Sony MDS-JA555ES free download

File name sony_MDS-JA555ES_service_manual.pdf

MDS-JA555ES SERVICE MANUAL US Model Canadian Model AEP Model UK Model Photo : GOLD U.S. and foreign patents licensed from Dolby Laboratories Licensing Corporation. Model Name Using Similar Mechanism MD Mechanism Type Base Unit Type Optical Pick-up Type MDS-JA20ES MDM-6A MBU-5C KMS-260B/J1N SPECIFICATIONS MiniDisc digital audio system MiniDisc Semiconductor laser (=780 nm) Emission duration : continuous Laser output Less than 44.6 µW* * This output is the value measured at a distance of 200 mm from the objective lens surface on the Optical Pick-up Block with 7 mm aperture. Laser diode properties Material: GaAlAs Revolutions (CLV) 400 rpm to 900 rpm Error correction ACIRC (Advanced Cross Interleave Reed Solomon Code) Sampling frequency 44.1 kHz Coding ATRAC (Adaptive TRansform Acoustic Coding) Modulation system EFM (Eight-to-Fourteen Modulation) Number of channels 2 stereo channels Frequency response 5 Hz to 20,000 Hz ± 0.3 dB Signal-to-noise ratio Over 105 dB during playback Wow and flutter Below measurable limit System Disc Laser Inputs Jack type LINE (ANALOG) IN DIGITAL IN OPT1 DIGITAL IN OPT2 DIGITAL IN COAXIAL Phono jacks Square optical connector jack Square optical connector jack Phono jack Input impedance Rated input Minimum input 47 k Optical wave length 660 nm Optical wave length 660 nm 500 mVrms 125 mVrms 75 0.5 Vp-p ±20% -- Continued on next page -- MINIDISC DECK MICROFILM SAFETY CHECK-OUT Output Jack type Stereo phone jacks Phono jacks Square optical connector jack Phono jack Rated output 28 mW 2 Vrms (at 50 k) ­18 dBm Load impedance 32 Over 10 k Optical Wave length 660 nm 75 PHONES LINE(ANALOG) OUT DIGITAL OUT OPTICAL After correcting the original service problem, perform the following safety checks 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 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 microamperes). 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. A battery-operated AC milliammeter. The Data Precision 245 digital multimeter is suitable for this job. 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 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) To Exposed Metal Parts on Set DIGITAL OUT COAXIAL General Power requirements 0.5 Vp-p (at 75 ) Where purchased Continnental Europe and UK U.S.A. and Canada Power requiremen