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SONY D181
Service Manual


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  • Contains Circuit Diagrams
  • Download
  • PDF Format
  • Complete manual
  • Language: English
Price: $4.99

Description of SONY D181 Service Manual

Complete service manual in digital format (PDF File). Service manuals usually contains circuit diagrams, printed circuit boards, repair tips, wiring diagrams, block diagrams and parts list. Service Manual ( sometimes called Repair Manual ) is used mainly by technicians.

If You just want to know how to use Your tv, video, mp3 player etc. You should look for Owner's Manual. After placing order we'll send You download instructions on Your email address.

The manual is available in languages: English

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Text excerpt from page 3 (click to view)
Precautions for Checking Emission of Laser Diode Laser light of the equipment is focused by the object lens in the optical pick-up so that the light focuses on the reflection surface of the disc. Therefore, be sure to keep your eyes more then 30cm apart from the object lens when you check the emission of laser diode. Laser Diode Checking Methods During normal operation of the equipment, emission of the laser diode is prohibited unless the upper panel is closed while turning ON the S801 (push switch type). The following two checking methods for the laser diode are operable. Method-1 (In the service mode or normal operation) : Emission of the laser diode is visually checked. 1. Open the upper lid. 2. Push the S801 as shown in Fig. 1 . 3. Check the object lens for confirming normal emission of the laser diode. If not emitting, there is a trouble in the automatic power control circuit or the optical pick-up. During normal operation, the laser diode is turned ON about 2.5 seconds for focus searching.

6. Check that the current value is within the following range. +5 • Current value of the label -11 mA(25°C) Variation by temperature : 0.4mA / °C Current increases with temperature increased. Current decreases with temperature decreased. If the current is more than the range above, there is a trouble in the automatic power control circuit or the laser diode is in deterioration. If less than the range, a trouble exists in the automatic power control circuit or the optical pick-up.

[MAIN BOARD] (Conductor side)

S801

Fig.1 Method to push S801
Method-2 (In the service mode or normal operation) : Check the value of current flowing in the laser diode. 1. Remove the upper panel. 2. Read the current printed on the rear side of the optical pick-up. (Print on the rear side of the optical pick-up)
AC2211397 current value A : less than 48 mA year month date shift No. line No. version

digital voltmeter TP506 TP547

TP547

IC501

3. Connect a level meter as shown in Fig. 2 4. Press the ^ key. 5. Calculate the current value by the reading of the digital voltmeter Reading of the tester (V) ÷ 4.7 ( Ω ) = current value (A) (Example) Reading of the digital voltmeter of 0.2256 V : 0.2256 V ÷ 4.7 Ω = 0.048 (A) = 48 mA

TP506

Fig. 2 Digital Voltmeter Connecting Location

–3–

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