Sanyo CDP-150 Service Manual page 7

i
CD MECHANISM ADJUSTMENTS
c. CHECKING THECD MECHANISM
(a)
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(b)
(1)
(2)
T
- –113
Checking the operation of the CD mechanism
Disconnect the sled motor socket from the printed-circuit
board.
Apply a voltage of DC 0.7 V to the sled motor's
terminal.
Measure the current during sled motor operation.
.T'he direction of movement of the pick-up (outer groove or
inner groove) can changed by changing the battery polarity.
The current during sled motor operation varies
according to the positional relationship of gears
(11 Oandll l).
If the current exceeds 20-50 mA , remove the
gear (lll)andgear(ll O).
Apply a small amount
of a FLOIL ( G-474B ) bonding
materials to the chassis shafts.
Install the gears as shown in the illustration.
G-
a
& -110
g B
0
–111
s
0
–112
Direction of pick-up movement
Sled motor current
I
I
Outer groove
I
20-50 mA
I
I
Inner groove
I
20-50 mA
I
Resetting the pick-up to the home position
The LIMIT switch is switched ON by the projection of the
rack gear secured to the returned pick-up, after which the
sled motor continues to operate (by the circuit) for
approximately
20 - 30 milliseconds ; there is then again a
reverse operation, and movement to the position at which
the switch is switched OFF.
Rotation continues
for about 20- 30
milliseconds after the
switch is switched OFF,
and then
the pick-up stop at
home
position.
o
112
111
109 ( LIMIT SWITCH)
-6-
,