I've been looking at a used Tektronix DPO7054 as a possible new oscilloscope for the lab. Out of the box, when plugged in, several red and green LED indicators on the lower board to the far right of the unit illuminate, so I know it's getting power. According to the service manual, this is expected behaviour when the unit is in standby.
When the front power button is pressed, several relays switch on, the power light on the power button momentarily turns green, the red LED momentarily turns off, but then the unit immediately powers down. At no point do the fans power up. Once this happens, the unit remains unresponsive until the power cord is disconnected and reconnected.
The service manual has a pretty rudimentary troubleshooting guide at this point, instructing to remove boards one at a time to isolate the problem. However, if I open up the unit, I will lose the ability to return it, and replacement boards are quite expensive. At the same time, if it's something simple like a loose cable, I'd prefer not to return it without fully checking the system out.
Any suggestions for things I should try? Has anyone encountered a similar issue with their Tek 7000-series scopes?
Thanks,
David (VE7FIM)