Sanyo MCH-900F Service Manual page 65

RE
a.
(1
?LACING THE pR~NclpAL PARTS OF THE CD cj+~Nf_JER
SENSOR P.C. BOARD LAYOUT DIAGRAM AND ITS APPLICATION
The CD changer mechanism employs four sensor P.C.
boards.
Observe the following precautions to prevent
sensor malfunctions.
. .
MECHANISM
.A4
Mount light-emitting and light-receiving
elements on the P.C. boards M their correct positions.
Make sure
such parts are not tilted or loose.
DISC CASE ELEVATOR
SENSOR ,PC.B (315)
I ! 1
T!!?!!J
DISC ~EW~;~fi ~
PHOTO
T
-1 ~
PHOTO SENSOR
SENSOR
0.2mm or mOre
Detects whether disc is
% D~3;3~ASE
present or absent
Detects chucking errors
J5_E@
' hou'dbepara''e'to'chard
1 1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
-!ijij :
; The height of the P.C. board ;
I must be adjusted.
. ... . . .. . . . .. .. . . . ... .. . . .. . . . ... . .. .. .. ... .. . ..
No.
304
345
450
ER CONNECTOR
(434)
PHOTO SENSOR
DISC
&
LOADING PLATE
..
)
\f-
-fI
r
LOADING PLATE
().2mm or more
SENSOR I?C.B (304
315
nnm
Should not be loos
+~
II
O.lmm or more
u
P. C. BOARD NAME
DESCRIPTION
LOADING PLATE SEN50R P.C. B
. Detects the loading status by monitoring the
movement of the loading plate (434).
DISC SENSOR P.C. B "LOWER"
These sensors detect the following conditions on
DISC SENSOR P.C. B "UPPER"
SENSOR P.C. boards 345 and 450.
. Disc present or absent (PCO02/PCO03)
Chucking error (S005)
Detects whether DISC CASE is in UP or DOWN
DISC CASE ELEVATOR
position (PCOO1 ).
SENSOR P.C.B
Detects when DISC CASE is in RESET position
(s001).
. Detects
when loading plate (434) is in RESET
position (S002).
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