Rx Pll Phase Lock Self Test (St_Cdsp_Rx_Pll_Phase_Lock_Test) - Nokia 6680 RM-36 Service Manual

Appendix A: RF Troubleshooting

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:
Is t ere RF power at h
Is there RF power at VCO
VCO output?
output?
Is there RF power at Hinku
Is there RF power at
in ut? p
Hinku input?
Is there ENOUGH RF
Is th ere ENOUGH RF power
power at Hinku input?
at Hinku input?
I he RX VCO frequency s t
Is t e Frequency correct ? h
correct?
Hinku PLL not locked
Hinku PLL not locked
(0x0004)
(0x0004)
YES YES
NO NO
Is there supply voltage for VCO?
If VR1RX is OK then the problem is
YES YES
VCO, otherwise Hinku is faulty. (VR1
is routed through Hinku to VCO)
NO NO
YES YES
Propable cause:
Propable cause:
Poor solder/Faulty balun
Poor solder/Faulty balun
NO NO
Propable cause:
Balun or VCO
YES YES
NO NO
Propable cause:
Propable cause:
Correct frequency and Hinku
correct freq and Hinku says it's
YES YES
not locked then change Hinku
says it's not locked then
change Hinku
Copyright © 2005 Nokia. All rights reserved
0xyyzz
ST_CDSP_RX_PLL_PHASE_LOCK_TE
ST_CDSP_RX_PLL_PHASE_LOCK_TE
ERRORS
ST
NO NO Any other code
Any other code
YES YES
NO NO
YES YES
Propable cause:
Propable cause:
Poor solder/Faulty VCO
Poor solder/Faulty VCO
Is the V CP1 voltage ok?
Is the VCP voltage ok?
Company Confidential
It's not possible to
NO NO It's not possible to get
get here ...
here...
Propable cause:
Propable cause:
Test problem
Test problem
RFBUS failure (but this
RFBUS failure (but this should
should be ok if we've
be ok if we've gotten this far)
gotten this far)
Propable cause:
Propable cause:
Poor solder/ Faulty Hinku
Poor solder/Faulty Hinku
Other possible reasons:
Other possible reasons:
VCP line shorted to ground
VCP line shorted to ground
Propable cause:
Propable cause:
Poor solder/Faulty RETU
Poor solder/Faulty RETU
NO NO
Propable cause:
Propable cause:
Go through this and this link Go through
if no help then
c omponents near the RX
YES YES
change Hinku , if still
VCO ok?"
not working change VCO
c ntrol voltage VC ok?" o
i f no help then change
Hinku, if still not working
change VCO.
Nokia Customer Care
"Are
and "RX VCO
link
A-17