Sharp GX20 Service Manual - Page 98
] Waveforms of circuit
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GX20 [3] Waveforms of circuit CONFIDENTIAL RF UNIT PLL_IC SERIAL COMMUNICATION 1 TCXOEN (STAND-BY) IC304 1Pin 5 SYNTHDATA (STAND-BY) IC901 39Pin 2 RFON_B (STAND-BY) R351 (Q304 5Pin) 6 SYNTHEN (STAND-BY) IC901 35Pin 3 TXON_B (Talking) R352 (Q304 4Pin) 7 QTXN (Talking) C924 (IC901 22Pin) 4 SYNTHCLK (STAND-BY) IC901 37Pin 8 QTXP (Talking) C924 (IC901 23Pin) 5 - 2
GX20
5 – 2
CONFIDENTIAL
[3] Waveforms of circuit
RF UNIT PLL_IC SERIAL COMMUNICATION
TCXOEN
(STAND-BY)
IC304 1Pin
1
RFON_B
(STAND-BY)
R351
(Q304 5Pin)
2
TXON_B
(Talking)
R352
(Q304 4Pin)
3
SYNTHCLK
(STAND-BY)
IC901 37Pin
4
SYNTHDATA
(STAND-BY)
IC901 39Pin
5
SYNTHEN
(STAND-BY)
IC901 35Pin
6
QTXN
(Talking)
C924
(IC901 22Pin)
7
QTXP
(Talking)
C924
(IC901 23Pin)
8