Audio Troubleshooting - Nokia 6265 Baseband Description And Troubleshooting

6265/6265i/6268 (RM-66)
Baseband Description and Troubleshooting

Audio Troubleshooting

When troubleshooting the audio, make these common checks (see
• Perform a visual inspection of all the ASIPs and the UEMEK.
• Inject a 1KHz signal into MiC1 and trace it to the earpiece. Only when using IHF
signal will be amplified by a factor of 8x.
Audio ASIPs
DC Block Caps
Audio ASIPs
• Make sure the audio amplifier and solder are ok.
• Make sure the IHF speaker contacts are ok.
• Make sure output is amplified by 8x. If not, check that the gain resistors network
is correct.
DC Block caps
©2005 Nokia Corporation
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Figure 9: UEMEK Side of Audio diagram
Audio amplifier
Figure 10: Figure 9: IHF troubleshooting
Company Confidential
Figure 8):
FM Radio lines
IHF
Issue 1 11/2005