Tdma1900 Tx - Nokia NSW-6 Series Disassembly & Troubleshooting Instructions

NSW-6
Disassembly & Troubleshooting

TDMA1900 TX

TDMA1900 mode and DAMPS mode have common IF section and anten-
na circuit and thus it is important that DAMPS mode have no faults.
Is TDMA800 mode OK
?
Y
Are LO signals OK ?
Y
Check current
consumption
I: > 350mA(rms)
N
Make press down test
for PA. Inreasing
current consumption ?
N
TDMA1900 continued next page
Page 38
N
Start TDMA800
troubleshooting
N
Start synth
troubleshooting
Y
Check antenna circuit
and Duplex–filter
Short circuit in PA?
Y
Resolder or change
PA.
E Nokia Mobile Phones Ltd.
PAMS Technical Documentation
Note!
Check VHF and UHF locals including
LO–buffer, measuring point for UHF is
N980 pin5.
Note!
The PA ground slug
might be poorly soldered
or there is delamination
on chip.
Issue 1 12/99