HP 5334A Error 5.2 & “OFL” Message

This unit arrived with a “error 5.2” displaying upon startup. In the service manual that error is described as “HP-IB address cannot be recalled at power-up”. HP-IB is Hewlett-Packards flavor of GPIB, or General Purpose Interface Bus. I suspected this was caused by the internal battery, likely the original, being dead. I was able to change out that battery and clear this error.

The second fault this unit exhibited was an intermittent message on the display, “OFL”. There is no mention of this message in the service manual anywhere and I’ve been unsuccessful in determining it’s meaning or cause. If you have any information, please reach out!