User Guide

PAMS
Technical Documentation
RAE-3
8. Troubleshooting
Page 8 – 73
Issue 1 06/01
2.20 RF Interface
2.20.1 Phone doesn’t register to the network or doesn’t make a call
Phone does not register to the
network or does not
make a call
C254 (VCOBBA)>2.7V ? Check N100 CCONT
C100 (Vref) = 1.5V ?
YES
NO
Check C100, R211
NO
Check supply voltage during RX slot:
C101 (VCP) >4.8V
C133 (VRX) >2.7V
C135 (VSYN_1)>2.7V
C134 (VSYN_2)>2.7V
During TX slot:
C136 (VTX) >2.7V
N600 (VCHP) = 4.7V ?
SynthPwr (J319) = 1 (2.8V) ?
VCXO_Pwr (J302) = 1 (2.8V) ?
Check CCONT N100
Check D300 MADLinda
OK
NO
Check synthesizer lines during RX slot:
J502, J501/J505 SENA1
J501 (SCLK)
J500 (SDATA)
= Pulses ”0” –> ”1” ?
And
R800 (Reset) = ”1” ?
Check
Reser at
N600 pin1 =”1”
?
Check
N600
C783
C784
C785
N505
(Hagar)
YES
Check
R800
C793
D300
(MADLinda)
NO
Check D300 MADLinda
Check RF control lines during RX slot:
R708 (RxC, N240)= 0 – 2.3VB max.
R832 (AFC, VCXO)=0 – 1.2V typ.
Check N200 COBBA
Check analog data signals during RX slot
R533 (RxIN, Cobba)=0 – 1.5V DC
C532 (RxIP, Cobba)=0 – 1.5V DC
Received signal is biased to DC,
nominal amplitude=
50mVpp, freq.=13MHz
If DC failure:
Check N200 Cobba,
else
Check RF part
Check RF control lines during TX slot:
R792 (TxC, Cobba)=0 – 2.3V max.
J320(TxP) = ”0” –> ”1”(2.8V)
NO
NO
NO
NO
If TxC failure:
Check N200 Cobba,
If TxP failure,
Check D300
Check analog data signals during TX slot:
R541 (TxIN, Cobba)
R541 (TxIP, Cobba)
R546 (TxQN, Cobba)
R546 (TxQP, Cobba)
Transmitted signal is biased to DC,
nom.ampl=300mVpp, freq.=64kHz
NO
Check N200 COBBA
R541, R546,
C540, C541
YES
NO
YES
YES
YES
YES
YES
YES
YES
YES
Check RF part
Figure 61.