THOMSON VK231PS, Technical Manual

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76
PAUSE, FRAME-BY-FRAME, AND SLOW MOTION
During these functions, Video Heads 2 are in operation. They read only Tracks 2 (-6°).
PAUSE
When this function is requested, Microcontroller IT001 stops the capstan. A braking pulse
(5 Vpp) is sent to the capstan motor. 150 ms later, the capstan motor is placed in forward
rotation mode for 20 ms. At the end of this cycle, Microcontroller IT001 seeks a control signal
rising edge (reference Track 1). A few milliseconds after this rising edge (the exact time
depends on the phase control), capstan motor braking is performed.
LD1 ( +6
°
)
LD2 ( -6
°
)
N1 ( +6
°
)
N2 ( -6
°
)
2L
TRACK 1
T
2,6V
46 IT001
CTL PULSE
9 BT001
VM CAP.
53 IT001
FWD. / REV.
5V
5V
0
PAUSE
PULSE
5ms
20ms
5V
0
0
2,6V
5V
4V
5V