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SL-PD647
SL-PD647
Mi MEASUREMENTS AND ADJUSTMENTS
Measuring Instruments and Special Tools
Allen wrench (M2.0) (SZZP1101C)
Allen wrench (M1.27)
0.9mm clearance gauge (RZZ0297)
Filter
Lock paint (RZZOL01)
Test discs
Playability test disc (SZZP1054C)
Uneven test disc (SZZP1056C)
Musical program disc (ordinary)
Dual-beam
oscilloscope with bandwidth
of 30MHz
or better (with EXT. trigger and 1:1 probe).
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PREPARATION
.
Remove
the cabinet
and front panel ass'y (refer to.
"disassembly instructions" Ref. No. 1, 2).
. Press
the play key and
when
the traverse
deck
reaches it's height position, set the power switch to
OFF.
. Remove.the tray ass'y (refer to "disassembly instruc-
tions" Ref. No. 3).
. Remove the clamp plate, yoke, magnet and clamper
(refer to "disassembly instructions" Ref. No. 8, 9).
(refer to "disassembly instructions" Ref. No. 9).
. Set the unit-in the test mode as follows:
(hold the FENg,
and
keys (3 keys) on
and set the power switch to ON.)
. Press the
key and play the test disc.
. Follow the adjustment procedure.
Clamper ass'y
Test disc
Power switch
| *
If you
have
replaced
the optical pickup,
spindle
motor, or turntable, do the following adjustment:
Clearance gauge
0.9mm
ree RZZ0297
)
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(1) TURNTABLE HEIGHT ADJUSTMENT
. Insert the 0.9mm clearance gauge (RZZ0297) between
the turntable and the loading base. (Refer to Fig. 2).
. Connect the oscilloscope's CH. 1 probe across
(+) and
(—) terminal via a filter (Refer to Fig. 3).
Note:
For the connection of oscilloscope's CH. 1 probe
to servo P.C.B. on foil side, refer to fig. 2.
Oscilloscope setting: VOLT
Ss
Probe
;
(Oscilloscope)
|
Input coupling
. Adjust oscilloscope's DC zero balance.
. Switch the play power ON, and play the test disc
(SZZP1054C).
. Measure the voltage amplitude of the signal on the
oscilloscope.
1G103
Servo P.C.B.
(AN8389SE1)
(Soldered surface)
Fig. 3
7. Adjust the height until the voltage is 0+1.0V.
If the voltage exceeds +1.0V, lower turntable.
If the voltage is below —1.0V, elevate the turn table. |
Note: Mesure the voltage as 0V as possible.
—
(2) MECHANICAL ADJUSTMENT
1. Connect
the
oscilloscope's
CH.
1 probe
across .
(8) BEST EYE (PD BALANCE) ADJUSTMENT FOR TYPE A
1.
(+) and
(GND) on the servo P.C.B.
(Refer to Fig. 1)
Oscilloscope setting: VOLT
Input coupling
. Switch the player power ON, and play track 7 on the
test disc (SZZP1056C).
(Playing any other track will prevent the HEX screws
from being accessed.)
. Leave the player in play mode and place it as shown |
Fig. 5.
. 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. 4)
. After
completing
the
adjustment,
lock
the
HEX
screws with lock paint (RZZOLO1).
Al en
wrenc
Range adjustable
with a allen wrench.
Fig. 5
Connect
the
oscilloscope's
CH.
1 probe
across
(+) and
(GND) on the servo P.C.B.
(Refer to Fig. 1)
Oscilloscope setting: VOLT
Input coupling
. Switch
the player power
ON, and
play the 1kHz
(track 1) on the test disc (SZZP1054C).
. Adjust
VR101
until the vertical
fluctuation
of RF
signal
is minimized
and
the eye
pattern
is most
stretched.
(Refer to Fig. 6)
CHECK OF PLAY OPERATION AFTER
ADJUSTMENT
Checking Skip Search
.
Play an ordinary musical program disc.
. Press the skip button to check for normal skip search
operation
(in both the forward'
and "reverse direc-
tions).
Checking Manual Search
. Play an ordinary musical program disc.
.
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).
ANY
NI
Mechanical
adjustment
screws.
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* Most stretched eye pattern.
Fig. 6
Checking Playability
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