Samsung DVD-V642K, Руководство по обучению

Страница: 73 / 164

Circuit Operating Descriptions
7-15
Fig. 7-17 Clock Control and Power Failure Detection
C624
C625
R657
IC608
7042
C688
14
16
15
85
86
1 2 3
61
BACKUP DET
AL5.8V
BUSY
D692
D620
(27) 4H’D Control
During trick play (Still, Slow, F-Advance), it is necessary to control pre-amp, Video circuit.
The Micom control pin 29 (C-ROTARY), pin 30 (HD-AMP) of the IC601 during PB period in Slow mode.
These port is applied to Video IC to operate the trick play.
(24) Timer/OTR Control
The timer can preset 6 programs in one year including daily and weekly programs.
Express recording lets the operator record up to 9 hours without programming the timer.
(25) Clock Display
The clock generator inside of the u-COM counts the oscillation signal of XT601 for the timer clock data.
(26) Power Failure Detection
u-COM goes to the power failure mode when the 61 port is lower than 4/5 of AD Vcc level.