Sanyo MCH-900F Service Manual page 18

i
I
REPLACING THE PRINCIPAL PARTS OF THE CD CHANGER MECHANISM
a. SENSOR P.C. BOARD LAYOUT DIAGRAM AND ITS APPLICATION
. The CD changer mechanism employs four sensor
P.C.
boards.
d
. Observe the following precautions to prevent sensor malfunctions.
(1) Mount light-emitting and light-receiving
elements on the
P.C.
boards in their correct positions.
Make sure such parts are not tilted or loose.
r
u
1
DISC CASE ELEVATOR
SENSOR ,PC.B (315)
I
"sC;Y;:;
PI+ :%:.
1
J
w PHOTO SENSOR
0.2mm or"more 7VT
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Detects whether disc is I * DISC CASE
present or absent
(363).
Detects chucking errors
La@as!
Should be parallel to P.C. board
.... .. . . ... .. .. . . . .. . .. .. . . . ... .. .. . .. ... .. .. .
—
M
~The height of the P.c. board !
r-+,
; must be adiusted.
mTiF
>
E%
-+wi%':.'i'%'?'
Should not be loose
%L-.._xxYA\\
/1'
v v LCD CHANGER CONNECTOR
\.
'-/
.. -
_
'L
.. . . . ...- #
/-"
(434)
PHOTO
SENSOR
DISC SENSOR
P.C.B
LOADING PLATE
"LOWER" (345)
/ ~
LOADING PLATE
SENSOR P.C.B(304)
h
\+
o,2mm or more~~
~+ LOADING PLATE
II
SENSOR I?C.B (304)
,. -.. .
"' "+~ O.lmm or more
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F-
—
No.
304
345
450
315
P.C.BOARD NAME
I
DESCRIPTION
LOADING PIATE SENSOR P.C. B
DISC
SENSOR P.C. B "LOWER"
DISC SENSOR P.C. B "UPPER"
DISC
CASE ELEVATOR
SENSOR P.C.B
. Detects the loading status by monitoring the
movement of the loading plate (434).
Tks.e sensors detect the following conditions on
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
position (PCOO1 ).
. Detects when DISC CASE is in RESET position
(s001).
Detects when loading plate (434) is in RESET
position (S002).
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