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Troubleshooting
6-3 FM Receiver Section
RX part
Check FM 12dB
SINAD OK?
Yes
No
Check LNA
in/output OK?
Gain: +20dB
Yes
Check mixer
in/output OK?
Gain(FM): -8dB
Yes
Check IF AMP
in/output OK?
Gain(FM): +20dB
Yes
Check IF filter
in/output OK?
CDMA : -16dBm
FM : -6dB
Yes
Check 2nd
local & AGC control
voltage OK?
170.76MHz170.76MHz
Yes
RF Rx FM OK
IFR INPUT CDMA :-40dBm
FM : -26dBm
SAMSUNG Proprietary-Contents may change without notice
No
Check Duplexer
& LNA power
Yes
Check 1st
local & mixer power
OK?
local: -2.3dBm
No
Check IF AMP
power OK?
No
Check IF filter
solderling
No
6-7
Power Level : -50dBm
DC Power Supply : 3.95V
CH:363
No
Check PLL (U504)
& VCO output
VCO_OUTPUT: -4dBm
Check IFR(U304)
Soldering
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