Samsung VP-L900 Training Manual page 102

PG Signal
FG Signal
Head Switching
Signal
Vertical sync
pick-uped
from tape
TBC counter
play mode result
Standard it does the head switching which is regulated from play mode.
The micom records 6.5H Interval.
Samsung Electronics
Cylinder
! @ #
a
b
6.5H
NTSC:63.5556*6.5=413.1115us
PAL :64*6.5
Fig. 6-19 Drum phase control from recording mode
PG
$ % ^ & *
CH1
=416us
Circuit Operating Description
Detector
Tape
( ) 1 2
CH2
6-23