PAMS
Technical Documentation
NSB–1/3
Troubleshooting Instructions
Page 12
Original 06/98
Instructions for RX troubleshooting
Use high impedance RF–probe and calibrate your phone with functional phone.
Note! Power level measurement accuracy with RF–probe is
±
2 dB.
Use WinTesla to set RX continuous mode and RX on.
Apply 1960 MHz
–50dBm signal to
external RF–connector
X451.
Check
duplexer(Z401)
(max IL 3dB) output:
P:~53dBm
Check filter Z604
(max IL 3.2) output:
P:–40dBm
Check C603 and
C604. Check CRFU
pin 18 and 19:
f:487MHz P:–24dBm
N
N
N
Check RF–connector
X451. Check input
of duplexer. Replace
if necessary.
Check input of Z604
and L611.
P:–37dBm
Change
filter Z604.
Check input of
C601:
P:–37dBm
Check C600,R611
and measure CRFU
pin 5:2.4V
Check R612
and CRFU pin
12:1.2V
Check V600;
b:0.86V.
Check C623 and
L610
N
N
Check CRFU
pin 4:2.8V
(FRAC)
Goto BB
troublesh.
N
Check R600 and
C666: 2.7V
Goto BB
troublesh.
N
CRFU pin 21:2.7V
pin 23:P:–40dBm
pin 14:2.8V
CRFU pin 16:
(MID ch) P:+0dBm
Check C710.
Goto UHF VCO
troublesh.
N
f:1473MHz
f:1960 MHz
