ViewSonic N3260w-1NT Service Manual page 12

Antenna Circuit:
• Tuner FQ1236F receive the signal coming from CATV or antenna RF NTSC signal and demodulate image
composite signal (signal mark TV 1) and audio medium frequency signal (signal mark SIF1).
• Image composite signal (signal mark TV 1)
• Image composite signal enter Video SW IC AV BOXU1 MM1630 PIN 17 and switch with other input
signals in U1 inner switch circute .Output from PIN 60 (signal mark CYOUT2) than via Q38 Video buffer (signal
mark CVBS_EX) and enter U38 Scaler IC EX-52 (Pin 242) directly. Switches with other input signals in
U38 inner switch circute.
• Audio medium frequency signal (signal mark TV-S), transmits U3 CAX2104S to demodulate audio IF and
stereo.Then switches signal source with other Audio Source in U4 MM1631 Audio S/W.PIN 29,30 outputs via
Q25,Q26 Audio buffer to U49 SRS TA2136F , transmits to U39 AN5891K then enter D-amplifier U17 TPA3004
output.
ViewSonic Corporation
11
Confidential - Do Not Copy
N3260w_N3760w_N4060w
-1NT
N3260wb_N3760wb