Nokia 8910 - Quick and easy; Making a call; Call functions

CONFIDENTIAL 12 (16)
NHM-4/NHM-4NX 8910/8910i Repairhints
Customer Care Europe, Middle East & Africa Version 2.0 Approved
SCCE Training Group Date 03.06.2003
© NMP 2003
Checked by:
SCCE Training Group
Approved by:
SCCE
“Insert SIM card”
Pre-Check:
Insert a working SIM card and turn on the phone.
- If “Insert SIMcard “ appears on the phone display, follow the repair instructions:
o See “Insert SIM card”
“Insert SIM card”
- If “Insert SIMcard” appears on display, disassemble the phone and put the PWB into the repair jig MJS-39. Set the
power supply to 4VDC and the oscilloscope to 500mV/div. Do not insert the SIMcard. Hold the probe on Pin 1. Now
connect the power supply to the jig and turn the phone on. For a short moment the flat line jumps up. Repeat this
procedure with pin 2,3 and 6. Do not forget to disconnect the power supply after every measurement.
- If one or all four lines do not react when connecting the power supply, check resistance of VSIM line = 0 Ohm
between C203, C389 and X386 Pin3.
- If the line is ok, insert the SIMcard, connect the power supply to the repair jig, and check:
VSIM = 3VDC at Pin 3 of X386
SIMCLK = 3.25MHz at X386 Pin1
SIMRST = 3VDC at X386 Pin2
SIMDATA at X386 Pin6
- If one or all signals above not measureable, change R388.
- If the fault persists after changing R388, change UEM D200.
VSIM (Figure 2)
Note!:
This oscillograph is only measur-
able with digital oscilloscope
and no SIM card assembled.
Delay: 22ms
Single shot activ
SIMDATA (Figure 3)
SIMCLK (Figure 4)