Instructions For Tx Troubleshooting - Nokia NSB-1 Series Troubleshooting Instructions

NSB–1/3
Troubleshooting Instructions

Instructions for TX troubleshooting

Use attenuator with P> 0dBm at input of RF–probe.
–TX on, burst mode.
TXQP:R501 0.8V
TXQN:R501 0.8V
TXIN:R504 0.8V
TXIP:R504 0.8V
TXP:J408 >2 V
TXC:J407 0.5–2 V
depending on
TX–level
Check PLUSSA
N401 pin 61 and 62:
f:400MHz
P:–19...–15dBm
CRFU (N402)
pin 7 and 9: f:400MHz
P:–19...–15dBm
Check CRFU (N402) pin
11: MID ch
f:1880 MHz
P:–3...+5dBm
Page 14
N
Goto Baseband
(BB)
troubleshooting
N
Goto
BB
troublesh.
N
Check PLUSSA pins
2, 10 and 63:
2.8V (VTX)
pin 58: 1.5V (VREF)
PLUSSA (N401)
pin 8:
f:800MHz
P:–2...0dBm
Change
PLUSSA
N
Check C527, C545,
L501, L500, C519
and C518
N
CRFU (N402)
pin 13:2.8V
CRFU pin 16:
f:1480MHz P:+1–0dBm
Check CRFU pin
14:2.8V
Change
CRFU
Technical Documentation
N
Goto BB
troublesh.
N
Goto VHF VCO
troublesh.
section
N
Goto BB
troublesh.
N
Goto UHF VCO troublesh.
section
f:1880 MHz
Original 06/98
PAMS