Micromax Q427+ User Manual

Q427+ L3 Service Manual
7. SIM not detecting:
Solution:
 Flash the handset with latest SW
 Check the SIM card socket is obviously damaged, if yes, Replace the SIM card socket
 Check the ground impedance of each pin of the SIM card socket(except the ground pin)is low(lower than
grade ),if yes, Replace the resistor of the corresponding pin;
 Check if the series resistors on each network of the SIM card have pseudo soldering ,if yes, Carry out repair
soldering of the series resistors on each signal line;
 Check the Power IC normally or not, then Re-Solder Power IC or change it.
 Check the CPU normally or not, then Re-Solder CPU or change it.
SIM
Connector
CPU
Power IC

Micromax Q427+ Specifications

General

Brand	Micromax
Model	Q427+
Category	Cell Phone
Language	English