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NPE-4 6310/NPL-1 6310i Repair Hints
Customer Care Europe, Middle East & Africa Version 3.0 Approved
SCCE Training Group Date 22.04.2003
© NMP 2003
Checked by:
SCCE Training Group
Approved by:
SCCE
Make the following measurements in burst mode with an oscilloscope in DC mode.
Oscilloscope settings:
Ampl: 200mV
Time/Div: 1ms/Div
AC/DC/GND: DC
If not ok, check 67.71 kHz at C714 (DtoS and Biquad filter).
Order of measurement points at C714 (counted from N600 Hagar side): pins (3/4)= DtoS I/Q;
pins (1/2)= Biquad (CM_F and CP_F I/Q).
DtoS
Biquad
Oscilloscope settings:
Ampl: 500mV
Time/Div: 200µs/Div
AC/DC/GND: DC
If the signal is not ok, check in GSM the RX signal 942.4 MHz at channel 37, RF level –55 dBm at L626.
If the signal is not ok, check in PCN the RX signal 1842.4 MHz at channel 700, RF level –55 dBm at L616
If both RX signals not ok, check RX lines from N600 Hagar to X802 antenna connector for shorts or
disconnections.
Check the following voltages:
Check VR4 = 2.8 VDC at C601
Check VR5 = 2.8 VDC at C604
Check VR6 (VBB) = 2.8 VDC at C605
Check VR1A (VCP) = 4.7 VDC (supply for control voltage VC for SHF oscillator) at C600
Check VR7 = 2.8 VDC at C299 (supply voltage VCC for SHF oscillator)
Check VREF01 and VREF02 = 1.35 VDC at R726
- If one of the voltages described above is not ok, check UEM D200.
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