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CTC210/211 Video Troubleshooting (NTSC)
Setup for video troubleshooting: · Color Bar generator capable of multi-sync · Oscilloscope · DVM No Video (NTSC) 1. 2. 3. 4. 5. 6. 7. 8. Bring up PIP and look for PIP box. If PIP box is present, go to step 4. No PIP box, suspect U18100 circuit. Inject color bar signal on Aux1 and check for signal at U18100-51. No signal on U18100-51, check U16501 Video Switching circuit. Signal present on U18100-51 check for YC at pins 49 and 47 of U18100. If Signal missing, suspect U18100 circuit. Signal present check U16500-20 and 21. No signal at this point indicates open circuit between U18100 and U16500. 9. If Signal present check U16500-18 and 17 for YC signal. 10. No signal, suspect U16500 circuit. 11. Signal present, check U18100-3 and 5 for YC signal. No signal at this point indicates open circuit between U16500 and U18100. 12. Signal present, suspect U18100 circuit. NOTE: Video from any S-Video mode will indicate U18100 and U16500 are working. Be sure to check all inputs for signal to help eliminate working circuits.
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