Appendix A: RF Troubleshooting
Nokia Customer Care
Company Confidential
Copyright
©
2005 Nokia. All rights reserved
A-19
2.8 WCDMA transmitter self test (ST_CDSP_WCDMA_TX_POWER_TEST)
TX_WCDMA_POWER_TEST (75) checks the output power of the WCDMA transmitter.
Test covers: Modulator, Vinku (N7501) IC gain stages, IC output supply components, TX filter, WCDMA
PA (N7503), DCDC-converter (N7504), RFBUS, VBAT_ASIC, VBAT_PA
Test does not cover: Circulator (Z7505), duplexer (Z7502), and antenna
To prevent network interference, the phone must be in an RF shield box, when this test is run!
Error code for this self test is given in format:
•
0xyy, 0xzz, MeasResult1, MeasResult2
,where 0xyy, 0xzz part is the main part of the error code:
0xyyzz
Too low
output power
(0x0010)
ST_CDSP_WCDMA_TX_POWER_TEST
Propablecause:
Poor solder/FaultyVinku
YES
NO
Any other code
YES
It’s not possibleto
get here
…
NO
Propablecause:
Test problem
RFBUS failure (but this should
be ok if we’ve gotten this far)
Any power
at
Vinku
output
at
all
?
YES
NO
Propable
cause:
Plenty of components
involved. Go through the whole
“WCDMA TX power and transmit
Frequency ok?”
to find reason.
ST_CDSP_WCDMA_TX_POWER_TEST
YES
NO
Any other code
YES
NO
YES
NO
Too low output power
(0x0010)
It’s not possible to
get here…
ny power at Vinku
output at all?
Propable cause:
Test problem
RFBUS failure (but this
should be ok if we’ve
gotten this far)
Propable cause:
Plenty of components involved. Go
thro
o
ugh the whole “
WCDMA TX
p wer and transmit frequency
ok?”
to find reason.
Propable cause:
Poor solder/Faulty Vinku
A
