MHz
white
10.76MHz
Mark
Center
frequency


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­ 3 ­
SECTION 1
GENERAL
FREQUENCY
50Hz
60Hz
ICF-C390L : AEP, UK model
CLOCK
­ TIME SET+
ALARM
RESET/OFF SLEEP
SNOOZE / DATE / SLEEP OFF
AC power cord
FM wire antenna
ARADIO BBUZZER
ALARM
RADIO
OFF
ON
Spanish model
E4 model
@ Jack
VOLTAGE SELECTOR
110 ­ 120V
220 ­ 230V
AM
FM
BAND
TUNING
VOL
LW
FM
BAND
TUNING
VOL
ICF-C390
ICF-C390L : French model
LW MW FM
BAND
TUNING
VOL
LOCATION AND FUNCTION OF CONTROLS


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­ 4 ­
SECTION 2
DISASSEMBLY
Note : Follow the disassembly procedure in the numerical order given.
2-1. CABINET (UPPER) REMOVAL
2-2. MAIN BOARD, SECONDARY BOARD, PRIMARY BOARD REMOVAL
1 Screws (+P 3x14)
1 Screws (+P 3x14)
2 Claw
3
Cabinet (Upper)
Cabinet (lower)
1 Claws
1 Claw
2
Main board
4 Primary board
3 Secondary board


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­ 5 ­
INSTALLATION POWER CORD
US model
EXCEPT US model
power cord
6
4
5
2
3
1
6
5
4
2
3
1
power cord