Totally Dead - Nokia NPE-4 Service Manual

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Electrical faults

Totally dead

Check VBATIN=3.6 VDC at L260 (depends on workbench supply). If not ok, check X101, X102 battery connectors for mechanical
damages or cold solderings. Refer also to chapter "Additional Information/Different battery connectors".
Check 32.768 kHz sinewave, Vpp = 800 mV at C209 (See picture below).
Oscilloscope settings:
Ampl: 200mV
Time/Div: 10µs/Div
AC/DC/GND: AC
If there is no signal, check B200 circuit for shorts or disconnection and change faulty components.
Check PWRONX at S300 pin 2/ 4:
If not ok, check PWRONX-line from S300 to UPP D400 for shorts or disconnections.
Check SleepClk = 32.768 kHz, Vpp = 1.8 V square wave at J404. (See picture below)
Oscilloscope settings:
Ampl: 500mV
Time/Div: 10µs/Div
AC/DC/GND: AC
If not ok, check B200 circuit for shorts or disconnections.
Check VCORE = 1.8 VDC at C400. If not ok, check UEM D200
Check PURX = 1.8 VDC at V130 Pin 44. If not ok, check UEM D200
Check System Clk = 26 MHz, Vpp = 800 mV at C752 (See picture below)
© NMP 2002
CONFIDENTIAL
NPE-4 6310/NPL-1 6310i
Date 15.08.2002
Key not pressed = 3.6 VDC (Depends on Workbench supply voltage)
Key pressed = 0 VDC
Checked by:
SCCE Training Group
7 (25)
Repairhints
Version 1.0 Approved
Approved by:
SCCE