Sony ICFCD-820 Service manual
ICF-CD820/CD820L
SERVICE MANUAL
SPECIFICATIONS
US Model
Canadian Model
E Model
Australian Model
ICF-CD820
AEP Model
ICF-CD820/CD820L
UK Model
ICF-CD820L
Model Name Using Similar Mechanism CFD-550
Optical Device Name KSM-213BAN
Optical Pick-UP Name KSS-213B
MICROFILM
CD CLOCK RADIO
SECTION 1
3
W
SERVICING NOTES
TABLE OF CONTENTS
1. SERVICING NOTES............................................... 2
2. GENERAL ................................................................. 4
3. DISASSEMBLY ......................................................... 6
4. ELECTRICAL ADJUSTMENTS
Tuner Section .................................................................. 9
CD Section ...................................................................... 11
5. DIAGRAMS
5-1. Printed Wiring Boards .................................................... 15
5-2. Schematic Diagram ......................................................... 19
5-3. IC Pin Function Description ........................................... 29
6. EXPLODED VIEWS ................................................ 31
7. ELECTRICAL PARTS LIST ............................... 34
MODEL IDENTIFICATION
ICF-CD820/CD820L
S
US, Canadian models: AC: 120 V 60 Hz 15
Other models: AC: 220 – 230 V 50 Hz 15 W
• HOW TO CHANGED THE CERAMIC FILTERS
This model is used two ceramic filters of CF2, 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 one package as a spare parts.
mark
CF2
mark
MODEL NO.
MADE IN MALAYSIA
CF
mark
center
frequency
red 10.70 MHz
blue 10.67 MHz
orange 10.73 MHz
black 10.64 MHz
white 10.76 MHz
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 MANU AL OR IN SUPPLEMENTS PUBLISHED BY SONY.
ATTENTION AU COMPOSANT AYANT RAPPORT
À LA SÉCURITÉ!
LES COMPOSANTS IDENTIFIÉS P AR UNE MARQUE !
SUR LES DIAGRAMMES SCHÉMATIQUES ET LA LISTE
DES PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ
DE FONCTIONNEMENT. NE REMPLACER CES COM-
– 2 –
POSANTS QUE PAR DES PIÈCES SONY DONT LES
NUMÉROS SONT DONNÉS DANS CE MANUEL OU
DANS LES SUPPLÉMENTS PUBLIÉS PAR SONY.
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.
1. A commercial leakage tester, such as the Simpson 229 or RCA
WT -540A. Follo w 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 lowvoltage 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 A C range are suitable. (See Fig. A)
To Exposed Metal
Parts on Set
NOTES ON HANDLING THE OPTICAL PICK-UP
BLOCK OR BASE UNIT
The laser diode in the optical pick-up block may suffer electrostatic break-down because of the potential difference generated
by the charged electrostatic load, etc. on clothing and the human
body.
During repair, pay attention to electrostatic break-down and also
use the procedure in the printed matter which is included in the
repair parts.
The flexible board is easily damaged and should be handled with
care.
NOTES ON LASER DIODE EMISSION CHECK
The laser beam on this model is concentrated so as to be focused
on the disc reflective surface by the objective lens in the optical
pick-up block. Therefore, when checking the laser diode emission, observe from more than 30 cm away from the objective lens.
CHUCK PLATE JIG ON REPAIRING
On repairing CD section, playing a disc without the CD lid, use
Chuck Plate Jig.
• Code number of Chuck Plate Jig: X-4918-255-1
1.5 k
0.15 µF
Fig. A. Using an AC voltmeter to check AC leakage.
Ω
Earth Ground
AC
voltmeter
(0.75 V)
Note on chip component replacement
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be dam-
aged by heat.
This Compact Disc player is classified as a CLASS 1
LASER product.
The CLASS 1 LASER PRODUCT label is located on the
bottom exterior.
CAUTION
Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous radiation exposure.
– 3 –
SECTION 2
GENERAL
LASER DIODE AND FOCUS SEARCH
OPERATION CHECK
1. Open the CD lid.
2. Turn on S420 as following figure.
3. Confirm that the laser diode emission while observing the objecting lens. When there is no emission, Auto Power Control
circuit or Optical Pick-up is broken.
Objective lens moves up and down once for the focus search.
Insert a precision
screwdriver and
push S420.
laser diode
emission
This section is extracted from
instruction manual.
– 4 –
– 5 –
DISASSEMBLY
• This set can be disassembled in the order shown below.
SECTION 3
SET
Note: Follow the disassembly procedure in the numerical order given.
UPPER CABINET
ASS’Y
UPPER CABINET ASS’Y
2
Open the CD lid ass’y.
CD LID ASS’Y
MAIN BOARD AND OPTICAL PICK-UP SECTION
DIAL POINTER SETTING
1
screw (P3 × 14)
3
5
flat cable
(CNP401)
3
screw (P3 × 14)
two screws
×
14)
(P3
4
upper cabinet ass’y
6
connector (CNP301)
(CD820: US, Canadian)
6
3
three screws
×
14)
(P3
connector (CNP302)
(except CD820: US, Canadian)
– 6 –
CD LID ASS’Y
)
1
Open the CD lid ass’y.
2
CD lid spring
5
CD lid ass’y
3
left hinge plate
4
right hinge plate
MAIN BOARD AND OPTICAL PICK-UP SECTION
3
screw
(BTP3 × 10)
2
lead wire
(CN901)
4
screw
(PTP3 × 14)
8
!¡
connector
(CNP502)
claw
1
switch board
9
3
optical pick-up section
screw
(BTP3 × 10)
0
flat cable (CNP501)
7
screw
(P3 × 14)
3
three screws
(BTP3 × 10)
6
main board
5
connector (CNP303
(except CD820:
US, Canadian)
– 7 –
DIAL POINTER SETTING
Note: Follow the assembly procedure in the numerical order given.
4
Set the MAIN board.
A
CV1
3
Turn the shaft CV1 to
the arrow direction from
the pattern side perfectly
(Fig. 3).
(Fig. 3)
2
Fit A portion and fit a claw to
the hole of axle side and catch
in to pointer gear (Fig. 2).
pointer
claw
(Fig. 2)
pointer
(Fig. 1)
Set the pointer at the marker
1
line (Fig. 1).
marker
– 8 –
SECTION 4
r
ELECTRICAL ADJUSTMENTS
PRECAUTION
• Adjustment should be performed in the order given.
TUNER SECTION 0 dB=1 µV
[FM]
Setting:
Function switch : RADIO
BAND switch : FM
FM RF SSG
0.01 µF
22.5 kHz frequency deviation
by 400 Hz signal.
Output level: as low as possible
FM lead wire antenna terminal
[AM (MW) /LW]
Setting:
Function switch : RADIO
BAND switch : MW/LW
AM RF SSG
30% amplitude modulation by
400 Hz signal.
Output level: as low as possible
4
set
speaker terminal
• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter
L3 87.5 MHz
CT2 108.0 MHz
Put the lead-wire
antenna close to
the set.
level mete
Ω
+
–
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter
T1 455 kHz
AM (MW) FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter
CT4 1,605 kHz [1,606.5 kHz]
AM (MW) TRACKING ADJUSTMENT
L1 (CD820)
L1-1 (CD820L: AEP, UK)
CT3 1,400 kHz [1,399.5 kHz]
LW FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter
CT4 240 kHz
Adjust for a maximum reading on level meter
L1-1 160 kHz
CT3 240 kHz
LW FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter
CT6 145 kHz
Adjust for a maximum reading on level meter
L1-2 160 kHz
CT5 240 kHz
NOTE:
[ ] : Italian model
• Abbreviation
FR : French model
(Except CD820L: FR)
L4 530 kHz [526.5 kHz]
(Except CD820L: FR)
Adjust for a maximum reading on level meter
600 kHz [598.5 kHz]
(CD820L: FR)
L4 160 kHz
LW TRA CKING ADJUSTMENT
(CD820L: FR)
(CD820L: AEP, UK)
LW TRA CKING ADJUSTMENT
(CD820L:AEP, UK)
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L2 87.5 MHz
CT1 108.0 MHz
– 9 –
FM STEREO Adjustment
d
Procedure:
FM RF SSG
0.01 µF
Carrier frequency: 98 MHz
Modulation: no modulation
Output level: 0.032 V (90 dB)
FM lead wire antenna terminal
’‘
1. Connect the frequency counter to 4 and 7 pins of IC1 as
shown the figure right.
2. Tune the set to 98 MHz.
3. Adjust RV1 for 76 kHz ± 500 Hz reading on frequenc y counter.
Adjustment Location:
RV1
FM Stereo Adjustment (76 kHz)
[MAIN Board] (Component Side)
Connection:
frequency counter
T1
AM IF Adjustment
Ω
MAIN Boar
IC1 Pin
7
IC1 Pin
4
33 k
+
–
L3 (Italian)
FM Frequency Coverage
Adjustment
CT6 (CD820L: AEP, UK)
LW Frequency Coverage Adjustment
L3 (Except Italian)
CT2
L1-2 (CD820L: AEP, UK)
LW Tracking Adjustment
L2
CT1
CT3
L1
L1-1
CT5 (CD820L: AEP, UK)
L4
(CD820L: AEP, UK):
AM (MW) Frequncy Coverage Adjustment
(CD820L: FR):
LW Frequency Coverage Adjustment
CT4
LW Tracking Adjustment
FM Tracking
Adjustment
(Except CD820L: FR):
AM (MW) Tracking
Adjustment
(CD820L: FR):
LW Tracking Adjustment
– 10 –
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