Nokia 8310 Repair Hints page 17

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G660

first thing to do as in case of TX-faults is to set phone with Phoenix to local mode, activate RX-burstmode Ch.37

check VR3 2.8VDC at C662. With only this voltage the oscillator must be able to work on a frequency of 26MHz.

Otherwise you have to change G660. Signal of G660 at C660 is shown on page 14.

AFC-voltage at C661 normally is 1.25VDC, but may vary between 0.05VDC and 2.5VDC.

If frequency deviation of G660 is >100Hz it is necessary to change the oscillator!

G650, C653

to check if the SHF-oscillator G650 is working you have to activate RX-burstmode Ch.37. After that check signal

(3769.6MHz) at T650 pin 3 and 4 as shown below:

If no signal is measurable at T650 check VR7 2.6VDC at C650. If OK, set span of your analyser to e.g. 250MHz to check if the

oscillator works on any other frequency as on the supposed. In case of that check control voltage at C652 which normally is

3VDC on channel 37. Especially check C653 (tendency to leak) in case of noise on the control voltage.

In case that the oscillator does not work at all, change G650 and retest the phone.

N600

set phone with Phoenix to local mode and activate RX-burstmode Ch.37 (Ch.700 for GSM1800), set RF-generator to

high RF-level output, e.g. –40dBm

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

check incoming RX-signal of 942.4MHz at L501 (1842.8MHz at L551)

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 RFBUSDA at J2, RFBUSCLK at J3 and RFBUSEN1 at J4, refer to signals shown on page 15

check signal of SHF-oscillator at T650 pin 3 and 4 (3769.6MHz/Ch.37, 3685.6MHz/Ch.700) as shown in the picture before.

If these signals are ok but no RX/IQ-signal is measurable at C608/611, you have to change Hagar N600. Probably UPP D400

is faulty. Change part in case of doubt and retest the phone.

CONFIDENTIAL

NHM-7

Date 28.02.2002

Checked by:

SCCE Training Group

17 (18)

Repairhints

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