Sony UP-895, Service Manual

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4-12
UP-895/(E)
4-4-10. Control of Memory and Head Control Circuit
A system control transfers operation mode data in serial to the memory and head control circuit (IC501).
It then instructs the start and end of the fetch operation (that fetches a video signal to memory) and copy
operation (that feeds the memorized image to the head). The copy operation is carried out when the
COPY key is pressed. The fetch-to-copy operation is carried out when the PRINT key is pressed.
[Fetch mode]
[Copy mode]
nPRINT_KEY
GADATA
DCLK
nREGEN
nFETCH
nFETCHIN
nFETCHSTOP
nCOPY_KEY
GADATA
DCLK
nREGEN
nCOPY
nCOPYING
nCOPYSTOP
Operation mode data
Transfer CLK
During capture
Capture end
Capture start
Operation mode data
Transfer CLK
Copy start
During copy
Copy end