Transmitter Section - Samsung SCH-3500 series Service Manual

Trouble Shooting

8-3 Transmitter Section

Abnormal
Transmitter section.
NO
Check U501
TX IF Level OK?
AMPS:-12dBm
PCS:-24 dBm
Check
YES
U406(PCS), U407
(AMPS) RF out
Level OK?
AMPS:-6dBm
PCS:-37 dBm
YES
Check U409
NO
(PCS) U408(AMPS) RF
Out level OK?
AMPS:+5dBm
PCS:-17dBm
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NO
NO
Check PLL OK?
8-9
YES
Check U407(AMPS)
U406(PCS)
local level.
AMPS:-2dBm
PCS:-3dBm
Check U412(PCS)
YES
U411(AMPS)
Pout level.
AMPS:25dBm
PCS:-5.1dBm