Sony icf cd 873 l service manual
This is the 36 pages manual for sony icf cd 873 l service manual.
Read or download the pdf for free. If you want to contribute, please upload pdfs to audioservicemanuals.wetransfer.com.
Extracted text from sony icf cd 873 l service manual (Ocr-read)
Page 1
Ð 2 Ð TABLE OF CONTENTS 1. SERVICING NOTES ............................................... 3 2. GENERAL ................................................................... 4 3. DISASSEMBLY ......................................................... 5 4. POWER CORD SETTING ................................... 7 5. ELECTRICAL ADJUSTMENTS Tuner Section .................................................................. 8 CD Section ...................................................................... 9 Main Clock Section ......................................................... 11 6. DIAGRAMS 6-1. Block Diagram Ð CD Section Ð ..................................... 13 6-2. Block Diagram Ð TUNER Section Ð ............................. 15 6-3. Block Diagram Ð MAIN Section Ð ................................ 17 6-4. Printed Wiring Boards Ð MAIN Section Ð .................... 22 6-5. Schematic Diagram Ð MAIN Section Ð ......................... 25 6-6. Schematic Diagram Ð POWER SUPPLY Section Ð ...... 30 6-7. Printed Wiring Boards Ð POWER SUPPLY Section Ð ...................................... 33 6-8. IC Pin Function Description ........................................... 39 7. EXPLODED VIEWS ................................................ 41 8. ELECTRICAL PARTS LIST ............................... 45 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. 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. The following caution label is located inside the unit.
Page 2
Ð 3 Ð SECTION 1 SERVICING NOTES 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 itÕs 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 ûC 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. 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