Dcs Receiver - Samsung SGH-T100 Service Manual

5-14 DCS Receiver

RF input : CH center freq. + 67.7 kHz
Pin 24, 25, 26, 27
Pin 32,33 °√ 2.5 V
Flow chart of Troubleshooting and Circuit Diagram
Rx On
Amp. : -50 dBm
U706
No
Pin 8
°√ -65 dBm
Yes
U706
Pin 10
°√ -65 dBm
Yes
F602
No
Pin 5
°√ -70 dBm
Yes
F601
Pin 3
°√ -60 dBm
Yes
U601
No
Pin 2, 3
°√ -60 dBm
Yes
U601
Pin 49, 50
(225 MHz)
°√ -50 dBm
Yes
U601
No
Pin 43, 44
(45 MHz)
°√ -55 dBm
Yes
U601
No
°√ 40 mV
Yes
Check U601
No
Pin 35 °√ 2.5 V
Yes
Resolder
U400
Check RF connector
-> resolder
Resolder &
No
U706 Pin 1
°√ -65 dBm
Yes
Resolder
F602
Resolder
C630, L611, C619
L612, C650
Resolder
F601, C626, L607
Check
C504(CH-225MHz)
No
°√-20 dBm
C510(1080MHz)
°√ -20 dBm
Resolder
F604,C607,C611,C608
C613,C605,C609,R601
Resolder
OneC(U400), U601
Resolder
U601 (Pin 35, Pin 32, 33)
Check
No
VC1 : L
VC2 : L
No
Resolder
Yes
U501
5-21