Ericsson R250s PRO Troubleshooting Instructions page 20

5.3.1 If all the LED's in group D are not lit
•
Check the soldering and measure the resistance of R609, R660, R607 and R608.
If the fault remains, give the board power only, do not switch it on.
•
Measure 3,4VDC at V613 pin3.
•
If the fault remains, measure the resistance between V613 pin1 and D600 pin92. It should
be 1 kohm.
5.3.2 If all the LED's in group K are not lit
•
Check the soldering and measure the resistance of R610, R607 and R608.
If the fault remains, give the board power only, do not switch it on.
•
Measure 3,4VDC at V614 pin3.
•
Measure1,7V DC at V613 pin1.
•
If the fault remains, measure the resistance between V614 pin1 and D600 pin92. It should
be 1 kohm.
4/00021-2/FEA 209 544/18 D
Replace the faulty component.
If it is above 3,4VDC,replace the LED's in group D one by one until the fault is gone.
If the 3,4V is ok, start up the board.
Measure1,7V DC at V613 pin1.
If yes 1,7VDC,replace V613.
If no 1,7VDC,replace C656.
If it is ok (1 kohm) replace D600.
If the resistance is high, send the unit on according to the local company directives.
Replace the faulty component.
If it is above 3,4VDC,replace the LED's in group K one by one until the fault is gone.
If the 3,4V is ok, start up the board.
If it is correct, replace V614.
If it is incorrect, replace C656.
If it is ok, 1 kohm replace D600
If the resistance is higher, send the unit on according to the local company directives.
Standard Trouble Shooting Instructions
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