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SAMSUNG Proprietary-Contents may change without notice
6-7
Troubleshooting
6-3 FM Receiver Section
RX part
Check FM 12dB
SINAD OK?
Check LNA
in/output OK?
Check mixer
in/output OK?
Check IF AMP
in/output OK?
Check 1st
local & mixer power
OK?
Check IF AMP
power OK?
Check PLL (U504)
& VCO output
Check IF filter
in/output OK?
Check IF filter
solderling
Check 2nd
local & AGC control
voltage OK?
Check IFR(U304)
Soldering
RF Rx FM OK
Check Duplexer
& LNA power
Yes
Yes
Yes
Yes
Yes
Yes
IFR INPUT CDMA :-40dBm
FM : -26dBm
170.76MHz170.76MHz
CDMA : -16dBm
FM : -6dB
Gain(FM): +20dB
Gain(FM): -8dB
Gain: +20dB
VCO_OUTPUT: -4dBm
local: -2.3dBm
Yes
No
No
No
No
No
No
Power Level : -50dBm
DC Power Supply : 3.95V
CH:363
Summary of Contents for SCH 620
Page 75: ...9 Block Diagrams SAMSUNG Proprietary Contents may change without notice 9 1 9 1 Main Diagram ...
Page 77: ...SAMSUNG Proprietary Contents may change without notice 9 3 MEMO MEMO ...
Page 79: ...PCB diagrams Samsung Electronics 10 2 10 2 Main PCB Bottom Diagram ...
Page 80: ...PCB diagrams Samsung Electronics 10 3 10 3 CLC PCB Top Diagram 10 4 CLC PCB Bottom Diagram ...
Page 81: ...PCB diagrams Samsung Electronics 10 4 10 5 Hands free Kit PCB Top Diagram ...
Page 84: ...Samsung Electronics 11 3 Circuit diagrams 11 3 CLC Circuit Diagram ...
Page 85: ... Samsung Electronics Co Ltd APRIL 2000 Printed in Korea Code No GH68 00669A BASIC ELECTRONICS ...