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CD ADJUSTMENTS
c. ADJUSTMENTS
Adjustment
Measuring
service
output
Adjustment
Adjustment
Item
instrument
mode
connection
location
value
(a) Tracking
Oscilloscope
yes
TE
VR131
Waveform symmentry
balance
L.P.F
Vc
A=B
(b) Checking the
Oscilloscope
-
ICI 31(23Pin): RF
-
Checkbe surethatthe "eye"patternis at thecenterof
"eye"
pettern
Vc
the wavefom and that the diamond shape is clearfy defined
(a) TRACKING
BALANCE
ADJUSTMENT
(1) Connect the oscilloscope to TE and VC.
(2) Set the test disc.
(3) ~qrn open closing switch on PWBASSY(S151
3) into an open
state, and does DC power supply in on while pushing STOP
Key(Sl 501) and ANTI-SHOCK
Key(Sl 507) simultaneously,
and confirms that all segments of LCD become indcation state.
(Establishes a microcomputer in movement test mode)
(4) Pushes the first time and pushes PLAY state and the second
time and becomes rough servo state.
(5) Turn onPWBASSYVR131
with a driver for adjustment slowly
from side to side, and adjusts it as wave pattern of "TE"
becomes symmetric top and bottom.
- (b) CHECKING
THE
"EYE" PAlTERN
(1) Connect the oscilloscope to IC131 (pin23) (RF) and (VC).
(2) Switch "ON" the POWER.
(3) Load the test disc.
(4) Press the PLAY button.
(5) Check to be sure that the "eye" pattern is at the center of
waveform and that the diamond shape is clearly defined.
(6) Press the STOP button.
(7) Switch "OFF" the DC POWER.
(d) Focus adjustment
(1)
Pushes PLAY key(Sl 502) once and play.
(2) Record an indicator value of voltmeter.
(3) Pushes STOP key(Sl 501) and stop.
(4) Stops PWB ASSY VR132
by the time while reading an
indicator value of a voltmeter
it became it with right and
left slow gang bang, V1 -V2 < 5mV with adjustment driver.
(5) Switch "OFF the DC POWER.
RF
AC
TE
3
Ov(vc)
A
B
DED
b
-5-
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