Npe-4 6310; Electrical Faults; Drop Calls - Nokia 6310 Manual

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NPE-4 6310

Electrical faults

Drop calls

Disassemble the NPE-4 and the RF- shield, and then connect the PWB to the MJS-40 jig.
Insert a SIMcard and connect the coaxial cable to the tester (e.g. CMD). Now start a call.
After the call is established, check if the testers (e.g. CMD) analyzer display shows a frequency error.
If fault does not appear or appears intermittently only, press on 26MHz oscillator G740 with a non-metallic item.
If the frequency error appears or increases in this case, probably the 26MHz circuit is faulty.
Open the Phoenix menu Testing/ RF controls and activate local mode RX GSM900.
Check 26MHz +/- 100Hz at C752 or R752 on spectrum analyzer and active frequency counter (see figure 26 MHz)
Figure "26 MHz"
If the frequency drift is higher than +/ - 100Hz, check VR3 (VCC) = 2.8 VDC at R740 and check AFC (1.3 – 2.3 VDC) at C744
- If not ok, check UEM D200.
Check if fault is getting stronger by pressing the top of the 26MHz oscillator G740. Change 26MHz oscillator if necessary.
Check 13 MHz +/- 100Hz at C424 with spectrum analyzer (see figure "13 MHz").
Figure "13 MHz"
- If not ok, check /change Hagar N600.
© NMP 2003
CONFIDENTIAL
NPE-4 6310/NPL-1 6310i
Date 22.04.2003
Checked by:
SCCE Training Group
13 (29)
Repair Hints
Version 3.0 Approved
Approved by:
SCCE