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1) Outline
When FUNCTION ON is operated, power is supplied to
the microcomputer, thereby causing the AUTO LED to
light regardless of whether or not the video signal is pre-
sent,
Then, the microcomputer judges by means of PB 12V
that the mode is PB when the level is high, and EE when
the level is low. In the PB mode, detection of 50 Hz or
60 Hz is made automatically by counting AFC (H S
YNC) pulses occuring between one trailing edge and the
next trailing edge of the Switching Pulse.
In the PB mode, fixed setting to that mode may be made
by manual operation.
In the EE mode, detection of 50 Hz or 60 Hz is made
automatically by counting AFC (H SYNC) pulses occur-
ing between one leading edge and the next leading edge
of V SYNC (RS5 port).
In the EE mode, fixed setting to that mode may be
made by manual operation.
2) Change from EE mode to PB mode
When changing from EE to PB mode, the loading time
(2.6 seconds) is controlled by the internal timer via
* the microcomputer. This is the same as the loading time
by the power SYS CON (System control).
Service Manual VS-2EGN
Fig. 7-64 Auto Discriminator Block Diagram
55
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