Nokia NSE-3 SERIES, Service Manual

Page: 124 / 217

PAMS
Technical Documentation
NSE–3
Disassembly & Troubleshooting Instructions
Page 21
Original, 11/97
Receiver Fault (1)
Duplexer ant–pin, SL: –58 dBm
Loading between X540 pin 1
and 2 ~ 0
Ω
Change X540
Check soldered joints of X540
and Z550, check also that X540
is assembled correct, if OK
Change Z550
N500 pin 25, SL: –61 dBm
N500 pin 25,
loading > 1 M
Ω
Check C506, if OK
change N500
Change duplexer
Duplexer Rx–pin, SL: –61 dBm
N500 pin 23, SL: –38 dBm
N500 pin 26 is ”HIGH”
N500 pin 26,
loading > 1 M
Ω
Check PDA
T
A0–line
for short circuits
N500 pin 17 and 19, 2.8V
Check PDA
T
A0–line
D200 pin 171
Check VRX(J510)
and
VSYN_1(J516) lines
from CCONT
Check VREF_2(J518)
voltage line
Check soldered joints of N500 and R504, if OK change R504
Check components in line out
of pin 23, if OK change N500
N500 pin 23, loading 10 k
Ω
N500 pin 16, 1.5V
N500 pin 20, loading 10 k
Ω
Z500 input, SL: –44 dBm
Z500 input, loading > 1 M
Ω
Check soldered joints,
if OK change Z500
Check C500 soldered joints,
if OK change it
Z500 output, SL: –47 dBm
Z500 output,
loading > 1 M
Ω
Check C518, C504,
if OK cange Z500
Change Z500
N500 pin 7 and 8, SL: –57 dBm
Check soldered joints of C516,
C520 check internal coils
N500 pin 7 and 8,
loading 50
Ω
Rise up N500
pin 7,8. If level
back to normal
change N500
Change N500
1st IF
71 MHz
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
YES YES YES
YES
YES
YES
YES
YES
NO
YES
YES
YES
YES YES YES
YES
NO
Receiver
Fault
YES