Nokia 8310 Repair Hints page 15

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SCCE Training Group

N600

set phone with Phoenix to local mode and activate TX-burstmode Ch.37 (Ch.700 for GSM1800).

check 26MHz reference clock at C660, refer to signal shown on page 14.

check VR1A 4.75VDC at C600, VR2 2.8VDC at C723, VR3 2.8VDC at C662, VR4 2.8VDC at C601, VR5 2.8VDC at C603,

VR6 2.8VDC at C605 and VR7 2.8VDC at C650

check with an oscilloscope TXC at C615 (0.5Vpp – 2.1Vpp depending on TX-powerlevel), also check TX/IQ-signals at

C616/617:

check with an oscilloscope RFBUSDA at J2, RFBUSCLK at J3 and RFBUSEN1 at J4:

check signal of SHF-oscillator at T650 pin 3 and 4 (3589.6MHz/Ch.37, 3495.6MHz/Ch.700). Refer to signal shown on previous

page.

If these signals are ok but no TX-signal is measurable at C726 (C700 in GSM1800), you have to change Hagar N600.

Unfortunately TXP and Hagar reset, which also are necessary for a working Hagar are not checkable because of missing testpoints.

Change UPP D400 in case of doubt and retest the phone.

D200

if it seems that UEM D200 is responsible for the fault because of missing TXC- or corrupted TX/IQ-signals, at this

moment it makes no sence to change this part because of missing possibility to rewrite phonedata after changing

UEM D200.

D400

it has been seen that in some cases UPP D400 was responsible for "No Service"-faults. Unfortunately it is not possible

to check some important signals because of missing testpoints (e.g. TXP, Hagar reset). Nevertheless you can check with

an oscilloscope for activity on the RFBUS (J2/3/4). If already here a signal is missing and there is no short circuit to ground

on these lines, you should change D400.

Note that it is necessary to reflash the phone after changing UPP. Otherwise the phone will not switch on.

CONFIDENTIAL

NHM-7

Date 28.02.2002

Checked by:

SCCE Training Group

15 (18)

Repairhints

Version 1.0 Approved

Approved by:

SCCE

Nhm-7