Broken Display I have had this detector for a few years now, and it continues to work well for me. My problem is that the text display doesn't work. I still hear the beeps and bloops from it, but it no longer shows the band (X,Ka, etc.) or the bars to tell me how close it is. Thing is, when I press down on the top of the unit, the text appears as long as I am applying pressure. Is there a way to fix this so I don't have to press down to get a display? Any help would be greatly appreciated.

The XTR-438 has Text display (vs. the XTR-265 Icon display), filter and TFSR modes (TFSR = Traffic Flow Signal Rejection). This mode helps reduce the alarms from traffic monitoring transmitters.

There is no text display on a 1640 also this model doesn't have voice capability. Now, in order for the compass to properly function the unit does need to be calibrated. There is a sticker on the bottom of the unit that gives step by step instructions.

Texts time display is normally set by the network

There could be few reasons for this.
1. There is strong magnetic field near the radar detector. This could be even car speakers.
2. There is power lines going above the place where you are trying to calibrate.
3. To complete calibration you need to press both the volume control buttons while the vehicle is parked.. The display will show "CAL MODE". Then slowly drive at least 2 complete circles while in calibration mode. Then again press both the volume control buttons for 2 seconds until it beeps and shows " CAL DONE" in the display.

I was not aware you could turn off the display, maybe it is just a bad display and you need to replace the board??!!
Ive been repairing Microwaves for 37 years. i do not remember seeing one where you could just turn off the display.

This is one of the serious problem that arises because if you set your monitor with a high resolution with high frequency, then the monitor doesn't display anything as it's frequency is out of the rang or limit of the monitor's actual resolution capacity. Each monitor will have a limit of max frequency that is said to be the Refresh rate (for each and every resolution setting the display is refreshed.) When high resolution is set with high frequency that is not supported by the monitor, it then display a message like "frequency out of range". If you press ESC key within the few seconds of this setting, it will revert back to its initial resolution. But if you continued with the setting of same High resolution with High frequency, the monitor is not going to display anything because its frequency is out of the range. Most of old monitors like CRT's etc doesn't support 1024×768 at a refresh rate greater than 60Hz.

I had 2 and they both did the ERR thing and stopped working within a week of each other and that was about 7 years.

The CO detectors require replacement of the battery periodically.

Unlike smoke detectors, the detector element itself also requires replacement as well as the battery and is sold as a module with the battery attached.

This is most likely due to a cold solder joint for one of the display leads where they are soldered to the edge of the circuit board. Or, possibly, the display itself has gone bad.

the text display connection to board, not connected. take apart and re attach