Nokia Mobile Phones NSE-5 Series Service Manual page 253

PAMS
Technical Documentation
Fault finding chart for PCN receiver
Oscilloscope
SUMMA N700 pin 41
SUMMA N700 pin 35
CRFU3 N600 pin 8, 47
CRFU3 N600 pin 13, 33 VRX_1
Spectrum analyser
Verify 500 ohm passive
probe
Measure between Me-
chanical Switch (X501)
and Diplexer (Z503),
Pin = –55 dBm,
1842.8 MHz
Spectrum analyser
CRFU3 N600 pin 34
Pin = –57 dBm,
1842.8 MHz
Spectrum analyser
CRFU3 N600 pin 38
Pout = –39 dBm,
1842.8 MHz
Spectrum analyser
CRFU3 N600 pin 42,43
Pin = –48 dBm,
1842.8 MHz
Issue 1 07/99
VREF Vdc = 1.5 Volt
VRX_2 Vdc = 2.8 Volt
VSYN_2 Vdc = 2.8 Volt
Vdc = 2.8 Volt
Yes
Yes
Yes
Yes
Yes
NSE–5
Troubleshooting
Check
No BaseBand
Check
No Spectrum analys-
er, probe and sig-
nal generator
Check
Diplexer (Z503)
No TX/RX Switch
(Z504)
PCN Filter (Z501)
Check
CRFU3 (N600)
No pin 24, BandSelect
pin 28, FraCtrl
Check
No PCN Filter (Z602)
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