Sega CD (Model 1) Troubleshooting Guide: Difference between revisions
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=== Power LED & Startup Symptoms === | === Power LED & Startup Symptoms === | ||
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! Symptom !! Likely Cause !! Action | ! Symptom !! Likely Cause !! Action | ||
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=== Voltage Test Points === | === Voltage Test Points === | ||
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! Test Point !! Expected Voltage !! Notes | ! Test Point !! Expected Voltage !! Notes | ||
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The Sega CD Model 1 does not output video directly; all video passes through the Mega Drive. However, certain faults manifest as display or audio anomalies at boot. | The Sega CD Model 1 does not output video directly; all video passes through the Mega Drive. However, certain faults manifest as display or audio anomalies at boot. | ||
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! Symptom !! Possible Cause !! Suggested Action | ! Symptom !! Possible Cause !! Suggested Action | ||
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=== Common CD Drive Symptoms === | === Common CD Drive Symptoms === | ||
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! Symptom !! Likely Cause !! Action | ! Symptom !! Likely Cause !! Action | ||
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The Sega CD Model 1 uses separate RAM for program and graphics, plus a mask ROM for BIOS. | The Sega CD Model 1 uses separate RAM for program and graphics, plus a mask ROM for BIOS. | ||
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! Symptom !! Suspect IC(s) !! Resolution | ! Symptom !! Suspect IC(s) !! Resolution | ||
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== ⚠️ Connector & Socket Issues == | == ⚠️ Connector & Socket Issues == | ||
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! Location !! Problem !! Fix | ! Location !! Problem !! Fix | ||
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=== Key Test Points === | === Key Test Points === | ||
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! Signal/Part !! Expected Value !! Notes | ! Signal/Part !! Expected Value !! Notes | ||
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Audio is mixed from both the Mega Drive and Sega CD. Model 1 units use a mixing cable between headphone out (Mega Drive) and "Mix In" (Sega CD). | Audio is mixed from both the Mega Drive and Sega CD. Model 1 units use a mixing cable between headphone out (Mega Drive) and "Mix In" (Sega CD). | ||
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! Symptom !! Likely Cause !! Action | ! Symptom !! Likely Cause !! Action | ||
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== 📎 Related Pages == | == 📎 Related Pages == | ||
* [[Sega CD Laser & Drive Maintenance]] | * [[Sega CD Laser & Drive Maintenance]] | ||
* [[Mega Drive / Genesis Troubleshooting]] | * [[Sega Mega Drive / Genesis (Model 1) Troubleshooting Guide|Mega Drive / Genesis Troubleshooting]] | ||
* [[Sega CD Capacitor Replacement Guide]] | * [[Sega CD Capacitor Replacement Guide]] | ||
[[Category:Sega Systems]] | [[Category:Sega Systems]] | ||
[[Category:Sega Troubleshooting Guides]] | [[Category:Sega Troubleshooting Guides]] | ||