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'SL-PD687
IEMEASUREMENTS AND ADJUSTMENTS
Warning:
This product uses a laser diode. Refer to caution statements on page 2.
ACHTUNG:
« Die lasereinheit nicht zerlegen.
* Die fasereinheit darf nur gegen eine vom hersteller spezifizierte einhelt ausgetauscht werden.
Measuring Instruments and Special Tools
* Test discs
Allen wrench (M2.0) (SZZP1101C)
1. Playability test disc (SZZP1054C)
* Lock paint (RZZOLO1)
2. Uneven test disc (SZZP1056C)
% Musical program disc (ordinary)
% Dual-beam oscilloscope with bandwidth of 30MHz
'or better (with EXT. trigger and 1:1 probe).
PREPARATION
1, Remove
the cabinet and front panel ass'y (refer to
"disassembly instructions" Ref. No. 1, 2).
2, Set the power switch to ON and press the open/
close key to close the loading drawer.
3. Press the play key
and when the traverse deck
reaches it's height position, set the power switch to
OFF.
4, Remove the tray ass'y (refer to "disassembly instruc-
tions" Ref. No. 5).
5. Remove
the
clamp
plate, fixed plate, magnet
and
clamper (refer to "disassembly instructions" Ref. No.
10, 11).
6. Place the test disc
and secure it by using clamper
ass'y. (Refer to Fig. 1)
(refer to "disassembly Instructions" Ref. No. 11).
the test mode as follows:
EI keys (3 keys) on
'Clamper ass'y
Test
{hold the EJ
and set the
power switch to O!
8. Press the
key and play the test disc.
9. Follow the adjustment procedure.
(1) MECHANICAL ADJUSTMENT
1. Connect the oscilloscope's CH. 1 probe across
(VREF) on the servo P.C.B.
to Fig. 3 on page 27)
Oscilloscope setting: VOLT.
LASSER
TYAN
LAVA
WWW
OIE
200mV
SWEEP.
Sus.
Input coupling......
AC
2. Switch the player power ON, and play track 19 on the
test disc (SZZP1056C).
(Playing any other track will prevent the HEX screws
from being accessed.)
3. Leave the player in play mode and place it as shown
ig. 3.
4. Alternately adjust the two HEX screws with the
2.0mm allen wrench (SZZP1101C) until the vertical
fluctuation of RF signal is minimized and the eye
pattern is most stretched. (Refer to Fig. 2)
5. After completing the adjustment, lock the HEX
'screws with lock paint (RZZOLO1).
SL-PD687
(2) CHECK OF PLAY OPERATION AFTER
ADJUSTMENT
%* Checking Skip Search
| . Play an ordinary musical program disc.
%* Checking Playability
No
1. Play the 07mm black dat and the 0.2m
isc
(SZZP1056C) and verify that no sound
* Checking Manual Search
skip or noise 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).
Hole for mechanical adjustment
Hex screws
Note:
'The elevation angle can be adjusted
through this pot only after track 19
'on the SZZPIOS6C test disc has
been played.
(VREF)
Allen wrench
(SZZP1101C)
Fig. 3
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