ICF-CD873 - Sony Audio Service Manual (repair manual)

icf-cd873 service manual
Model
ICF-CD873
Pages
39
Size
5.44 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
icf-cd873.pdf
Date

Read Sony ICF-CD873 Service Manual online

SERVICE MANUAL
FM/AM CD CLOCK RADIO
US Model
Canadian Model
AEP Model
Australian Model
SPECIFICATIONS
ICF-CD873
Model Name Using Similar Mechanism
CFD-550
Optical Device Name
KSM-213BAN
Optical Pick-UP Name
KSS-213B
9-927-109-12
Sony Corporation
2002K0500-1
Personal Audio Company
C
 2002.11
Published by Sony Engineering Corporation
Ver 1.3  2002.11
Incorporation of Supplement-1
(Page 43, 44, 47, 53, 54)
– 2 –
TABLE  OF  CONTENTS
1.
SERVICING  NOTE
..................................................
2
2.
GENERAL
...................................................................
4
3.
DISASSEMBLY
.........................................................
6
4.
POWER  CORD  SETTING
...................................
8
5.
ELECTRICAL  ADJUSTMENTS
.........................
9
Tuner Section ..................................................................
9
CD Section ...................................................................... 10
Main Clock Section ......................................................... 12
6.
DIAGRAMS
6-1. Block Diagram  – CD Section – ..................................... 15
6-2. Block Diagram  – TUNER Section – ............................. 17
6-3. Block Diagram  – MAIN Section – ................................ 19
6-4. Printed Wiring Board  – MAIN Section – ...................... 23
6-5. Schematic Diagram  – MAIN Section – ......................... 27
6-6. Schematic Diagram  – POWER SUPPLY Section – ...... 32
6-7. Printed Wiring Board  – POWER SUPPLY Section – ... 35
6-8. IC Pin Function Description ........................................... 41
7.
EXPLODED  VIEWS
................................................ 43
8.
ELECTRICAL  PARTS  LIST
............................... 47
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  COM-
POSANTS  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  PUB-
LISHED  BY  SONY.
CAUTION
Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous ra-
diation exposure.
SAFETY  CHECK-OUT
After correcting the original service problem, perform the follow-
ing 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. 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” indica-
tion is 0.75 V, so analog meters must have an accurate low-
voltage scale. The Simpson 250 and Sanwa SH-63Trd are ex-
amples of a passive VOM that is suitable. Nearly all battery
operated digital multimeters that have a 2 V AC range are suit-
able.  (See Fig. A)
Fig. A.
Using an AC voltmeter to check AC leakage.
1.5 k
0.15 
µ
F
AC
voltmeter
(0.75 V)
To Exposed Metal
Parts on Set
Earth Ground
SECTION  1
SERVICING  NOTES
This appliance is classified as a CLASS 1 LASER product.
The CLASS 1 LASER PRODUCT MARKING is located on
the rear exterior.
Laser component in this product is capable of emitting radiation
exceeding the limit for Class 1.
– 3 –
CF2
CF3
mark
Mark
Center frequency
red
10.70 MHz
blue
10.67 MHz
orange
10.73 MHz
black
10.64 MHz
white
10.76 MHz
HOW  TO  CHANGED  THE  CERAMIC  FILTERS
This model is used two ceramic filters of CF2 and CF3.
You must used 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 one package as a spare parts.
The laser diode in the optical pick-up block may suffer electro-
static 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 emis-
sion, observe from more than 30 cm away from the objective lens.
NOTES  ON  HANDLING  THE  OPTICAL  PICK-UP
BLOCK  OR  BASE  UNIT
Flexible Circuit Board Repairing
• Keep the temperature of the soldering iron around 270 ˚C dur-
ing repairing.
• Do not touch the soldering iron on the same conductor of the
circuit board (within 3 times).
• Be careful not to apply force on the conductor when soldering
or unsoldering.
Notes 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.
MODEL  IDENTIFICATION  – Rear View –
S
 
MODEL NO.      ICF-CD873
MADE IN MALAYSIA
US, Canadian models: AC: 120 V     60 Hz 20 W
Other models: AC: 220 – 230 V     50 Hz 20 W
Insert a precision 
screwdriver and 
push S424.
laser diode 
emission
LASER  DIODE  AND  FOCUS  SEARCH  OPERATION
CHECK
1. Open the CD lid.
2. Turn on S424 as following figure.
3. Confirm that the laser diode emission while observing the ob-
jecting 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.
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
– 4 –
SECTION  2
GENERAL
This section is extracted from
instruction manual.
Page of 39
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Download Sony ICF-CD873 Service Manual (Repair Manual)

Here you can read online and download Sony ICF-CD873 Service Manual in PDF. ICF-CD873 service manual will guide through the process and help you recover, restore, fix, disassemble and repair Sony ICF-CD873 Audio. Information contained in service manuals typically includes schematics / circuit diagrams, wiring diagrams, block diagrams, printed wiring boards, exploded views, parts list, disassembly / assembly, pcb.