Nokia 5510 - Page 19

PAMS Technical Documentation CMT Troubleshooting
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Phone doesn’t register to a
network or the phone is unable to
make a call
C207 (Vcobba) > 2,7V
Check CCONT (N201)
Vref at C201 =1,5V
Check C210, R509 and
C536.
Check supply voltage during RX slot :
C234 (VCP) > 4,8V
C240 (VRX) > 2,7V
C245, R202, C239 (VSYN_1) > 2,7V
C241 (VSYN_2) > 2,7V
During TX slot :
C242 (VTX) > 2,7V
Check CCONT
(N201)
Check synthesizer
lines during RX slot
R300 (->D300)
R301/302 (->D300)
for pulsing 1<->0
No
Yes
Yes
No
No
No
Check MAD2WD1
(D300)
Check COBBA (N100)
Check RF control lines
during RX slot :
R502 = 0-1,2V typ.
R514 = 0-2,3V max.
Yes
Check analog data signals during
RX slot :
R507 (RxIN, COBBA) = 0-1,5V
C514 (RxIP, COBBA) = 0-1,5V
Recieved signals is biased to 1,2
DC, nominal amplitude = 125-450
mVpp AC
If DC error : Check COBBA (N100)
else :
Check RF part.
Check RF control lines during TX slot :
J503 (TxP, MAD2) = "0"<->"1" (2,8V)
R518 (TxC, COBBA) = 0-2,3V max.
If TxC error :
Check COBBA (N100)
If TxP error :
Check MAD2 (D300)
Check analog data signals during
TX slot :
TxIN, COBBA
TxIP, COBBA
TxQN, COBBA
TxQP, COBBA
Transmitted signals is biased to
DC, nominal amplitude = 300
mVpp, freq. = 64 kHz
Check COBBA (N100)
Check RF part.
Yes
No
Yes
Yes
No
No
Yes
Yes
No