Sim Problems - Ericsson R250s PRO Troubleshooting Instructions

7 Sim Problems

7.1 What is "SIM fault"
Insert a working SIM-card and a fully charged battery into the phone and start it up.
If the display says:
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7.2 "Insert card" fault
Replace the Sim-card holder without disassemble the phone, according to mechanical repair
guide. If the fault still remain disassemble the phone and check for liquid damage.
No further action should be taken for a liquid damaged telephone.
Check the soldering at D600 pads 72 to 75. If the soldering are correct, place the board in the
fixture, measure the signals to the SIM-card using an oscilloscope.
Set the oscilloscope at DC-measurement. 1V/frame and time measurement: roll.
Measure at the SIMVCC-pad. Give the board power and start it up. Directly at start the phone
sends 5 pulses to the SIM, with an amplitude of 5V as in the figure below.
Do the same procedure at the SIMCONCLK-, SIMCONDAT- and SIMCONRST-pads.
OBS! The phone has to be restarted between each measurement.
4/00021-2/FEA 209 544/18 D
"Wrong card" or "Insert correct card" the phone is SIM-locked and cannot be
repaired at this level
"Phone lock" the customer has locked the phone with a personal code. The phone is
unlocked in the reset program in the ordinary flow.
"Pin?" or "Enter pin" the SIM is locked with a personal code.
"Tampered" the customer has been trying to replace the software data into the phone.
The phone cannot be repaired at this level.
"Insert card" then, and only then, there is a SIM fault
Standard Trouble Shooting Instructions
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