CONFIDENTIAL
Service & Analysis Center Europe
Training Team
version 1.0 / 19.10.1999 Page 39 of 41
Call breaks / No service
G550 UHF Oscillator out of range or high spurious emission
• check the UHF frequency on G550 for high spurious or deviation
• check the UHF-VC on pin 21 N600 1,9V-3.2V depending of the channel
• check the 5V VCP supply voltage on pin 13, 22 from N600 SUMMA or pin 32 from CCONT
• check R507 10Kohm, C542 1nF
No Call / service O.K.
N100 CCONT faulty
• check if the "Insert SIM-card" message appear sometime on the display
• check if it's possible to read the saved phone numbers of the SIM-card
• Resolder CCONT
• Change CCONT
No TX – Power or to low
N501 / N502 / X 560 faulty
• Check the power supply Vbat N502 pin 2,3,4,12,13 / N501 pin 4,6,11,12,13
• Check the input power on pin 8 N501/ pin 6 N502 depend of the band (nominal 0dbm)
• Check the outgoing power on pin 12 or 13 N501/ N502
• Check the TX-Power control on pin 9 N501/ N502 ,1Vpp-1,5Vpp / 0,4..V - 0,9..V DC depend of the power-
level (see the diagram below)
• Change the PA if no power or to low power comes out
• Check the TX-Power on the antenna IN/OUT pads from X 560
• Check the X560 connector if it's a high attenuation
To Next Page
Loading...
Need help?
General
