Service manual

GTC Service Manual
ASUS Proprietary 48
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10.7 WCDMA TX
10.7 WCDMA TX10.7 WCDMA TX
10.7 WCDMA TX
Before repairing, please confirm one thing first. WCDMA RF
reference clock (26MHz) is offered by RF3000, so please check R800 to
be 26MHz first.
Then, we will analysis the component characteristic on TX path; The
signal will include its relative value. First of all, we probe into some
characteristics of WCDMA transceiver first. Its power parts are divided
into two parts: Analog (check R909 is 2.75V) and Digit (check R919 is
1.8V). In WCDMA TX part, both of I and Q channel are QPSK signal
(R921, R923, R925, and R929).
26MH