Technics SL-PS900 - Fine Tuning and Playback Verification; Best Eye Adjustment and Playback Checks

SL-PS900
(3)
BEST
EYE
(PD
BALANCE)
ADJUSTMENT
:
4.
Connect
the
oscilloscope’s
CH.
1
probe
across
rernes
AN
(RF) and (GND) on the servo P.C.B.
(Refer to Fig. 3 on page 15)
Oscilloscope setting: VOLT ................... 200mV
SWEEP... 0.5ps.
Input coupling......AC
2. Switch the player power ON, and play the 1 kHz (track
1) on the test disc (SZZP1054C).
3. Adjust VR101 until the vertical fluctuation of RF
signal is minimized and the eye pattern is most
stretched. (Refer to right figure)
« Most stretched eye pattern.
J
$$$
(4) CHECK OF PLAY OPERATION AFTER
ADJUSTMENT
* Checking Skip Search * Checking Playability
1. Play an ordinary musical program disc. 1. Play the 0.7mm black dot and the 0.7mm wedge on
2. Press the skip button to check for normal skip the playability test disc (SZZP1054C) and verify that
search operation (in both the forward and reverse no sound skip or noise occurs.
directions). 2. Play the middle tracks of the uneven test disc
(SZZP1056C) and verify that no sound skip or noise
* Checking Manual Search occurs.
1. Play an ordinary musical program disc.
2. Press the manual search button to check for smooth
manual search operations at either low or high
speed (in both the forward and reverse directions).