VC-MH85 (serv.man4). Trouble shooting guide - Sharp VCR Service Manual (repair manual). Page 6

No picture E-E signal. (by pass)

Is picture signal input into the pins(31) and (32) of IC201?

Check the line between pin(24) of TU101 and pin(31) of IC201.
Check the line between external video input terminal (J201) and 
pin(31) of IC201.
Check the line betweem video input terminal and pin(28) of IC201.

Is picture signal outputted to the pin(52) of IC201?

Check the line between pins(63) and (62) of IC201 
and all the way up thru to pins(84) and (85) of IC701.

Is picture signal output to the emitter of video output buffer 
(Q251)?

1

 Line output: Check video output buffer(Q251) peripheral and output terminal periphery.

2

 RF output: Check video output buffer(Q251) peripheral and video input terminal of RF converter periphery.

Is supply voltage of 5V(Y-Vcc) fed to the pin(12) of IC201?

Check the PC 5V line.

Is there Y/C serial data and Y/C signal clock applied 
to the pins(63) and (62) of IC201?

Check peripheral circuit of Q251.