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10.2. DVD/CD Laser Diode current measurement
This section will illustrate proceddures of measuring & deriving DVD/CD Laser Diode Current.
DVD Laser Diode Current Measurement
CD Laser Diode Current Measurement
Checking Item/Formula
Remarks
Item Description
1. Measurement the voltage (V
CD
) on the testpoints ) & CL8531(-).
This is voltage across R8566 which has a resistance value of 4.7 ohm.
2. Calculate the CD Laser current by the following formula:
CD_LD=VCD/4.7
1. Measurement the voltage (V
DVD
) on the testpoints ) & CL8532(-).
This is voltage across R8556 which has a resistance value of 4.7 ohm.
2. Calculate the DVD Laser current by the following formula:
DVD_LD=VCD/4.7
Refer to 10.2.1.
Backend P.C.B.
(Fig. 3. Backend
P.C.B.)
Refer to 10.2.1.
Backend P.C.B.
(Fig. 3. Backend
P.C.B.)
3. Specification for CD laser current is
58 mA
3. Specification for DVD laser current is
58 mA
Содержание SA-XH20PH
Страница 13: ...13 4 1 Others Licences ...
Страница 14: ...14 5 General Introduction 5 1 Power Saving Features ...
Страница 15: ...15 5 2 Disc Information 5 2 1 Media that can be played ...
Страница 16: ...16 5 2 2 File Extension Type Support MP3 JPEG DivX ...
Страница 17: ...17 5 3 DivX Information ...
Страница 18: ...18 6 Location of Controls and Components 6 1 Remote Control Key Button Operations ...
Страница 19: ...19 6 2 Main Unit Key Button Operations ...
Страница 21: ...21 7 2 Radio Antenna Connection ...
Страница 23: ...23 3 Gently pull out the tray 4 Remove the disc ...
Страница 47: ...47 12 3 Main Components and P C B Locations ...
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