Sega CD II - Feed Circuit Flowchart

8-4. Feed Circuit Flowchart
Are IC403-®>!© 5V and
IC409-<1)/@/@9V?
YES
Can the TOC be read?
YES
Can each track
be searched?
NO
Does the following waveform
appear at
IC403-® during search?
Searcb outer edge Search inner edge
Vref _I''lnJ- -- ~JUI-
YES
Does the following waveform
appear berween IC409-
® and @
during search? NO
Searcb outer edge Searcb inner edge
ovI'lfUt--- ~~
YES
Check the feed motor and its
connections.
----- - ----
JI~\~
'c '-i. 0 \ {~ ·
14
-t '
I ..
Check the feed circuit (IC403).
Check the path berween IC403-
@
and IC409-@.
' .
o·· :~-: · . ' *,
:·" !
Does IC403-® (SSTOP) change YES
from 5V to
OV when SW501
(P.U SW)
is set to ON from OFF?
NO
Check the coMection bcrwccn
SW501 and
IC404-@ .
YES
Check that the following pins are~ .
IC403 IC404
@ @
~ ®
@ ®
® ~
IC403-@1. i:.- lf
IC404-@J J .
/l '-r-C 3 - l. '-
'' '+cc.,. - l.O