Receiver Section - Samsung SCH-811 Service Manual

6-2 Receiver Section

6-2-1 FM mode
Start FM mode
Check FM 12dB
SINAD OK?
Yes
6-7
No
Check LNA
in/output OK?
Gain: +16dB
Yes
Check RF amp
in/output OK?
Gain: +17dB
Yes
Check mixer
in/output OK?
Gain(FM): -8dB
Yes
Check IF filter
in/output OK?
Loss: -5dB
Yes
Check AGC amp
in/output OK?
Gain: +, -45dB
Yes
RF Rx FM OK
BBA INPUT: -54dBm
No
Check Duplexer
& LNA power
Yes
No
Check 1st
local & mixer power
OK?
No
Check IF filter
soldering
Yes
No
Check 2nd
local & AGC control
voltage OK?
SAMSUNG Proprietary-Contents may change without notice
No
Check PLL (U306)
& VCO output
969.96MHz
local: -4~0dBm
VCO_OUTPUT: -10dBm
No
Check PLL
& BBA #80
170.76MHz