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File name DVD2015 ROADSTAR.pdf

R DVD-2015H-2045H Service Manual -DVD-2015H-2045H DVD Player Service Manual Table of Content Table of Content...2 Precaution...3 Chapter 1. Power and Grounding Check ...3 Chapter 2. Check on the Dolby Digital Interface ...5 Chapter 3. Check on the RCA Audio Interface ...6 Chapter 4. Check on the Composite and Component Video Interface ...7 Chapter 5. Check on the SCART/YUV Interface (Optional) ...8 Chapter 6. Check on the Front Panel...11 Chapter 7. Check on the Servo Interface ...12 Chapter 8. Check on the Loader ...13 Chapter 9. Check on the MPEG Decoding Unit...14 2 Precaution Unless specified, the checking procedure should always be conducted in the status of :1. POWER ON. 2. NO DISC IN THE LOADER. 3. DISC DETECTION PROCESS IS FINISHED AND "NO DISC" MESSAGE INDICATED ON THE TOP LEFT HAND CORNER ON THE SCREEN AND ON THE VFD. 4. Pin assignment of any chip please refers to the attached datasheets. 5. All the measurement, unless specified, are measured using Digital Multi-Meter. Chapter 1. Power and Grounding Check Procedure 1.1 During Power On, J11 should have the voltages appear as indicated below : Pin No. 1 2 3 4 5 6 7 8 9 Intput component R218 R220 R217 R219 FB30 FB3 FB36 Voltage +12V -12V 0V +5V +5V 0V 0V 2.5V If not, please turn off the Power and disconnect J11. Power On again and check on J1 cable side for the voltage listed above. If there are no voltage (except pin 9) appears on the J1 cable, it is the Power supply problem. Please replace with a new power supply. Besides, checking J11, one can also check the Ferrite Bead or resistor just beside for the Power supply to the MPEG Board connectivity. Part no. of the Ferrite Beads are shown in the above table. 1.2 U10 AIC1117-3.3 should have voltage output shown as the table below : Pin 1 2 3 4 Figure 1-1 Voltage GND +3.3V +5V +3.3V 1 4 2 3 Pin 3 are the supply voltage for 3.3V generation. If J11-Pin 5 have +5V supply but Pin3 of U10 do not, please check the Ferrite Bead