Nokia RM-555 Service Manual page 156

• Tests the functionality of N7500 bias block, regulators, reference voltage line and, supply connections.
• If these fail, all other N7500 tests can/will fail.
3 ST_CDSP_TX_IQ_TEST (85)
• Test checks that the TXIQ lines between BB and N7500 are properly connected.
• If this fails also power tests and RXIQ loopback will fail.
4 ST_CDSP_TXC_DATA_TEST (74)
• This tests that the TXC line between AVILMAS (N2200) & Vapaus (N7500) is properly connected.
• If this fails TX power tests will also fail.
5 ST_CDSP_RX_PLL_PHASE_LOCK_TEST (79)
• Tests the functionality of RX PLL.
• If this fails none of the RX related measurements can be trusted.
6 ST_CDSP_TX_PLL_PHASE_LOCK_TEST (80)
• Tests the functionality of TX PLL.
• If this fails the TX power tests will also fail.
7 ST_CDSP_TX_WCDMA_POWER_TEST (75)
• Checks the output power of the WCDMA transmitter.
8 ST_CDSP_RX_IQ_LOOPBACK (81)
• Tests that the RXI lines and VREFCM line between BB and N7500 are connected.
9 ST_CDSP_TX_GSM_POWER_TEST (77)
• Checks the output power of the GSM transmitter.
To get the best out of these instructions you need to be have the valid schematics at hand.
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RM-555
RF Troubleshooting
Issue 1