Appendix A: RF Troubleshooting
Nokia Customer Care
Company Confidential
Copyright
©
2005 Nokia. All rights reserved
A-17
2.6 RX PLL phase lock self test (ST_CDSP_RX_PLL_PHASE_LOCK_TEST)
RX_PLL_LOCK_TEST (79) tests the functionality of RX PLL. If this fails, none of the RX related
measurements cannot be trusted.
Tested signals: VBAT_ASIC, VDIG, VR1, VR1RX, VCP1, RFBUSDAT, RFBUSCLK, RFBUSENA, RXRESETX
Error code for this self test is given in format:
•
0xyy, 0xzz
,where 0xyy, 0xzz part is the total error code:
0xyyzz
Hinku PLL
not locked
(0x0004)
ST_CDSP_RX_PLL_PHASE_LOCK_TE
ERRORS
YES
NO
Any other code
YES
Propable cause:
Test problem
RFBUS failure (but this should
be ok if we’ve gotten this far)
It’s not possible
to
get here
…
NO
Is
there
RF
power
at VCO
output?
YES
NO
YES
NO
Propable cause:
Poor solder/ Faulty Hinku
Other possible reasons:
VCP line shorted to ground
Propable cause:
Poor solder/Faulty VCO
Is
RF
power
at Hinku
in ut?
there
p
YES
NO
Propable
cause:
Poor solder/Faulty
balun
Is ere
ENOUGH RF
power
at Hinku input?
th
YES
NO
Is t e
Frequency correct
?
h
YES
Propable
cause:
correct freq and
Hinku says it’s
not locked then
change Hinku
NO
Is the VCP voltage ok?
YES
NO
Propable
cause:
Poor solder/Faulty RETU
Propable
cause:
Go through this and this link
if no help then
change
Hinku
, if still
not working change VCO
ST_CDSP_RX_PLL_PHASE_LOCK_TE
ST
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
Hinku PLL not locked
(0x0004)
Any other code
It’s not possible to get
here…
Is t ere RF power at
VCO output?
there RF power at
Hinku input?
there ENOUGH RF
power at Hinku input?
I he RX VCO frequency
correct?
Is
CP1 voltage ok?
Propable cause:
Test problem
RFBUS failure (but this
should be ok if we’ve
the V
gotten this far)
Propable cause:
Poor solder/Faulty Hinku
Other possible reasons:
VCP line shorted to ground
Propable cause:
Poor solder/Faulty RETU
Propable cause:
Go through “
Are
omponents near the RX
VCO ok?”
and “
RX VCO
c ntrol voltage VC ok?”
link
f no help then change
Hinku, if still not working
change VCO.
Propable cause:
Correct frequency and Hinku
says it’s not locked then
change Hinku
Propable cause:
Poor solder/Faulty balun
Propable cause:
Poor solder/Faulty VCO
there supply voltage for VCO?
If VR1RX is OK then the problem is
VCO, otherwise Hinku is faulty. (VR1
is routed through Hinku to VCO)
Propable cause:
Balun or VCO
Is
o
i
c
s t
Is
Is
h
