Bang & Olufsen DVD 1 MKII, Руководство по ремонту сервисного центра

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1.6 1.7
No picture
DVD mechanism failure
DVD main board failure
AV Board failure
Power supply failure
Refer to wiring diagram for point of measurement.
1. Check Video signal on selected output.
RGB AV connector
CVBS Video
YC S-Video
2. Check Video signal, RGB or YC on input to AV Board.
R, G, B and Y, C
3. Check power supply to DVD Main board
RGB OK and CVBS failure.
Video buffer on AV Board defect – Replace PCB2, AV Board.
Power supply check
SMPS output
Supply power for DVD main board and mechanism.
2P15
Sound
DVD or CD sound
The DVD Main Board delivers a digital audio signal to the AV Board.
Analog audio signal are measured on the output sockets.
Play DVD/CD
1. Check Audio signal on selected output
Line out R / L, AV or DIG. OUT.
2. Check power supply to DVD Main Board.
Display/Keyboard
Refer to wiring diagram for measuring points.
1. Check +5V supply.
2. Check for activity on KCLK_Display, KDATA_Display and CS_Display.
3. Check function of keys, shift to low voltage when activated.
Loader/Tray
Mechanical failure
No power from AV Board
1P5 pin 1 LOADER_MOTOR - 3.6V open
1P5 pin 2 LOADE 3.6V close
No function
Check power supply.
Repair Tips, English