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Nokia Customer Care
RM-1
RF Troubleshooting
Company Confidential
Copyright © 2004 Nokia. All rights reserved
7A - 24
Issue 1
3.1.1.1.1 RF operating voltage VBAT_ASIC?
• Measurement can be done with an oscilloscope and a probe.
• Connect the probe to C7503 (or C7501, C7541)
• VBAT_ASIC voltage level should be 3.05 – 5.4 V. Typical value is 4.0 V.
3.1.1.1.1.1 Ferrite inductor L7503 ok?
• Check that component is in place and solder joints are ok
• Measure voltage from the both ends of L7503. Is it faulty or is there short circuit in RF end?
• Disconnect the power supply from the phone and use an ohmmeter to check that inductor
is conducting DC.
3.1.1.1.2 RFBUS signals ok?
• GSM receiver has to be active before RFBUS signals can be measured. Procedure is
explained in chapter “GSM RX chain activation for manual measurements”. Also
WCDMA/GSM transmitter and WCDMA receiver activation can be used for the measurement
but then RFBUS -signals don’t necessarily look like in figures mentioned below.
• Measurements can be performed with an oscilloscope and a probe. Check all five RF BUS
signals:
- RFBUSDAT: Connect the probe to J7504. Typical RFBUSDAT -signal is shown in section 6.5.9.3
“
RFBUSDAT (GSM RX)”
- RFBUSCLK: Connect the probe to J7505. Typical RFBUSCLK -signal is shown in sections 6.5.9.1
“
RFUSCLK (GSM RX)” and 6.5.9.2 “RFBUSCLK and RFBUSENA (GSM RX)”
- RFBUSENA: Connect the probe to J7506. Typical RFBUSENA -signal is shown in section 6.5.9.2
“
RFBUSCLK and RFBUSENA (GSM RX)”
- RXRESETX: Connect the probe to J7515. RXRESETX -signal is a constant 2 V DC-signal after
GSM or WCDMA transceiver has been activated the first time after phone boot up. The level
of this signal should be about 0 V before transceiver activation.
- TXRESETX: Connect the probe to J7517. TXRESETX -signal is a constant 2 V DC-signal after
GSM or WCDMA transceiver has been activated the first time after phone boot up. The level
of this signal should be about 0 V before transceiver activation.
3.1.1.1.2.1 RAP3G (or Vinku or Hinku) faulty?
• RAP3G (D2800) can not be replaced