Nokia NPC-1 Series Troubleshooting Instructions page 27

PAMS Technical Documentation
AMPS, PL2, CH383
Visual check of TX
block
- PA and up converter
-TX SAW
- Duplex filter
- Passive components
Check LO-signal
(1017.03 MHz)@up
converter
and TX VHF (361.08
MHz)@N750
OK
Check supply voltage
- VR2
- VBATTRF
- VR5
- IPA1
- TXP1
OK
Check TXi/q signals
Test points J901...J904
OK
Check TX IF input
power (180.54 MHz) @
up converter
IF: -20 dBm +3 /-6 dB
OK
Check TX RF (836.49
MHz) output power and
@ up converter
RF: 0 dBm +/- 6dB
OK
Issue 1 10/01
Figure 12: Fault tree. Transmitter troubleshooting
OK
NOK
troubleshooting
NOK
Check UEM and UPP
(Baseband)
Check UEM
NOK
(Baseband)
NOK
Change SAFARI
NOK
Change up converter
ãNokia Corporation
Troubleshooting Instructions
Start synth
NPC-1
Page 27