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Trouble Shooting Guide, Advanced
The 175 MHz signal is mixed down to 6 MHz in N500.
Measure the signal 6 MHz at Z500 pin 6 ~0 dBm, Z500 pin 1 ~-7 dBm, N500 pin 44 ~-6 dBm,
N500 pin 40 ~-5 dBm.
If the signal is attenuated too much from N500 pin 44 to N500 pin 40, and then the fault
probably is due to L505 or C521, an alternative is C505 or C520.
Measure the DC voltage at C530 – C535, +2.1 V
.
DC
If any of them is lower, replace the corresponding capacitor.
If the attenuation in the signal path is correct, the fault can be due to disturbance in any of the
feed voltage or the control voltage to N302.
N301 or C318 usually causes disturbance on the control voltage.
The fault can also be due to N800, D600 or N500.
All values are approximate. Measure the exact values for your equipment using a phone
you know is working.
4/00021-3/FEA 209 544/18 B
36(121)
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