Recently I bought a used HP 54520A oscilloscope. I updated to latest firmware T3.33 and then attempted to do self calibration. After following all the steps as indicating by the service manual logic trigger failed to calibrate. All other calibration PASSED. In addition to this all self tests pass fine. Usually I am getting 0xFC return error code for logic trigger calibration. But I have seen 0xCC, 0xDC and 0xEC. Now, these error codes are not documented in the service manual. I would like to learn what might be the cause for logic trigger calibration failure. Troubleshooting section of the service manual states that it might be channel attenuator or main board which is pretty broad.
In connection with the above error codes I also looked into the provided firmware. I learned that ROM and SYSTEM files are LIF files containing WS_FILE of 0xC30C and 0xC30D file types respectively. I am wondering what these file types are (I couldn't find any resource regarding on the Internet)? I am looking for header definition basically.
Thanks
In connection with the above error codes I also looked into the provided firmware. I learned that ROM and SYSTEM files are LIF files containing WS_FILE of 0xC30C and 0xC30D file types respectively. I am wondering what these file types are (I couldn't find any resource regarding on the Internet)? I am looking for header definition basically.
Thanks
I also swapped attenuator/acquisition hybrid on channel 1 with the ones from channel 2. The logic trigger calibration failed with same error code as indicated in the original/first post (0xFC). So far everything points to the main board. What element might be related to this calibration issue? In other words is this problem repairable at all?
Thanks