Nokia 6680 RM-36 Service Manual page 298

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RFBUSCLK: Connect the probe to J7505. Typical RFBUSCLK -signal is shown in section
-
"RFBUSCLK (GSM RX)"
RFBUSENA: Connect the probe to J7506. Typical RFBUSENA -signal is shown in section
-
"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.
3.2.2.2.1 RAP3G (or Vinku or Hinku) faulty?
RAP3G (D2800) cannot be replaced.
•
3.2.2.3 Hinku (N7500) regulator voltage VR1 ok?
• GSM receiver has to be active before Hinku's VR1 voltage can be measured. Procedure is explained
in section "GSM RX chain activation for manual measurements".
• Measurements can be done with an oscilloscope and a probe.
• Connect the probe to C7504 (or C7505)
• VR1 voltage level should be 2.65 – 2.86 V. Typical value is 2.7 V.
3.2.2.3.1 Hinku (N7500) RB_EXT voltage ok?
• GSM receiver has to be active before Hinku's RB_EXT voltage can be measured. Procedure is
explained in section "GSM RX chain activation for manual measurements".
• Measurement can be done with an oscilloscope and a probe.
• Connect the probe to R7504.
• RB_EXT voltage should be 1.325 – 1.375 V.
3.2.2.3.1.1 VREFRF01-voltage ok?
• Measurement can be done with an oscilloscope and a probe.
• Connect the probe to R7503.
• VREFRF01 voltage should be 1.325 – 1.375 V. Typical value is 1.35 V.
3.2.2.3.1.1.1 Desolder R7503. Is VREFRF01 voltage still wrong?
Remember to solder a new component to R7503 pads after measurement.
3.2.2.3.1.1.1.1 Capacitors C7518, C7520 and C7570 working correctly?
A-52
and 6.5.9.2 "RFBUSCLK and RFBUSENA (GSM RX)"
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Appendix A: RF Troubleshooting
6.5.9.1
6.5.9.2