Toshiba TW40F80 - Manual (Page 35)

35
2. OUTLINE
In this model, the DVD input terminals are provided in or-
der to receive the color difference signals (Y, Cr, Cb) out-
put from a DVD player.
The luminance (Y) signal input for DVD input uses the
VIDEO input terminal in common with the VIDEO 2 input.
The terminals for color difference signal inputs Cr (R – Y)
and Cb (B – Y) are used exclusively.
The input identification for VIDEO 2 and DVD is carried
out by setting pin 21 of QV01 TA1218N (AV SW IC) from
“L” to “H” when the cable is connected to the Cb input ter-
minal with a switch equipped.
The main microprocessor QA01 sets pin 10 of QA01 from
“L” to “H” through I 2 C bus when pin 21 of AW SW IC
develops “H”.
Cb input
Open : at Cb input
RV26
75
RV27
10k
RV28 100k
+9v
Cb to DVD SW unit
21
QV01 TA1218N
Fig. 4-2