Receiver Troubleshooting; Introduction To Receiver (Rx) Troubleshooting - Nokia 2700c-2 Service Manual

Error code
ST_IQ_POWER_TOO_SMALL
(0x00, 0x10)
ST_IQ_POWER_TOO_HIGH
(0x00, 0x20)
ST_CDSP_RF_SUPPLY_TEST is fatal
This test is checking internal voltage regulators.
Error code
ST_VREG_LDO2 (0x20, 0x00)
ST_VREG_VCCXO (0x80, 0x00)
Or combination (0xA0, 0x00)

Receiver troubleshooting

Introduction to receiver (RX) troubleshooting

RX can be tested by making a phone call or in local mode. For the local mode testing, use Phoenix service
software.
Page 4 –14
In Phoenix: Testing→ GSM→ RF Controls→RX
Apply -80dBm signal at 948.06771 MHz
Probe during RX operation:
1 J2810 RXIP [7]
2 J2811 RXIN [8]
3 J2812 RXQP (Ch1) [9]
4 J2813 RXQN [10]
5 J2814 ADC_ref [11]
Check voltage level between 0.7-0.8V
The result should look like this:
Figure 22 Frequency ~ 100kHz
Check
1 VCCXO value at testpoint E2909 = 2 .4 – 2.6 V
[12]
2 2. VBat = 3.0 – 4.7 V
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Test
Test
RM-561
RF troubleshooting
Action
All OK : go to BB
troubleshooting
NOK: replace N1001
Action
All OK: replace N1001
NOK : go to power
troubleshooting
Issue 1