Ericsson R250s PRO Troubleshooting Instructions page 28

8.3
•
If the resistance to ground is to low from the pad:
If the fault still remains, replace D600.
Check the soldering at D600 pins 122, 123 and 128.
•
Measure the resistance from X824 to D600 pin 123, from X827 to D600 pin 122 and from
X825/X826 to D600 pin 128, (all of them ~0 ohm).
8.4 PTT button malfunction
Disassemble the phone and check for liquid damage, especially around X820 andX823.
No further action should be taken for a liquid damaged telephone.
Make sure that the function of the micro switches in the front cover is ok, if not replace the
faulty switch according to mechanical repair guide.
•
Measure the resistance from the pad X820 and X823 to ground >1 Mohm,
if it is less, go to.8.3.1
8.4.1
•
If the resistance to ground is to low from pad:
If the fault still remains, replace D600.
8.4.2
•
Check the soldering at D600 pins 125 and 128.
Measure the resistance from X820 to D600 pin 125, from X823to D600 pin 128
(all of them ~0 ohm).
4/00021-2/FEA 209 544/18 D
X824: replace C657 and C687.
X825: replace C658 and C688.
X826: replace C658 and C688.
If any of the resistances are incorrect there is a foil damage, send the unit on according
to the local company directives. If they are all correct, replace D600.
If the resistance is correct, go to 8.3.2
X820: replace C601 and C689.
X823: replace C658 and C688.
If any of the resistances are 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
28(35)