Nokia 6110 - Transmitter Fault (1)

PAMS
Technical Documentation
NSE–3
Disassembly & Troubleshooting Instructions
Page 28
Original, 11/97
Transmitter Fault (1)
Transmitter
Fault
TXLEV 5
N620 pin 8(J542)
232 MHz SL: –28 dBm
N620 pin 61 and 62,
116 MHz SL: –40 dBm
VHFLO
N620: TXQP, TXQN, TXIP
and TXIN, OK ?
Check TXQP, TXIP, TXQN, TXIN
lines from COBBA pin 13...16 and
soldered joints at N620 and N250, if OK change N250(Test pins J558
& J560)
N620 pin 63(J514), VTX–pulse
OK ?
Check VTX supply voltage
from CCONT
N620 pin 58, ~1.5V
Check VREF_1 – line
N620 pin 59,
loading 15 k
Ω
Check R635 and soldered
joints
N620 pin 61 and 62, ~0.8V
Change N620
N500 pin2(J552) and pin3
(J550) 116 MHz SL: –32 dBm
N500 pin 2 and 3,
loading > 1M
Ω
Check N500 pin 2 and
3 for short circuits, if
OK change N500
Check C652, C653, C655,
L623, L624, R623, R625, if OK
change N500
N500 pin 12(RX–Continous),
SL: –28 dBm
UHFLO
N500 pin 30,
SL: –18 dBm
N500 pin 1 and 29,
~2.8V
Check VTX supply voltage
from CCONT
N500 pin 16,
~1.5V
Check VREF_2 – line(J518)
N500 pin 20,
loading 10 k
Ω
Check R504 and soldered
joints
Change N500
Transmitter
1
N620 pin 1,
TXP–pulse OK?
Check TXP–line from MAD
N620 pin 11, TXC–pulse OK?
Check TXC–line from COBBA
TXQP, TXIP, TXIN, TXQN, TXP and VTX: Oscilloscope pictures in Appendix C
YES
YES
YES
YES
YES
YES YES
YES
YES YES
YES
YES YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO