Buzzer Does Not Work; Keyboard Does Not Work; Receiver Troubleshooting; General Instructions For Rx Troubleshooting - Nokia RH-41 Series Troubleshooting Instructions

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RH-41

Troubleshooting Instructions

Buzzer does not work

Check spring connectors and C306.

• No sound: Try using a known good buzzer instead. If there is still no sound, change the

UEM (D200)

• Weak sound: Use the Audio test in Phoenix to set the buzzer parameters (frequency,

strength). If it does not affect the sound level, change the buzzer.

Check that there is no dirt between the dome sheet and the PWB. Check EMI/ESD filter

(Z301) that all lines come through. If not, change Z301. If the keyboard still does not

operate normally, try to use the Keyboard test in Phoenix to see if the pressed key is

identified. If it is not identified, change the UPP (D400).

Start the Phoenix software and use it to start the required RX mode of the mobile phone.

The troubleshooting flowchart is divided into three steps: (1) general checking, (2) local

checking, and (3) RX chain checking.

Note: Before changing ASICs or filters, all solderings and missing components must be checked visu-

ally. After any possible component changes, the phone must be tuned with the Phoenix autotune SW .

Block level description of the receiver:

(Antenna/ext RF) – Diplexer – Duplexer – Low Noise Amplifier (LNA) – RX band filter –

First mixer – 135.54 MHz RX IF filter – IF-amplifier – second mixer – 14 kHz low-pass fil-

ter – adjustable IQ amplifier – Baseband.

Page 20

Nokia Corporation

CCS Technical Documentation

Confidential

Issue 2 09/2003

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