Сервисный мануал источника звука Sony ICF-CD873

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Center frequency
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 orderto meet same specifications.Therefore, the ceramic filter must changed two pieces togethersince 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 generatedby the charged electrostatic load, etc. on clothing and the humanbody.During repair, pay attention to electrostatic break-down and alsouse the procedure in the printed matter which is included in therepair parts.The flexible board is easily damaged and should be handled withcare.
NOTES ON LASER DIODE EMISSION CHECK
The laser beam on this model is concentrated so as to be focusedon the disc reflective surface by the objective lens in the opticalpick-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-UPBLOCK 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 ­
MODEL NO. ICF-CD873
MADE IN MALAYSIA
US, Canadian models: AC: 120 V 60 Hz 20 WOther models: AC: 220 ­ 230 V 50 Hz 20 W
Insert a precision screwdriver and push S424.
laser diode emission
LASER DIODE AND FOCUS SEARCH OPERATIONCHECK
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 Controlcircuit 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, useChuck Plate Jig.· Code number of Chuck Plate Jig: X-4918-255-1