Rf Tunings; Introduction To Rf Tunings - Nokia RM-42 Service Manual

RM-42
Nokia Customer Care RF Troubleshooting and Manual Tuning Guide
Figure 67 Antenna frame, contact springs and WCDMA
antenna
Figure 68 GSM antenna radiator
The WCDMA antenna is working correctly when it is visually intact and DC resistance between the contact springs
is about zero ohms. The GSM antenna works when the flex film is intact and contact springs are assembled in
the frame as figures above and below show.
Bluetooth antenna
Bluetooth antenna is a ceramic chip antenna assembled on the engine PWB. The antenna is working properly
if it has been assembled in correct position and if solder joints of the antenna are all right and the antenna is
intact.

RF tunings

Introduction to RF tunings

Phone RF is tuned in production. There is no reason to do the re-calibration unless:
• One or more of the RF components is changed
• FLASH Memory chip (D3000) is changed or otherwise corrupted.
RF calibration is always performed with the help of module jig MJ-48. Whenever possible, automatic tuning
system should be used.
If manual tuning is used, only relevant tunings should be performed. Refer to the table below:
Page 7–18 Company Confidential 9241872 (Issue 1)
Copyright ©2005 Nokia. All Rights Reserved.