I just downloaded the latest firmware upgrade (2.7.1a) for my U1604A. I hadn't used my scope in several months, so when I first got it out of the case it would not power up because the battery was discharged. I attached the AC adapter, let the scope charge for a several minutes, and then successfully upgraded the firmware.
Now I notice that although everything works and the scope passes self cal, the real-time clock is frozen. When I try to update the clock settings in the Utility menu I can use the F2 soft key to select the field to update, but turning the rotary **** does nothing and the F3 soft key window is blank instead of displaying the time/date.
Is there some sort of clock keep-alive battery inside the scope that can be replaced, or a supercap that may have discharged and now needs to charge for a while?
Any suggestions appreciated!
Thanks,
Stan
Now I notice that although everything works and the scope passes self cal, the real-time clock is frozen. When I try to update the clock settings in the Utility menu I can use the F2 soft key to select the field to update, but turning the rotary **** does nothing and the F3 soft key window is blank instead of displaying the time/date.
Is there some sort of clock keep-alive battery inside the scope that can be replaced, or a supercap that may have discharged and now needs to charge for a while?
Any suggestions appreciated!
Thanks,
Stan
BTW, there was no mention of this backup battery in the service manual or in any other documentation I could find.
While I had the scope apart, I used the opportunity to clean the LCD and the inside of the clear plastic display cover. Now the scope both works and looks like new. I hope my experience will help someone else with a similar problem.
I own the same osciloscope and after a firmware update to the latest 2.7.1b all the functions works fine but channel 2. I want to downgrade the firmware back to 2.6.1 but I can't find it. Where can I find it?
Any idea?
You might try restoring factory defaults (under the SAVE/RECALL menu) to see if that changes anything.
Since your scope is just about as old as mine, you may also have a discharged backup battery, although my problems were only with the real-time clock, not with the scope and/or DMM functions. You can replace the battery yourself as long as you feel comfortable disassembling your scope. It's not difficult, just a little tedious, and you need to be careful about alignment of the inter-board connectors and of the rotary knob when you reassemble it.
It seems odd to me that a bad backup battery would manifest itself as scope or DMM errors, but changing the battery would be a very low-cost and low-risk attempt to fix your scope.