Troubleshooting the Plus/4 Using an Oscilloscope - Plus/4 Encyclopedia



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Troubleshooting the Plus/4 Using an Oscilloscope
Category Hardware/Troubleshooting Topic Here you can find oscillograms for the Commodore Plus/4 (NTSC). I recorded them following the instructions from the original service manual. 1) NO VIDEO - absolutely no video on screen b) Check for oscillation at pin 14 of U1 (TED) c) Check for LUM signal at pin 23 of U1 at FB3 e) Check for control signals: AEC pin 35 of U1 CAS pin 11 of U1 Keywords oscilloscope plus/4 troubleshooting service manual