Sega CD II Service Manual page 10

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7. TOC (Total of Contents) READ-IN FLOWCHART
Focus operation timing
Focus drive signal at JC403 pin@
v~r ~i~,//
[5]
'
F~~iz~~~rI_Pc.:X~l
:
Vref
IC401 pin @
, ·'
[5]
Sense~~ = i _
[G]
Focused point
IC404 pin @or IC403 pin @
10
Focus~~
---------1
L______ _______
[6]
Broken lines show that focus is
not obtained.
[1] Power ON
[2]
Pickup moves to inner edge.
NO
[4]
LaserON
[5]
Focus search
[6]
Focus servo ON
- [7]
Make a disc rotate.
[8]
Tracking servo ON
[9]
Disc servo ON
[1 OJ
Reads in the TDC (disc data).
END
IC403pin@
Vrcf
SWS~I
ON [
3 ]
~
IC403 pin@
sv-1v
--SW501 ON
~~
- _ __ - _ _ -_ -L
[3]
IC402pin@
sv-1v
~~
________ ___!
Laser ON
[4]
IC403 pin Cl)
/\ /1
[5]
Vrcf--/
V '---
--~~':~~P_!:~~-~~~~~-~P-~-~-~~~~2-
IC403 pin@
Vrcf
--uf~.,//L_
__
[6]
IC403 pin@
vrcr Ji~8vl
__________ _ _
[7]
IC403 pin@
S..VoO'\.~
[BJ
IC403pin@
~50ms/~~!.
500ms/div.
IC401 pin@
[10)
SV ..-Starts reading data.
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