Nokia NPE-4 Service Manual page 8

Customer Care Europe & Africa
SCCE Training Group
Oscilloscope settings:
Ampl: 500mV
Time/Div: 20ns/Div
AC/DC/GND: AC
If not ok, check 26 MHz G740 circuit. Refer also to chapter Drop calls
Check RFClk = 13 MHz, Vpp = 600 mV at C424. If not ok, refer to No service/ No RSSI.
Check VIO = 1.8 VDC at C450. If not ok, check VIO line to UEM D200 for shorts or disconnections and change faulty components.
If all above-mentioned signals are ok, try to flash the phone.
If the the flash update fails, the prommer will display a fault message (see picture below)
Check VPP at C454 = 1.8VDC
If VPP is not ok, UPP D400 is faulty. Change PWB, because UPP is not changeable.
Check VFLASH2 at C280 = 1.8VDC
If not ok, UEM D200 is faulty. Change PWB, as UEM is not changeable.
If both voltages are ok, try to flash the phone with repair jig MJS-40 and measure the VFLASH2 again. Now the voltage at C280
rises up to 2.8VDC.
If the voltage does not rise up to 2.8VDC, change PWB, as the UEM D200 is not changeable.
If all voltages are ok, check the Flash for mechanical damage (see also picture at chapter Additional
information/BB shield disassembly instructions/Example for a broken Flash D450).
Change Flash D450 in following cases when all other signals ok:
- Mechanical damages (See picture at Additional Information/Example for broken Flash D450)
- IMEI not rewriteable or SimLock Test fails
After changing the Flash D450, rewrite product code, HW-ID, IMEI and SIMlock settings.
If the fault persists, probably UEM D200 is faulty and not changeable. Change the PWB.
Note! Rewrite SIMlock and IMEI data by use of NOKIA SECURITY PASSWORD and tune the phone again, if the procedure
is permitted to you. (See General SB–037)
© NMP 2002
CONFIDENTIAL
NPE-4 6310/NPL-1 6310i
Date 15.08.2002
Checked by:
SCCE Training Group
8 (25)
Repairhints
Version 1.0 Approved
Approved by:
SCCE