User Guide

CCS Technical Documentation RF Troubleshooting Instructions

RH-12/RH-28

Issue 1 02/04 Nokia Corporation Page 17

Bluetooth troubleshooting

Phoenix local mode: Tx data 1 ch. 39 (2441 MHz approx. 1 MHz BW).

BC02 Bluetooth control. Options: Internal gain = 52

Measure PURX voltage = 1.8 V (N131)

BB troubleshooting

Measure N130 BT supply voltage = 2.8V (C144).

Replace N131

NOK

Measure N130 VDD-ANA voltage regulator output = 1.8V (C140).

Replace N130

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Measure a) N130 VDD_VCO supply voltage = 1.8V (C137)

b) VDD_MEM supply voltage = 1.8V

c) Rx/Tx supply voltage = 1.8V (C130)

Check L133, R132

and L130

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Measure SYSCLK voltage = 550 mVpp (26 MHz) 1.3 VDC (C133).

Check C133 and go to

Synthesizer

troubleshooting.

Measure N130 XTAL_IN

voltage = 1.8Vpp square wave (R131)

Measure D130 supply voltage = 2,8V

at D130 pin 5

Check L131, L132. If passive components-

OK, replace D130.

Measure RF level = -15 dBm at a TX_A (C131)

and b) TX_B (C132).

Measure RF level = -18 dBm at Z131 SAW filter input.

Measure RF level = -18 dBm at Z131 SAW filter output.

Replace Z131

Check T130 and C130

Check L131, L132. If passive components

OK, replace N130

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Spectrum analyzer: RBW = 500 kHz, VBW = 500 kHz,

center = 942 Mhz and span = 20 Mhz.

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