Model 7620U Bench Scale User’s Manual
26
Display shows upper “
_ _ _ _
“ dashes
(Indicates the scale is over capacity.)
1. Remove all items from the scale.
2. Press the ZERO key.
3. Power off, and then power on the scale.
4. Recalibrate the scale.
5. Replace the QDT load cell.
Scale is not transmitting data to the host
device
1. Check cable connection at both the rear
of the scale and the host device.
2. Check communication setting and baud
rate on both the scale and host device.
3. Perform I/O loopback test.
4. Replace the cable.
5. Replace the I/O board.
6. Replace the QDT load cell.
The ZERO key and the TEST key do no
function
1. Check the position of Switch 3. Closed for
internal display keypad active. Open for
external display keypad active.
2. Open display enclosure and verify that the
keypad cable is still installed correctly.
3. Replace the display panel.
4. Replace the display PCB.
5. Replace the display cable.
6. Replace the I/O PCB.
7. Replace the QDT load cell.
