GE865-QUAD. Pcb from old project. Several seconds after AT#SIMDET=1, module hungs up. It seems that it try to read. Gives me READY several times, blinking led changes blinking rate.
Network registration is disabled. Same problem in 5 same pcbs.
Only from time to time some of pcb can even connect to network when I enable this.
Sim is ok, signal level too.
I can see all 3 bulgarian operators.
The power source/lines/capacitors?
220uF tantal on power line, Li-Ion battery 900mAh, voltage approx 3,9V.
Module works and responds to at-commands long tome.
Only after SIMDET=1 one module hungs up, 2 others start restarting.
Network registration is forbidden (COPS=2).
Poor soldering of some of SIM pads?
One of modules do not restart but rarely. When do not restart, it can register by COPS=0.
Signal level approx -70dBm.
After restart, I receive the string like: ‘&dr&>
New module connected with wires. Same rasult – SIM is ready, but not possible to ocnnect to network.
As Cosmin suggests it’s probably a power issue, most likely the PCB power tracks to the module in particular the ground tracks, these need to as wide as you can get them.
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