Other Potential Problems; Mobile Terminal Does Not Power Up; Shutdown After 32 Seconds; No Audio - Nokia 6275 Baseband Description And Troubleshooting
Mobile terminal
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Also See for 6275:
- User manual (209 pages) ,
- Rf description and troubleshooting (64 pages) ,
- Disassembly (14 pages)
Table of Contents
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6275/6275i (RM-154)
Baseband Description and Troubleshooting
Other Potential Problems
Mobile Terminal Does Not Power Up
• Check the baseband regulators – VR3, VIO, VFLASH1, VCORE dc/dc, PURX.
• Check VCTCXO 19.2MHz signal at the D2800 input.
• Check the power up sequence.
• Check Flash IC, flash bus signals, and voltage level.
Shutdown after 32 Seconds
• Check for the absence of 32KHz SleepCLK.
• Check for incorrect SleepX and PURX signal levels.
• Check if the ESN number was corrupted.
No Audio
• Check for bad contacts or damaged earpiece.
• Check for bad connections at the microphone.
• Check for broken or bad solder joint of transistors and audio ASIPs.
• Verify the audio signal paths using baseband "audio test" component with
Phoenix.
Keypad Malfunction
• Check for protective film left on the back of the key dome if a new one was
installed.
• Check for corrosion on the keypad and keydome.
• Check if the flash software was corrupted.
• Check for a bad joint from the D2800 to the Z2400 interface.
• Check for damage on the Z2400.
No LCD Display
• Check for bad connections.
• Check for a cracked or damaged display.
• Probe test points for missing or incorrect signal levels.
Page 42
Company Confidential
Nokia Customer Care
Issue 1 - September 2006
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Table of Contents
Troubleshooting
