Sharp md mt 831 h service manual
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Extracted text from sharp md mt 831 h service manual (Ocr-read)
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MD-MT831H/W Ð 2 Ð Precaution to be taken when replacing and servicing the laser pickup. The following precautions must be observed during servicing to protect your eyes against exposure to the laser. Warning of possible eye damage when repairing: If the AC adaptor or batteries are connected when the top houising (disc cover) of the unit is removed, and the PLAY key is pressed, the laser will light up during focus access (2-3 seconds). (Fig. 3-1) During the operation, the laser will leak from the opening between the magnetic head and the mechanical chassis (Fig. 3-2). In order to protect your eyes, you must not look at the laser during repair. Before repairing be sure to disconnect the AC adaptor and remove the batteries. Precaution to be taken when replacing and servicing the Laser Pickup. The AEL (Accessible Emission Level) of Laser Power Output for this model is specified to be lower than Class I Requirements. However, the following precautions must be observed during servicing to protect your eyes against exposure to the laser beam. (1) When the cabinet has been removed, the power is turned on without a compact disc, and the Pickup is on a position outer than the lead-in position, the Laser will light for several seconds to detect a disc. Do not look into the Pickup Lens. (2) The Laser Power Output of the Pickup inside the unit and replacement service parts have already been adjusted prior to shipping. (3) No adjustment to the Laser Power should be attempted when replacing or servicing the Pickup. (4) Under no circumstances look directly into the Pickup Lens at any time. (5) CAUTION - Use of controls or adjustments, or performance of procedures other than those specified herein may result in hazardous radiation exposure. SAFETY PRECAUTION FOR SERVICE MANUAL CAUTION Laser Diode Properties lMaterial: GaAIAs lWavelength: 785 nm lPulse time: Read mode; 0.8 mW Continuous Write mode; max. 10 mW 0.5S min. cycle 1.5S Repetition lThis Portable MiniDisc Recorder is classified as a CLASS 1 LASER product. lThe CLASS 1 LASER PRODUCT label is located on the bottom. l Use the Portable MiniDisc Recorder only in accordance with the instructions given in this manual and do not attempt to interfere with the interlock switch or make any other adjustment as this may result in exposure to hazardous radiation. LASER KLASSE 1 LUOKAN 1 LASERLAITE KLASS 1 LASERAPPARAT (MD-MD831H for U.K.) (MD-MD831H for Europe) (For MD-MD831W) VAROITUS! LAITTEEN KÄYTTÄMINEN MUULLA KUIN TÄSSÄ KÄYTTÖOHJEESSA MAINITULLA TAVALLA SAATTAA ALTISTAA KÄYTTÄJÄN TURVALLISUUSLUOKAN 1 YLITTÄVÄLLE NÄKYMÄTTÖMÄLLE LASERSÄTEILYLLE. VARNING - OM APPARATEN ANVÄNDS PÅ ANNAT SÄTT ÄN I DENNA BRUKSANVISNING SPECIFICERAS. KAN ANVÄNDAREN UTSÄTTAS FÖR OSYNLIG LASERSTRÅLNING, SOM ÖVERSKRIDER GRÄNSEN FÖR LASERKLASS 1. (MD-MD831H for Europe)
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MD-MT831H/W Ð 3 Ð FOR A COMPLETE DESCRIPTION OF THE OPERATION OF THIS UNIT, PLEASE REFER TO THE OPERATION MANUAL. SPECIFICATIONS Specifications for this model are subject to change without prior notice lThe continuous recording time is for analogue inputs when the volume level is set to VOL 0. lThe continuous play time shows the value when the volume level is set to VOL 15. lThe above values are the standard values when the unit is charged and used at an ambi- ent temperature of 20°C (68°F). lThe operating time when using an alkaline battery may be different, depending on the type and manufacturer of the battery, and on the operatin g temperature.Dimensions: Width: 79.4 mm (3-1/8") Height: 17.9 mm (11/16") Depth: 81.8 mm (3-3/16") Weight: 163 g (0.36 lbs.) with rechargeable battery Input socket: Line/optical digital, microphone (powered by the main unit) Output socket: Earphones (impedance: 32 ohms)/remote control unit nMiniDisc Recorder Type: Portable MiniDisc recorder Signal readout: Non-contact, 3-beam semi-conductor laser pick-up Audio channels: Stereo 2 channels/monaural (long-play mode) 1 channel Frequency response: 20 – 20,000 Hz (± 3 dB) Rotation speed: Approx. 400 – 1,350 rpm Error correction: ACIRC (Advanced Cross Interleave Reed- Solomon Code) Coding: ATRAC (Adaptive Transform Acoustic Coding), 24-bit computed type Recording method: Magnetic modulation overwrite method Sampling frequency: 44.1 kHz (32 kHz and 48 kHz signals are con- verted to 44.1 kHz, and then recorded.) Wow and flutter: Unmeasurable (less than ±0.001% W. peak) nGeneral Power source: DC 3.6V:Rechargeable Lithium-Ion battery x 1 DC 5.0V: AC adaptor (AC 220 - 230V, 50/ 60 Hz) [MD-MT831H for Europe] DC 3.3V:Battery case (with voltage booster) (commercially available, AA size, alkaline battery x 1) DC 4.5V: Separately available car adaptor, AD-CA20X (for cars with a 12- 24V DC negative earth electrical system) Power consumption: 7 W (AC adaptor) [MD-MT831H] Output power: RMS; 20 mW (10 mW + 10 mW) (0.2% T.H.D.)Charging time: Approx. 3 hours (When using the AC adaptor included with the unit) Battery life: When using the rechargeable battery (fully charged) included with the unit Continuous recording:Approx. 9.5 hours Continuous play:Approx. 14.5 hours When using one, commercially available, high capacity, AA size, alkaline battery (The re- chargeable battery is in the unit, discharged.) Continuous recording:Approx. 4.5 hours Continuous play:Approx. 11.5 hours When using one, commercially available, high capacity, AA size, alkaline battery with the re- chargeable battery (fully charged) Continuous recording:Approx. 14 hours Continuous play:Approx. 26 hoursOutput level: Specified outputMaximum output levelLoad impedance Earphones - 10 mW + 10 mW32 ohms LINE 250 mV (-12dB)- 10 k ohms Input sensitivity: Recording levelReference input levelInput impedance MIC H 0.25 mV 10 k ohms MIC L 2.5 mV 10 k ohms LINE 100 mV 20 k ohms DC 5.0V: AC adaptor (AC 230 - 240V, 50/ 60 Hz) [MD-MT831H for U.K.] DC 5.0V: AC adaptor (AC 110 - 240V, 50/ 60 Hz) [MD-MT831W] 0.15A (AC adaptor) [MD-MT831W] Figure 3-1 Figure 3-2 Magnet head Optical pickup Top Cabinet Magnet Head Laser Beam Optical Pickup Main PWB Spindle motor Mechanism Chassis