Call Breaks / No Service; No Call / Service O.k; N Otx - Power Or To Low - Nokia 6150 Service & Repair Hints

Call breaks / No service

G550 UHF Oscillator out of range or high spurious emission
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check the UHF frequency on G550 for high spurious or deviation
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check the UHF-VC on pin 21 N600 1,9V-3.2V depending of the channel
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check the 5V VCP supply voltage on pin 13, 22 from N600 SUMMA or pin 32 from CCONT
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check R507 10Kohm, C542 1nF

No Call / service O.K.

N100 CCONT faulty
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check if the "Insert SIM-card" message appear sometime on the display
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check if it's possible to read the saved phone numbers of the SIM-card
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Resolder CCONT
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Change CCONT
No TX – Power or to low
N501 / N502 / X 560 faulty
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Check the power supply Vbat N502 pin 2,3,4,12,13 / N501 pin 4,6,11,12,13
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Check the input power on pin 8 N501/ pin 6 N502 depend of the band (nominal 0dbm)
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Check the outgoing power on pin 12 or 13 N501/ N502
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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)
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Change the PA if no power or to low power comes out
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Check the TX-Power on the antenna IN/OUT pads from X 560
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Check the X560 connector if it's a high attenuation
version 1.0 / 19.10.1999
CONFIDENTIAL Service & Analysis Center Europe
Training Team
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