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Troubleshooting SRC (Scan Rate Converter)
1. Using a color bar signal generator set for channel 3 (NTSC). Tune the instrument to receive the color bar signal on channel 3. 2. Using an oscilloscope check J32201 pins 1, 3, and 5 for proper signal. 3. If correct signal proceed to step 5. 4. If signal missing troubleshoot the I/O board. 5. Check J32201 pins 9, 10, 11, 12, and 13 for proper signal. (pin 9 and 10 aprox. +8V) (pin 11 aprox. +12V) (pin 12 = Data signal) (pin 13 = Clock signal) 6. Any voltage/signal missing or not correct on J32201 troubleshoot I/O board. 7. Bring up Guide menu see if Gemstar OSD is present on screen. 8. OSD present replace SRC module. 9. OSD not present check for sync signals on J32202 pins 9 and 10. 10.Signals missing replace SRC. 11.Signals present check for sync signals on J32501 pins 2 and 4. 12.Signals missing replace SRC. 13.Signals present check for Y Pr Pb on J32501 pins 8, 10, and 12. 14.Signals missing replace SRC. 15.Signals present troubleshoot I/O board.