Ericsson R250s PRO Troubleshooting Instructions page 30

Check the soldering at D600 pin 124 and 128.
•
Measure the resistance from X825 to D600 pin 128, and from P611 to D600 pin 124 ~0
ohm.
8.7 Keyboard key malfunction
Disassemble the phone and check for liquid damage, especially around the keys that are non-
functional.
No further action should be taken for a liquid damaged telephone.
Remove the domefoil and clean the keypads thoroughly and mount the phone with a new
domefoil, according to mechanical repair guide. If that did not help, disassemble the phone and
check the soldering at D600 pins 120-128 and 1 If they are correct, give the board power and
start it up.
Measure VDIG (3.2V) at C600.
4/00021-2/FEA 209 544/18 D
If the resistance is incorrect there is a foil damage, send the unit on according to the
local company directives.
If they are all correct, replace D600.
Standard Trouble Shooting Instructions
30(35)