Tx Pll Phase Lock Self Test (St_Cdsp_Tx_Pll_Phase_Lock_Test) - Nokia 6680 RM-36 Service Manual

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2.7 TX PLL phase lock self test (ST_CDSP_TX_PLL_PHASE_LOCK_TEST)

TX_PLL_LOCK_TEST (80) tests the functionality of RX PLL. If this fails also the TX power tests will fail.
Tested signals: VBAT_ASIC, VDIG, VR1, VCP2, RFBUSDAT, RFBUSCLK, RFBUSENA, TXRESETX
Error code for this self test is given in format:
0xyy, 0xzz
•
,where 0xyy, 0xzz part is the total error code:
I there RF power at s
Is there RF power at VCO
VCO output?
output?
I there RF power at s
Is th ere RF power at Vinku
Vinku input?
input?
Is there ENOUGH RF
Is there ENOUGH RF power
power at Vinku input?
at Vinku input?
Is t he TX VCO frequency
Is the Frequency correct ?
correct?
A-18
Vinku PLL not locked
Vinku PLL not locked
(0x0004)
(0x0004)
YES YES
NO NO
Is there supply
Is there supply
voltage for VCO?
voltage for VCO?
(VINKU VREG2)
YES YES
YES YES
NO NO
YES YES
Propable cause:
Propable cause:
Poor solder/Faulty balun
Poor solder/Faulty balun
NO NO
Propable cause: Propable cause:
Balun or VCO
Balun or VCO
YES YES
NO NO
Propable cause:
Propable cause:
YES YES
correct freq and Hinku says it's
Correct frequency and Hinku
not locked then change Hinku
says it's not locked then
change Hinku
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0xyyzz
ST_CDSP_TX_PLL_PHASE_LOCK_TE ST_CDSP_TX_PLL_PHASE_LOCK
ERROR
ST
NO NO
Any other code Any other code
YES YES
Propable cause:
Poor solder/Faulty Vinku
Propable cause:
Other possible reasons:
Poor solder/ Faulty Vinku
(This should have already
(This should have already
failed in earlier tests)
failed in earlier tests)
NO NO
Propable cause:
Propable cause:
Poor solder/Faulty VCO
Poor solder/Faulty VCO
Is the VCP2 voltage ok?
Is the VCP voltage ok?
YES YES
Appendix A: RF Troubleshooting
It's not possible to get
It's not possible to
NO NO
here...
get here ...
Propable cause:
Test problem
RFBUS failure (but this
should be ok if we've
gotten this far)
Propable cause:
Propable cause:
Poor solder/Faulty RETU
Poor solder/Faulty RETU
Other possible reasons:
Other possible reasons:
VCP line shorted to ground
VCP line shorted to
ground
NO NO
Propable cause:
Propable cause:
Check the loop components/
Check the loop
solder joints, if no help, change
components/solder joints, if
Vinku . If still not working, change
no help, change Vinku. If
TX VCO
still not working, change TX
VCO.