Phone Settings For Rx1900 Troubleshooting; No Rx Gsm1900 - Nokia NSM-9DX Troubleshooting Instructions

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CCS Technical Documentation

Phone settings for RX1900 Troubleshooting

RX- continuous mode

Channel 661

AGC value 5

+ signal generator feeds –55 dBm to antenna pad

1 Check 26 MHz VCTCXO at TP20 (Test Point 20). Frequency deviation should be

<100

Hz). Check also TP3: Voltage should be 2.8VDC.

2 Check RX signal level 1960 MHz at TP31. If not OK, change Z500

3 Check RX signal level at TP32. If not OK, change Z520.

4 Check RX signal level at TP33. If not OK, check voltages at TP33 2.7 VDC, TP34 2.7

VDC, TP35 0VDC. If TP 33 not OK, check L550 and R550. If components are OK,

change V550. If that doesn't help change HAGAR N600.

5 Check RX signal level at TP36. If not OK, change Z551.

6 Check RX IQ signals at TP37 (also in burst-mode). If not OK, check HAGAR supply

voltages at TP4, TP5, TP6, TP8: 2.8VDC. TP10 1.35VDC and TP1 4.8 VDC. If the

voltages are not OK, change UEM.

7 Check SDATA at TP51, SCLK TP53 and SLE TP52.

8 Check frequency of VCO G650 at TP40 (3920 MHz/ CH661, RX cont mode). If not

OK, check TP7 2.8 VDC and TP41 ~2.9VDC. If TP41 is 4.8 VDC, the VCO doesn't

probably work. If all HAGAR input signals are OK, then HAGAR is probably broken

-> change Hagar N600.

9 If all signal and voltage levels are OK -> change UEM.

Issue 1 10/02

¤Nokia Corporation

RF Troubleshooting Instructions

Page 59

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