REPLACE ME NT OF CD MECHANISM
6. Resetting the pickup to the home position
(l) The Iimlt switch is switched ON by the projection of ttlis
rack gear secured to the returned pickup, after
which Lhe
sieci motor continues to operate (by the circuit ) for ap-
proximately 30 rnsec. : there is then again a reverse opera-
tion, and m~vement to the position at which ttle switch is
switched OFF.
(2)
Rotation continues for about 30 msec. after the switch is
switched
OFF, and then the pickup stop at home position.
(
CONFIRM OF CD SECTION
1. Preparation
.
Measuring instruments and Test disc.
(l)TEST DISC :
YEDS 18 (SONY)
(2) OSCILLOSCOPE : SS5711 (10 MtHz and Dual Phenomenon)
NOTE : CD section of this un[t can not need adjustment, be-
cause CD P. W. Board checked at automatic check-
er.
2. Confirm of general operation
(1) Set the test disc.
(2) Press the PLAY button, then confirm [he disc rotating to
clockwise direction.
(3) Press the FFWD or REW button, then confirm the most in-
ner music or most outer music accessing at speedy.
(4) Press the STOP button.
3. Confirm of eye pattern
MAIN P.W. Board (Solder Side)
e,,
....
PIN58
>,~PIN &l
V
<=>
● Iclol
(l) Connect an oscilloscope to pin 41 (RF) of ICIO1 and J141O
(VR),
(2)Sct the test disc, press the PLAY button.
(3) Check to be sure that the “eye” pattern IS at center of
waveform and that the ctlamond shape is clearly defined.
(4) Press the STOP button.
IC101,PIN41
+
o
OSCILLOSCOPE
VR(J141O)
o
D
VOLT/ DIV-500mVl DlV
-7-
To Next Page
Loading...
